Do not output JS/CSS when not eligible

re #161

README.md

@@ -17,3 +17,4 @@ Collaborate, participate, fork this plugin on [Github](https://github.com/zedzed
 ## Links
 
 * [WordPress plugin page](https://wordpress.org/plugins/table-of-contents-plus/)
+* [Plugin homepage](http://dublue.com/plugins/toc/)

includes/class-toc-plus.php

@@ -220,6 +220,8 @@ public function shortcode_toc( $attributes ) {
 			}
 
 			if ( $re_enqueue_scripts ) {
+				// the shortcode has provided potentially new labels and we need to
+				// supply these new values to js_vars by enqueing scripts again
 				do_action( 'wp_enqueue_scripts' );
 			}
 
@@ -450,6 +452,11 @@ public function shortcode_sitemap_posts( $attributes ) {
 		 * Register and load CSS and javascript files for frontend.
 		 */
 		public function wp_enqueue_scripts() {
+			// Do not output CSS / JS if the TOC is not going to be displayed on the current page
+			if ( ! $this->is_eligible() ) {
+				return;
+			}
+
 			$js_vars = [];
 
 			// register our CSS and scripts
@@ -1531,9 +1538,11 @@ public function extract_headings( &$find, &$replace, $content = '' ) {
 		/**
 		 * Returns true if the table of contents is eligible to be printed, false otherwise.
 		 */
-		public function is_eligible( $shortcode_used = false ) {
+		public function is_eligible() {
 			global $post;
 
+			$custom_toc_position = strpos( $post->content, '[TOC]' );
+
 			// Do not trigger the TOC on REST Requests unless explicitly enabled.
 			// This ensures that the TOC is not included in REST API responses by default.
 			// If the TOC inclusion in REST API responses is desired, 
@@ -1550,7 +1559,7 @@ public function is_eligible( $shortcode_used = false ) {
 			}
 
 			// if the shortcode was used, this bypasses many of the global options
-			if ( false !== $shortcode_used ) {
+			if ( false !== $custom_toc_position ) {
 				// shortcode is used, make sure it adheres to the exclude from
 				// homepage option if we're on the homepage
 				if ( ! $this->options['include_homepage'] && is_front_page() ) {
@@ -1588,7 +1597,7 @@ public function the_content( $content ) {
 			$replace             = [];
 			$custom_toc_position = strpos( $content, '<!--TOC-->' );
 
-			if ( $this->is_eligible( $custom_toc_position ) ) {
+			if ( $this->is_eligible() ) {
 
 				$items = $this->extract_headings( $find, $replace, $content );
 

readme.txt

@@ -108,6 +108,7 @@ I will never ask for any form of reward or compensation.  Helping others achieve
 * Released: February 2024
 * Added option to generate TOC in REST requests, disabled by default (props ballpumpe)
 * Composer improvements (props mohjak)
+* Do not output CSS/JS on pages not eligible
 * Update POT translation file
 * Update links to help