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I'm building a plugin and I want to add bits of javascript in the admin head but only for certain admin pages. I don't mean pages as in a WordPress page that you create yourself but rather existing admin section pages like 'Your Profile', 'Users', etc. Is there a wp function specifically for this task? I've been looking and I can only find the boolean function is_admin and action hooks but not a boolean function that just checks.

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Gentle nudge to remind you an answer has not been accepted. If none the answers provided answer your question sufficiently or you're struggling to understand the information provided please comment to let us know. –  t31os Feb 24 '11 at 17:21
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4 Answers

up vote 8 down vote accepted

The way to do this is to use the 'admin_enqueue_scripts' hook to en-queue the files you need. This hook will get passed a $hook_suffix that relates to the current page that is loaded:

function my_admin_enqueue($hook_suffix) {
    if($hook_suffix == 'appearance_page_theme-options') {
        wp_enqueue_script('my-theme-settings', get_template_directory_uri() . '/js/theme-settings.js', array('jquery'));
        wp_enqueue_style('my-theme-settings', get_template_directory_uri() . '/styles/theme-settings.css');
        ?>
        <script type="text/javascript">
        //<![CDATA[
        var template_directory = '<?php echo get_template_directory_uri() ?>';
        //]]>
        </script>
        <?php
    }
}
add_action('admin_enqueue_scripts', 'my_admin_enqueue');
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Thanks for sharing your info. –  racl101 Apr 20 '11 at 17:26
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There is a global variable in wp-admin called $pagenow which holds name of the current page, ie edit.php, post.php, etc.

You can also check the $_GET request to narrow your location down further, for example:

global $pagenow;
if (( $pagenow == 'post.php' ) && ($_GET['post_type'] == 'page')) {

    // editing a page

    }

if ($pagenow == 'users.php') {

    // user listing page

    }

if ($pagenow == 'profile.php') {

    // editing user profile page

    }
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To offer an alternative method/approach to the above question.

// When you are viewing the users list or your editing another user's profile
add_action( 'admin_print_scripts-users.php', 'your_enqueue_callback' );

// When you are editing your own profile
add_action( 'admin_print_scripts-profile.php', 'your_enqueue_callback' );

function your_enqueue_callback() {
    wp_enqueue_script( .. YOUR ENQUEUE ARGS .. );
}

This method targets the specific pages more directly and avoids needing conditional logic inside your callback(because you've already made that distinction in the selected hook).

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Wish i knew why this answer didn't get more votes, covers the exact use case in the question, and provides the solution in a minimal amount of code. Feedback would be nice.. –  t31os Jan 28 at 14:56
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The most comprehensive method is get_current_screen added in WordPress 3.1

$screen = get_current_screen();

returns

WP_Screen Object (
    [action] => 
    [base] => post
    [id] => post
    [is_network] => 
    [is_user] => 
    [parent_base] => edit
    [parent_file] => edit.php
    [post_type] => post
    [taxonomy] => 
)
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