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    <p>To get the button inside of the iframe, this could work:</p> <pre><code>var iframe = document.getElementById("frame1"); var iframeDocument = iframe.contentDocument || iframe.contentWindow.document; var button = iframeDocument.getElementById("mybutton"); </code></pre> <p>Obviously, you can navigate to get what you want with <code>iframeDocument</code>, and use <code>.innerHTML</code> as you seem to know. You cannot get the contents of the iframe if the iframe is pointing to a domain other than its parent.</p> <p><strong>UPDATE:</strong></p> <p>You need to use the code to get the frame's document and its contents <strong>after</strong> it's ready, so you should use something like this:</p> <pre><code>window.onload = function () { var greeting = "hola, "; var div1 = document.createElement("div"); var frame1 = document.createElement("iframe"); frame1.id = "frame1"; frame1.onload = function () { alert("loaded"); var iframe = document.getElementById("frame1"); var iframeDocument = iframe.contentDocument || iframe.contentWindow.document; var button = iframeDocument.getElementById("mybutton"); if (button == null) { alert("button is null"); } }; frame1.src = "http://onemoredemo.appspot.com"; div1.appendChild(frame1); document.body.appendChild(div1); }; </code></pre> <p><strong>DEMO:</strong> <a href="http://jsfiddle.net/nqTnz/" rel="nofollow">http://jsfiddle.net/nqTnz/</a></p> <p>The important thing is how the elements are created and appended to the DOM - not just using <code>innerHTML</code>. The <code>onload</code> method of the iframe is to guarantee it's ready. The actual manipulation code won't work in the jsFiddle because the cross-domain problems, but is what you should need.</p>
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    1. POHow to get innerHTML content of iframe element
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    1. COvar iframe = document.getElementById("frame1"); var iframeDocument = iframe.contentDocument || iframe.contentWindow.document var button = iframeDocument.getElementById("mybutton") button.addEventListener("click", function() { alert('Hello World'); }, false); i am getting error "Cannot call method 'addEventListener' of null " why i am getting this error iframeDocument is not null
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    2. COplease reply to this error
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    3. COWhere in your code are you calling this code you posted in the comment? Please update your question with more of your code and where it's all being used
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