Prototype and jQuery conflict resolution

This article will guide you how to solve the conflict between jQuery and Prototype to simultaneously, in order to use both libraries on the same web page.

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I experienced this conflict quite recently when I was working on WordPress Featured Articles Plugin. Normally jQuery.noConflict() comes to the rescue but not in my case. And the reason being - prototype was already interacting and was included at the top, so it was already using the $ variable.

This conflict causes the creation of the jQuery object to fail.


All the following errors are related to this conflict and you might get one or all of the following while using Prototype (Scriptaculous) and jQuery -

jQuery is not defined

$ is not a function

$ is not defined $(document).ready(function(){

Component returned failure code: 0×80040111 JavaScript error

uncaught exception: [Exception... "Component returned failure code: 0x80004005 (NS_ERROR_FAILURE) [nsIDOMViewCSS.getComputedStyle]" nsresult: "0×80004005 (NS_ERROR_FAILURE)"

What can we do to fix this?

You can try moving the jQuery.js to top and than use jQuery.noConflict().

If that is not an option you can do the following -


  • Edit prototype.js - find where it defines function $() and change the name to function $$$()
  • Still in prototype.js, carefully replace each occurrence of $(... ) with $$$(... ), but don't touch anything which says $$(... )
  • Edit each of the other *.js files (e.g. effects.js) and carefully replace each occurrence of $(... ) with $$$(... ), but don't touch anything which says $$(... ).
  • That is it.

And just in case you have trouble doing the above, Following links point to already edited prototype.js and effects.js. Please remember all the references to these files must start with $$$ instead of $.

Download - Prototype.js

Download - Effects.js

Hopefully this article will help some of our fellow coders and save them some time and frustration. Happy Coding guys :)

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