Javascript/HTML5 using image to fill canvas

Question

I'm trying to get an image to fill up my canvas. Here is the code I'm trying:

var blueprint_background = new Image();
blueprint_background.src = 'images/blueprint_background.png'; 
var pattern = context.createPattern(blueprint_background, "repeat");

context.fillStyle = pattern;
context.fill();

The issue is that nothing shows up. I was able to do the the basic context.fillRect(..) example, but this is giving me troubles.

Thanks.

Answer 1

You have to wait until the image loads, use the image's onload property to know when it loads.

var blueprint_background = new Image();
blueprint_background.src = 'images/blueprint_background.png'; 
blueprint_background.onload = function(){
    var pattern = context.createPattern(this, "repeat");
    context.fillStyle = pattern;
    context.fill();
};