html - Set Canvas size using javascript

Question

I have the following code in html:

<canvas  id="myCanvas" width =800 height=800>

I want, instead of specifying the width as 800, to call the JavaScript function getWidth() to get the width e.g.

 <canvas  id="myCanvas" width =getWidth() height=800>

What is the correct syntax to do it? Because what I'm doing doesn't work.

Answer 1

You can set the width like this :

function draw() {
  var ctx = (a canvas context);
  ctx.canvas.width  = window.innerWidth;
  ctx.canvas.height = window.innerHeight;
  //...drawing code...
}