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  1. PO
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    <p>Assuming you have a handle on the server side.. here is a small function and example on how to implement the 'iframe hack' in javascript. </p> <p><strong>html</strong> </p> <pre><code>&lt;form name="image-upload"&gt; &lt;input type="file" name="image" /&gt;&lt;/br&gt; &lt;button type="submit" name="upload"&gt;Upload&lt;/button&gt; &lt;div id="upload-results"&gt;&lt;/div&gt; &lt;/form&gt; </code></pre> <p><strong>javascript</strong> </p> <pre><code>var fileUpload = function(form /* HTMLElement */, action /* Form Action URL */, callback /* Callback function */) { /* vars */ var atribs = { "target": "upload_iframe", "action": action, "method": "post", "enctype": "multipart/form-data", "encoding": "multipart/form-data" }, iframe; /* iframe listener */ var ilistener = function() { var results; listener.remove(this, 'load', ilistener); if( 'contentDocument' in this ) { results = this.contentDocument.body.innerHTML; } else if ( 'contentWindow' in this ) { results = this.contentWindow.document.body.innerHTML; } else if ( 'document' in this ) { results = this.document.body.innerHTML; } else { throw "i'm dead jim :/"; } callback.apply(this,[results]); // call the callback, passing the results this.parentNode.removeChild(this); // remove the iframe }; /* create the iframe */ form.parentNode.appendChild(FragBuilder([{"tagName": "iframe","id": "upload_iframe","name": "upload_iframe","style": {"height": "0","width": "0","border": "0"}}])); /* collect the iframe back */ iframe = By.id('upload_iframe'); /* set the form properties */ for( var attr in atribs ) { if( attr in form ) { form[attr] = atribs[attr]; } } /* attach the event listener to the iframe */ listener.add(iframe, 'load', ilistener); /* submitting the form */ form.submit(); }; // get the form, and the results area var form = document.forms['image-upload'], results = By.id('upload-results'); // listen for the form submit, capture it, and run the iframe upload. listener.add(form, 'submit', function(e) { e.preventDefault(); results.innerHTML = 'Uploading...'; fileUpload(this, 'server.php' /* really anything */, function(data) { console.log(data); results.innerHTML = "Uploaded!"; }); }); </code></pre> <p>Please note: for simplicity purposes I have used the following utilities. <a href="https://github.com/rlemon/FragBuilder.js" rel="nofollow">https://github.com/rlemon/FragBuilder.js</a> DocumentFragment builder from JSON input.<br> <a href="https://gist.github.com/2172100" rel="nofollow">https://gist.github.com/2172100</a> event listener, and By utility functions.<br> *these are both easily removed. </p>
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    1. POimage upload with ajax and php
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    1. USrlemon
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    1. COI realize this is three years past the fact.. but I came upon this while searching. So I figure others may as well. Here is you're 2012 answer
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    2. COI'm getting an error "ReferenceError: By is not defined" "var form = document.forms['image-upload'], results = By.id('upload-results');"
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      1. USGoldie
    3. COUtility functions need to be included as well. see the notes below the code. or change By.id to document.getElementById
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