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POJquery File Upload Hidden IFrame
 

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    <p>I needed a quick explanation on how to get an AJAX style file upload going using a hidden iframe. Here's the portion of the HTML code pertaining to the form:</p> <pre><code>&lt;div id = "file" class = "info"&gt; &lt;form id="file_upload_form" method="post" enctype="multipart/form-data" action='script/uploadScript'&gt; &lt;input name="file" id="file" size="27" type="file" /&gt;&lt;br /&gt; &lt;input id = "uploadSubmit" type="submit" name="action" value="Upload" /&gt; &lt;iframe id="upload_target" name="upload_target" src="" style="width:0;height:0;border:0px solid #fff;"&gt;&lt;/iframe&gt; &lt;/form&gt; &lt;/div&gt; </code></pre> <p>Here's the relevant PHP:</p> <pre><code>public function uploadScript(){ $returnVals = array(); if ($_FILES["file"]["error"] &gt; 0){ $returnVals['error'] = "Error: " . $_FILES["file"]["error"] . "&lt;br /&gt;"; }else{ if ($_FILES["file"]["type"] != "text/plain"){ $returnVals['error'] = "Badtype"; }else{ $returnVals['text'] = file_get_contents($_FILES["file"]["tmp_name"]); } } echo json_encode($returnVals); } </code></pre> <p>So, essentially, the PHP gets the file and checks if it's a text file. Then, I want to access the returned json within javascript. That's where I get confused...</p> <pre><code>$("#file_upload_form").submit(function() { $("#file_upload_form").target = "upload_target"; $("#upload_target").onload = uploadDone(); }); </code></pre> <p>Ideally, when the upload is complete and the iframe is loaded, this should call</p> <pre><code>function uploadDone() { alert($("#upload_target").contents().find("body").text()); } </code></pre> <p>But, that's always blank. Essentially, the returnVals are placed into the iframe body, but after the alert, so the alert has nothing in it. So, is there a way to remedy this little flaw? </p> <p>Is there any better explanation on how to do this? I've been banging my head against it with different sample codes and etc all day with no luck :/ </p> <p>I essentially want to be able to alert the text returned via the php code. Btw, I'm doing it this way because I want it to be able to work on IE7 and all browsers after. </p> <p>I'd appreciate any help a ton. Thanks for the time!</p>
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    1. COwhat is the iframe for exactly?
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    2. COJust as an aside, you have invalid html on this line: `<input id = "uploadSubmit"`; there isn't supposed to be a space between those characters.
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    3. COThe Iframe is there for an Ajax style upload. Essentially, I want to use the iframe to upload the file so the whole page doesn't have to load.
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