Cross domain iFrames

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Gadget to Gadget

The publish-subscribe framework allows publisher gadgets on iGoogle to communicate changes to subscriber gadgets that have declared interest in those changes. http://code.google.com/apis/gadgets/docs/pubsub.html
https://developers.google.com/maps/documentation/mapplets/basics Note: The Google Mapplets API has been officially deprecated as of May 19, 2010.

Mapplets

Welcome to Mahemoff's blog on web development, UX, and software development. I most recently worked in developer relations at Google, focusing on Chrome and HTML5, and am now busy baking a few apps independently. http://softwareas.com/cross-domain-communication-with-iframes

IFrames - Cross-Domain Communication

http://shouldersofgiants.co.uk/Blog/post/2009/08/17/Another-Cross-Domain-iFrame-Communication-Technique.aspx

Another Cross Domain iFrame

Basically, a page can change the fragment part of an iFrame’s Location URL (i.e. the part of the URL after the # symbol) without the iFrame reloading. So this part of the URL can be used to pass messages to the iFrame… if only the iFrame contents knew the URL had changed! Most articles on using the URL Fragment technique advocate the target iFrame polling its Location to detect changes in the fragment… perhaps checking 5 times a second.