I’ve helped a colleague of mine work on a cross domain widget we are building for our applications that allows a user from an application to add information to another application through a pop up widget. Implementation wise, we used a a simple form implemented using ExtJS FormPanel class. Some of the form fields like State and County dropdowns are dynamically loaded after rendering, again using ExtJS’s ScriptTagProxy for cross-domain retrieval, no issue here and for more information on cross-domain data retrieval you can check out this post here.
By the way if you a looking for a good XDM library, check out EasyXDM.
Addendum: As noted by Oyvind Sean Kinsey in the comments below, what i was trying to accomplish here was XDM, Cross Domain Messaging and not XSS Cross Site Scripting which is actually a security exploit. Thanks again Sean for the clarification, i understand now why the EasyXDM library was renamed from being initially called EasyXSS.
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