NPM module that allows you to get multiple jQuery instances that are "detached" from the global namespace (window) i.e. different versions of jQuery and/or multiple instances of the same version.

Install Package:

npm install --save jquery-detached-<jquery-version>

Of course, the above will depend on whether or not we have published that exact version of jquery. The easiest way to see the versions we have published is to look at the branch names on GutHub

Motivation

Having run into issues using a single shared jQuery instance across multiple libraries/apps running a browser, each requiring different versions of jQuery, or unwittingly polluting the shared jQuery instance with extensions that conflict with each other.

Getting a shared jQuery instance

Creating multiple instances of jQuery should be avoided if possible, but only when that shared instance is not being polluted. When running in an environments where it is known to be safe to use a shared jQuery instance e.g. a closed environment, where everything is controlled (extensions etc), or in an environment where this shared instance is not modified through extension.

var jQuery = require('jquery-detached-<jquery-version>');
var $ = jQuery.getJQuery();

var myDivs = $('.myDivs');

// etc...

Getting a "new" jQuery instance

This is intended for use only with libraries that extend jQuery (e.g. Twitter Bootstrap, jQuery UI), allowing them to get a clean jQuery instance to extend. This should then allow these libraries to work in isolation from each other in environments where multiple libraries and frameworks need to be able to co-exist e.g. in the Jenkins CI ecosystem, where there are 1000+ plugins, any of which may be using a variety of different JavaScript libraries that depend on jQuery (and different versions of jQuery).

var jQuery = require('jquery-detached-<jquery-version>');
var $ = jQuery.newJQuery();

//
// Do something with your jQuery/$ instance. See notes below.
// 

As regards what needs to be done with your $, you probably need to perform a noConflict equivalent operation. Here are some random thoughts:

• backup the existing jQuery and $ globals, if any (ala noConflict)
• set your $ on window.$ and window.jQuery
• "statically" initialise your library, allowing it to glom onto your $ instance
• save you $ somewhere that you can ref it again easily e.g. some other special/private namespace
• restore the global namespace to its original state (ala noConflict)