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What is the proper way to include a stylesheet with my options panels in wp-admin for a given plugin or theme. In other words -- the stylesheet that styles the panels.

I mean, in my panel template code, I'm doing something like...

<style type="text/css">
@import url("../wp-content/plugins/myplugin/panels/style.css");

...but suspect that this won't work on some installs of WordPress because of paths and so on, and might not work in the future of WP gets a wild hair and wants to rename wp-content with something else.

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@Sisir please post answers as answers, rather than as comments. – Chip Bennett Apr 9 '12 at 18:45
up vote 1 down vote accepted

The best practice method of enqueueing admin stylesheets is to hook into your appearance page's specific hook, using the admin_print_styles-{hook}, where {hook} = {admin_page}-{menu_slug}.

I'll assume:

  1. This is a Theme
  2. You are properly using an appearance page, via add_appearance_page()
  3. Your $menu_slug is wpse48416-settings

The hook, then, is: admin_print_styles-appearance_page_wpse48416-settings:

function wpse48416_admin_style(){
        wp_register_style( 'wpse48416_admin_css', get_template_directory_uri() . '/css/admin.css' );
        wp_enqueue_style( 'wpse48416_admin_css' );
add_action( 'admin_print_styles-appearance_page_wpse48416-settings', 'wpse48416_admin_style' );

For a Plugin, you simply need to use the correct {page} string, depending on which admin menu function you use to register your settings page, e.g. settings_page for add_settings_page().

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What do I do if I'm using add_menu_page() and add_submenu_page() to add my admin panels? – Volomike Apr 13 '12 at 21:39
"What do I do if I'm using add_menu_page() and add_submenu_page() to add my admin panels" - well, the best practice first step would be to switch to add_theme_page() or add_settings_page(). (grin). But, I think, for add_menu_page() or add_submenu_page(), you'd use admin_page instead of appearance_page. – Chip Bennett Apr 13 '12 at 21:56
I found that they have some fantastic examples at the bottom of these pages to solve my problem, and I have it working! Yay! Go to codex.wordpress.org/Function_Reference, then search "wp_enqueue_script" and "wp_enqueue_style". – Volomike Apr 13 '12 at 22:06
BTW, you said this was the best practice, but is it still the best practice? Note I just discovered this: codex.wordpress.org/Plugin_API/Action_Reference/… – Volomike Apr 13 '12 at 22:32
function load_myplugin_wp_admin_style(){
        wp_register_style( 'myplugin_wp_admin_css', plugins_url( '/myplugin/panels/style.css' ), false, '1.0.0' );
        wp_enqueue_style( 'myplugin_wp_admin_css' );
add_action('admin_enqueue_scripts', 'load_myplugin_wp_admin_style');
share|improve this answer
While this method works, it will print your custom stylesheet on every admin page. At best, it represents bloat; at worst, it will cause style breakage for core and/or other Plugins. – Chip Bennett Apr 9 '12 at 18:28

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