Fallback image and timeout - External Content. Javascript

Question

What is the best way to set up a local fallback image if the external image does not load or takes too long to load.

Answer 1

You can add an onerror handler:

<img
  src="http://example.com/somejpg.jpg"
  onerror='this.onerror = null; this.src="./oops.gif"'
/>

Note: Setting onerror to null in the handler, so that the webpage doesn't crash if oops.gif can't be loaded for some reason.

Answer 2

Try to make use of the Image.complete property.

var img = new Image(w,h)
img.src = "http://...";

Now check periodically if img.complete is true and call some fallback mechanism shuold it still be false after n seconds.