Question

I know I cannot check the content in an iframe that contains 3rd party web page.

All I want is simple, when I create an iframe, I want to get a callback when the page triger onload, or starts to render, or domready, or other events which I can know the URL is working (is not a dead link)

Anyidea which events should I hook to?

Answer 1

You could try:

var iframe = document.getElementById("the_frame");
iframe.onload = function () {
    alert("hey man!");
}