Refresh page after delay

Question

I'm catching the page close/refresh event by following code:

window.onbeforeunload = function(){
  jQuery("#submit_form_button").click();
  jQuery("#saving_loader").show();
};

Here, the line jQuery("#submit_form_button").click();sends a request to controller#update method and saves the form before reload. The only problem is, it works sometimes and sometimes not. Specifically I'm seeing this problem in Chrome.

So I want to delay the refresh process. It should happen after click() event. I tried setTimeout() but it doesn't work.

Any suggestions?