php functions and wordpress

Question

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).

======================================================== 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')
;

Under what conditions do you want the script to be included? — arcade Gandalf
– arcade Gandalf, Commented Feb 17, 2015 at 12:17

JBA · Accepted Answer · 2015-02-17 12:21:14Z

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...

answered Feb 17, 2015 at 12:21

JBA

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4 Comments

petr jian Over a year ago

thanks poozolax, I guess I can just define a global variable and fire the function based on the condition.

JBA Over a year ago

just in case you don't already know it (?) the $post variable is a default, already given to you by wordpress each time you load a new page/post/media... So you just have to grab it into your function with global $post and starting from that you can retrieve everything you need about the loaded page which Wordpress always calls a $post

petr jian Over a year ago

thanks this is a great help. My final question - is it possible to define any global variable. for example global $hompg = true; I assume global would mean the variable can be accessed from other scripts.. Many thanks

JBA Over a year ago

You can declare any variable you need into function.php as this file is always loaded. On another side you have a bunch of global variables that Wordpress handles for you some are listed here … To follow your example, speaking about homepage, it's easier in Wordpress to ask if (is_front_page()) than defining a global variable for yourself: this latest snipped will let you know if you're on the front-page defined in the admin panel settings...

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