I've added the following code to functions.php of my activated child theme:

function fullpagejs() {
    $slimscroll = get_stylesheet_directory_uri() . '/library/fullPage.js-master/vendors/jquery.slimscroll.min.js' ;
    wp_register_script('fullpage-slimscroll', $slimscroll, false, null);
    //some more files will be added here later
add_action("wp_enqueue_scripts", "fullpagejs");

However when I check the page source, I can't find the script jquery.slimscroll.min.js registered.


You must not only register the script, but also enqueue it after that, like this:

  • Pleased to help you. Could you accept the answer by clicking on the "check" to the left. So everybody knows this question doesn't need attention anymore. – cjbj May 17 '16 at 14:01
  • Actually, there is no need to register the script before enqueueing. – Max Yudin May 17 '16 at 14:04
  • @Max Possibly, but there could also be reasons to do both: wordpress.stackexchange.com/questions/82490/… – cjbj May 17 '16 at 14:08
  • @MaxYudin according to WordPress, 'Registering scripts is technically not necessary, but highly recommended nonetheless.' so you're right, not needed but as the script has some dependencies (jquery) I will add it. – Luiza Rios May 17 '16 at 14:09
  • @cjbj sure, I'm a noobie so I wasnt sure how to signal the code worked. I've ticked it now :) – Luiza Rios May 17 '16 at 14:10

You are registering the script instead on enqueueing.

Also, slimScroll depends on jQuery. So you have to point it out explicitly.

function fullpagejs() {
    $slimscroll = get_stylesheet_directory_uri() . '/library/fullPage.js-master/vendors/jquery.slimscroll.min.js' ;
    wp_enqueue_script( // see here
        array('jquery'), // dependency
    //some more files will be added here later
add_action("wp_enqueue_scripts", "fullpagejs");
  • You're right Max, I hadn't read your answer when I replied to the other one above. In fact, to make things harder, this scripts has another dependency which I also have to add to the website, so here's how the final code is looking: – Luiza Rios May 17 '16 at 14:22
  • code function fullpagejs() { wp_enqueue_script('jquery-ui', 'ajax.googleapis.com/ajax/libs/jqueryui/1.9.1/…); $slimscroll = get_stylesheet_directory_uri() . '/library/fullPage.js-master/vendors/jquery.slimscroll.min.js' ; wp_register_script('fullpage-slimscroll', $slimscroll, array ('jquery', 'jquery-ui'), null); wp_enqueue_script('fullpage-slimscroll'); //some more files will be added here later } add_action("wp_enqueue_scripts", "fullpagejs");code – Luiza Rios May 17 '16 at 14:23
  • @LuizaRios If you want to use external libraries you have deregister native WP libraries first. jQuery and jQuery-UI are native. See the list here – Max Yudin May 17 '16 at 14:47
  • I don't want to use external libraries, I checked that list before but I couldn't find simple jquery-ui (although I did see dozens of jquery-ui-something) so I assumed this one had to be brought in manually, is that not the case? Can I just leave code array ('jquery', 'jquery-ui') code without first having to bring in the script? – Luiza Rios May 17 '16 at 14:59
  • @LuizaRios You had to look for jquery-ui-core in that list. array ('jquery', 'jquery-ui-core') – Max Yudin May 17 '16 at 15:09

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