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javascript - Getting the document object of an iframe

I'm trying to get the document object of an iframe, but none of the examples I've googled seem to help. My code looks like this:

<html>
    <head>
        <script>
            function myFunc(){
                alert("I'm getting this far");
                var doc=document.getElementById("frame").document;
                alert("document is undefined: "+doc);
            }
        </script>
    </head>
    <body>
        <iframe src="http://www.google.com/ncr" id="frame" width="100%" height="100%" onload="myFync()"></iframe>
    </body>
</html>

I have tested that I am able to obtain the iframe object, but .document doesn't work, neither does .contentDocument and I think I've tested some other options too, but all of them return undefined, even examples that are supposed to have worked but they don't work for me. So I already have the iframe object, now all I want is it's document object. I have tested this on Firefox and Chrome to no avail.

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Try the following

var doc=document.getElementById("frame").contentDocument;

// Earlier versions of IE or IE8+ where !DOCTYPE is not specified
var doc=document.getElementById("frame").contentWindow.document;

Note: AndyE pointed out that contentWindow is supported by all major browsers so this may be the best way to go.

Note2: In this sample you won't be able to access the document via any means. The reason is you can't access the document of an iframe with a different origin because it violates the "Same Origin" security policy


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