javascript - Firefox not able to find iframe - Stack Overflow

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This is the iframe I'm trying to access:

 <div class="mceBody" id="additionalTxt_b">
        <iframe frameborder="0" id="additionalTxt_f" src='javascript:""' class="punymce"/>
 </div>

Using this line:

frames['additionalTxt_f'].document.getElementsByTagName("body")[0].innerHTML

For some reason I'm getting "frames.additionalTxt_f is undefined" from firebug. I have similar iframes (dynamically created by punyMCE plugin) on other pages, and they work perfectly fine. And IE7/8 has no problem accessing this iframe either.

Just at a plete loss here. Any ideas on why Firefox can't find the iframe?

This is the iframe I'm trying to access:

 <div class="mceBody" id="additionalTxt_b">
        <iframe frameborder="0" id="additionalTxt_f" src='javascript:""' class="punymce"/>
 </div>

Using this line:

frames['additionalTxt_f'].document.getElementsByTagName("body")[0].innerHTML

For some reason I'm getting "frames.additionalTxt_f is undefined" from firebug. I have similar iframes (dynamically created by punyMCE plugin) on other pages, and they work perfectly fine. And IE7/8 has no problem accessing this iframe either.

Just at a plete loss here. Any ideas on why Firefox can't find the iframe?

• javascript
• html

Share Improve this question Follow asked Apr 6, 2009 at 10:03 peirixpeirix 37.8k2424 gold badges9898 silver badges130130 bronze badges

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2 Answers 2

Sorted by: Reset to default 8

The window.frames[] array is indexed by the [i]frame's name attribute (aka frame target). id can't be relied upon to also work — although it may in IE <8, which often thinks names and ids are the same thing.

If you want to access a frame's content via ID, use the DOM Level 2 HTML contentDocument property instead of the old-school (“DOM Level 0”) frames array:

document.getElementById('additionalTxt_f').contentDocument.body.innerHTML

...but then, for patibility with IE <8, you also have to add some fallback cruft, since it doesn't support contentDocument:

var f= document.getElementById('additionalTxt_f');
var d= f.contentDocument? f.contentDocument : f.contentWindow.document;
d.body.innerHTML

So it's up to you which method you think is less ugly: the extra script work, or just using the name attribute.

if you have only 1 iframe you can also find it with window.frames[1] or document.getElementsByTagName('iframe')[0]

(In the first option, the parent window is #0)

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