In a browser extension, how do I click a specific button of an alert?

So...

I need to click [Stay on this page] automatically in such a prompt:

Confirm navigation: [Leave this page] [Stay on this page]

The code that invokes this is

$(w开发者_如何学编程indow).bind('beforeunload', function() {
  return 'Leave page?';
  //Click prompt code goes here.
  $(window).unbind();
});

If I take away return 'Leave page?'; then the iframed page overrides the top frame and the user is struck with an unknown site, maybe there's another way to do this?

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Actually that would hook into the onbeforeunload event:

$(window).bind('beforeunload', function() {
      return 'Leave page?';
});

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Instead of automatically clicking it, check if you can automatically disable window.onbeforeunload event handlers. That's most likely much easier than trying to send a click to a specific button in a modal window anyway.

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I agree with Thiefmaster. Alternative is to replace the alert, prompt or confirm if that is what is used:

window.confirm=function() {
  // here you do what you want
}