Hi @Gianluca Giurlando and welcome to the GreeenSock Forum!
Yes that is still valid.
On the frontend of your website, check the browser dev tools Network panel and make sure your GSAP CDN script is being run/loaded before your custom GSAP script JS file. This way your custom code runs after GSAP is already loaded
Also you might have to add a DOM ready event and window load event to make sure your code is running when the HTML markup (DOM) and window is fully loaded.
// wait until DOM is ready
document.addEventListener("DOMContentLoaded", function(event) {
console.log("DOM loaded");
// wait until images, links, fonts, stylesheets, and js is loaded
window.addEventListener("load", function(e) {
// custom GSAP code goes here
console.log("window loaded");
}, false);
});
Check your dev tools console to make sure you see those output console logs.
<?php
// The proper way to enqueue GSAP script
// wp_enqueue_script( $handle, $src, $deps, $ver, $in_footer );
function theme_gsap_script() {
wp_enqueue_script( 'gsap-js', 'http://cdnjs.cloudflare.com/ajax/libs/gsap/2.1.1/TweenMax.min.js', array(), false, true );
wp_enqueue_script( 'gsap-js', get_template_directory_uri() . '/wp-content/js/custom-gsap-scripts.js', array(), false, true );
}
add_action( 'wp_enqueue_scripts', 'theme_gsap_script' );
?>
The link to the WordPress Codex for enqueuing JS files:
http://codex.wordpress.org/Function_Reference/wp_enqueue_script
For easy reference:
Happy Tweening!
