1

I'm trying to add these custom CSS and JS (written inside a custom plugin) only add to a specific page.

this is my code

<?php   

function randomAlphaNumeric($length) {
    $pool = array_merge(range(0,9), range('a', 'z'),range('A', 'Z'));
    $key='';
    for($i=0; $i < $length; $i++) {
        $key .= $pool[mt_rand(0, count($pool) - 1)];
    }
    return $key;
}



add_action('init', 'register_script');
function register_script(){
    if(is_page('page_title')) {
        wp_register_script( 'custom_js', plugins_url('/js/custom-js.js', __FILE__).'?random='.randomAlphaNumeric(5), array('jquery'));
        wp_register_style( 'new_style', plugins_url('/css/new-style.css', __FILE__).'?random='.randomAlphaNumeric(5), false, 'all');
    }
}


// use the registered jquery and style above
add_action('wp_enqueue_scripts', 'enqueue_style');
function enqueue_style(){
    if(is_page('page_title')) {
        wp_enqueue_script('custom_js');
        wp_enqueue_style( 'new_style' );
    } 
}

but is_page() doesn't seem to work at all.. I tried to change it with ID and SLUG, but no success

UPDATE replaced condition to check the page title, still doesnt work

add_action('init', 'register_script');
function register_script(){
    global $post;
    if($post->post_title == 'page_title') {
        wp_register_script( 'custom_js', plugins_url('/js/custom-js.js', __FILE__).'?random='.randomAlphaNumeric(5), array('jquery'));
        wp_register_style( 'new_style', plugins_url('/css/new-style.css', __FILE__).'?random='.randomAlphaNumeric(5), false, 'all');
    }
}


// use the registered jquery and style above
add_action('wp_enqueue_scripts', 'enqueue_style');
function enqueue_style(){
    global $post;
    if($post->post_title == 'page_title') {
        wp_enqueue_script('custom_js');
        wp_enqueue_style( 'new_style' );
    } 
}
4

The init hook is too early — WordPress hasn't yet identified the queried object (post, category, etc.); hence the is_page() doesn't work there:

add_action('init', 'register_script');

So for conditional tags/functions like is_page(), is_single(), etc. to work (i.e. return the proper result), you should use wp or a later hook:

add_action('wp', 'whatever_function');

But for registering/enqueueing scripts and styles, you should always use the wp_enqueue_scripts hook; so you would use this (and not the above):

add_action('wp_enqueue_scripts', 'register_script');

PS: Credits to @huraji for his helpful comment.

  • 1
    yes! thank you, would you please upvote my question, that might be someone else's question too – Cameron A May 24 at 12:56
1
  1. Try to change the parameter from page_titleto page-slug or id. https://developer.wordpress.org/reference/functions/is_page/#parameters
  2. Let's try to register scripts in the same enqueue_style() function right before enqueueing them.

Update: My scope here was to encourage doing tries around different parameters for is_page() AND using the same function enqueue_style() hooked in wp_enqueue_scripts which is the ONLY suggested way to register/enqueue scripts.

  • 1
    Unlike a general forum, answers on Stack Exchange should be full and informative. Answers often don't lend themselves to "help along the way" methods of teaching but direct and informational. Comments are also not a place for extended discussion, I've moved these to chat. – Howdy_McGee May 24 at 14:54

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