Multiple jQuery Versions on a Single Page

When integrating a jQuery-dependent widget into customers' web pages, a challenge arises if they are already using an outdated version of jQuery. Ensuring compatibility while avoiding interference with their existing code becomes crucial.

Fortunately, jQuery provides a solution through its noConflict mode. This allows you to load multiple versions of the library without conflict.

Code Implementation

To achieve this:

1. Load the older version of jQuery (if present):
2. Load the newer version (our own):

3. Use $.noConflict(true) after each load to prevent $. from referring to the conflicting library:

   • var $oldJquery = $.noConflict(true);
   • var $newJquery = $.noConflict(true);

4. Use $oldJquery or $newJquery as needed to distinguish between versions:

   • $oldJquery('#old-selector').function();
   • $newJquery('#new-selector').function();

Advantages:

• No interference: Each jQuery version operates independently, not affecting the other.
• Version-specific handling: You can target specific versions using the distinct $ aliases ($oldJquery, $newJquery).
• Compatibility: It allows our widget to use newer jQuery features while still supporting older customer versions.

By using noConflict mode, you can effectively use multiple jQuery versions on the same page, ensuring compatibility and avoiding conflicts with the customer's existing code.