Ticket #44019: 44019.0.diff

src/wp-includes/widgets/class-wp-widget-categories.php

@@ -86 +86 @@
                          * @param array $cat_args An array of Categories widget drop-down arguments.
                          * @param array $instance Array of settings for the current widget.
                          */
-                        wp_dropdown_categories( apply_filters( 'widget_categories_dropdown_args', $cat_args, $instance ) );
-
+                        $cat_args         = apply_filters( 'widget_categories_dropdown_args', $cat_args, $instance );
+                        $cat_args['echo'] = false;
+
+                        $dropdown = wp_dropdown_categories( $cat_args );
+                        $dropdown = preg_replace(
+                                '/(?<=<select\b)/',
+                                ' onchange="if ( this.value > 0 ) { this.form.submit(); }" ',
+                                $dropdown,
+                                1
+                        );
+                        echo $dropdown;
                         echo '</form>';
-                        ?>
-
-<script type='text/javascript'>
-/* <![CDATA[ */
-(function() {
-        var dropdown = document.getElementById( "<?php echo esc_js( $dropdown_id ); ?>" );
-        function onCatChange() {
-                if ( dropdown.options[ dropdown.selectedIndex ].value > 0 ) {
-                        dropdown.parentNode.submit();
-                }
-        }
-        dropdown.onchange = onCatChange;
-})();
-/* ]]> */
-</script>
-
-<?php
                 } else {
 ?>
                 <ul>