<?php

/**

 * Widget API: WP_Widget_Categories class

 *

 * @package WordPress

 * @subpackage Widgets

 * @since 4.4.0

 */

/**

 * Core class used to implement a Categories widget.

 *

 * @since 2.8.0

 *

 * @see WP_Widget

 */

class WP_Widget_Categories extends WP_Widget {

	/**

	 * Sets up a new Categories widget instance.

	 *

	 * @since 2.8.0

	 */

	public function __construct() {

		$widget_ops = array(

			'customize_selective_refresh' => true,

		);

		parent::__construct( 'categories', __( 'Categories' ), $widget_ops );

	}

	/**

	 * Outputs the content for the current Categories widget instance.

	 *

	 * @since 2.8.0

	 *

	 * @staticvar bool $first_dropdown

	 *

	 * @param array $args     Display arguments including 'before_title', 'after_title',

	 *                        'before_widget', and 'after_widget'.

	 * @param array $instance Settings for the current Categories widget instance.

	 */

	public function widget( $args, $instance ) {

		static $first_dropdown = true;

		$title = ! empty( $instance['title'] ) ? $instance['title'] : __( 'Categories' );

		/** This filter is documented in wp-includes/widgets/class-wp-widget-pages.php */

		$title = apply_filters( 'widget_title', $title, $instance, $this->id_base );

		$c = ! empty( $instance['count'] ) ? '1' : '0';

		$h = ! empty( $instance['hierarchical'] ) ? '1' : '0';

		$d = ! empty( $instance['dropdown'] ) ? '1' : '0';

		echo $args['before_widget'];

		if ( $title ) {

			echo $args['before_title'] . $title . $args['after_title'];

		}

		$cat_args = array(

			'orderby'      => 'name',

			'show_count'   => $c,

			'hierarchical' => $h,

		);

		if ( $d ) {

			echo sprintf( '<form action="%s" method="get">', esc_url( home_url() ) );

			$first_dropdown = false;

			echo '<label class="screen-reader-text" for="' . esc_attr( $dropdown_id ) . '">' . $title . '</label>';

			$cat_args['show_option_none'] = __( 'Select Category' );

			/**

			 * Filters the arguments for the Categories widget drop-down.

			 *

			 * @since 2.8.0

			 * @since 4.9.0 Added the `$instance` parameter.

			 *

			 * @see wp_dropdown_categories()

			 *

			 * @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 ) );

			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>

		} else {

		<ul>

		</ul>

		}

		echo $args['after_widget'];

	}

	/**

	 * Handles updating settings for the current Categories widget instance.

	 *

	 * @since 2.8.0

	 *

	 * @param array $new_instance New settings for this instance as input by the user via

	 *                            WP_Widget::form().

	 * @param array $old_instance Old settings for this instance.

	 * @return array Updated settings to save.

	 */

	public function update( $new_instance, $old_instance ) {

		return $instance;

	}

	/**

	 * Outputs the settings form for the Categories widget.

	 *

	 * @since 2.8.0

	 *

	 * @param array $instance Current settings.

	 */

	public function form( $instance ) {

		//Defaults

		$hierarchical = isset( $instance['hierarchical'] ) ? (bool) $instance['hierarchical'] : false;

		?>

		<?php

	}

}