Collapse course navigation widget list items

add_action( 'wp_footer', function () {
	?>
	<script>
	jQuery( document ).ready(function() {
		if ( jQuery('#course_navigation').length ) {

			// Get any exanded list items. 
			jQuery('#course_navigation div.learndash_navigation_lesson_topics_list div.list_arrow.expand').each( function(){
				var list_id = jQuery(this).parent().attr('id');

				// list_id will look something like 'lesson_list-xxx'
				// We need to split off the xxx lesson ID on the end. 
				if ( typeof list_id !== 'undefined' ) {
					var list_item_sub = list_id.substr(0, 12);
					if ( list_item_sub == 'lesson_list-' ) {
						var list_item_id = list_id.replace( 'lesson_list-', '' );
						
						// finally call the flip_expand_collapse() function to collapse the list
						flip_expand_collapse("#lesson_list", list_item_id);
					}
				}
			})
		}
	});
	</script>
	<?php
});

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