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Javascript gets iframe source content

I have problems with Javascript: I created this page:

<html> <body> <iframe id="a" src="iframe.php" width="500" height="200"></iframe> </body> </html>

and inside iframe.php , I just repeat the JSON line:

 <?php $json = array( 'status' => 'error', 'html' => '<span class="cool">This is a string</span>' ); echo json_encode( $json );

What I want is to get the correct source string echoed by iframe.php using Javascript (possibly jQuery) and parse it as a JSON object.

But the problem is that I always get the wrong content. I tried the method described here and jQuery('iframe').contents().find('body').html() , but no luck. The span tag is missing or not formatted correctly.

Please help me. Thanks.

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 <script> var frameId = 'a'; // the frame id in your sample code var frameHtml = frames[frameId].document.documentElement.innerHTML; </script>
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