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    <p>I wrote a <a href="http://www.joshclarkson.net/blog/file-uploads-in-a-hidden-iframe-using-jquery/" rel="nofollow noreferrer">blog post</a> about doing this with jQuery to upload a file using a hidden iframe. Here's the code:</p> <p>Here is the HTML for the form:</p> <pre><code>&lt;div id="uploadform"&gt; &lt;form id="theuploadform"&gt; &lt;input type="hidden" id="max" name="MAX_FILE_SIZE" value="5000000" &gt; &lt;input id="userfile" name="userfile" size="50" type="file"&gt; &lt;input id="formsubmit" type="submit" value="Send File" &gt; &lt;/form&gt; </code></pre> <p>The DIV in which to allow jQuery to create the iframe you can hide it with a little CSS:</p> <pre><code>&lt;div id="iframe" style="width:0px height:0px visibility:none"&gt; &lt;/div&gt; </code></pre> <p>The DIV in which to show the results of the callback:</p> <pre><code>&lt;div id="textarea"&gt; &lt;/div&gt; </code></pre> <p>The jQuery code:</p> <pre><code>&lt;script type="text/javascript" src="js/jquery-1.3.2.min.js"&gt;&lt;/script&gt; &lt;script type="text/javascript"&gt; $(document).ready(function(){ $("#formsubmit").click(function() { var userFile = $('form#userfile').val(); var max = $('form#max').val(); var iframe = $( '&lt;iframe name="postframe" id="postframe" class="hidden" src="about:none" /&gt;' ); $('div#iframe').append( iframe ); $('#theuploadform').attr( "action", "uploader.php" ) $('#theuploadform').attr( "method", "post" ) $('#theuploadform').attr( "userfile", userFile ) $('#theuploadform').attr( "MAX_FILE_SIZE", max ) $('#theuploadform').attr( "enctype", "multipart/form-data" ) $('#theuploadform').attr( "encoding", "multipart/form-data" ) $('#theuploadform').attr( "target", "postframe" ) $('#theuploadform').submit(); //need to get contents of the iframe $("#postframe").load( function(){ iframeContents = $("iframe")[0].contentDocument.body.innerHTML; $("div#textarea").html(iframeContents); } ); return false; }); }); &lt;/script&gt; </code></pre> <p>I used a php app like this uploader.php to do something with the file:</p> <pre><code>&lt;?php $uploaddir = 'uploads/'; $uploadfile = $uploaddir . basename($_FILES['userfile']['name']); $maxfilesize = $_POST[MAX_FILE_SIZE]; if ($maxfilesize &gt; 5000000) { //Halt! echo "Upload error: File may be to large.&lt;br/&gt;"; exit(); }else{ // Let it go } if (move_uploaded_file($_FILES['userfile']['tmp_name'], $uploadfile)) { print('File is valid, and was successfully uploaded. '); } else { echo "Upload error: File may be to large.&lt;br/&gt;"; } chmod($uploadfile, 0744); ?&gt; </code></pre> <p>There's more there than you need, but it illustrates the concept in jQuery.</p>
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    1. POHow can I pass information to an iframe via Post in ASP.NET?
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    1. POHow can I pass information to an iframe via Post in ASP.NET?
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    1. COWow. All of that code for something so simple? You can use the target attribute of the FORM, correlate it with the name attribute of the IFRAME, and it'll submit naturally!
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      1. USJosh Stodola
    2. CO@Josh, Pop that in an answer with a bit of code then ;)
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      1. USZhaph - Ben Duguid
 

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