NS_ERROR_NOT_AVAILABLE: Component is not available

Question

I have a problem. I am trying to draw an image onto a canvas. The image is not from the HTML page, but on a file. Here is the code i use:

var img = new Image         


        

Answer 1

You need to wait for the image to load before attempting to draw it into a canvas:

var img = new Image();
img.src = "/images/logo.jpg";
img.onload = function () {
  this._canvas.drawImage(img, 300, 300);// this is line 14
}