8.1.10 Handling Duplicate Form Submissions - Reference Documentation
Authors: Graeme Rocher, Peter Ledbrook, Marc Palmer, Jeff Brown, Luke Daley, Burt Beckwith, Lari Hotari
Version: 3.1.8
8.1.10 Handling Duplicate Form Submissions
Grails has built-in support for handling duplicate form submissions using the "Synchronizer Token Pattern". To get started you define a token on the form tag:<g:form useToken="true" ...>
withForm { // good request }.invalidToken { // bad request }
invalidToken
method then by default Grails will store the invalid token in a flash.invalidToken
variable and redirect the request back to the original page. This can then be checked in the view:<g:if test="${flash.invalidToken}"> Don't click the button twice! </g:if>
The withForm tag makes use of the session and hence requires session affinity or clustered sessions if used in a cluster.