--- layout: v2 title: Documentation bodyclass: api-page ---

## API Reference

This reference reflects Leaflet 0.7.x.

Docs for 1.0 are available here.

## Map

The central class of the API — it is used to create a map on a page and manipulate it.

### Usage example

    // initialize the map on the "map" div with a given center and zoom
    var map = L.map('map', {
    	center: [51.505, -0.09],
    	zoom: 13
    });

### Creation

Factory | Description
--- | ---
`L.map( <HTMLElement|String> id, <Map options> options? )` | Instantiates a map object given a div element (or its id) and optionally an object literal with map options described below.

### Options

#### Map State Options

Option | Type | Default | Description
--- | --- | --- | ---
`center` | `LatLng` | `null` | Initial geographical center of the map.
`zoom` | `Number` | `null` | Initial map zoom.
`layers` | `ILayer[]` | `null` | Layers that will be added to the map initially.
`minZoom` | `Number` | `null` | Minimum zoom level of the map. Overrides any `minZoom` set on map layers.
`maxZoom` | `Number` | `null` | Maximum zoom level of the map. This overrides any `maxZoom` set on map layers.
`maxBounds` | `LatLngBounds` | `null` | When this option is set, the map restricts the view to the given geographical bounds, bouncing the user back when he tries to pan outside the view. To set the restriction dynamically, use setMaxBounds method.
`crs` | `CRS` | `L.CRS. EPSG3857` | Coordinate Reference System to use. Don't change this if you're not sure what it means.

#### Interaction Options

Option | Type | Default | Description
--- | --- | --- | ---
`dragging` | `Boolean` | `true` | Whether the map be draggable with mouse/touch or not.
`touchZoom` | `Boolean` | `true` | Whether the map can be zoomed by touch-dragging with two fingers.
`scrollWheelZoom` | `Boolean` | `true` | Whether the map can be zoomed by using the mouse wheel. If passed `'center'`, it will zoom to the center of the view regardless of where the mouse was.
`doubleClickZoom` | `Boolean` | `true` | Whether the map can be zoomed in by double clicking on it and zoomed out by double clicking while holding shift. If passed `'center'`, double-click zoom will zoom to the center of the view regardless of where the mouse was.
`boxZoom` | `Boolean` | `true` | Whether the map can be zoomed to a rectangular area specified by dragging the mouse while pressing shift.
`tap` | `Boolean` | `true` | Enables mobile hacks for supporting instant taps (fixing 200ms click delay on iOS/Android) and touch holds (fired as `contextmenu` events).
`tapTolerance` | `Number` | `15` | The max number of pixels a user can shift his finger during touch for it to be considered a valid tap.
`trackResize` | `Boolean` | `true` | Whether the map automatically handles browser window resize to update itself.
`worldCopyJump` | `Boolean` | `false` | With this option enabled, the map tracks when you pan to another "copy" of the world and seamlessly jumps to the original one so that all overlays like markers and vector layers are still visible.
`closePopupOnClick` | `Boolean` | `true` | Set it to `false` if you don't want popups to close when user clicks the map.
`bounceAtZoomLimits` | `Boolean` | `true` | Set it to `false` if you don't want the map to zoom beyond min/max zoom and then bounce back when pinch-zooming.

#### Keyboard Navigation Options

Option | Type | Default | Description
--- | --- | --- | ---
`keyboard` | `Boolean` | `true` | Makes the map focusable and allows users to navigate the map with keyboard arrows and `+`/`-` keys.
`keyboardPanOffset` | `Number` | `80` | Amount of pixels to pan when pressing an arrow key.
`keyboardZoomOffset` | `Number` | `1` | Number of zoom levels to change when pressing `+` or `-` key.

#### Panning Inertia Options

Option | Type | Default | Description
--- | --- | --- | ---
`inertia` | `Boolean` | `true` | If enabled, panning of the map will have an inertia effect where the map builds momentum while dragging and continues moving in the same direction for some time. Feels especially nice on touch devices.
`inertiaDeceleration` | `Number` | `3000` | The rate with which the inertial movement slows down, in pixels/second2.
`inertiaMaxSpeed` | `Number` | `1500` | Max speed of the inertial movement, in pixels/second.
`inertiaThreshold` | `Number` | `depends` | Number of milliseconds that should pass between stopping the movement and releasing the mouse or touch to prevent inertial movement. `32` for touch devices and `14` for the rest by default.

#### Control options

Option | Type | Default | Description
--- | --- | --- | ---
`zoomControl` | `Boolean` | `true` | Whether the zoom control is added to the map by default.
`attributionControl` | `Boolean` | `true` | Whether the attribution control is added to the map by default.

#### Animation options

Option | Type | Default | Description
--- | --- | --- | ---
`fadeAnimation` | `Boolean` | depends | Whether the tile fade animation is enabled. By default it's enabled in all browsers that support CSS3 Transitions except Android.
`zoomAnimation` | `Boolean` | depends | Whether the tile zoom animation is enabled. By default it's enabled in all browsers that support CSS3 Transitions except Android.
`zoomAnimationThreshold` | `Number` | 4 | Won't animate zoom if the zoom difference exceeds this value.
`markerZoomAnimation` | `Boolean` | depends | Whether markers animate their zoom with the zoom animation, if disabled they will disappear for the length of the animation. By default it's enabled in all browsers that support CSS3 Transitions except Android.

### Events

You can subscribe to the following events using these methods.

Event | Data | Description
--- | --- | ---
`click` | `MouseEvent` | Fired when the user clicks (or taps) the map.
`dblclick` | `MouseEvent` | Fired when the user double-clicks (or double-taps) the map.
`mousedown` | `MouseEvent` | Fired when the user pushes the mouse button on the map.
`mouseup` | `MouseEvent` | Fired when the user releases the mouse button on the map.
`mouseover` | `MouseEvent` | Fired when the mouse enters the map.
`mouseout` | `MouseEvent` | Fired when the mouse leaves the map.
`mousemove` | `MouseEvent` | Fired while the mouse moves over the map.
`contextmenu` | `MouseEvent` | Fired when the user pushes the right mouse button on the map, prevents default browser context menu from showing if there are listeners on this event. Also fired on mobile when the user holds a single touch for a second (also called long press).
`focus` | `Event` | Fired when the user focuses the map either by tabbing to it or clicking/panning.
`blur` | `Event` | Fired when the map loses focus.
`preclick` | `MouseEvent` | Fired before mouse click on the map (sometimes useful when you want something to happen on click before any existing click handlers start running).
`load` | `Event` | Fired when the map is initialized (when its center and zoom are set for the first time).
`unload` | `Event` | Fired when the map is destroyed with remove method.
`viewreset` | `Event` | Fired when the map needs to redraw its content (this usually happens on map zoom or load). Very useful for creating custom overlays.
`movestart` | `Event` | Fired when the view of the map starts changing (e.g. user starts dragging the map).
`move` | `Event` | Fired on any movement of the map view.
`moveend` | `Event` | Fired when the view of the map stops changing (e.g. user stopped dragging the map).
`dragstart` | `Event` | Fired when the user starts dragging the map.
`drag` | `Event` | Fired repeatedly while the user drags the map.
`dragend` | `DragEndEvent` | Fired when the user stops dragging the map.
`zoomstart` | `Event` | Fired when the map zoom is about to change (e.g. before zoom animation).
`zoomend` | `Event` | Fired when the map zoom changes.
`zoomlevelschange` | `Event` | Fired when the number of zoomlevels on the map is changed due to adding or removing a layer.
`resize` | `ResizeEvent` | Fired when the map is resized.
`autopanstart` | `Event` | Fired when the map starts autopanning when opening a popup.
`layeradd` | `LayerEvent` | Fired when a new layer is added to the map.
`layerremove` | `LayerEvent` | Fired when some layer is removed from the map.
`baselayerchange` | `LayerEvent` | Fired when the base layer is changed through the layer control.
`overlayadd` | `LayerEvent` | Fired when an overlay is selected through the layer control.
`overlayremove` | `LayerEvent` | Fired when an overlay is deselected through the layer control.
`locationfound` | `LocationEvent` | Fired when geolocation (using the locate method) went successfully.
`locationerror` | `ErrorEvent` | Fired when geolocation (using the locate method) failed.
`popupopen` | `PopupEvent` | Fired when a popup is opened (using `openPopup` method).
`popupclose` | `PopupEvent` | Fired when a popup is closed (using `closePopup` method).

### Methods for Modifying Map State

Method | Returns | Description
--- | --- | ---
`setView( <LatLng> center, <Number> zoom?, <zoom/pan options> options? )` | `this` | Sets the view of the map (geographical center and zoom) with the given animation options.
`setZoom( <Number> zoom, <zoom options> options? )` | `this` | Sets the zoom of the map.
`zoomIn( <Number> delta?, <zoom options> options? )` | `this` | Increases the zoom of the map by `delta` (`1` by default).
`zoomOut( <Number> delta?, <zoom options> options? )` | `this` | Decreases the zoom of the map by `delta` (`1` by default).
`setZoomAround( <LatLng> latlng, <Number> zoom, <zoom options> options? )` | `this` | Zooms the map while keeping a specified point on the map stationary (e.g. used internally for scroll zoom and double-click zoom).
`fitBounds( <LatLngBounds> bounds, <fitBounds options> options? )` | `this` | Sets a map view that contains the given geographical bounds with the maximum zoom level possible.
`fitWorld( <fitBounds options> options? )` | `this` | Sets a map view that mostly contains the whole world with the maximum zoom level possible.
`panTo( <LatLng> latlng, <pan options> options? )` | `this` | Pans the map to a given center. Makes an animated pan if new center is not more than one screen away from the current one.
`panInsideBounds( <LatLngBounds> bounds, <pan options> options? )` | `this` | Pans the map to the closest view that would lie inside the given bounds (if it's not already), controlling the animation using the options specific, if any.
`panBy( <Point> point, <pan options> options? )` | `this` | Pans the map by a given number of pixels (animated).
`invalidateSize( <Boolean> animate )` | `this` | Checks if the map container size changed and updates the map if so — call it after you've changed the map size dynamically, also animating pan by default.
`invalidateSize( <zoom/pan options> options )` | `this` | Checks if the map container size changed and updates the map if so — call it after you've changed the map size dynamically, also animating pan by default. If `options.pan` is `false`, panning will not occur. If `options.debounceMoveend` is `true`, it will delay `moveend` event so that it doesn't happen often even if the method is called many times in a row.
`setMaxBounds( <LatLngBounds> bounds` | `this` | Restricts the map view to the given bounds (see map maxBounds option).
`locate( <Locate options> options? )` | `this` | Tries to locate the user using the Geolocation API, firing a `locationfound` event with location data on success or a `locationerror` event on failure, and optionally sets the map view to the user's location with respect to detection accuracy (or to the world view if geolocation failed). See Locate options for more details.
`stopLocate()` | `this` | Stops watching location previously initiated by `map.locate({watch: true})` and aborts resetting the map view if `map.locate` was called with `{setView: true}`.
`remove()` | `this` | Destroys the map and clears all related event listeners.

### Methods for Getting Map State

Method | Returns | Description
--- | --- | ---
`getCenter()` | `LatLng` | Returns the geographical center of the map view.
`getZoom()` | `Number` | Returns the current zoom of the map view.
`getMinZoom()` | `Number` | Returns the minimum zoom level of the map.
`getMaxZoom()` | `Number` | Returns the maximum zoom level of the map.
`getBounds()` | `LatLngBounds` | Returns the LatLngBounds of the current map view.
`getBoundsZoom( <LatLngBounds> bounds, <Boolean> inside? )` | `Number` | Returns the maximum zoom level on which the given bounds fit to the map view in its entirety. If `inside` (optional) is set to `true`, the method instead returns the minimum zoom level on which the map view fits into the given bounds in its entirety.
`getSize()` | `Point` | Returns the current size of the map container.
`getPixelBounds()` | `Bounds` | Returns the bounds of the current map view in projected pixel coordinates (sometimes useful in layer and overlay implementations).
`getPixelOrigin()` | `Point` | Returns the projected pixel coordinates of the top left point of the map layer (useful in custom layer and overlay implementations).

### Methods for Layers and Controls

Method | Returns | Description
--- | --- | ---
`addLayer( <ILayer> layer )` | `this` | Adds the given layer to the map.
`removeLayer( <ILayer> layer )` | `this` | Removes the given layer from the map.
`hasLayer( <ILayer> layer )` | `Boolean` | Returns `true` if the given layer is currently added to the map.
`eachLayer( <Function> fn, <Object> context? )` | `this` | Iterates over the layers of the map, optionally specifying context of the iterator function.
    map.eachLayer(function (layer) {
    	layer.bindPopup('Hello');
    });
`openPopup( <Popup> popup )` | `this` | Opens the specified popup while closing the previously opened (to make sure only one is opened at one time for usability).
`openPopup( <String> html | <HTMLElement> el, <LatLng> latlng, <Popup options> options? )` | `this` | Creates a popup with the specified options and opens it in the given point on a map.
`closePopup( <Popup> popup? )` | `this` | Closes the popup previously opened with openPopup (or the given one).
`addControl( <IControl> control )` | `this` | Adds the given control to the map.
`removeControl( <IControl> control )` | `this` | Removes the given control from the map.

