QR Code Javascript

//function javascript
function create_qrcode(text,targetImageID) {


  var dotsize = 5;
  var padding = 10;
  var black = "rgb(0,0,0)";
  var white = "rgb(255,255,255)";
  var QRCodeVersion = 15;

    var canvas=document.createElement('canvas');
    var qrCanvasContext = canvas.getContext('2d');
  try {
    var qr = new QRCode(QRCodeVersion, QRErrorCorrectLevel.L);
    qr.addData(text);
    qr.make();
   }
  catch(err) {
        var errorChild = document.createElement("p");
    var errorMSG = document.createTextNode("QR Code FAIL! " + err);
    errorChild.appendChild(errorMSG);
    return errorChild;
  }

  var qrsize = qr.getModuleCount();
    canvas.setAttribute('height',(qrsize * dotsize) + padding);
    canvas.setAttribute('width',(qrsize * dotsize) + padding);
    var shiftForPadding = padding/2;
    if (canvas.getContext){
        for (var r = 0; r < qrsize; r++) {
            for (var c = 0; c < qrsize; c++) {
                if (qr.isDark(r, c))
                    qrCanvasContext.fillStyle = black;
                else
                    qrCanvasContext.fillStyle = white;
                qrCanvasContext.fillRect ((c*dotsize) +shiftForPadding,(r*dotsize) + shiftForPadding,dotsize,dotsize);
            }
        }
    }

    var imgElement = document.createElement("img");
    imgElement.src = canvas.toDataURL("image/png");
    $("#"+targetImageID).attr('src',imgElement.src);

}

//Cara penggunaan

<img id="tes"/>

<script>
$(function () {
    create_qrcode('123123123123','tes');
});
</script>