WP_Widget_Categories::widget( array $args, array $instance )

45	public function widget( $args, $instance ) {46		static $first_dropdown = true;47 48		$default_title = __( 'Categories' );49		$title         = ! empty( $instance['title'] ) ? $instance['title'] : $default_title;50 51		/** This filter is documented in wp-includes/widgets/class-wp-widget-pages.php */52		$title = apply_filters( 'widget_title', $title, $instance, $this->id_base );53 54		$count        = ! empty( $instance['count'] ) ? '1' : '0';55		$hierarchical = ! empty( $instance['hierarchical'] ) ? '1' : '0';56		$dropdown     = ! empty( $instance['dropdown'] ) ? '1' : '0';57 58		echo $args['before_widget'];59 60		if ( $title ) {61			echo $args['before_title'] . $title . $args['after_title'];62		}63 64		$cat_args = array(65			'orderby'      => 'name',66			'show_count'   => $count,67			'hierarchical' => $hierarchical,68		);69 70		if ( $dropdown ) {71			printf( '<form action="%s" method="get">', esc_url( home_url() ) );72			$dropdown_id    = ( $first_dropdown ) ? 'cat' : "{$this->id_base}-dropdown-{$this->number}";73			$first_dropdown = false;74 75			echo '<label class="screen-reader-text" for="' . esc_attr( $dropdown_id ) . '">' . $title . '</label>';76 77			$cat_args['show_option_none'] = __( 'Select Category' );78			$cat_args['id']               = $dropdown_id;79 80			/**81			 * Filters the arguments for the Categories widget drop-down.82			 *83			 * @since 2.8.084			 * @since 4.9.0 Added the `$instance` parameter.85			 *86			 * @see wp_dropdown_categories()87			 *88			 * @param array $cat_args An array of Categories widget drop-down arguments.89			 * @param array $instance Array of settings for the current widget.90			 */91			wp_dropdown_categories( apply_filters( 'widget_categories_dropdown_args', $cat_args, $instance ) );92 93			echo '</form>';94 95			ob_start();96			?>97 98<script>99( ( dropdownId ) => {100	const dropdown = document.getElementById( dropdownId );101	function onSelectChange() {102		setTimeout( () => {103			if ( 'escape' === dropdown.dataset.lastkey ) {104				return;105			}106			if ( dropdown.value && parseInt( dropdown.value ) > 0 && dropdown instanceof HTMLSelectElement ) {107				dropdown.parentElement.submit();108			}109		}, 250 );110	}111	function onKeyUp( event ) {112		if ( 'Escape' === event.key ) {113			dropdown.dataset.lastkey = 'escape';114		} else {115			delete dropdown.dataset.lastkey;116		}117	}118	function onClick() {119		delete dropdown.dataset.lastkey;120	}121	dropdown.addEventListener( 'keyup', onKeyUp );122	dropdown.addEventListener( 'click', onClick );123	dropdown.addEventListener( 'change', onSelectChange );124})( <?php echo wp_json_encode( $dropdown_id, JSON_HEX_TAG | JSON_UNESCAPED_SLASHES ); ?> );