### Conversion Methods

Method | Returns | Description
--- | --- | ---
`latLngToLayerPoint( <LatLng> latlng )` | `Point` | Returns the map layer point that corresponds to the given geographical coordinates (useful for placing overlays on the map).
`layerPointToLatLng( <Point> point )` | `LatLng` | Returns the geographical coordinates of a given map layer point.
`containerPointToLayerPoint( <Point> point )` | `Point` | Converts the point relative to the map container to a point relative to the map layer.
`layerPointToContainerPoint( <Point> point )` | `Point` | Converts the point relative to the map layer to a point relative to the map container.
`latLngToContainerPoint( <LatLng> latlng )` | `Point` | Returns the map container point that corresponds to the given geographical coordinates.
`containerPointToLatLng( <Point> point )` | `LatLng` | Returns the geographical coordinates of a given map container point.
`project( <LatLng> latlng, <Number> zoom? )` | `Point` | Projects the given geographical coordinates to absolute pixel coordinates for the given zoom level (current zoom level by default).
`unproject( <Point> point, <Number> zoom? )` | `LatLng` | Projects the given absolute pixel coordinates to geographical coordinates for the given zoom level (current zoom level by default).
`mouseEventToContainerPoint( <MouseEvent> event )` | `Point` | Returns the pixel coordinates of a mouse click (relative to the top left corner of the map) given its event object.
`mouseEventToLayerPoint( <MouseEvent> event )` | `Point` | Returns the pixel coordinates of a mouse click relative to the map layer given its event object.
`mouseEventToLatLng( <MouseEvent> event )` | `LatLng` | Returns the geographical coordinates of the point the mouse clicked on given the click's event object.

### Other Methods

Method | Returns | Description
--- | --- | ---
`getContainer()` | `HTMLElement` | Returns the container element of the map.
`getPanes()` | `MapPanes` | Returns an object with different map panes (to render overlays in).
`whenReady( <Function> fn, <Object> context? )` | `this` | Runs the given callback when the map gets initialized with a place and zoom, or immediately if it happened already, optionally passing a function context.

### Locate options

Option | Type | Default | Description
--- | --- | --- | ---
`watch` | `Boolean` | `false` | If `true`, starts continuous watching of location changes (instead of detecting it once) using W3C `watchPosition` method. You can later stop watching using `map.stopLocate()` method.
`setView` | `Boolean` | `false` | If `true`, automatically sets the map view to the user location with respect to detection accuracy, or to world view if geolocation failed.
`maxZoom` | `Number` | `Infinity` | The maximum zoom for automatic view setting when using `setView` option.
`timeout` | `Number` | `10000` | Number of milliseconds to wait for a response from geolocation before firing a `locationerror` event.
`maximumAge` | `Number` | `0` | Maximum age of detected location. If less than this amount of milliseconds passed since last geolocation response, `locate` will return a cached location.
`enableHighAccuracy` | `Boolean` | `false` | Enables high accuracy, see description in the W3C spec.

### Zoom/pan options

Option | Type | Default | Description
--- | --- | --- | ---
`reset` | `Boolean` | `false` | If `true`, the map view will be completely reset (without any animations).
`pan` | `pan options` | `-` | Sets the options for the panning (without the zoom change) if it occurs.
`zoom` | `zoom options` | `-` | Sets the options for the zoom change if it occurs.
`animate` | `Boolean` | `-` | An equivalent of passing `animate` to both zoom and pan options (see below).

### Pan options

Option | Type | Default | Description
--- | --- | --- | ---
`animate` | `Boolean` | `-` | If `true`, panning will always be animated if possible. If `false`, it will not animate panning, either resetting the map view if panning more than a screen away, or just setting a new offset for the map pane (except for `panBy` which always does the latter).
`duration` | `Number` | `0.25` | Duration of animated panning.
`easeLinearity` | `Number` | `0.25` | The curvature factor of panning animation easing (third parameter of the Cubic Bezier curve). 1.0 means linear animation, the less the more bowed the curve.
`noMoveStart` | `Boolean` | `false` | If `true`, panning won't fire `movestart` event on start (used internally for panning inertia).

### Zoom options

Option | Type | Default | Description
--- | --- | --- | ---
`animate` | `Boolean` | `-` | If not specified, zoom animation will happen if the zoom origin is inside the current view. If `true`, the map will attempt animating zoom disregarding where zoom origin is. Setting `false` will make it always reset the view completely without animation.

### fitBounds options

The same as zoom/pan options and additionally:

Option | Type | Default | Description
--- | --- | --- | ---
`paddingTopLeft` | `Point` | `[0, 0]` | Sets the amount of padding in the top left corner of a map container that shouldn't be accounted for when setting the view to fit bounds. Useful if you have some control overlays on the map like a sidebar and you don't want them to obscure objects you're zooming to.
`paddingBottomRight` | `Point` | `[0, 0]` | The same for bottom right corner of the map.
`padding` | `Point` | `[0, 0]` | Equivalent of setting both top left and bottom right padding to the same value.
`maxZoom` | `Number` | `null` | The maximum possible zoom to use.

### Properties

Map properties include interaction handlers that allow you to control interaction behavior in runtime, enabling or disabling certain features such as dragging or touch zoom (see IHandler methods). Example:

    map.doubleClickZoom.disable();

You can also access default map controls like attribution control through map properties:

    map.attributionControl.addAttribution("Earthquake data &copy; GeoNames");

Property | Type | Description
--- | --- | ---
`dragging` | `IHandler` | Map dragging handler (by both mouse and touch).
`touchZoom` | `IHandler` | Touch zoom handler.
`doubleClickZoom` | `IHandler` | Double click zoom handler.
`scrollWheelZoom` | `IHandler` | Scroll wheel zoom handler.
`boxZoom` | `IHandler` | Box (shift-drag with mouse) zoom handler.
`keyboard` | `IHandler` | Keyboard navigation handler.
`tap` | `IHandler` | Mobile touch hacks (quick tap and touch hold) handler.
`zoomControl` | `Control.Zoom` | Zoom control.
`attributionControl` | `Control.Attribution` | Attribution control.

### Map Panes

An object literal (returned by map.getPanes) that contains different map panes that you can use to put your custom overlays in. The difference is mostly in zIndex order that such overlays get.

Property | Type | Description
--- | --- | ---
`mapPane` | `HTMLElement` | Pane that contains all other map panes.
`tilePane` | `HTMLElement` | Pane for tile layers.
`objectsPane` | `HTMLElement` | Pane that contains all the panes except tile pane.
`shadowPane` | `HTMLElement` | Pane for overlay shadows (e.g. marker shadows).
`overlayPane` | `HTMLElement` | Pane for overlays like polylines and polygons.
`markerPane` | `HTMLElement` | Pane for marker icons.
`popupPane` | `HTMLElement` | Pane for popups.

## Marker

Used to put markers on the map.

    L.marker([50.5, 30.5]).addTo(map);

### Creation

Factory | Description
--- | ---
`L.marker( <LatLng> latlng, <Marker options> options? )` | Instantiates a Marker object given a geographical point and optionally an options object.

### Options

Option | Type | Default | Description
--- | --- | --- | ---
`icon` | `L.Icon` | * | Icon class to use for rendering the marker. See Icon documentation for details on how to customize the marker icon. Set to `new L.Icon.Default()` by default.
`clickable` | `Boolean` | `true` | If `false`, the marker will not emit mouse events and will act as a part of the underlying map.
`draggable` | `Boolean` | `false` | Whether the marker is draggable with mouse/touch or not.
`keyboard` | `Boolean` | `true` | Whether the marker can be tabbed to with a keyboard and clicked by pressing enter.
`title` | `String` | `''` | Text for the browser tooltip that appear on marker hover (no tooltip by default).
`alt` | `String` | `''` | Text for the `alt` attribute of the icon image (useful for accessibility).
`zIndexOffset` | `Number` | `0` | By default, zIndex for the marker image is set automatically based on its latitude. Use this option if you want to put the marker on top of all others (or below), specifying a high value like `1000` (or high negative value, respectively).
`opacity` | `Number` | `1.0` | The opacity of the marker.
`riseOnHover` | `Boolean` | `false` | If `true`, the marker will get on top of others when you hover the mouse over it.
`riseOffset` | `Number` | `250` | The z-index offset used for the `riseOnHover` feature.

### Events

You can subscribe to the following events using these methods.

Event | Data | Description
--- | --- | ---
`click` | `MouseEvent` | Fired when the user clicks (or taps) the marker.
`dblclick` | `MouseEvent` | Fired when the user double-clicks (or double-taps) the marker.
`mousedown` | `MouseEvent` | Fired when the user pushes the mouse button on the marker.
`mouseover` | `MouseEvent` | Fired when the mouse enters the marker.
`mouseout` | `MouseEvent` | Fired when the mouse leaves the marker.
`contextmenu` | `MouseEvent` | Fired when the user right-clicks on the marker.
`dragstart` | `Event` | Fired when the user starts dragging the marker.
`drag` | `Event` | Fired repeatedly while the user drags the marker.
`dragend` | `DragEndEvent` | Fired when the user stops dragging the marker.
`move` | `Event` | Fired when the marker is moved via setLatLng. New coordinate include in event arguments.
`add` | `Event` | Fired when the marker is added to the map.
`remove` | `Event` | Fired when the marker is removed from the map.
`popupopen` | `PopupEvent` | Fired when a popup bound to the marker is open.
`popupclose` | `PopupEvent` | Fired when a popup bound to the marker is closed.

### Methods

Method | Returns | Description
--- | --- | ---
`addTo( <Map> map )` | `this` | Adds the marker to the map.
`getLatLng()` | `LatLng` | Returns the current geographical position of the marker.
`setLatLng( <LatLng> latlng )` | `this` | Changes the marker position to the given point.
`setIcon( <Icon> icon )` | `this` | Changes the marker icon.
`setZIndexOffset( <Number> offset )` | `this` | Changes the zIndex offset of the marker.
`setOpacity( <Number> opacity )` | `this` | Changes the opacity of the marker.
`update()` | `this` | Updates the marker position, useful if coordinates of its `latLng` object were changed directly.
`bindPopup( <String> html | <HTMLElement> el | <Popup> popup, <Popup options> options? )` | `this` | Binds a popup with a particular HTML content to a click on this marker. You can also open the bound popup with the Marker openPopup method.
`unbindPopup()` | `this` | Unbinds the popup previously bound to the marker with `bindPopup`.
`openPopup()` | `this` | Opens the popup previously bound by the bindPopup method.
`getPopup()` | `Popup` | Returns the popup previously bound by the bindPopup method.
`closePopup()` | `this` | Closes the bound popup of the marker if it's opened.
`togglePopup()` | `this` | Toggles the popup previously bound by the bindPopup method.
`setPopupContent( <String> html | <HTMLElement> el )` | `this` | Sets an HTML content of the popup of this marker.
`toGeoJSON()` | `Object` | Returns a GeoJSON representation of the marker (GeoJSON Point Feature).

### Interaction handlers

Interaction handlers are properties of a marker instance that allow you to control interaction behavior in runtime, enabling or disabling certain features such as dragging (see IHandler methods). Example:

    marker.dragging.disable();

Property | Type | Description
--- | --- | ---
dragging | `IHandler` | Marker dragging handler (by both mouse and touch).

## Popup

Used to open popups in certain places of the map. Use Map#openPopup to open popups while making sure that only one popup is open at one time (recommended for usability), or use Map#addLayer to open as many as you want.

### Usage example

If you want to just bind a popup to marker click and then open it, it's really easy:

    marker.bindPopup(popupContent).openPopup();

Path overlays like polylines also have a `bindPopup` method. Here's a more complicated way to open a popup on a map:

    var popup = L.popup()
    	.setLatLng(latlng)
    	.setContent('<p>Hello world!<br />This is a nice popup.</p>')
    	.openOn(map);

### Creation

Factory | Description
--- | ---
`L.popup( <Popup options> options?, <ILayer> source? )` | Instantiates a Popup object given an optional options object that describes its appearance and location and an optional source object that is used to tag the popup with a reference to the ILayer to which it refers.

