quick and dirty image to base64 datastring.js

// spotted @ https://davidwalsh.name/convert-image-data-uri-javascript
function getDataUri(url, callback) {
	var image = new Image();

	image.onload = function () {
		var canvas = document.createElement("canvas");
		canvas.width = this.naturalWidth;
		canvas.height = this.naturalHeight;

		canvas.getContext("2d").drawImage(this, 0, 0);

		var dataUrl = canvas.toDataURL("image/png");
		callback(dataUrl);
	};

	image.src = url;
}

// use it like
getDataUri("url/to/image", function(dataUrl) {
	// do something with dataUrl
	console.log(dataUrl);
});