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POHow to POST a file (from File API) from drag and drop
 

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  1. POHow to POST a file (from File API) from drag and drop
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    <p>I have a file-upload page where the file is selected via drag and drop. Because the file is dropped in (rather than using a traditional field), I have the file exposed to me through the javascript File API.</p> <p>I've been reading <a href="https://developer.mozilla.org/en/Using_files_from_web_applications" rel="nofollow">this article from Mozilla</a>, but I am not all that interested in asynchronously uploading it (as I have some other data that needs to be submitted with the file, but all the resources I have managed to find are doing it with XHR.</p> <p>Here's what I've managed to piece together:</p> <pre><code>function handleFileSelect(evt) { evt.toElement.className = ""; evt.stopPropagation(); evt.preventDefault(); var files = evt.dataTransfer.files; // FileList object. // files is a FileList of File objects. List some properties. var output = []; for (var i = 0, file; file = files[i]; i++) { var f = file; var reader = new FileReader(); reader.onload = function(e) { var bin = e.target.result; // bin is the binaryString }; reader.readAsBinaryString(file); var xhr = new XMLHttpRequest(); xhr.open("POST", "{% url micro-upload %}"); xhr.overrideMimeType('text/plain; charset=x-user-defined-binary'); xhr.sendAsBinary(bin); output.push('&lt;li&gt;&lt;strong&gt;Uploaded:&lt;/strong&gt;&lt;em&gt;', escape(f.name), '&lt;/em&gt; (', f.type || 'n/a', ') - ', f.size, ' bytes, last modified: ', f.lastModifiedDate ? f.lastModifiedDate.toLocaleDateString() : 'n/a', '&lt;/li&gt;'); } document.getElementById('list').innerHTML = '&lt;ul&gt;' + output.join('') + '&lt;/ul&gt;'; } </code></pre> <p>However server side, Django does not like this. It complains about malformed POST data.</p> <p>Ideally, my solution I think would be this:</p> <ol> <li>User drag-and-drops file onto page</li> <li>File is added to a hidden file <code>&lt;input&gt;</code></li> <li>File is POSTed along with the rest of the form data.</li> </ol> <p>I am aware that most browsers let you drag files onto a file <code>&lt;input&gt;</code>, but I want to have a larger drop target with custom styling. </p>
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