Ticket #44019: 44019.1.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 );
+                        $onchange = 'if ( this.value > 0 ) { var form = this.form; if ( ! form ) { form = this.parentNode; while ( form && form.nodeName !== \'form\'  ) { form = form.parentNode; } } if ( form ) { form.submit(); } }';
+                        $dropdown = preg_replace(
+                                '/(?<=<select\b)/',
+                                sprintf( ' onchange="%s" ', esc_attr( $onchange ) ),
+                                $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>