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When I try to access the iframe, I get this error and I'm not sure what i'm doing wrong. Can someone help me out with this problem?

var ifrm = document.getElementById('iframe'),
ifrm = (ifrm.contentWindow) ? ifrm.contentWindow :
                              (ifrm.contentDocument.document)
                            ? ifrm.contentDocument.document :
                              ifrm.contentDocument;

ifrm.open();
ifrm.write("Hello World!");
ifrm.close();

These are the errors I recieve:

Uncaught TypeError: Cannot read property 'document' of undefined

Uncaught TypeError: Cannot read property 'readyState' of undefined

When I try to access the iframe, I get this error and I'm not sure what i'm doing wrong. Can someone help me out with this problem?

var ifrm = document.getElementById('iframe'),
ifrm = (ifrm.contentWindow) ? ifrm.contentWindow :
                              (ifrm.contentDocument.document)
                            ? ifrm.contentDocument.document :
                              ifrm.contentDocument;

ifrm.open();
ifrm.write("Hello World!");
ifrm.close();

These are the errors I recieve:

Uncaught TypeError: Cannot read property 'document' of undefined

Uncaught TypeError: Cannot read property 'readyState' of undefined

  • javascript
  • dom
  • iframe
  • cross-domain
Share Improve this question edited Feb 16, 2020 at 7:15 sideshowbarker♦ 88.4k29 gold badges215 silver badges212 bronze badges asked Jul 3, 2012 at 18:54 cclervcclerv 2,9698 gold badges37 silver badges43 bronze badges 4
  • 3 Cannot read property 'document' of undefined is pretty clear – Alex Commented Jul 3, 2012 at 18:56
  • 1 iframe.contentWindow is not cross-browser? – Šime Vidas Commented Jul 3, 2012 at 19:00
  • 3 On a side note: Say "No" to nested ternary operators. – FishBasketGordo Commented Jul 3, 2012 at 19:02
  • I assume ifrm is a reference to an iframe node (like var ifrm = document.querySelector('iframe') for example). In that case you can have: ifrm.contentDocument or ifrm.contentWindow.document. – ZER0 Commented Jul 3, 2012 at 19:02
Add a ment  | 

2 Answers 2

Reset to default 3

You are looking for the DOM element:

<iframe>

iframe is the name of an HTML tag, not the value of the id of this element (which would be defined as id="value") so you want to use:

document.getElementsByTagName('iframe')[0]

Change the 0 to whatever index is desired if there are multiple iframes on your page as getElementsByTagName() will return an array of results, even if there is only one iframe on the page.

Furthermore, you can simplify your ternary operation as follows:

ifrm = ifrm.contentWindow ? ifrm.contentWindow.document : ifrm.contentDocument;

This way you can obtain the document object for the iframe in all browsers which will give you access to the open(), write(), and close() methods as well as the readyState attribute.

put javascript source after tag.

like this 

<html>
<head>
</head>
<body>
<iframe>
<script>
blah blah
</script>
</body>
</html>

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