ConvertToBase64

/**
 * Converts an image to a base64 string
 * Param[in] : url, the path to the image
 */
function toBase64(url) {
    var canvas = document.createElement("canvas");
    var ctx = canvas.getContext('2d');
        var img = new Image();
        img.src = url;
        var height = img.height, width = img.width;
    canvas.height = height;
    canvas.width = width;
    ctx.drawImage(img, 0, 0, width, height);
    try {
        var dataURL = canvas.toDataURL("image/jpg");
        return dataURL.replace(/^data:image\/(png|jpg);base64,/, "");
    }
    catch (err) { console.log("ERROR " + err);}
 }