Enque script based on url paramater

Question

I'm using the following to enqueue a script in admin.

function add_admin_scripts( $hook ) {

    global $post;

    if ( $hook == 'post-new.php' || $hook == 'post.php' ) {
        if ( 'custom' === $post->post_type ) {     
            wp_enqueue_script(  'myscript', get_stylesheet_directory_uri().'/js/custom.js' );
        }
    }
}
add_action( 'admin_enqueue_scripts', 'add_admin_scripts', 10, 1 );

But I want to enqueue when action=edit is in the URL parameter.

http://mysite/wp-themes/my-theme/wp-admin/post.php?post=185&action=edit

Is this possible?

Answer 1

There are a couple of ways to do this. The easiest way is to use $_GET:

if ( ( $hook == 'post-new.php' || $hook == 'post.php' ) && $_GET['action'] == 'edit' ) {
    // Enqueue your scripts here
}

You can also use the get_current_screen(); function instead of using a global variable.