### Options

Option | Type | Default | Description
--- | --- | --- | ---
`maxWidth` | `Number` | `300` | Max width of the popup.
`minWidth` | `Number` | `50` | Min width of the popup.
`maxHeight` | `Number` | `null` | If set, creates a scrollable container of the given height inside a popup if its content exceeds it.
`autoPan` | `Boolean` | `true` | Set it to `false` if you don't want the map to do panning animation to fit the opened popup.
`keepInView` | `Boolean` | `false` | Set it to `true` if you want to prevent users from panning the popup off of the screen while it is open.
`closeButton` | `Boolean` | `true` | Controls the presence of a close button in the popup.
`offset` | `Point` | `Point(0, 6)` | The offset of the popup position. Useful to control the anchor of the popup when opening it on some overlays.
`autoPanPaddingTopLeft` | `Point` | `null` | The margin between the popup and the top left corner of the map view after autopanning was performed.
`autoPanPaddingBottomRight` | `Point` | `null` | The margin between the popup and the bottom right corner of the map view after autopanning was performed.
`autoPanPadding` | `Point` | `Point(5, 5)` | Equivalent of setting both top left and bottom right autopan padding to the same value.
`zoomAnimation` | `Boolean` | `true` | Whether to animate the popup on zoom. Disable it if you have problems with Flash content inside popups.
`closeOnClick` | `Boolean` | `null` | Set it to `false` if you want to override the default behavior of the popup closing when user clicks the map (set globally by the `Map` `closePopupOnClick` option).
`className` | `String` | `''` | A custom class name to assign to the popup.

### Methods

Method | Returns | Description
--- | --- | ---
`addTo( <Map> map )` | `this` | Adds the popup to the map.
`openOn( <Map> map )` | `this` | Adds the popup to the map and closes the previous one. The same as `map.openPopup(popup)`.
`setLatLng( <LatLng> latlng )` | `this` | Sets the geographical point where the popup will open.
`getLatLng()` | `LatLng` | Returns the geographical point of popup.
`setContent( <String|HTMLElement> htmlContent )` | `this` | Sets the HTML content of the popup.
`getContent()` | `<String|HTMLElement>` | Returns the content of the popup.
`update()` | `this` | Updates the popup content, layout and position. Useful for updating the popup after something inside changed, e.g. image loaded.

## TileLayer

Used to load and display tile layers on the map, implements ILayer interface.

### Usage example

    L.tileLayer('http://{s}.tile.osm.org/{z}/{x}/{y}.png?{foo}', {foo: 'bar'}).addTo(map);

### Creation

Factory | Description
--- | ---
`L.tileLayer( <String> urlTemplate, <TileLayer options> options? )` | Instantiates a tile layer object given a URL template and optionally an options object.

### URL template

A string of the following form:

    'http://{s}.somedomain.com/blabla/{z}/{x}/{y}.png'

`{s}` means one of the available subdomains (used sequentially to help with browser parallel requests per domain limitation; subdomain values are specified in options; `a`, `b` or `c` by default, can be omitted), `{z}` — zoom level, `{x}` and `{y}` — tile coordinates.

You can use custom keys in the template, which will be evaluated from TileLayer options, like this:

    L.tileLayer('http://{s}.somedomain.com/{foo}/{z}/{x}/{y}.png', {foo: 'bar'});

### Options

Option | Type | Default | Description
--- | --- | --- | ---
`minZoom` | `Number` | `0` | Minimum zoom number.
`maxZoom` | `Number` | `18` | Maximum zoom number.
`maxNativeZoom` | `Number` | `null` | Maximum zoom number the tiles source has available. If it is specified, the tiles on all zoom levels higher than `maxNativeZoom` will be loaded from `maxNativeZoom` level and auto-scaled.
`tileSize` | `Number` | `256` | Tile size (width and height in pixels, assuming tiles are square).
`subdomains` | `String` or `String[]` | `'abc'` | Subdomains of the tile service. Can be passed in the form of one string (where each letter is a subdomain name) or an array of strings.
`errorTileUrl` | `String` | `''` | URL to the tile image to show in place of the tile that failed to load.
`attribution` | `String` | `''` | e.g. "© Mapbox" — the string used by the attribution control, describes the layer data.
`tms` | `Boolean` | `false` | If `true`, inverses Y axis numbering for tiles (turn this on for TMS services).
`continuousWorld` | `Boolean` | `false` | If set to `true`, the tile coordinates won't be wrapped by world width (-180 to 180 longitude) or clamped to lie within world height (-90 to 90). Use this if you use Leaflet for maps that don't reflect the real world (e.g. game, indoor or photo maps).
`noWrap` | `Boolean` | `false` | If set to `true`, the tiles just won't load outside the world width (-180 to 180 longitude) instead of repeating.
`zoomOffset` | `Number` | `0` | The zoom number used in tile URLs will be offset with this value.
`zoomReverse` | `Boolean` | `false` | If set to `true`, the zoom number used in tile URLs will be reversed (`maxZoom - zoom` instead of `zoom`).
`opacity` | `Number` | `1.0` | The opacity of the tile layer.
`zIndex` | `Number` | `null` | The explicit zIndex of the tile layer. Not set by default.
`unloadInvisibleTiles` | `Boolean` | depends | If `true`, all the tiles that are not visible after panning are removed (for better performance). `true` by default on mobile WebKit, otherwise `false`.
`updateWhenIdle` | `Boolean` | depends | If `false`, new tiles are loaded during panning, otherwise only after it (for better performance). `true` by default on mobile WebKit, otherwise `false`.
`detectRetina` | ``Boolean`` | `false` | If `true` and user is on a retina display, it will request four tiles of half the specified size and a bigger zoom level in place of one to utilize the high resolution.
`reuseTiles` | ``Boolean`` | `false` | If `true`, all the tiles that are not visible after panning are placed in a reuse queue from which they will be fetched when new tiles become visible (as opposed to dynamically creating new ones). This will in theory keep memory usage low and eliminate the need for reserving new memory whenever a new tile is needed.
`bounds` | `LatLngBounds` | `null` | When this option is set, the TileLayer only loads tiles that are in the given geographical bounds.

### Events

You can subscribe to the following events using these methods.

Event | Data | Description
--- | --- | ---
`loading` | `Event` | Fired when the tile layer starts loading tiles.
`load` | `Event` | Fired when the tile layer loaded all visible tiles.
`tileloadstart` | `TileEvent` | Fired when a tile is requested and starts loading.
`tileload` | `TileEvent` | Fired when a tile loads.
`tileunload` | `TileEvent` | Fired when a tile is removed (e.g. when you have `unloadInvisibleTiles` on).
`tileerror` | `TileEvent` | Fired when there is an error loading a tile.

### Methods

Method | Returns | Description
--- | --- | ---
`addTo( <Map> map )` | `this` | Adds the layer to the map.
`bringToFront()` | `this` | Brings the tile layer to the top of all tile layers.
`bringToBack()` | `this` | Brings the tile layer to the bottom of all tile layers.
`setOpacity( <Number> opacity )` | `this` | Changes the opacity of the tile layer.
`setZIndex( <Number> zIndex )` | `this` | Sets the zIndex of the tile layer.
`redraw()` | `this` | Causes the layer to clear all the tiles and request them again.
`setUrl( <String> urlTemplate )` | `this` | Updates the layer's URL template and redraws it.
`getContainer()` | `HTMLElement` | Returns the HTML element that contains the tiles for this layer.

## TileLayer.WMS

Used to display WMS services as tile layers on the map. Extends TileLayer.

### Usage example

    var nexrad = L.tileLayer.wms("http://mesonet.agron.iastate.edu/cgi-bin/wms/nexrad/n0r.cgi", {
    	layers: 'nexrad-n0r-900913',
    	format: 'image/png',
    	transparent: true,
    	attribution: "Weather data © 2012 IEM Nexrad"
    });

### Creation

Factory | Description
--- | ---
`L.tileLayer.wms( <String> baseUrl, <TileLayer.WMS options> options )` | Instantiates a WMS tile layer object given a base URL of the WMS service and a WMS parameters/options object.

### Options

Includes all TileLayer options and additionally:

Option | Type | Default | Description
--- | --- | --- | ---
`layers` | `String` | `''` | (required) Comma-separated list of WMS layers to show.
`styles` | `String` | `''` | Comma-separated list of WMS styles.
`format` | `String` | `'image/jpeg'` | WMS image format (use `'image/png'` for layers with transparency).
`transparent` | `Boolean` | `false` | If `true`, the WMS service will return images with transparency.
`version` | `String` | `'1.1.1'` | Version of the WMS service to use.
`crs` | `CRS` | `null` | Coordinate Reference System to use for the WMS requests, defaults to map CRS. Don't change this if you're not sure what it means.

### Methods

Method | Returns | Description
--- | --- | ---
`setParams( <WMS parameters> params, <Boolean> noRedraw? )` | `this` | Merges an object with the new parameters and re-requests tiles on the current screen (unless `noRedraw` was set to `true`).

## TileLayer.Canvas

Used to create Canvas-based tile layers where tiles get drawn on the browser side. Extends TileLayer.

### Usage example

    var canvasTiles = L.tileLayer.canvas();

    canvasTiles.drawTile = function(canvas, tilePoint, zoom) {
    	var ctx = canvas.getContext('2d');
    	// draw something on the tile canvas
    }

### Creation

Factory | Description
--- | ---
`L.tileLayer.canvas( <TileLayer options> options? )` | Instantiates a Canvas tile layer object given an options object (optionally).

### Options

Option | Type | Default | Description
--- | --- | --- | ---
`async` | `Boolean` | `false` | Indicates that tiles will be drawn asynchronously. tileDrawn method should be called for each tile after drawing completion.

### Methods

Method | Returns | Description
--- | --- | ---
`drawTile( <HTMLCanvasElement> canvas, <Point> tilePoint, <Number> zoom )` | `this` | You need to define this method after creating the instance to draw tiles; `canvas` is the actual canvas tile on which you can draw, `tilePoint` represents the tile numbers, and `zoom` is the current zoom.
`tileDrawn( <HTMLCanvasElement> canvas )` | - | If `async` option is defined, this function should be called for each tile after drawing completion. `canvas` is the same canvas element, that was passed to drawTile.

## ImageOverlay

Used to load and display a single image over specific bounds of the map, implements ILayer interface.

### Usage example

    var imageUrl = 'http://www.lib.utexas.edu/maps/historical/newark_nj_1922.jpg',
    	imageBounds = [[40.712216, -74.22655], [40.773941, -74.12544]];

    L.imageOverlay(imageUrl, imageBounds).addTo(map);

### Creation

Factory | Description
--- | ---
`L.ImageOverlay( <String> imageUrl, <LatLngBounds> bounds, <ImageOverlay options> options? )` | Instantiates an image overlay object given the URL of the image and the geographical bounds it is tied to.

### Options

Option | Type | Default | Description
--- | --- | --- | ---
`opacity` | `Number` | `1.0` | The opacity of the image overlay.
`attribution` | `String` | `''` | The attribution text of the image overlay.

### Methods

Method | Returns | Description
--- | --- | ---
`addTo( <Map> map )` | `this` | Adds the overlay to the map.
`setOpacity( <Number> opacity )` | `this` | Sets the opacity of the overlay.
`setUrl( <String> imageUrl )` | `this` | Changes the URL of the image.
`bringToFront()` | `this` | Brings the layer to the top of all overlays.
`bringToBack()` | `this` | Brings the layer to the bottom of all overlays.

## Path

An abstract class that contains options and constants shared between vector overlays (Polygon, Polyline, Circle). Do not use it directly.

### Options

Option | Type | Default | Description
--- | --- | --- | ---
`stroke` | `Boolean` | `true` | Whether to draw stroke along the path. Set it to `false` to disable borders on polygons or circles.
`color` | `String` | `'#03f'` | Stroke color.
`weight` | `Number` | `5` | Stroke width in pixels.
`opacity` | `Number` | `0.5` | Stroke opacity.
`fill` | `Boolean` | depends | Whether to fill the path with color. Set it to `false` to disable filling on polygons or circles.
`fillColor` | `String` | same as color | Fill color.
`fillOpacity` | `Number` | `0.2` | Fill opacity.
`fillRule` | `String` | `'evenodd'` | A string that defines how the inside of a shape is determined.
`dashArray` | `String` | `null` | A string that defines the stroke dash pattern. Doesn't work on canvas-powered layers (e.g. Android 2).
`lineCap` | `String` | `null` | A string that defines shape to be used at the end of the stroke.
`lineJoin` | `String` | `null` | A string that defines shape to be used at the corners of the stroke.
`clickable` | `Boolean` | `true` | If `false`, the vector will not emit mouse events and will act as a part of the underlying map.
`pointerEvents` | `String` | `null` | Sets the `pointer-events` attribute on the path if SVG backend is used.
`className` | `String` | `''` | Custom class name set on an element.

