php functions and wordpress

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I’m migrating my webpage(s) to wordpress and thus creating a theme. However, the page has a number of scripts (javascript) than need to run. Please may someone clarify my understanding.

To run the scripts I’ve added them to the functions.php file using the format below. I assume add_actions calls / runs the function. However, will this script run on every page? is there a way of being selective (making some scripts run on page X but not on Y).

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Functions.php 

function my_theme_scripts_function() {
    wp_enqueue_script( 'myscript', get_template_directory_uri() .   '/js/myscript.js');
    }

add_action('wp_enqueue_scripts','my_theme_scripts_function')
;
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1 comment

  1. In such functions, you can simply grab the current page, and make a conditional processing depending on the id, or any other characteristic of this page. For example let’s say you want to apply some script on the page ID 4: 

    function my_theme_scripts_function() {
   global $post;
   if ($post->ID == 4) {
      wp_enqueue_script( 'myscript', get_template_directory_uri() . '/js/myscript.js');
   } 
}

add_action('wp_enqueue_scripts','my_theme_scripts_function');

    You could also apply this for a page slug, the presence of a meta-data, or whatever…