Added the choosen page lenght as an option to the dropdown if it's not one of the default options

wp-jquery-datatable.php

@@ -230,6 +230,25 @@ function wp_jdt_shortcode($atts)
     $table_searching = ($atts['searching'] === 'true') ? 'true' : 'false';
 
     $table_length_menu = array(10, 25, 50, 100, -1);
+    if (!in_array($table_page_length, $table_length_menu)) {
+        // Add the missing page length option to the array
+        $table_length_menu[] = (int)$table_page_length;
+
+        // Temporarily remove -1 ("All") if present to preserve its position at the end
+        $has_all = false;
+        if (($key = array_search(-1, $table_length_menu)) !== false) {
+            unset($table_length_menu[$key]);
+            $has_all = true;
+        }
+
+        // Sort the remaining numeric options in ascending order
+        sort($table_length_menu);
+
+        // Append -1 back to the end of the array
+        if ($has_all) {
+            $table_length_menu[] = -1;
+        }
+    }
 
     // css and js
     wp_enqueue_style('jdt-style-data-tables');