Codesnippet for chunked fileupload via socket.io and js file api ( clientside )

gistfile1.js

try {
			// Check for the various File API support.
			if (window.File && window.FileReader && window.FileList && window.Blob) {
				var file = $('#file').get(0).files[0];
				if(file.type.search(/^audio\//) == -1) {
					alert('Please upload an audio file.');
				}
				
				// change 
				window.location.hash = '#!newEpisode/upload';
				
				// read audio file
				var reader = new FileReader();
				
				// event triggered wghen the file is loaded
				reader.onload = function(fev) {
					
					var chunkIndex = 0; // current index to start rading file
					var chunkIndexEnd = chunkIndex + 5000; // send 5000 bits per message
					var fileBiteLength = fev.target.result.length;
					
					// called when the server is ready to get the data
					episodeSock.once('serverUploadReady', function(){
						var isEnd = false;
						if(chunkIndexEnd >= fileBiteLength) {
							chunkIndexEnd -= (chunkIndexEnd - fileBiteLength);
							isEnd = true;
						}
						var chunk = fev.target.result.slice(chunkIndex, chunkIndexEnd);
						
						chunkIndex += chunkIndexEnd; // increment current file pointer
						chunkIndexEnd += 5000; // send 5000 bits per message
						
						episodeSock.emit('clientUplaodChunk', {
							chunk : chunk,
							end : isEnd
						});
					});
					
					// called when the server has recieved a complete file and is ready for the metadata
					episodeSock.once('serverUploadComplete', function(data){
						episodeSock.emit('add', {
							sid : sid,
							name : $('#name').val(),
							description : $('#description').val(),
							file : data.fileid
						});
					});
					
					// send notice to server that a fileupload is coming in
					episodeSock.emit('clientUplaodReady', {
						sid : sid,
						filename : file.name
					});
				};
				
				reader.readAsBinaryString(file);
			} else {
				alert('Sorry, but you need a moder browser with file api to upload files.');
			}
		} catch(e) {
			return;
		}