Drag and drop functionality for "requirements.txt" files for http://python3wos.appspot.com/ Tested in latest Google Chrome and Firefox-

gistfile1.js

(function(){

  document.addEventListener("drop", function( e ) {
		e.preventDefault();
		var blob = e.dataTransfer.files[0].slice();	
		var binaryReader = new FileReader();
		$('.req').removeClass('.req');
		binaryReader.addEventListener("load", function( file ) {		
			var notFound = '';
			file.target.result.trim().replace(/==.*/g,'').split(/\n/).forEach(function(pack){
				$('#'+pack).addClass('req').add('tr:first').prependTo('table');
				if($('#'+pack).length === 0){
					notFound += pack + "\r\n";
				}
			});
			if(notFound){
				var warning = "There is no data about this packages: " + notFound;
				alert(warning);
				console.log(warning);
			}
			window.scrollTo(0,0);
		});
		binaryReader.readAsText( blob, 'UTF-8' );
	}, false);

	// Firefox...
	document.addEventListener("dragover", function( e ) {
		e.preventDefault();
	}, false);

	$('<style>' +
		'.req::after{ ' +
			'content: "ʘ"; ' +
			'position: absolute; ' +
			'color: #FFCF99; ' +
			'margin-top: 13px; ' +
			'margin-left: -280px; ' +
			'font-size: 11px; ' +
		'} ' +
		'</style>').appendTo('head');

})();