How to avoid the Unresponsive Script popup in Firefox with long running Javascript?

Question

I want to benchmark some Javascript code in the browser, but it may trigger Firefox\'s \"Warning: Unresponsive script\" popup. This allows the user to click \"Stop script\"

Answer 1

You have to break up long actions into smaller ones and perform them in turns. This will also allow a better progress indication.

http://www.sonofsofaman.com/hobbies/code/settimeout.asp

Answer 2

The below code solved that problem for me...

<script type="text/javascript">
   function downloadJSAtOnload() {
   var element = document.createElement("script");
   element.src = "deferredfunctions.js";
   document.body.appendChild(element);
   }
   if (window.addEventListener)
   window.addEventListener("load", downloadJSAtOnload, false);
   else if (window.attachEvent)
   window.attachEvent("onload", downloadJSAtOnload);
   else window.onload = downloadJSAtOnload;
</script>

Answer 3

You can use the script from this question to break processing long lists into smaller chunks:

How can I give control back (briefly) to the browser during intensive JavaScript processing?

Answer 4

See in blog of Nicholas C. Zakas What determines that a script is long-running? (at 2009/01/05)

Speed up your JavaScript, Part 1 http://www.nczonline.net/blog/2009/01/13/speed-up-your-javascript-part-1/

there are the reasons and the ways how to avoid the dialog

Answer 5

In firefox's address bar type about:config

You want to change dom.max_script_run_time to be large enough for your scripts to run.