There is a function called wp_script_is( $handle, $list ). $list can be one of: ‘registered’ — was registered through wp_register_script() ‘queue’ — was enqueued through wp_enqueue_script() ‘done’ — has been printed ‘to_do’ — will be printed Ditto all that for wp_style_is().
Why registering and queuing properly matters it should be in time – earlier than script/style is up for being output to page, otherwise it is too late; it should be conditional – otherwise you are loading stuff where you don’t need it and cause performance and functionality issues, for this you need WP environment loaded … Read more
I found an other way that works well for me: When initializing the plugin, do not enqueue your scripts and styles, but register them with wp_register_style and wp_register_script. Next you can load the script/style on demand. For example when you render a shortcode with wp_enqueue_style(“your_style”) and wp_enqueue_script(“your_script”). Here is an example plugin using this method … Read more