I want to put JavaScript code on certain pages in frontend, But the output returns null.

add_action( 'wp_footer', function () {

    $screen = get_current_screen();
    var_dump( $screen );

}, 999 );

CodePudding user response：

According to get_current_screen^Docs:

it'll "return current screen object or null when screen not defined".

If you want to use it to detect admin pages, then use a different hook, for example you could use current_screen hook:

add_action('current_screen', 'detecting_current_screen');

function detecting_current_screen()
{
  $current_screen = get_current_screen();

  print_r($current_screen);
}

Or

add_action('current_screen', 'detecting_current_screen');

function detecting_current_screen()
{
  global $current_screen;

  print_r($current_screen);
}

If you want to use it on the client-side and that returns null, then you could use a global variable called $pagenow.

Note: $pagenow will give you the template name.

global $pagenow;

echo $pagenow;

Or

echo $GLOBALS["pagenow"];

This should give you the name of the template you're on:

add_action( 'wp_footer', function () {

    global $pagenow;

    echo $pagenow;

}, 999 );

If none of the methods, mentioned above, work for you, then you could use another global variable called $post.

Or

You could check your page by using:

get_page_by_title^Docs
or
get_page_by_path^Docs