jussi-kalliokoski/inline-worker.html

## inline-worker.html
<!DOCTYPE html>
<html>
	<head>
		<script src="inline-worker.js"></script>
		</script>
	</head>
	<body>
		<div id="log"></div>
		<script>
inlineWorker.onready(function(){

	if (inlineWorker.working) {
		console.log('It works');
		console.log('Worker type: ' + inlineWorker.type);
	} else {
		console.log('It doesn\'t work.');
	}

});

inlineWorker.onready(function(){
	var	log	= document.getElementById('log'),
		worker	= inlineWorker.working && inlineWorker('var x = 0; setInterval(function(){ postMessage("Hello, I am inside your Worker, sending messages. #" + x++); }, 1000);');
	if (worker) {
		worker.onmessage = function (e) {
			log.innerHTML = e.data;
		};
	} else {
		log.innerHTML = 'Failed to create the worker :(';
	}
});

</script>

	</body>
</html>

## inline-worker.js
var inlineWorker = (function(){

var	BlobBuilder	= typeof window === 'undefined' ? undefined :
	window.MozBlobBuilder || window.WebKitBlobBuilder || window.MSBlobBuilder || window.OBlobBuilder || window.BlobBuilder,
	URL		= typeof window === 'undefined' ? undefined : (window.MozURL || window.webkitURL || window.MSURL || window.OURL || window.URL);

/**
 * Creates an inline worker using a data/blob URL, if possible.
 *
 * @arg {String} script
 *
 * @return {Worker} A web worker, or null if impossible to create.
*/

function inlineWorker (script) {
	var	worker	= null,
		url, bb;
	try {
		bb	= new BlobBuilder();
		bb.append(script);
		url	= URL.createObjectURL(bb.getBlob());
		worker	= new Worker(url);

		worker._terminate	= worker.terminate;
		worker._url		= url;
		bb			= null;

		worker.terminate = function () {
			this._terminate;
			URL.revokeObjectURL(this._url);
		};

		inlineWorker.type = 'blob';

		return worker;

	} catch (e) {}

	try {
		worker			= new Worker('data:text/javascript;base64,' + btoa(script));
		inlineWorker.type	= 'data';

		return worker;

	} catch (e) {}

	return worker;
}

inlineWorker.ready = inlineWorker.working = false;

inlineWorker.events = [];

inlineWorker.test = function () {
	var	worker	= inlineWorker('this.onmessage=function(e){postMessage(e.data)}'),
		data	= 'inlineWorker';

	inlineWorker.ready = inlineWorker.working = false;

	function ready(success) {
		if (inlineWorker.ready) return;
		inlineWorker.ready	= true;
		inlineWorker.working	= success;
		while (inlineWorker.events.length) {
			inlineWorker.events.shift()();
		}
		success && worker && worker.terminate();
		worker = null;
	}

	if (!worker) {
		ready(false);
	} else {
		worker.onmessage = function (e) {
			ready(e.data === data);
		};
		worker.postMessage(data);
		setTimeout(function () {
			ready(false);
		}, 1000);
	}
};

inlineWorker.onready = function (callback) {
	inlineWorker.ready ? callback() : inlineWorker.events.push(callback);
};

inlineWorker.test();

return inlineWorker;

}());
	<!DOCTYPE html>
	<html>
	<head>
	<script src="inline-worker.js"></script>
	</script>
	</head>
	<body>
	<div id="log"></div>
	<script>
	inlineWorker.onready(function(){

	if (inlineWorker.working) {
	console.log('It works');
	console.log('Worker type: ' + inlineWorker.type);
	} else {
	console.log('It doesn\'t work.');
	}

	});

	inlineWorker.onready(function(){
	var log = document.getElementById('log'),
	worker = inlineWorker.working && inlineWorker('var x = 0; setInterval(function(){ postMessage("Hello, I am inside your Worker, sending messages. #" + x++); }, 1000);');
	if (worker) {
	worker.onmessage = function (e) {
	log.innerHTML = e.data;
	};
	} else {
	log.innerHTML = 'Failed to create the worker :(';
	}
	});

	</script>

	</body>
	</html>
	var inlineWorker = (function(){

	var BlobBuilder = typeof window === 'undefined' ? undefined :
	window.MozBlobBuilder \|\| window.WebKitBlobBuilder \|\| window.MSBlobBuilder \|\| window.OBlobBuilder \|\| window.BlobBuilder,
	URL = typeof window === 'undefined' ? undefined : (window.MozURL \|\| window.webkitURL \|\| window.MSURL \|\| window.OURL \|\| window.URL);

	/**
	* Creates an inline worker using a data/blob URL, if possible.
	*
	* @arg {String} script
	*
	* @return {Worker} A web worker, or null if impossible to create.
	*/

	function inlineWorker (script) {
	var worker = null,
	url, bb;
	try {
	bb = new BlobBuilder();
	bb.append(script);
	url = URL.createObjectURL(bb.getBlob());
	worker = new Worker(url);

	worker._terminate = worker.terminate;
	worker._url = url;
	bb = null;

	worker.terminate = function () {
	this._terminate;
	URL.revokeObjectURL(this._url);
	};

	inlineWorker.type = 'blob';

	return worker;

	} catch (e) {}

	try {
	worker = new Worker('data:text/javascript;base64,' + btoa(script));
	inlineWorker.type = 'data';

	return worker;

	} catch (e) {}

	return worker;
	}

	inlineWorker.ready = inlineWorker.working = false;

	inlineWorker.events = [];

	inlineWorker.test = function () {
	var worker = inlineWorker('this.onmessage=function(e){postMessage(e.data)}'),
	data = 'inlineWorker';

	inlineWorker.ready = inlineWorker.working = false;

	function ready(success) {
	if (inlineWorker.ready) return;
	inlineWorker.ready = true;
	inlineWorker.working = success;
	while (inlineWorker.events.length) {
	inlineWorker.events.shift()();
	}
	success && worker && worker.terminate();
	worker = null;
	}

	if (!worker) {
	ready(false);
	} else {
	worker.onmessage = function (e) {
	ready(e.data === data);
	};
	worker.postMessage(data);
	setTimeout(function () {
	ready(false);
	}, 1000);
	}
	};

	inlineWorker.onready = function (callback) {
	inlineWorker.ready ? callback() : inlineWorker.events.push(callback);
	};

	inlineWorker.test();

	return inlineWorker;

	}());