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POHTML5 postMessage returns undefined
 

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  1. POHTML5 postMessage returns undefined
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    <p>I am trying to do cross-domain communication using postMessage between a page (on example1.com) and an iframe on the same page that is on example2.com</p> <p>When the iframe is done loading, it sends a postMessage to the parent page using the following command:</p> <p><strong>parent.postMessage('hello parent', 'http://example1.com'); //this command works</strong></p> <p>In the event handler for postMessage in the parent page (on example1.com), I send a response back to the child page (example2.com) using the following function:</p> <pre><code>//this function is defined in example1.com: function receiveMessage(event){ if (event.origin == "http://example2.com"){ console.log('Message Received from iframe'); //this line works event.source.postMessage('hello to you too', event.origin); //this line does not work } } </code></pre> <p>For some reason, the event handler for postMessage in the iframe is not triggered.</p> <pre><code>//this function is defined in example2.com function receiveMessage(event){ if (event.origin == "http://example1.com"){ // I even tried removing this check to no avail console.log('Message Received from parent'); //this line works } } </code></pre> <p>When the parent tries to send a message to the iframe it simply returns undefined.</p> <p>Any help is appreciated!</p> <p>EDIT:</p> <p>I tried changing the following line in example1.com's receiveMessage event:</p> <p><strong>event.source.postMessage('hello to you too', event.origin);</strong></p> <p>to this:</p> <p><strong>event.source.postMessage('hello to you too', 'http://example2.com');</strong></p> <p>But I get this following error:</p> <p><strong>Unable to post message to <a href="http://example2.com" rel="nofollow">http://example2.com</a>. Recipient has origin <a href="http://example1.com" rel="nofollow">http://example1.com</a></strong></p> <p>Why is event.origin evaluating to <a href="http://example1.com" rel="nofollow">http://example1.com</a> when it is receiving a message from example2.com?</p> <p>example1.com is trying to send itself a postMessage. This ought to be the source of the error</p>
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    1. CO1) Browser? 2) What does 'parent' evaluate to?
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    2. COYou say the "message received from parent" works - then doesn't the non-working line in fact work?
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    3. CO1) Chrome v22.0.1229.94. 2) parent evalutes to Window in the console, i.e. example1.com
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