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I'm having problems with jQuery and a plugin, the console error says jQuery is not defined. What I don't understand is it only fails when I load it to the production server, on my local dev installation it worked perfectly.

ReferenceError: jQuery is not defined.

The plugin code:

add_filter( 'wp_footer', 'enqueue_footer_scripts', 9);
add_filter( 'wp', 'enqueue_styles', 11);

function enqueue_footer_scripts() {
    wp_register_script( 'sjs', plugins_url('/js/sjs.js', __FILE__), array('jquery'));
    wp_enqueue_script( 'sjs' );
    echo "<script>jQuery(document).ready(function ($) { $('p').sJS();});</script>"; 

function enqueue_styles() {
    wp_register_style('sjcss', plugins_url('/css/sjs.css', __FILE__), false, '2.1');
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You are doing it wrong. use wp_enqueue_scripts. Check the code for functions.php you posted. Its the proper way to enqueue script. – Sisir Mar 11 '14 at 9:20
Please don't shout that much. Also don't use tags in the body of your question. – Pieter Goosen May 22 '14 at 7:15
up vote 2 down vote accepted

Your code doesn't work because of a fundamental ordering problem.

You're hooking into wp_footer. Then you're registering a script and enqueueing it. Finally, you echo some code.

Here's the problem, the act of enqueueing a script does not cause an echo of the script code immediately. Enqueueing does just what it says, it sets the script up to be added to the page output at a later time. So your echo of the script code here is too early.

Specifically, the enqueued scripts for the footer happen in the wp_print_footer_scripts call, which is connected to the wp_footer action with priority 20. So you need to enqueue before then, but print your custom script code after then.

So make a new function. Hook it to the wp_print_footer_scripts action. Then move your echo code into that, but leave the enqueue code where it is.

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Straight from the Codex this is how to load a script:

function my_scripts_method() {
    wp_enqueue_script( 'social-highlighter-js', plugins_url('/js/social-highlighter.js', __FILE__), array('jquery'));

add_action( 'wp_enqueue_scripts', 'my_scripts_method' );

Then print your custom initialization scripts in the footer:

add_filter( 'wp_print_footer_scripts', 'my_wp_print_footer_scripts' );

function my_wp_print_footer_scripts() {
    echo "<script>jQuery(document).ready(function ($) { $('p').socialHighlighterShare();});</script>";  
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