link to JS library using wp_enqueue_scripts not working

Question

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.

Answer 1

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

wp_enqueue_script('fullpage-slimscroll');

Answer 2

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
        'fullpage-slimscroll',
        $slimscroll,
        array('jquery'), // dependency
        null
    );
    //some more files will be added here later
}
add_action("wp_enqueue_scripts", "fullpagejs");