I want to use jQuery in a plugin. In functions.php of the theme I'm using, I found:

if(!is_admin()) {
        wp_register_script('jquery', 'http://ajax.googleapis.com/ajax/libs/jquery/1.5.0/jquery.min.js');

As I understand it, this loads jQuery and I'm ready to go. All I have to do is add this to my plugin's javascript file:

jQuery(document).ready(function($) {

    //put jquery code here


A) Is that it? Am I missing anything?

I did not see this in the header.php:

<?php wp_enqueue_script('jquery');?>
<?php wp_head(); ?>

B) I'd also like to use jquery-ui. In a plugin that came with the theme, I found:


Do I simply do the same as above in own plugin? And then call it in my js file as:



What if I want to use other bits of the jQuery-UI library? How can I tell which parts of jQuery-UI are included in the theme?

Sorry for the basic questions. I want to make sure that I'm set-up properly and I understand what's going on.

Additional Info:

Let's say I've got a plugin called "myplugin". The plugin works. But, I want to add some jQuery functionality. In myplugin's main function I add:

wp_enqueue_script('myplugin_script', 'http://mysite/wp-content/plugins/myplugin/js/myplugin_script.js');

In myplugin_script.js, I have:


jQuery(document).ready(function($) {                

Why isn't the alert popping up? Do I need to add the script to a hook? Or will wp_enqueue_script cause it to fire?

Thank you.


1 Answer 1


First of all, if your code (or the theme's code) is unregistering jQuery and re-registering it from another location (Google), you need to add this somewhere:


This makes jQuery cooperate with other scripts (i.e. Prototype) that try to define the $ variable globally. WordPress has this line bundled into their version, Google does not.

If you need to enqueue jQuery and a bunch of jQuery UI stuff, you'll need to do that.

function my_enqueue() {
add_action( 'wp_enqueue_scripts', 'my_enqueue' );

This will hook your enqueues to the appropriate action that will output them in the header. I'm assuming that the jQuery UI scripts are already registered within WordPress.

  • is not jQuery(document).ready(function($) {}) already no-conflict mode?
    – Mamaduka
    Sep 2, 2011 at 16:44
  • That itself is written as to not conflict with other scripts, but you still have to call jQuery.noConflict() to release jQuery's hold on the global $ variable. See the official jQuery docs for details ...
    – EAMann
    Sep 2, 2011 at 16:54
  • 1
    Hi EAMann, Thank you very much for your detailed message. Sorry, I'm still struggling a bit. I'll add some more info to my question in a sec.
    – Laxmidi
    Sep 2, 2011 at 21:05

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