### Events

You can subscribe to the following events using these methods.

Event | Data | Description
--- | --- | ---
`click` | `MouseEvent` | Fired when the user clicks (or taps) the object.
`dblclick` | `MouseEvent` | Fired when the user double-clicks (or double-taps) the object.
`mousedown` | `MouseEvent` | Fired when the user pushes the mouse button on the object.
`mouseover` | `MouseEvent` | Fired when the mouse enters the object.
`mouseout` | `MouseEvent` | Fired when the mouse leaves the object.
`contextmenu` | `MouseEvent` | Fired when the user pushes the right mouse button on the object, prevents default browser context menu from showing if there are listeners on this event.
`add` | `Event` | Fired when the path is added to the map.
`remove` | `Event` | Fired when the path is removed from the map.
`popupopen` | `PopupEvent` | Fired when a popup bound to the path is open.
`popupclose` | `PopupEvent` | Fired when a popup bound to the path is closed.

### Methods

Method | Returns | Description
--- | --- | ---
`addTo( <Map> map )` | `this` | Adds the layer to the map.
`bindPopup( <String> html | <HTMLElement> el | <Popup> popup, <Popup options> options? )` | `this` | Binds a popup with a particular HTML content to a click on this path.
`bindPopup( <Popup> popup, <Popup options> options? )` | `this` | Binds a given popup object to the path.
`unbindPopup()` | `this` | Unbinds the popup previously bound to the path with `bindPopup`.
`openPopup( <LatLng> latlng? )` | `this` | Opens the popup previously bound by the bindPopup method in the given point, or in one of the path's points if not specified.
`closePopup()` | `this` | Closes the path's bound popup if it is opened.
`setStyle( <Path options> object )` | `this` | Changes the appearance of a Path based on the options in the Path options object.
`getBounds()` | `LatLngBounds` | Returns the LatLngBounds of the path.
`bringToFront()` | `this` | Brings the layer to the top of all path layers.
`bringToBack()` | `this` | Brings the layer to the bottom of all path layers.
`redraw()` | `this` | Redraws the layer. Sometimes useful after you changed the coordinates that the path uses.

### Static properties

Constant | Type | Value | Description
--- | --- | --- | ---
`SVG` | `Boolean` | depends | True if SVG is used for vector rendering (true for most modern browsers).
`VML` | `Boolean` | depends | True if VML is used for vector rendering (IE 6-8).
`CANVAS` | `Boolean` | depends | True if Canvas is used for vector rendering (Android 2). You can also force this by setting global variable `L_PREFER_CANVAS` to `true` before the Leaflet include on your page — sometimes it can increase performance dramatically when rendering thousands of circle markers, but currently suffers from a bug that causes removing such layers to be extremely slow.
`CLIP_PADDING` | `Number` | `0.5` for SVG `0.02` for VML | How much to extend the clip area around the map view (relative to its size, e.g. 0.5 is half the screen in each direction). Smaller values mean that you will see clipped ends of paths while you're dragging the map, and bigger values decrease drawing performance.

## Polyline

A class for drawing polyline overlays on a map. Extends Path. Use Map#addLayer to add it to the map.

### Usage example

    // create a red polyline from an array of LatLng points
    var polyline = L.polyline(latlngs, {color: 'red'}).addTo(map);

    // zoom the map to the polyline
    map.fitBounds(polyline.getBounds());

### Creation

Factory | Description
--- | ---
`L.polyline( <LatLng[]> latlngs, <Polyline options> options? )` | Instantiates a polyline object given an array of geographical points and optionally an options object.

### Options

You can use Path options and additionally the following options:

Option | Type | Default | Description
--- | --- | --- | ---
`smoothFactor` | `Number` | `1.0` | How much to simplify the polyline on each zoom level. More means better performance and smoother look, and less means more accurate representation.
`noClip` | `Boolean` | `false` | Disabled polyline clipping.

### Methods

You can use Path methods and additionally the following methods:

Method | Returns | Description
--- | --- | ---
`addLatLng( <LatLng> latlng )` | `this` | Adds a given point to the polyline.
`setLatLngs( <LatLng[]> latlngs )` | `this` | Replaces all the points in the polyline with the given array of geographical points.
`getLatLngs()` | `LatLng[]` | Returns an array of the points in the path.
`spliceLatLngs( <Number> index, <Number> pointsToRemove, <LatLng> latlng?, … )` | `LatLng[]` | Allows adding, removing or replacing points in the polyline. Syntax is the same as in Array#splice. Returns the array of removed points (if any).
`getBounds()` | `LatLngBounds` | Returns the LatLngBounds of the polyline.
`toGeoJSON()` | `Object` | Returns a GeoJSON representation of the polyline (GeoJSON LineString Feature).

## MultiPolyline

Extends FeatureGroup to allow creating multi-polylines (single layer that consists of several polylines that share styling/popup).

### Creation

Factory | Description
--- | ---
`L.multiPolyline( <LatLng[][]> latlngs, <Polyline options> options? )` | Instantiates a multi-polyline object given an array of arrays of geographical points (one for each individual polyline) and optionally an options object.

### Methods

MultiPolylines accept all Polyline methods but have different behavior around their coordinate contents since they can contain multiple line features:

Method | Returns | Description
--- | --- | ---
`setLatLngs( <LatLng[][]> latlngs )` | `this` | Replace all lines and their paths with the given array of arrays of geographical points.
`getLatLngs()` | `<LatLng[][]> latlngs` | Returns an array of arrays of geographical points in each line.
`openPopup()` | `this` | Opens the popup previously bound by bindPopup.
`toGeoJSON()` | `Object` | Returns a GeoJSON representation of the multipolyline (GeoJSON MultiLineString Feature).

## Polygon

A class for drawing polygon overlays on a map. Extends Polyline. Use Map#addLayer to add it to the map.

Note that points you pass when creating a polygon shouldn't have an additional last point equal to the first one — it's better to filter out such points.

### Creation

Factory | Description
--- | ---
`L.polygon( <LatLng[]> latlngs, <Polyline options> options? )` | Instantiates a polygon object given an array of geographical points and optionally an options object (the same as for Polyline). You can also create a polygon with holes by passing an array of arrays of latlngs, with the first latlngs array representing the exterior ring while the remaining represent the holes inside.

### Methods

Polygon has the same options and methods as Polyline, with the following differences:

Method | Returns | Description
--- | --- | ---
`toGeoJSON()` | `Object` | Returns a GeoJSON representation of the polygon (GeoJSON Polygon Feature).

## MultiPolygon

Extends FeatureGroup to allow creating multi-polygons (single layer that consists of several polygons that share styling/popup).

### Creation

Factory | Description
--- | ---
`L.multiPolygon( <LatLng[][]> latlngs, <Polyline options> options? )` | Instantiates a multi-polygon object given an array of latlngs arrays (one for each individual polygon) and optionally an options object (the same as for MultiPolyline).

### Methods

MultiPolygons accept all Polyline methods but have different behavior around their coordinate contents since they can contain multiple polygon features:

Method | Returns | Description
--- | --- | ---
`setLatLngs( <LatLng[][]> latlngs )` | `this` | Replace all polygons and their paths with the given array of arrays of geographical points.
`getLatLngs()` | `<LatLng[][]> latlngs` | Returns an array of arrays of geographical points in each polygon.
`openPopup()` | `this` | Opens the popup previously bound by bindPopup.
`toGeoJSON()` | `Object` | Returns a GeoJSON representation of the multipolygon (GeoJSON MultiPolygon Feature).

## Rectangle

A class for drawing rectangle overlays on a map. Extends Polygon. Use Map#addLayer to add it to the map.

### Usage example

    // define rectangle geographical bounds
    var bounds = [[54.559322, -5.767822], [56.1210604, -3.021240]];

    // create an orange rectangle
    L.rectangle(bounds, {color: "#ff7800", weight: 1}).addTo(map);

    // zoom the map to the rectangle bounds
    map.fitBounds(bounds);

### Creation

Factory | Description
--- | ---
`L.rectangle( <LatLngBounds> bounds, <Path options> options? )` | Instantiates a rectangle object with the given geographical bounds and optionally an options object.

### Methods

You can use Path methods and additionally the following methods:

Method | Returns | Description
--- | --- | ---
`setBounds( <LatLngBounds> bounds )` | `this` | Redraws the rectangle with the passed bounds.

## Circle

A class for drawing circle overlays on a map. Extends Path. Use Map#addLayer to add it to the map.

    L.circle([50.5, 30.5], 200).addTo(map);

### Creation

Factory | Description
--- | ---
`L.circle( <LatLng> latlng, <Number> radius, <Path options> options? )` | Instantiates a circle object given a geographical point, a radius in meters and optionally an options object.

### Methods

Method | Returns | Description
--- | --- | ---
`getLatLng()` | `LatLng` | Returns the current geographical position of the circle.
`getRadius()` | `Number` | Returns the current radius of a circle. Units are in meters.
`setLatLng( <LatLng> latlng )` | `this` | Sets the position of a circle to a new location.
`setRadius( <Number> radius )` | `this` | Sets the radius of a circle. Units are in meters.
`toGeoJSON()` | `Object` | Returns a GeoJSON representation of the circle (GeoJSON Point Feature).

## CircleMarker

A circle of a fixed size with radius specified in pixels. Extends Circle. Use Map#addLayer to add it to the map.

### Creation

Factory | Description
--- | ---
`L.circleMarker( <LatLng> latlng, <Path options> options? )` | Instantiates a circle marker given a geographical point and optionally an options object. The default radius is 10 and can be altered by passing a "radius" member in the path options object.

### Methods

Method | Returns | Description
--- | --- | ---
`setLatLng( <LatLng> latlng )` | `this` | Sets the position of a circle marker to a new location.
`setRadius( <Number> radius )` | `this` | Sets the radius of a circle marker. Units are in pixels.
`toGeoJSON()` | `Object` | Returns a GeoJSON representation of the circle marker (GeoJSON Point Feature).

## LayerGroup

Used to group several layers and handle them as one. If you add it to the map, any layers added or removed from the group will be added/removed on the map as well. Implements ILayer interface.

    L.layerGroup([marker1, marker2])
    	.addLayer(polyline)
    	.addTo(map);

### Creation

Factory | Description
--- | ---
`L.layerGroup( <ILayer[]> layers? )` | Create a layer group, optionally given an initial set of layers.

### Methods

Method | Returns | Description
--- | --- | ---
`addTo( <Map> map )` | `this` | Adds the group of layers to the map.
`addLayer( <ILayer> layer )` | `this` | Adds a given layer to the group.
`removeLayer( <ILayer> layer )` | `this` | Removes a given layer from the group.
`removeLayer( <String> id )` | `this` | Removes a given layer of the given id from the group.
`hasLayer( <ILayer> layer )` | `Boolean` | Returns `true` if the given layer is currently added to the group.
`getLayer( <String> id )` | `ILayer` | Returns the layer with the given id.
`getLayers()` | `Array` | Returns an array of all the layers added to the group.
`clearLayers()` | `this` | Removes all the layers from the group.
`eachLayer( <Function> fn, <Object> context? )` | `this` | Iterates over the layers of the group, optionally specifying context of the iterator function.
    group.eachLayer(function (layer) {
    	layer.bindPopup('Hello');
    });
`toGeoJSON()` | `Object` | Returns a GeoJSON representation of the layer group (GeoJSON FeatureCollection).

## FeatureGroup

Extended layerGroup that also has mouse events (propagated from members of the group) and a shared bindPopup method. Implements ILayer interface.

    L.featureGroup([marker1, marker2, polyline])
    	.bindPopup('Hello world!')
    	.on('click', function() { alert('Clicked on a group!'); })
    	.addTo(map);

### Creation

Factory | Description
--- | ---
`L.featureGroup( <ILayer[]> layers? )` | Create a layer group, optionally given an initial set of layers.

### Methods

Has all layerGroup methods and additionally:

Method | Returns | Description
--- | --- | ---
`bindPopup( <String> htmlContent, <Popup options> options? )` | `this` | Binds a popup with a particular HTML content to a click on any layer from the group that has a `bindPopup` method.
`getBounds()` | `LatLngBounds` | Returns the LatLngBounds of the Feature Group (created from bounds and coordinates of its children).
`setStyle( <Path options> style )` | `this` | Sets the given path options to each layer of the group that has a `setStyle` method.
`bringToFront()` | `this` | Brings the layer group to the top of all other layers.
`bringToBack()` | `this` | Brings the layer group to the bottom of all other layers.

### Events

You can subscribe to the following events using these methods.

