Hi there, If you are using GWT 2 you can now move to use the JsonpRequestBuilder.
http://eggsylife.co.uk/2010/04/22/gwt-2-jsonp-and-javascript-overlays-with-jsonprequestbuilder/ Eggsy On Apr 27, 10:02 pm, gkneller <ge...@pocketconnections.com> wrote: > Hi GWT Team; I implemented the following method described in this > tutorial on cross-site scripting using JSONP in my GWT > application:http://code.google.com/webtoolkit/doc/latest/tutorial/Xsite.html > > Unfortunately, I found that the following code from the tutorial has > unexpected consequences on IE8 and the JavaScript function run by the > setTimeout() never completes: > > // [2] Define the callback function on the window object. > window[callback] = function(jsonObj) { > // [3] > > handl...@com.google.gwt.sample.stockwatcher.client.stockwatcher::handleJsonResponse(Lcom/ > google/gwt/core/client/JavaScriptObject;)(jsonObj); > window[callback + "done"] = true; > } > > // [4] JSON download has 1-second timeout. > setTimeout(function() { > if (!window[callback + "done"]) { > > handl...@com.google.gwt.sample.stockwatcher.client.stockwatcher::handleJsonResponse(Lcom/ > google/gwt/core/client/JavaScriptObject;)(null); > } > > // [5] Cleanup. Remove script and callback elements. > document.body.removeChild(script); > delete window[callback]; > delete window[callback + "done"]; > }, 1000); > > Calling delete on window[callback], throws an error in IE8, the reason > being that window[callback] is (perhaps mistakenly) treated as a > property of a Global object which can't be deleted. The last line, > delete window[callback+"done"], never gets executed and the window[] > array grows over time. Chrome doesn't seem to have the same problem. > The best description I've found of the problem with the delete > operator and the inconsistencies between browsers is > here:http://perfectionkills.com/understanding-delete/ > > So I would like to suggest that this tutorial be modified, as in its > current form it causes a rather significant 'memory leak' (i.e. the > size of the window[] array grows the more you use it) in IE - whether > or not the implementation of the delete operator in IE is correct, > it's what's out there. I myself am going to look into re-implementing > my app with JsonpRequestBuilder. Perhaps the tutorial code could be re- > written using the splice() function to remove the objects from the > array, but it seems it would be quite a pain to find the numerical > index. > > -- > You received this message because you are subscribed to the Google Groups > "Google Web Toolkit" group. > To post to this group, send email to google-web-tool...@googlegroups.com. > To unsubscribe from this group, send email to > google-web-toolkit+unsubscr...@googlegroups.com. > For more options, visit this group > athttp://groups.google.com/group/google-web-toolkit?hl=en. -- You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group. To post to this group, send email to google-web-tool...@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
