Plugin jQuery version VS Theme jQuery version: search for best practice

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I have built a WordPress plugin that is based on jQuery and I am using
wp_enqueue_script('jquery');
to make it all work.

Let say the default version of jQuery loaded by WordPress is 1.7.2, what would happen if the users installs a theme based on a different version of jQuery?

  1. What version of jQuery will run in the page where the plugin is called: the default version of jQuery (as I’m using wp_enqueue_script(‘jquery’)) or the version of jQuery called in theme?

  2. I can’t figure out what version of jQuery will be used if a page includes multiple plugins and if each one of theme uses a different of jQuery? Will everything mix up and end up in conflicts?

Thanks for your help

3 Answers
3

As other have mentioned , there is no great answer to this, ultimately you cannot control how other people write plugins/themes and there are no standards for naming wp_enqueue_script‘s, though there probably should be.

Also there is no current way to check if jQuery is loaded using wp_enqueue_script, though this is very easy to do at the template level with something like window.jQuery.

Some notes, since this gets bit weird:

Scenario 1 – Same name

If you use the name jquery to enqueue your script, for example: 

wp_enqueue_script( 'jquery', '/ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js');

It will not enqueue ^ this link , but instead use the default WordPress bundled jQuery which is:

wp-includes/js/jquery/jquery.js?ver=x.x.x (latest bundled)

The reason is your using the same name, a name registered by WordPress first.

Scenario 2 – Diff name

If you use a different name, for example:

wp_enqueue_script( 'jquery-hi','/ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js');

It will just enqueue jquery-hi and not the bundled WordPress jQuery.

Scenario 3 –Multiple names

If you have several plugins/themes using different names, such as:

wp_enqueue_script( 'jquery-hi','/ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js');
wp_enqueue_script( 'jquery-pie','/ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js');

It will enqueue both of them.

ps. Don’t load your own jQuery (or other bundled wp script) in the admin, ever.

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