Event | Data | Description
--- | --- | ---
`click` | `MouseEvent` | Fired when the user clicks (or taps) the group.
`dblclick` | `MouseEvent` | Fired when the user double-clicks (or double-taps) the group.
`mouseover` | `MouseEvent` | Fired when the mouse enters the group.
`mouseout` | `MouseEvent` | Fired when the mouse leaves the group.
`mousemove` | `MouseEvent` | Fired while the mouse moves over the layers of the group.
`contextmenu` | `MouseEvent` | Fired when the user right-clicks on one of the layers.
`layeradd` | `LayerEvent` | Fired when a layer is added to the group.
`layerremove` | `LayerEvent` | Fired when a layer is removed from the map.

## GeoJson

Represents a GeoJSON object or an array of GeoJSON objects. Allows you to parse GeoJSON data and display it on the map. Extends FeatureGroup.

    L.geoJson(data, {
    	style: function (feature) {
    		return {color: feature.properties.color};
    	},
    	onEachFeature: function (feature, layer) {
    		layer.bindPopup(feature.properties.description);
    	}
    }).addTo(map);

Each feature layer created by it gets a `feature` property that links to the GeoJSON feature data the layer was created from (so that you can access its properties later).

### Creation

Factory | Description
--- | ---
`L.geoJson( <Object> geojson?, <GeoJSON options> options? )` | Creates a GeoJSON layer. Optionally accepts an object in GeoJSON format to display on the map (you can alternatively add it later with `addData` method) and an options object.

### Options

Option | Description
--- | ---
`pointToLayer( <GeoJSON> featureData, <LatLng> latlng )` | Function that will be used for creating layers for GeoJSON points (if not specified, simple markers will be created).
`style( <GeoJSON> featureData )` | Function that will be used to get style options for vector layers created for GeoJSON features.
`onEachFeature( <GeoJSON> featureData, <ILayer> layer )` | Function that will be called on each created feature layer. Useful for attaching events and popups to features.
`filter( <GeoJSON> featureData, <ILayer> layer )` | Function that will be used to decide whether to show a feature or not.
`coordsToLatLng( <Array> coords )` | Function that will be used for converting GeoJSON coordinates to LatLng points (if not specified, coords will be assumed to be WGS84 — standard `[longitude, latitude]` values in degrees).

Additionally accepts all Path options for polylines and polygons.

### Methods

Method | Returns | Description
--- | --- | ---
`addData( <GeoJSON> data )` | `this` | Adds a GeoJSON object to the layer.
`setStyle( <Function> style )` | `this` | Changes styles of GeoJSON vector layers with the given style function.
`resetStyle( <Path> layer )` | `this` | Resets the given vector layer's style to the original GeoJSON style, useful for resetting style after hover events.

### Static methods

Method | Returns | Description
--- | --- | ---
`geometryToLayer( <GeoJSON> featureData, <Function> pointToLayer? )` | `ILayer` | Creates a layer from a given GeoJSON feature.
`coordsToLatLng( <Array> coords, <Boolean> reverse? )` | `LatLng` | Creates a LatLng object from an array of 2 numbers (latitude, longitude) used in GeoJSON for points. If `reverse` is set to `true`, the numbers will be interpreted as (longitude, latitude).
`coordsToLatLngs( <Array> coords, <Number> levelsDeep?, <Boolean> reverse? )` | `Array` | Creates a multidimensional array of LatLng objects from a GeoJSON coordinates array. `levelsDeep` specifies the nesting level (0 is for an array of points, 1 for an array of arrays of points, etc., 0 by default). If `reverse` is set to `true`, the numbers will be interpreted as (longitude, latitude).

## LatLng

Represents a geographical point with a certain latitude and longitude.

    var latlng = L.latLng(50.5, 30.5);

All Leaflet methods that accept LatLng objects also accept them in a simple Array form and simple object form (unless noted otherwise), so these lines are equivalent:

    map.panTo([50, 30]);
    map.panTo({lon: 30, lat: 50});
    map.panTo({lat: 50, lng: 30});
    map.panTo(L.latLng(50, 30));

### Creation

Factory | Description
--- | ---
`L.latLng( <Number> latitude, <Number> longitude, <Number> altitude? )` | Creates an object representing a geographical point with the given latitude and longitude (and optionally altitude).

### Properties

Property | Type | Description
--- | --- | ---
`lat` | `Number` | Latitude in degrees.
`lng` | `Number` | Longitude in degrees.

### Methods

Method | Returns | Description
--- | --- | ---
`distanceTo( <LatLng> otherLatlng )` | `Number` | Returns the distance (in meters) to the given LatLng calculated using the Haversine formula. See description on wikipedia.
`equals( <LatLng> otherLatlng )` | `Boolean` | Returns `true` if the given LatLng point is at the same position (within a small margin of error).
`toString()` | `String` | Returns a string representation of the point (for debugging purposes).
`wrap( <Number> left, <Number> right )` | `LatLng` | Returns a new `LatLng` object with the longitude wrapped around `left` and `right` boundaries (`-180` to `180` by default).

### Constants

Constant | Type | Value | Description
--- | --- | --- | ---
`DEG_TO_RAD` | `Number` | `Math.PI / 180` | A multiplier for converting degrees into radians.
`RAD_TO_DEG` | `Number` | `180 / Math.PI` | A multiplier for converting radians into degrees.
`MAX_MARGIN` | `Number` | `1.0E-9` | Max margin of error for the equality check.

## LatLngBounds

Represents a rectangular geographical area on a map.

    var southWest = L.latLng(40.712, -74.227),
    	northEast = L.latLng(40.774, -74.125),
    	bounds = L.latLngBounds(southWest, northEast);

All Leaflet methods that accept LatLngBounds objects also accept them in a simple Array form (unless noted otherwise), so the bounds example above can be passed like this:

    map.fitBounds([
    	[40.712, -74.227],
    	[40.774, -74.125]
    ]);

### Creation

Factory | Description
--- | ---
`L.latLngBounds( <LatLng> southWest, <LatLng> northEast )` | Creates a latLngBounds object by defining south-west and north-east corners of the rectangle.
`L.latLngBounds( <LatLng[]> latlngs )` | Creates a LatLngBounds object defined by the geographical points it contains. Very useful for zooming the map to fit a particular set of locations with fitBounds.

### Methods

Method | Returns | Description
--- | --- | ---
`extend( <LatLng|LatLngBounds> latlng )` | `this` | Extends the bounds to contain the given point or bounds.
`getSouthWest()` | `LatLng` | Returns the south-west point of the bounds.
`getNorthEast()` | `LatLng` | Returns the north-east point of the bounds.
`getNorthWest()` | `LatLng` | Returns the north-west point of the bounds.
`getSouthEast()` | `LatLng` | Returns the south-east point of the bounds.
`getWest()` | `Number` | Returns the west longitude of the bounds.
`getSouth()` | `Number` | Returns the south latitude of the bounds.
`getEast()` | `Number` | Returns the east longitude of the bounds.
`getNorth()` | `Number` | Returns the north latitude of the bounds.
`getCenter()` | `LatLng` | Returns the center point of the bounds.
`contains( <LatLngBounds> otherBounds )` | `Boolean` | Returns `true` if the rectangle contains the given one.
`contains( <LatLng> latlng )` | `Boolean` | Returns `true` if the rectangle contains the given point.
`intersects( <LatLngBounds> otherBounds )` | `Boolean` | Returns `true` if the rectangle intersects the given bounds.
`equals( <LatLngBounds> otherBounds )` | `Boolean` | Returns `true` if the rectangle is equivalent (within a small margin of error) to the given bounds.
`toBBoxString()` | `String` | Returns a string with bounding box coordinates in a `'southwest_lng,southwest_lat,northeast_lng,northeast_lat'` format. Useful for sending requests to web services that return geo data.
`pad( <Number> bufferRatio )` | `LatLngBounds` | Returns bigger bounds created by extending the current bounds by a given percentage in each direction.
`isValid()` | `Boolean` | Returns `true` if the bounds are properly initialized.

## Point

Represents a point with x and y coordinates in pixels.

    var point = L.point(200, 300);

All Leaflet methods and options that accept Point objects also accept them in a simple Array form (unless noted otherwise), so these lines are equivalent:

    map.panBy([200, 300]);
    map.panBy(L.point(200, 300));

### Creation

Factory | Description
--- | ---
`L.point( <Number> x, <Number> y, <Boolean> round? )` | Creates a Point object with the given `x` and `y` coordinates. If optional `round` is set to `true`, rounds the `x` and `y` values.

### Properties

Property | Type | Description
--- | --- | ---
`x` | `Number` | The x coordinate.
`y` | `Number` | The y coordinate.

### Methods

Method | Returns | Description
--- | --- | ---
`add( <Point> otherPoint )` | `Point` | Returns the result of addition of the current and the given points.
`subtract( <Point> otherPoint )` | `Point` | Returns the result of subtraction of the given point from the current.
`multiplyBy( <Number> number )` | `Point` | Returns the result of multiplication of the current point by the given number.
`divideBy( <Number> number, <Boolean> round? )` | `Point` | Returns the result of division of the current point by the given number. If optional `round` is set to `true`, returns a rounded result.
`distanceTo( <Point> otherPoint )` | `Number` | Returns the distance between the current and the given points.
`clone()` | `Point` | Returns a copy of the current point.
`round()` | `Point` | Returns a copy of the current point with rounded coordinates.
`floor()` | `Point` | Returns a copy of the current point with floored coordinates (rounded down).
`equals( <Point> otherPoint )` | `Boolean` | Returns `true` if the given point has the same coordinates.
`contains( <Point> otherPoint )` | `Boolean` | Returns `true` if the both coordinates of the given point are less than the corresponding current point coordinates (in absolute values).
`toString()` | `String` | Returns a string representation of the point for debugging purposes.

## Bounds

Represents a rectangular area in pixel coordinates.

    var p1 = L.point(10, 10),
    	p2 = L.point(40, 60),
    	bounds = L.bounds(p1, p2);

All Leaflet methods that accept Bounds objects also accept them in a simple Array form (unless noted otherwise), so the bounds example above can be passed like this:

    otherBounds.intersects([[10, 10], [40, 60]]);

### Creation

Factory | Description
--- | ---
`L.bounds( <Point> topLeft, <Point> bottomRight )` | Creates a Bounds object from two coordinates (usually top-left and bottom-right corners).
`L.bounds( <Point[]> points )` | Creates a Bounds object defined by the points it contains.

### Properties

Property | Type | Description
--- | --- | ---
`min` | `Point` | The top left corner of the rectangle.
`max` | `Point` | The bottom right corner of the rectangle.

### Methods

Method | Returns | Description
--- | --- | ---
`extend( <Point> point )` | - | Extends the bounds to contain the given point.
`getCenter()` | `Point` | Returns the center point of the bounds.
`contains( <Bounds> otherBounds )` | `Boolean` | Returns `true` if the rectangle contains the given one.
`contains( <Point> point )` | `Boolean` | Returns `true` if the rectangle contains the given point.
`intersects( <Bounds> otherBounds )` | `Boolean` | Returns `true` if the rectangle intersects the given bounds.
`isValid()` | `Boolean` | Returns `true` if the bounds are properly initialized.
`getSize()` | `Point` | Returns the size of the given bounds.

## Icon

Represents an icon to provide when creating a marker.

    var myIcon = L.icon({
    	iconUrl: 'my-icon.png',
    	iconRetinaUrl: 'my-icon@2x.png',
    	iconSize: [38, 95],
    	iconAnchor: [22, 94],
    	popupAnchor: [-3, -76],
    	shadowUrl: 'my-icon-shadow.png',
    	shadowRetinaUrl: 'my-icon-shadow@2x.png',
    	shadowSize: [68, 95],
    	shadowAnchor: [22, 94]
    });

    L.marker([50.505, 30.57], {icon: myIcon}).addTo(map);

`L.Icon.Default` extends `L.Icon` and is the blue icon Leaflet uses for markers by default.

### Creation

Factory | Description
--- | ---
`L.icon( <Icon options> options )` | Creates an icon instance with the given options.

### Options

Option | Type | Description
--- | --- | ---
`iconUrl` | `String` | (required) The URL to the icon image (absolute or relative to your script path).
`iconRetinaUrl` | `String` | The URL to a retina sized version of the icon image (absolute or relative to your script path). Used for Retina screen devices.
`iconSize` | `Point` | Size of the icon image in pixels.
`iconAnchor` | `Point` | The coordinates of the "tip" of the icon (relative to its top left corner). The icon will be aligned so that this point is at the marker's geographical location. Centered by default if size is specified, also can be set in CSS with negative margins.
`shadowUrl` | `String` | The URL to the icon shadow image. If not specified, no shadow image will be created.
`shadowRetinaUrl` | `String` | The URL to the retina sized version of the icon shadow image. If not specified, no shadow image will be created. Used for Retina screen devices.
`shadowSize` | `Point` | Size of the shadow image in pixels.
`shadowAnchor` | `Point` | The coordinates of the "tip" of the shadow (relative to its top left corner) (the same as `iconAnchor` if not specified).
`popupAnchor` | `Point` | The coordinates of the point from which popups will "open", relative to the icon anchor.
`className` | `String` | A custom class name to assign to both icon and shadow images. Empty by default.

