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    <p><strong>UPDATE 2013</strong> as of this edit, the File API is supported in all major browsers, and in IE as of version 10</p> <p><a href="http://caniuse.com/#search=file%20api" rel="nofollow noreferrer">http://caniuse.com/#search=file%20api</a></p> <p>You may still wish to use SWFUpload if you still need to support IE9 and under, though at this point it should probably be more of a fallback, since the html5 file api has support on mobile platforms where SWFUpload cannot reach. The html5 file api is based on firefox's file api as noted below.</p> <p>See also this duplicate question <a href="https://stackoverflow.com/questions/4112575/client-checking-file-size-using-html5">Client Checking file size using HTML5?</a></p> <p><strong>UPDATE:</strong> Firefox has changed their API to this <a href="https://developer.mozilla.org/en/DOM/FileReader" rel="nofollow noreferrer">https://developer.mozilla.org/en/DOM/FileReader</a></p> <p>You can do it in firefox like so</p> <p>html:</p> <blockquote> <pre><code>&lt;form action="" method="get" accept-charset="utf-8"&gt; &lt;input type="file" name="file" value="" id="file"&gt; &lt;p&gt;&lt;input type="submit" value="Continue &amp;rarr;"&gt;&lt;/p&gt; &lt;/form&gt; </code></pre> </blockquote> <p>javascript:</p> <pre><code>var filesize = document.forms[0].file.files[0].fileSize </code></pre> <p>if there's a way to do this in IE, I don't know it. It probably involves activeX or some other such rubbish.</p> <p>edit: I found this <a href="http://www.kavoir.com/2009/01/check-for-file-size-with-javascript-before-uploading.html" rel="nofollow noreferrer">here</a>, HOW TO DO THIS IN IE</p> <pre><code>&lt;head&gt; &lt;script&gt; function getSize() { var myFSO = new ActiveXObject("Scripting.FileSystemObject"); var filepath = document.upload.file.value; var thefile = myFSO.getFile(filepath); var size = thefile.size; alert(size + " bytes"); } &lt;/script&gt; &lt;/head&gt; &lt;body&gt; &lt;form name="upload"&gt; &lt;input type="file" name="file"&gt; &lt;input type="button" value="Size?" onClick="getSize();"&gt; &lt;/form&gt; &lt;/body&gt; &lt;/html&gt; </code></pre>
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    1. POhow validate file size using HTML and Javascript on client side
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    1. CO+1 I didn't know that - deleted my post.
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    2. CO+1 While this is a good approach (using Javascript which the original question was about), you're really just making a solution for two browsers. Of course, these are two of the most popular browsers, but if you need multiple browser/platform support, it might prove quite difficult to implement.
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    3. COJavascript cannot be a replacement for checking the filesize on the server. If the goal is simply to save some resources, then that goal is possible, I think.
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