http://snippets.dzone.com/posts Sat, 11 Oct 2008 14:28:57 GMT DZone Snippets: cancel code http://snippets.dzone.com/posts/show/1367 <code> <br />// Extension to Ajax allowing for classes of requests of which only one (the latest) is ever active at a time <br />// - stops queues of now-redundant requests building up / allows you to supercede one request with another easily. <br /> <br />// just pass in onlyLatestOfClass: 'classname' in the options of the request <br /> <br />Ajax.currentRequests = {}; <br /> <br />Ajax.Responders.register({ <br /> onCreate: function(request) { <br /> if (request.options.onlyLatestOfClass && Ajax.currentRequests[request.options.onlyLatestOfClass]) { <br /> // if a request of this class is already in progress, attempt to abort it before launching this new request <br /> try { Ajax.currentRequests[request.options.onlyLatestOfClass].transport.abort(); } catch(e) {} <br /> } <br /> // keep note of this request object so we can cancel it if superceded <br /> Ajax.currentRequests[request.options.onlyLatestOfClass] = request; <br /> }, <br /> onComplete: function(request) { <br /> if (request.options.onlyLatestOfClass) { <br /> // remove the request from our cache once completed so it can be garbage collected <br /> Ajax.currentRequests[request.options.onlyLatestOfClass] = null; <br /> } <br /> } <br />}); <br /></code> Mon, 06 Feb 2006 22:34:12 GMT http://snippets.dzone.com/posts/show/1367 matth (Matthew)