## DivIcon

Represents a lightweight icon for markers that uses a simple `div` element instead of an image.

    var myIcon = L.divIcon({className: 'my-div-icon'});
    // you can set .my-div-icon styles in CSS

    L.marker([50.505, 30.57], {icon: myIcon}).addTo(map);

By default, it has a `'leaflet-div-icon'` class and is styled as a little white square with a shadow.

### Creation

Factory | Description
--- | ---
`L.divIcon( <DivIcon options> options )` | Creates a div icon instance with the given options.

### Options

Option | Type | Description
--- | --- | ---
`iconSize` | `Point` | Size of the icon in pixels. Can be also set through CSS.
`iconAnchor` | `Point` | The coordinates of the "tip" of the icon (relative to its top left corner). The icon will be aligned so that this point is at the marker's geographical location. Centered by default if size is specified, also can be set in CSS with negative margins.
`popupAnchor` | `Point` | The coordinates of the point from which popups will "open", relative to the icon anchor.
`className` | `String` | A custom class name to assign to the icon. `'leaflet-div-icon'` by default.
`html` | `String` | A custom HTML code to put inside the div element, empty by default.

## Control

The base class for all Leaflet controls. Implements IControl interface. You can add controls to the map like this:

    control.addTo(map);
    // the same as
    map.addControl(control);

### Creation

Factory | Description
--- | ---
`L.control( <Control options> options? )` | Creates a control with the given options.

### Options

Option | Type | Default | Description
--- | --- | --- | ---
`position` | `String` | `'topright'` | The initial position of the control (one of the map corners). See control positions.

### Methods

Method | Returns | Description
--- | --- | ---
`setPosition( <String> position )` | `this` | Sets the position of the control. See control positions.
`getPosition()` | `String` | Returns the current position of the control.
`addTo( <Map> map )` | `this` | Adds the control to the map.
`removeFrom( <Map> map )` | `this` | Removes the control from the map.
`getContainer()` | `HTMLElement` | Returns the HTML container of the control.

### Control Positions

Control positions (map corner to put a control to) are set using strings. Margins between controls and the map border are set with CSS, so that you can easily override them.

Position | Description
--- | ---
`'topleft'` | Top left of the map.
`'topright'` | Top right of the map.
`'bottomleft'` | Bottom left of the map.
`'bottomright'` | Bottom right of the map.

## Control.zoom

A basic zoom control with two buttons (zoom in and zoom out). It is put on the map by default unless you set its `zoomControl` option to `false`. Extends Control.

### Creation

Factory | Description
--- | ---
`L.control.zoom( <Control.Zoom options> options? )` | Creates a zoom control.

### Options

Option | Type | Default | Description
--- | --- | --- | ---
`position` | `String` | `'topleft'` | The position of the control (one of the map corners). See control positions.
`zoomInText` | `String` | `'+'` | The text set on the zoom in button.
`zoomOutText` | `String` | `'-'` | The text set on the zoom out button.
`zoomInTitle` | `String` | `'Zoom in'` | The title set on the zoom in button.
`zoomOutTitle` | `String` | `'Zoom out'` | The title set on the zoom out button.

## Control.Attribution

The attribution control allows you to display attribution data in a small text box on a map. It is put on the map by default unless you set its `attributionControl` option to `false`, and it fetches attribution texts from layers with `getAttribution` method automatically. Extends Control.

### Creation

Factory | Description
--- | ---
`L.control.attribution( <Control.Attribution options> options? )` | Creates an attribution control.

### Options

Option | Type | Default | Description
--- | --- | --- | ---
`position` | `String` | `'bottomright'` | The position of the control (one of the map corners). See control positions.
`prefix` | `String` | `'Leaflet'` | The HTML text shown before the attributions. Pass `false` to disable.

### Methods

Method | Returns | Description
--- | --- | ---
`setPrefix( <String> prefix )` | `this` | Sets the text before the attributions.
`addAttribution( <String> text )` | `this` | Adds an attribution text (e.g. `'Vector data &copy; Mapbox'`).
`removeAttribution( <String> text )` | `this` | Removes an attribution text.

## Control.Layers

The layers control gives users the ability to switch between different base layers and switch overlays on/off (check out the detailed example). Extends Control.

    var baseLayers = {
    	"Mapbox": mapbox,
    	"OpenStreetMap": osm
    };

    var overlays = {
    	"Marker": marker,
    	"Roads": roadsLayer
    };

    L.control.layers(baseLayers, overlays).addTo(map);

### Creation

Factory | Description
--- | ---
`L.control.layers( <Layer Config> baseLayers?, <Layer Config> overlays?, <Control.Layers options> options? )` | Creates an attribution control with the given layers. Base layers will be switched with radio buttons, while overlays will be switched with checkboxes. Note that all base layers should be passed in the base layers object, but only one should be added to the map during map instantiation.

### Methods

Method | Returns | Description
--- | --- | ---
`addBaseLayer( <ILayer> layer, <String> name )` | `this` | Adds a base layer (radio button entry) with the given name to the control.
`addOverlay( <ILayer> layer, <String> name )` | `this` | Adds an overlay (checkbox entry) with the given name to the control.
`removeLayer( <ILayer> layer )` | `this` | Remove the given layer from the control.

### Options

Option | Type | Default | Description
--- | --- | --- | ---
`position` | `String` | `'topright'` | The position of the control (one of the map corners). See control positions.
`collapsed` | `Boolean` | `true` | If `true`, the control will be collapsed into an icon and expanded on mouse hover or touch.
`autoZIndex` | `Boolean` | `true` | If `true`, the control will assign zIndexes in increasing order to all of its layers so that the order is preserved when switching them on/off.

### Layer Config

An object literal with layer names as keys and layer objects as values:

    {
    	"<someName1>": layer1,
    	"<someName2>": layer2
    }

The layer names can contain HTML, which allows you to add additional styling to the items:

    {"<img src='my-layer-icon' /> <span class='my-layer-item'>My Layer</span>": myLayer}

### Events

You can subscribe to the following events on the Map object using these methods.

Event | Data | Description
--- | --- | ---
`baselayerchange` | `LayersControlEvent` | Fired when the base layer is changed through the control.
`overlayadd` | `LayersControlEvent` | Fired when an overlay is selected through the control.
`overlayremove` | `LayersControlEvent` | Fired when an overlay is deselected through the control.

## Control.Scale

A simple scale control that shows the scale of the current center of screen in metric (m/km) and imperial (mi/ft) systems. Extends Control.

    L.control.scale().addTo(map);

### Creation

Factory | Description
--- | ---
`L.control.scale( <Control.Scale options> options? )` | Creates an scale control with the given options.

### Options

Option | Type | Default | Description
--- | --- | --- | ---
`position` | `String` | `'bottomleft'` | The position of the control (one of the map corners). See control positions.
`maxWidth` | `Number` | `100` | Maximum width of the control in pixels. The width is set dynamically to show round values (e.g. 100, 200, 500).
`metric` | `Boolean` | `true` | Whether to show the metric scale line (m/km).
`imperial` | `Boolean` | `true` | Whether to show the imperial scale line (mi/ft).
`updateWhenIdle` | `Boolean` | `false` | If `true`, the control is updated on `moveend`, otherwise it's always up-to-date (updated on `move`).

## Events methods

A set of methods shared between event-powered classes (like Map). Generally, events allow you to execute some function when something happens with an object (e.g. the user clicks on the map, causing the map `'click'` event).

### Example

    map.on('click', function(e) {
    	alert(e.latlng);
    });

Leaflet deals with event listeners by reference, so if you want to add a listener and then remove it, define it as a function:

    function onClick(e) { ... }

    map.on('click', onClick);
    map.off('click', onClick);

### Methods

Method | Returns | Description
--- | --- | ---
`addEventListener( <String> type, <Function> fn, <Object> context? )` | `this` | Adds a listener function (`fn`) to a particular event type of the object. You can optionally specify the context of the listener (object the `this` keyword will point to). You can also pass several space-separated types (e.g. `'click dblclick'`).
`addOneTimeEventListener( <String> type, <Function> fn, <Object> context? )` | `this` | The same as above except the listener will only get fired once and then removed.
`addEventListener( <Object> eventMap, <Object> context? )` | `this` | Adds a set of type/listener pairs, e.g. `{click: onClick, mousemove: onMouseMove}`
`removeEventListener( <String> type, <Function> fn?, <Object> context? )` | `this` | Removes a previously added listener function. If no function is specified, it will remove all the listeners of that particular event from the object. Note that if you passed a custom context to `addEventListener`, you must pass the same context to `removeEventListener` in order to remove the listener.
`removeEventListener( <Object> eventMap, <Object> context? )` | `this` | Removes a set of type/listener pairs.
`removeEventListener()` | `this` | Removes all listeners. An alias to `clearAllEventListeners` when you use it without arguments.
`hasEventListeners( <String> type )` | `Boolean` | Returns `true` if a particular event type has some listeners attached to it.
`fireEvent( <String> type, <Object> data? )` | `this` | Fires an event of the specified type. You can optionally provide an data object — the first argument of the listener function will contain its properties.
`clearAllEventListeners()` | `this` | Removes all listeners to all events on the object.
`on( … )` | `this` | Alias to `addEventListener`.
`once( … )` | `this` | Alias to `addOneTimeEventListener`.
`off( … )` | `this` | Alias to `removeEventListener`.
`fire( … )` | `this` | Alias to `fireEvent`.

## Event objects

Event object is an object that you receive as an argument in a listener function when some event is fired, containing useful information about that event. For example:

    map.on('click', function(e) {
    	alert(e.latlng); // e is an event object (MouseEvent in this case)
    });

### Event

The base event object. All other event objects contain these properties too.

property | type | description
--- | --- | ---
`type` | `String` | The event type (e.g. `'click'`).
`target` | `Object` | The object that fired the event.

### MouseEvent

property | type | description
--- | --- | ---
`latlng` | `LatLng` | The geographical point where the mouse event occurred.
`layerPoint` | `Point` | Pixel coordinates of the point where the mouse event occurred relative to the map layer.
`containerPoint` | `Point` | Pixel coordinates of the point where the mouse event occurred relative to the map сontainer.
`originalEvent` | `DOMMouseEvent` | The original DOM mouse event fired by the browser.

### LocationEvent

property | type | description
--- | --- | ---
`latlng` | `LatLng` | Detected geographical location of the user.
`bounds` | `LatLngBounds` | Geographical bounds of the area user is located in (with respect to the accuracy of location).
`accuracy` | `Number` | Accuracy of location in meters.
`altitude` | `Number` | Height of the position above the WGS84 ellipsoid in meters.
`altitudeAccuracy` | `Number` | Accuracy of altitude in meters.
`heading` | `Number` | The direction of travel in degrees counting clockwise from true North.
`speed` | `Number` | Current velocity in meters per second.
`timestamp` | `Number` | The time when the position was acquired.

### ErrorEvent

property | type | description
--- | --- | ---
`message` | `String` | Error message.
`code` | `Number` | Error code (if applicable).

### LayerEvent

property | type | description
--- | --- | ---
`layer` | `ILayer` | The layer that was added or removed.

### LayersControlEvent

property | type | description
--- | --- | ---
`layer` | `ILayer` | The layer that was added or removed.
`name` | `String` | The name of the layer that was added or removed.

### TileEvent

property | type | description
--- | --- | ---
`tile` | `HTMLElement` | The tile element (image).
`url` | `String` | The source URL of the tile.

### TileErrorEvent

property | type | description
--- | --- | ---
`tile` | `HTMLElement` | The tile element (image).
`url` | `String` | The `src` attribute of the tile element.

### ResizeEvent

property | type | description
--- | --- | ---
`oldSize` | `Point` | The old size before resize event.
`newSize` | `Point` | The new size after the resize event.

### GeoJSON event

property | type | description
--- | --- | ---
`layer` | `ILayer` | The layer for the GeoJSON feature that is being added to the map.
`properties` | `Object` | GeoJSON properties of the feature.
`geometryType` | `String` | GeoJSON geometry type of the feature.
`id` | `String` | GeoJSON ID of the feature (if present).

### Popup event

property | type | description
--- | --- | ---
`popup` | `Popup` | The popup that was opened or closed.

### DragEndEvent

property | type | description
--- | --- | ---
`distance` | `Number` | The distance in pixels the draggable element was moved by.

