Get IFrame's document, from JavaScript in main document

I have this HTML code:

    <script type="text/javascript">
      function GetDoc(x)
        return x.document ||
          x.contentDocument ||

      function DoStuff()
        var fr = document.all["myframe"];
        while(fr.ariaBusy) { }
        var doc = GetDoc(fr);
        if (doc == document)
    <iframe id="myframe" src="" width="100%" height="100%" onload="DoStuff()"></iframe>

The problem is that I get message "Bad". That mean that the document of iframe is not got correctly, and what is actualy returned by GetDoc function is the parent document.

I would be thankful, if you told where I do my mistake. (I want to get document hosted in IFrame.)

Thank you.



You should be able to access the document in the IFRAME using the following code:


However, you will not be able to do this if the page in the frame is loaded from a different domain (such as THis is because of the browser's Same Origin Policy.


The problem is that in IE (which is what I presume you're testing in), the <iframe> element has a document property that refers to the document containing the iframe, and this is getting used before the contentDocument or contentWindow.document properties. What you need is:

function GetDoc(x) {
    return x.contentDocument || x.contentWindow.document;

Also, document.all is not available in all browsers and is non-standard. Use document.getElementById() instead.


In case you get a cross-domain error:

If you have control over the content of the iframe - that is, if it is merely loaded in a cross-origin setup such as on Amazon Mechanical Turk - you can circumvent this problem with the <body onload='my_func(my_arg)'> attribute for the inner html.

For example, for the inner html, use the this html parameter (yes - this is defined and it refers to the parent window of the inner body element):

<body onload='changeForm(this)'>

In the inner html :

    function changeForm(window) {
        console.log('inner window loaded: do whatever you want with the inner html');
        window.document.getElementById('mturk_form').style.display = 'none';


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