Documentation JavaScript


Tips and best practices for JavaScript files:

  • Use wp_register_script() and wp_enqueue_script() to initialize your Javascript files. This ensures compatibility with other plugins and avoids conflicts.
  • As with everything, prefix your script slugs when registering or enqueuing them.
  • The jQuery version that is packaged with WordPress is in compatibility mode. This means that jQuery() needs to be explicitly used, not the $() short form.
  • Avoid usage of scripts not hosted on There is a comprehensive list of scripts included. All scripts are served by a CDN.
  • If you need to register a script that is not part of WordPress, or your your theme, make sure to use a packed version if available and make sure that their servers are up for the traffic you will request from them. Fail gracefully.
  • Adding a version to the script when enqueueing isn’t necessary. When we concatenate files, we append the filemtime of the last updated file as a cache buster. If the file isn’t concatenated for some reason, we just use the file’s mtime.