## Class

`L.Class` powers the OOP facilities of Leaflet and is used to create almost all of the Leaflet classes documented here.

In addition to implementing a simple classical inheritance model, it introduces several special properties for convenient code organization — `options`, `includes` and `statics`.

    var MyClass = L.Class.extend({
    	initialize: function (greeter) {
    		this.greeter = greeter;
    		// class constructor
    	},

    	greet: function (name) {
    		alert(this.greeter + ', ' + name)
    	}
    });

    // create instance of MyClass, passing "Hello" to the constructor
    var a = new MyClass("Hello");

    // call greet method, alerting "Hello, World"
    a.greet("World");

The `initialize` method is your class's constructor function, meaning that it gets called when you do `new MyClass(...)`.

### Class Factories

You may have noticed that Leaflet objects are created without using the `new` keyword. This is achieved by complementing each class with a lowercase factory method:

    new L.Map('map'); // becomes:
    L.map('map');

The factories are implemented very easily, and you can do this for your own classes:

    L.map = function (id, options) {
    	return new L.Map(id, options);
    };

### Inheritance

You use `L.Class.extend` to define new classes, but you can use the same method on any class to inherit from it:

    var MyChildClass = MyClass.extend({
    	// ... new properties and methods
    });

This will create a class that inherits all methods and properties of the parent class (through a proper prototype chain), adding or overriding the ones you pass to `extend`. It will also properly react to `instanceof`:

    var a = new MyChildClass();
    a instanceof MyChildClass; // true
    a instanceof MyClass; // true

You can call parent methods (including constructor) from corresponding child ones (as you do with `super` calls in other languages) by accessing parent class prototype and using JavaScript's `call` or `apply`:

    var MyChildClass = MyClass.extend({
    	initialize: function () {
    		MyClass.prototype.initialize.call(this, "Yo");
    	},

    	greet: function (name) {
    		MyClass.prototype.greet.call(this, 'bro ' + name + '!');
    	}
    });

    var a = new MyChildClass();
    a.greet('Jason'); // alerts "Yo, bro Jason!"

### Options

`options` is a special property that unlike other objects that you pass to `extend` will be merged with the parent one instead of overriding it completely, which makes managing configuration of objects and default values convenient:

    var MyClass = L.Class.extend({
    	options: {
    		myOption1: 'foo',
    		myOption2: 'bar'
    	}
    });

    var MyChildClass = MyClass.extend({
    	options: {
    		myOption1: 'baz',
    		myOption3: 5
    	}
    });

    var a = new MyChildClass();
    a.options.myOption1; // 'baz'
    a.options.myOption2; // 'bar'
    a.options.myOption3; // 5

There's also `L.Util.setOptions`, a method for conveniently merging options passed to constructor with the defaults defined in the class:

    var MyClass = L.Class.extend({
    	options: {
    		foo: 'bar',
    		bla: 5
    	},

    	initialize: function (options) {
    		L.Util.setOptions(this, options);
    		...
    	}
    });

    var a = new MyClass({bla: 10});
    a.options; // {foo: 'bar', bla: 10}

### Includes

`includes` is a special class property that merges all specified objects into the class (such objects are called mixins). A good example of this is `L.Mixin.Events` that event-related methods like `on`, `off` and `fire` to the class.

     var MyMixin = {
    	foo: function () { ... },
    	bar: 5
    };

    var MyClass = L.Class.extend({
    	includes: MyMixin
    });

    var a = new MyClass();
    a.foo();

You can also do such includes in runtime with the `include` method:

    MyClass.include(MyMixin);

### Statics

`statics` is just a convenience property that injects specified object properties as the static properties of the class, useful for defining constants:

    var MyClass = L.Class.extend({
    	statics: {
    		FOO: 'bar',
    		BLA: 5
    	}
    });

    MyClass.FOO; // 'bar'

### Constructor Hooks

If you're a plugin developer, you often need to add additional initialization code to existing classes (e.g. editing hooks for `L.Polyline`). Leaflet comes with a way to do it easily using the `addInitHook` method:

    MyClass.addInitHook(function () {
    	// ... do something in constructor additionally
    	// e.g. add event listeners, set custom properties etc.
    });

You can also use the following shortcut when you just need to make one additional method call:

    MyClass.addInitHook('methodName', arg1, arg2, …);

## Browser

A namespace with properties for browser/feature detection used by Leaflet internally.

    if (L.Browser.ie6) {
    	alert('Upgrade your browser, dude!');
    }

property | type | description
--- | --- | ---
`ie` | `Boolean` | `true` for all Internet Explorer versions.
`ie6` | `Boolean` | `true` for Internet Explorer 6.
`ie7` | `Boolean` | `true` for Internet Explorer 7.
`ielt9` | `Boolean` | `true` for Internet Explorer versions less than 9.
`webkit` | `Boolean` | `true` for webkit-based browsers like Chrome and Safari (including mobile versions).
`webkit3d` | `Boolean` | `true` for webkit-based browsers that support CSS 3D transformations.
`android` | `Boolean` | `true` for Android mobile browser.
`android23` | `Boolean` | `true` for old Android stock browsers (2 and 3).
`mobile` | `Boolean` | `true` for modern mobile browsers (including iOS Safari and different Android browsers).
`mobileWebkit` | `Boolean` | `true` for mobile webkit-based browsers.
`mobileOpera` | `Boolean` | `true` for mobile Opera.
`touch` | `Boolean` | `true` for all browsers on touch devices.
`msTouch` | `Boolean` | `true` for browsers with Microsoft touch model (e.g. IE10).
`retina` | `Boolean` | `true` for devices with Retina screens.

## Util

Various utility functions, used by Leaflet internally.

### Methods

Method | Returns | Description
--- | --- | ---
`extend( <Object> dest, <Object> src?.. )` | `Object` | Merges the properties of the `src` object (or multiple objects) into `dest` object and returns the latter. Has an `L.extend` shortcut.
`bind( <Function> fn, <Object> obj )` | `Function` | Returns a function which executes function `fn` with the given scope `obj` (so that `this` keyword refers to `obj` inside the function code). Has an `L.bind` shortcut. Not a polyfill for ES 5 `bind` (compare `L.bind` to the MDN-recommended polyfill for `Function.prototype.bind`).
`stamp( <Object> obj )` | `String` | Applies a unique key to the object and returns that key. Has an `L.stamp` shortcut.
`requestAnimFrame( <Function> fn, <Object> context?, <Boolean> immediate?, <HTMLElement> element? )` | `Number` | Schedules `fn` to be executed when the browser repaints. When `immediate` is set, `fn` is called immediately if the browser doesn't have native support for `requestAnimationFrame`, otherwise it's delayed. Returns an id that can be used to cancel the request.
`cancelAnimFrame( <Number> id )` | - | Cancels a previous request to `requestAnimFrame`.
`limitExecByInterval( <Function> fn, <Number> time, <Object> context? )` | `Function` | Returns a wrapper around the function `fn` that makes sure it's called not more often than a certain time interval `time`, but as fast as possible otherwise (for example, it is used for checking and requesting new tiles while dragging the map), optionally passing the scope (`context`) in which the function will be called.
`falseFn()` | `Function` | Always returns `false`.
`formatNum( <Number> num, <Number> digits )` | `Number` | Returns the number `num` rounded to `digits` decimals.
`splitWords( <String> str )` | `String[]` | Trims and splits the string on whitespace and returns the array of parts.
`setOptions( <Object> obj, <Object> options )` | `Object` | Merges the given properties to the `options` of the `obj` object, returning the resulting options. See Class options. Has an `L.setOptions` shortcut.
`getParamString( <Object> obj )` | `String` | Converts an object into a parameter URL string, e.g. `{a: "foo", b: "bar"}` translates to `'?a=foo&b=bar'`.
`template( <String> str, <Object> data )` | `String` | Simple templating facility, accepts a template string of the form `'Hello {a}, {b}'` and a data object like `{a: 'foo', b: 'bar'}`, returns evaluated string (`'Hello foo, bar'`). You can also specify functions instead of strings for data values — they will be evaluated passing `data` as an argument.
`isArray( <Object> obj )` | `Boolean` | Returns `true` if the given object is an array.
`trim( <String> str )` | `String` | Trims the whitespace from both ends of the string and returns the result.

### Properties

Property | Type | Description
--- | --- | ---
`emptyImageUrl` | `String` | Data URI string containing a base64-encoded empty GIF image. Used as a hack to free memory from unused images on WebKit-powered mobile devices (by setting image `src` to this string).

## Transformation

Represents an affine transformation: a set of coefficients `a`, `b`, `c`, `d` for transforming a point of a form `(x, y)` into `(a*x + b, c*y + d)` and doing the reverse. Used by Leaflet in its projections code.

    var transformation = new L.Transformation(2, 5, -1, 10),
    	p = L.point(1, 2),
    	p2 = transformation.transform(p), //  L.point(7, 8)
    	p3 = transformation.untransform(p2); //  L.point(1, 2)

### Creation

Creation | Description
--- | ---
`new L.Transformation( <Number> a, <Number> b, <Number> c, <Number> d )` | Creates a transformation object with the given coefficients.

### Methods

Method | Returns | Description
--- | --- | ---
`transform( <Point> point, <Number> scale? )` | `Point` | Returns a transformed point, optionally multiplied by the given scale. Only accepts real `L.Point` instances, not arrays.
`untransform( <Point> point, <Number> scale? )` | `Point` | Returns the reverse transformation of the given point, optionally divided by the given scale. Only accepts real `L.Point` instances, not arrays.

## LineUtil

Various utility functions for polyline points processing, used by Leaflet internally to make polylines lightning-fast.

### Methods

Method | Returns | Description
--- | --- | ---
`simplify( <Point[]> points, <Number> tolerance )` | `Point[]` | Dramatically reduces the number of points in a polyline while retaining its shape and returns a new array of simplified points. Used for a huge performance boost when processing/displaying Leaflet polylines for each zoom level and also reducing visual noise. `tolerance` affects the amount of simplification (lesser value means higher quality but slower and with more points). Also released as a separated micro-library Simplify.js.
`pointToSegmentDistance( <Point> p, <Point> p1, <Point> p2 )` | `Number` | Returns the distance between point `p` and segment `p1` to `p2`.
`closestPointOnSegment( <Point> p, <Point> p1, <Point> p2 )` | `Point` | Returns the closest point from a point `p` on a segment `p1` to `p2`.
`clipSegment( <Point> a, <Point> b, <Bounds> bounds )` | `Point[]` | Clips the segment `a` to `b` by rectangular bounds. Returns either false or an array of clipped points. Used by Leaflet to only show polyline points that are on the screen or near, increasing performance.

## PolyUtil

Various utility functions for polygon geometries.

### Methods

Method | Returns | Description
--- | --- | ---
`clipPolygon( <Point[]> points, <Bounds> bounds )` | `Point[]` | Clips the polygon geometry defined by the given points by rectangular bounds. Used by Leaflet to only show polygon points that are on the screen or near, increasing performance. Note that polygon points needs different algorithm for clipping than polyline, so there's a separate method for it.

## DomEvent

Utility functions to work with the DOM events, used by Leaflet internally.

### Methods

Method | Returns | Description
--- | --- | ---
`addListener( <HTMLElement> el, <String> type, <Function> fn, <Object> context? )` | `this` | Adds a listener `fn` to the element's DOM event of the specified type. `this` keyword inside the listener will point to `context`, or to the element if not specified.
`removeListener( <HTMLElement> el, <String> type, <Function> fn )` | `this` | Removes an event listener from the element.
`stopPropagation( <DOMEvent> e )` | `this` | Stop the given event from propagation to parent elements. Used inside the listener functions:
    L.DomEvent.addListener(div, 'click', function (e) {
    	L.DomEvent.stopPropagation(e);
    });
`preventDefault( <DOMEvent> e )` | `this` | Prevents the default action of the event from happening (such as following a link in the `href` of the `a` element, or doing a `POST` request with page reload when `form` is submitted). Use it inside listener functions.
`stop( <DOMEvent> e )` | `this` | Does `stopPropagation` and `preventDefault` at the same time.
`disableClickPropagation( <HTMLElement> el )` | `this` | Adds `stopPropagation` to the element's `'click'`, `'doubleclick'`, `'mousedown'` and `'touchstart'` events.
`getMousePosition( <DOMEvent> e, <HTMLElement> container? )` | `Point` | Gets normalized mouse position from a DOM event relative to the container or to the whole page if not specified.
`getWheelDelta( <DOMEvent> e )` | `Number` | Gets normalized wheel delta from a `mousewheel` DOM event.

## DomUtil

Utility functions to work with the DOM tree, used by Leaflet internally.

