WordPress JavaScript & AJAX

Reference for JavaScript integration in WordPress: script registration and enqueuing, passing data from PHP to JS, AJAX request/response patterns, the Heartbeat API, jQuery usage, and loading strategies.

1. Enqueuing Scripts

WordPress manages JavaScript dependencies through a registration and enqueuing system. Never output <script> tags directly — always use the enqueue API.

Basic Pattern

add_action( 'wp_enqueue_scripts', 'map_enqueue_frontend_scripts' );