4

This is what I'm using to make sure that I have jquery-ui-core available:

if (!is_admin()) add_action('wp_enqueue_scripts', 'zg_load_scripts');
function zg_load_scripts(){
    wp_enqueue_script("jquery-ui-core");
}

I also tried wp_enqueue_script("jquery-ui-core", null, null, false, false); in a vain attempt to force it into the header. No dice. What's going on here?

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8

Why do you need it in the header?

It's enqueuing in the footer because when it was registered it was set to enqueue in the footer.

In wp-includes/script-loader.php:

$scripts->add( 'jquery-ui-core', '/wp-includes/js/jquery/ui.core.js', array('jquery'), '1.8.12' );
$scripts->add_data( 'jquery-ui-core', 'group', 1 );

The second line forces it to load in the footer. You could deregister the script, then re-enqueue it in the header:

<?php
add_action('wp_enqueue_scripts', 'zg_load_scripts');
function zg_load_scripts(){
    if( is_admin() ) return;
    wp_deregister_script( 'jquery-ui-core' );
    wp_enqueue_script( 'jquery-ui-core', site_url(  '/wp-includes/js/jquery/ui.core.js' ), array('jquery'), '1.8.12' );
}
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  • Thanks, Christopher. The missing link for me was wp-includes/script-loader.php. That's some good info there. You mention that it's being registered to enqueue in the footer, but where do you see that? I'm looking for wp_register_script() there but only see direct calls on the $scripts object.
    – Tom Auger
    Commented Sep 1, 2011 at 16:45
  • 4
    Interestingly, as soon as I wp_enqueue_script() some other (custom) script and mark jquery-ui-core as a dependency, jquery-ui-core is popped to the header!
    – Tom Auger
    Commented Sep 1, 2011 at 16:46
  • I'm not entirely sure if the script loader thing matters -- it says it's for admin only, but it hooks into wp_default_scripts which isn't an admin-only thing. Awesome that it works if you enqueue another as a dependency. I suppose that's because the other script is in the header and WordPress puts ui-core above it. Less work than my solution.
    – chrisguitarguy
    Commented Sep 1, 2011 at 16:49
  • 1
    You should post what you did as an answer, by the way. And mark this as accepted so other folks who have the same question can figure it out.
    – chrisguitarguy
    Commented Sep 1, 2011 at 17:07

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