### Methods

Method | Returns | Description
--- | --- | ---
`get( <String or HTMLElement> id )` | `HTMLElement` | Returns an element with the given id if a string was passed, or just returns the element if it was passed directly.
`getStyle( <HTMLElement> el, <String> style )` | `String` | Returns the value for a certain style attribute on an element, including computed values or values set through CSS.
`getViewportOffset( <HTMLElement> el )` | `Point` | Returns the offset to the viewport for the requested element.
`create( <String> tagName, <String> className, <HTMLElement> container? )` | `HTMLElement` | Creates an element with `tagName`, sets the `className`, and optionally appends it to `container` element.
`disableTextSelection()` | - | Makes sure text cannot be selected, for example during dragging.
`enableTextSelection()` | - | Makes text selection possible again.
`hasClass( <HTMLElement> el, <String> name )` | `Boolean` | Returns `true` if the element class attribute contains `name`.
`addClass( <HTMLElement> el, <String> name )` | - | Adds `name` to the element's class attribute.
`removeClass( <HTMLElement> el, <String> name )` | - | Removes `name` from the element's class attribute.
`setOpacity( <HTMLElement> el, <Number> value )` | - | Set the opacity of an element (including old IE support). Value must be from `0` to `1`.
`testProp( <String[]> props )` | `String` or `false` | Goes through the array of style names and returns the first name that is a valid style name for an element. If no such name is found, it returns `false`. Useful for vendor-prefixed styles like `transform`.
`getTranslateString( <Point> point )` | `String` | Returns a CSS transform string to move an element by the offset provided in the given point. Uses 3D translate on WebKit for hardware-accelerated transforms and 2D on other browsers.
`getScaleString( <Number> scale, <Point> origin )` | `String` | Returns a CSS transform string to scale an element (with the given scale origin).
`setPosition( <HTMLElement> el, <Point> point, <Boolean> disable3D? )` | - | Sets the position of an element to coordinates specified by `point`, using CSS translate or top/left positioning depending on the browser (used by Leaflet internally to position its layers). Forces top/left positioning if `disable3D` is `true`.
`getPosition( <HTMLElement> el )` | Point | Returns the coordinates of an element previously positioned with `setPosition`.

### Properties

Property | Type | Description
--- | --- | ---
`TRANSITION` | `String` | Vendor-prefixed transition style name (e.g. `'webkitTransition'` for WebKit).
`TRANSFORM` | `String` | Vendor-prefixed transform style name.

## PosAnimation

Used internally for panning animations, utilizing CSS3 Transitions for modern browsers and a timer fallback for IE6-9.

    var fx = new L.PosAnimation();
    fx.run(el, [300, 500], 0.5);

### Creation

Creation | Description
--- | ---
`new L.PosAnimation()` | Creates a PosAnimation object.

### Methods

Method | Returns | Description
--- | --- | ---
`run( <HTMLElement> element, <Point> newPos, <Number> duration?, <Number> easeLinearity? )` | `this` | Runs an animation of a given element to a new position, optionally setting duration in seconds (`0.25` by default) and easing linearity factor (3rd argument of the cubic bezier curve, `0.5` by default).

### Events

You can subscribe to the following events using these methods.

Event | Data | Description
--- | --- | ---
`start` | `Event` | Fired when the animation starts.
`step` | `Event` | Fired continuously during the animation.
`end` | `Event` | Fired when the animation ends.

## Draggable

A class for making DOM elements draggable (including touch support). Used internally for map and marker dragging. Only works for elements that were positioned with DomUtil#setPosition.

    var draggable = new L.Draggable(elementToDrag);
    draggable.enable();

### Creation

Creation | Description
--- | ---
`new L.Draggable( <HTMLElement> element, <HTMLElement> dragHandle? )` | Creates a Draggable object for moving the given element when you start dragging the `dragHandle` element (equals the element itself by default).

### Events

You can subscribe to the following events using these methods.

Event | Data | Description
--- | --- | ---
`dragstart` | `Event` | Fired when the dragging starts.
`predrag` | `Event` | Fired continuously during dragging before each corresponding update of the element position.
`drag` | `Event` | Fired continuously during dragging.
`dragend` | `Event` | Fired when the dragging ends.

### Methods

Method | Returns | Description
--- | --- | ---
`enable()` | `-` | Enables the dragging ability.
`disable()` | `-` | Disables the dragging ability.

## IHandler

An interface implemented by interaction handlers.

Method | Returns | Description
--- | --- | ---
`enable()` | - | Enables the handler.
`disable()` | - | Disables the handler.
`enabled()` | `Boolean` | Returns `true` if the handler is enabled.

## ILayer

Represents an object attached to a particular location (or a set of locations) on a map. Implemented by tile layers, markers, popups, image overlays, vector layers and layer groups.

### Methods

Method | Returns | Description
--- | --- | ---
`onAdd( <Map> map )` | - | Should contain code that creates DOM elements for the overlay, adds them to map panes where they should belong and puts listeners on relevant map events. Called on `map.addLayer(layer)`.
`onRemove( <Map> map )` | - | Should contain all clean up code that removes the overlay's elements from the DOM and removes listeners previously added in `onAdd`. Called on `map.removeLayer(layer)`.

### Implementing Custom Layers

The most important things know about when implementing custom layers are Map viewreset event and latLngToLayerPoint method. `viewreset` is fired when the map needs to reposition its layers (e.g. on zoom), and `latLngToLayerPoint` is used to get coordinates for the layer's new position.

Another event often used in layer implementations is moveend which fires after any movement of the map (panning, zooming, etc.).

Another thing to note is that you'll usually need to add `leaflet-zoom-hide` class to the DOM elements you create for the layer so that it hides during zoom animation. Implementing zoom animation for custom layers is a complex topic and will be documented separately in future, but meanwhile you can take a look at how it's done for Leaflet layers (e.g. `ImageOverlay`) in the source.

### Custom Layer Example

Here's how a custom layer implementation usually looks:

    var MyCustomLayer = L.Class.extend({

    	initialize: function (latlng) {
    		// save position of the layer or any options from the constructor
    		this._latlng = latlng;
    	},

    	onAdd: function (map) {
    		this._map = map;

    		// create a DOM element and put it into one of the map panes
    		this._el = L.DomUtil.create('div', 'my-custom-layer leaflet-zoom-hide');
    		map.getPanes().overlayPane.appendChild(this._el);

    		// add a viewreset event listener for updating layer's position, do the latter
    		map.on('viewreset', this._reset, this);
    		this._reset();
    	},

    	onRemove: function (map) {
    		// remove layer's DOM elements and listeners
    		map.getPanes().overlayPane.removeChild(this._el);
    		map.off('viewreset', this._reset, this);
    	},

    	_reset: function () {
    		// update layer's position
    		var pos = this._map.latLngToLayerPoint(this._latlng);
    		L.DomUtil.setPosition(this._el, pos);
    	}
    });

    map.addLayer(new MyCustomLayer(latlng));

## IControl

Represents a UI element in one of the corners of the map. Implemented by zoom, attribution, scale and layers controls.

### Methods

Every control in Leaflet should extend from Control class and additionally have the following methods:

Method | Returns | Description
--- | --- | ---
`onAdd( <Map> map )` | `HTMLElement` | Should contain code that creates all the neccessary DOM elements for the control, adds listeners on relevant map events, and returns the element containing the control. Called on `map.addControl(control)` or `control.addTo(map)`.
`onRemove( <Map> map )` | - | Optional, should contain all clean up code (e.g. removes control's event listeners). Called on `map.removeControl(control)` or `control.removeFrom(map)`. The control's DOM container is removed automatically.

### Custom Control Example

    var MyControl = L.Control.extend({
    	options: {
    		position: 'topright'
    	},

    	onAdd: function (map) {
    		// create the control container with a particular class name
    		var container = L.DomUtil.create('div', 'my-custom-control');

    		// ... initialize other DOM elements, add listeners, etc.

    		return container;
    	}
    });

    map.addControl(new MyControl());

If specify your own constructor for the control, you'll also probably want to process options properly:

    var MyControl = L.Control.extend({
    	initialize: function (foo, options) {
    		// ...
    		L.Util.setOptions(this, options);
    	},
    	// ...
    });

This will allow you to pass options like `position` when creating the control instances:

    map.addControl(new MyControl('bar', {position: 'bottomleft'}));

## IProjection

An object with methods for projecting geographical coordinates of the world onto a flat surface (and back). See Map projection.

### Methods

Method | Returns | Description
--- | --- | ---
`project( <LatLng> latlng )` | `Point` | Projects geographical coordinates into a 2D point.
`unproject( <Point> point )` | `LatLng` | The inverse of `project`. Projects a 2D point into geographical location.

### Defined Projections

Leaflet comes with a set of already defined projections out of the box:

Projection | Description
--- | ---
`L.Projection.SphericalMercator` | Spherical Mercator projection — the most common projection for online maps, used by almost all free and commercial tile providers. Assumes that Earth is a sphere. Used by the `EPSG:3857` CRS.
`L.Projection.Mercator` | Elliptical Mercator projection — more complex than Spherical Mercator. Takes into account that Earth is a geoid, not a perfect sphere. Used by the `EPSG:3395` CRS.
`L.Projection.LonLat` | Equirectangular, or Plate Carree projection — the most simple projection, mostly used by GIS enthusiasts. Directly maps `x` as longitude, and `y` as latitude. Also suitable for flat worlds, e.g. game maps. Used by the `EPSG:3395` and `Simple` CRS.

## ICRS

Defines coordinate reference systems for projecting geographical points into pixel (screen) coordinates and back (and to coordinates in other units for WMS services). See Spatial reference system.

### Methods

Method | Returns | Description
--- | --- | ---
`latLngToPoint( <LatLng> latlng, <Number> zoom )` | `Point` | Projects geographical coordinates on a given zoom into pixel coordinates.
`pointToLatLng( <Point> point, <Number> zoom )` | `LatLng` | The inverse of `latLngToPoint`. Projects pixel coordinates on a given zoom into geographical coordinates.
`project( <LatLng> latlng )` | `Point` | Projects geographical coordinates into coordinates in units accepted for this CRS (e.g. meters for `EPSG:3857`, for passing it to WMS services).
`scale( <Number> zoom )` | `Number` | Returns the scale used when transforming projected coordinates into pixel coordinates for a particular zoom. For example, it returns `256 * 2^zoom` for Mercator-based CRS.
`getSize( <Number> zoom )` | `Point` | Returns the size of the world in pixels for a particular zoom.

### Properties

Property | Type | Description
--- | --- | ---
`projection` | `IProjection` | Projection that this CRS uses.
`transformation` | `Transformation` | Transformation that this CRS uses to turn projected coordinates into screen coordinates for a particular tile service.
`code` | `String` | Standard code name of the CRS passed into WMS services (e.g. `'EPSG:3857'`).

### Defined CRS

Leaflet comes with a set of already defined CRS to use out of the box:

Projection | Description
--- | ---
`L.CRS.EPSG3857` | The most common CRS for online maps, used by almost all free and commercial tile providers. Uses Spherical Mercator projection. Set in by default in Map's `crs` option.
`L.CRS.EPSG4326` | A common CRS among GIS enthusiasts. Uses simple Equirectangular projection.
`L.CRS.EPSG3395` | Rarely used by some commercial tile providers. Uses Elliptical Mercator projection.
`L.CRS.Simple` | A simple CRS that maps longitude and latitude into `x` and `y` directly. May be used for maps of flat surfaces (e.g. game maps). Note that the `y` axis should still be inverted (going from bottom to top).

If you want to use some obscure CRS not listed here, take a look at the Proj4Leaflet plugin.

## Global Switches

Global switches are created for rare cases and generally make Leaflet to not detect a particular browser feature even if it's there. You need to set the switch as a global variable to `true` before including Leaflet on the page, like this:

    <script>L_PREFER_CANVAS = true;</script>
    <script src="leaflet.js"></script>

Switch | Description
--- | ---
`L_PREFER_CANVAS` | Forces Leaflet to use the Canvas back-end (if available) for vector layers instead of SVG. This can increase performance considerably in some cases (e.g. many thousands of circle markers on the map).
`L_NO_TOUCH` | Forces Leaflet to not use touch events even if it detects them.
`L_DISABLE_3D` | Forces Leaflet to not use hardware-accelerated CSS 3D transforms for positioning (which may cause glitches in some rare environments) even if they're supported.

## noConflict

This method restores the L global variable to the original value it had before Leaflet inclusion, and returns the real Leaflet namespace so you can put it elsewhere, like this:

    // L points to some other library
    ...
    // you include Leaflet, it replaces the L variable to Leaflet namespace

    var Leaflet = L.noConflict();
    // now L points to that other library again, and you can use Leaflet.Map etc.

## version

A constant that represents the Leaflet version in use.

    L.version // contains "0.5" (or whatever version is currently in use)