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POWhat's the most concise cross-browser way to access an <iframe> element's window and document?
 

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  1. POWhat's the most concise cross-browser way to access an <iframe> element's window and document?
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    <p>I'm trying to figure out the best way to access an <code>&lt;iframe&gt;</code> element's <code>window</code> and <code>document</code> properties from a parent page. The <code>&lt;iframe&gt;</code> may be created via JavaScript or accessed via a reference stored in an object property or a variable, so, if I understand correctly, that rules out the use of <code>document.frames</code>.</p> <p>I've seen this done a number of ways, but I'm unsure about the best approach. Given an <code>&lt;iframe&gt;</code> created in this way:</p> <pre><code>var iframe = document.createElement('iframe'); document.getElementsByTagName('body')[0].appendChild(iframe); </code></pre> <p>I'm currently using this to access the <code>document</code>, and it seems to work OK across the major browsers:</p> <pre><code>var doc = iframe.contentWindow || iframe.contentDocument; if (doc.document) { doc = doc.document; } </code></pre> <p>I've also see this approach:</p> <pre><code>var iframe = document.getElementById('my_iframe'); iframe = (iframe.contentWindow) ? iframe.contentWindow : (iframe.contentDocument.document) ? iframe.contentDocument.document : iframe.contentDocument; iframe.document.open(); iframe.document.write('Hello World!'); iframe.document.close(); </code></pre> <p>That confuses me, since it seems that if <code>iframe.contentDocument.document</code> is defined, you're going to end up trying to access <code>iframe.contentDocument.document.document</code>.</p> <p>There's also this:</p> <pre><code>var frame_ref = document.getElementsByTagName('iframe')[0]; var iframe_doc = frame_ref.contentWindow ? frame_ref.contentWindow.document : frame_ref.contentDocument; </code></pre> <p>In the end, I guess I'm confused as to which properties hold which properties, whether <code>contentDocument</code> is equivalent to <code>document</code> or whether there is such a property as <code>contentDocument.document</code>, etc.</p> <p>Can anyone point me to an accurate/timely reference on these properties, or give a quick briefing on how to efficiently access an <code>&lt;iframe&gt;</code>'s <code>window</code> and <code>document</code> properties in a cross-browser way (without the use of jQuery or other libraries)?</p> <p>Thanks for any help!</p>
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