Has window.onload fired yet?

Question

I have a script that will be inserted into an unknown page at an unknown time. Is it possible to tell from this script if window.onload has fired yet?

I have no control over the host page. I can't add any markup or scripts to it. All I know is that my script will be inserted into the page at some point. It could be before window.onload or after; and I need to detect which side of that event I'm on.

Answer 1

jQuery's ready() will queue a function to be fired when the document is loaded, or fire immediately if the document is already loaded:

$(document).ready(function() {
    //your code here
});

Just be sure jQuery is included before your script block. If you can't include any script resources directly, you can always copy the body of jQuery-min in your script itself.

Answer 2

Updated Answer: Look at this site. He uses a trick by seeing if the last element of document.getElementsByTagName("*") is defined or not. It seems to work in Opera and IE.

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Original Answer: You can't check, but you can do:

window.setTimeout(function () {
    // do your stuff
}, 0);

That will do your stuff definitely after the page has loaded.