How to get the body's content of an iframe in Javascript?

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予麋鹿 2020-11-22 01:52

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                <span>(楼主)</span>
            
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                <span>2020-11-22 02:39</span>
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<p>The exact question is how to do it with pure JavaScript not with jQuery.</p>

<p>But I always use the solution that can be found in jQuery's source code.
It's just one line of native JavaScript.</p>

<p>For me it's the best, easy readable and even <em>afaik</em> the shortest way to get the iframes content.</p>

<p><strong>First get your iframe</strong></p>

<pre><code>var iframe = document.getElementById('id_description_iframe');

// or
var iframe = document.querySelector('#id_description_iframe');
</code></pre>

<p><strong>And then use jQuery's solution</strong></p>

<pre><code>var iframeDocument = iframe.contentDocument || iframe.contentWindow.document;
</code></pre>

<blockquote>
  <p>It works even in the Internet Explorer which does this trick during the <code>contentWindow</code> property of the <code>iframe</code> object. Most other browsers uses the <code>contentDocument</code> property and that is the reason why we proof this property first in this OR condition. If it is not set try <code>contentWindow.document</code>.</p>
</blockquote>

<p><strong>Select elements in iframe</strong></p>

<p>Then you can usually use <code>getElementById()</code> or even <code>querySelectorAll()</code> to select the DOM-Element from the <code>iframeDocument</code>:</p>

<pre><code>if (!iframeDocument) {
    throw "iframe couldn't be found in DOM.";
}

var iframeContent = iframeDocument.getElementById('frameBody');

// or
var iframeContent = iframeDocument.querySelectorAll('#frameBody');
</code></pre>

<p><strong>Call functions in the iframe</strong></p>

<p>Get just the <code>window</code> element from <code>iframe</code> to call some global functions, variables or whole libraries (e.g. <code>jQuery</code>):</p>

<pre><code>var iframeWindow = iframe.contentWindow;

// you can even call jQuery or other frameworks
// if it is loaded inside the iframe
iframeContent = iframeWindow.jQuery('#frameBody');

// or
iframeContent = iframeWindow.$('#frameBody');

// or even use any other global variable
iframeWindow.myVar = window.myVar;

// or call a global function
var myVar = iframeWindow.myFunction(param1 /*, ... */);
</code></pre>

<p><strong>Note</strong></p>

<p>All this is possible if you observe the same-origin policy.</p>
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