How do I prevent this JavaScript function from executing.

I have a js function that is causing a serious issue and I am not able to remove nor modify it source. I would like to know if it is possible to simply prevent, stop, or kill the function in order that it is not executed till I resolve the issue.

So somewhere inside the page:

<script type="text/javascript"><!--
problem_func();
//--></script>

And all I want is to stop that function from execution placing a stopper inside the header or external js.

Any advice?

HERE IS THE LIVE EXAMPLE, HOW TO STOP THAT?

How do I prevent this JavaScript function from executing.

I have a js function that is causing a serious issue and I am not able to remove nor modify it source. I would like to know if it is possible to simply prevent, stop, or kill the function in order that it is not executed till I resolve the issue.

So somewhere inside the page:

<script type="text/javascript"><!--
problem_func();
//--></script>

And all I want is to stop that function from execution placing a stopper inside the header or external js.

Any advice?

HERE IS THE LIVE EXAMPLE, HOW TO STOP THAT? http://jsbin.com/uxalag/3

• javascript
• dom
• dom-events

• @Mörre I still see the bad code executed. Did you modify smth? – devjs11 Commented Mar 13, 2012 at 14:46
• 1 You need to place the "overwrite-function" BETWEEN where the "bad" function is declared and where it is invoked. If that is not possible, because both locations are in the same JS file, there is no solution (worth thinking about) for your problem. Oh and by the way - omit those HTML comments from the script tags. We are long past browsers that needed this (that was for Netscape 4 and IE 5 or so). – Mörre Commented Mar 13, 2012 at 14:50
• @Mörre mate, I have an idea but I am not sure if that would help. What if I create function inside header to look foor <script> tag and wipe its innerHTML. Would that make any effect? – devjs11 Commented Mar 13, 2012 at 15:55
• No, it would not work - at that point the browser does not know about any of the not yet parsed tags. I just tried it to be sure, in teh first script tag document.getElementsByTagName("script") only returns that first script tag, in the second script tag it returns the first and the current (2nd) one, etc. So you cannot manipulate any tags below the one you are at during loading. But an interesting idea :-) (not recommended, but interesting) – Mörre Commented Mar 13, 2012 at 17:02

2 Answers 2

If you know the function name, you can replace it with a function that does nothing. After the script tag of the source js file use this:

window.FunctionName=function(){return false;};

Just overwrite it

for example if a function abc() { ..... } causing you problem you can overwrite it with an empty body.

function abc() {  }