View file File name : class-wp-widget-categories.php Content :<?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( 'classname' => 'widget_categories', 'description' => __( 'A list or dropdown of categories.' ), 'customize_selective_refresh' => true, 'show_instance_in_rest' => true, ); parent::__construct( 'categories', __( 'Categories' ), $widget_ops ); } /** * Outputs the content for the current Categories widget instance. * * @since 2.8.0 * @since 4.2.0 Creates a unique HTML ID for the `<select>` element * if more than one instance is displayed on the page. * * @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; $default_title = __( 'Categories' ); $title = ! empty( $instance['title'] ) ? $instance['title'] : $default_title; /** This filter is documented in wp-includes/widgets/class-wp-widget-pages.php */ $title = apply_filters( 'widget_title', $title, $instance, $this->id_base ); $count = ! empty( $instance['count'] ) ? '1' : '0'; $hierarchical = ! empty( $instance['hierarchical'] ) ? '1' : '0'; $dropdown = ! 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' => $count, 'hierarchical' => $hierarchical, ); if ( $dropdown ) { printf( '<form action="%s" method="get">', esc_url( home_url() ) ); $dropdown_id = ( $first_dropdown ) ? 'cat' : "{$this->id_base}-dropdown-{$this->number}"; $first_dropdown = false; echo '<label class="screen-reader-text" for="' . esc_attr( $dropdown_id ) . '">' . $title . '</label>'; $cat_args['show_option_none'] = __( 'Select Category' ); $cat_args['id'] = $dropdown_id; /** * Filters the arguments for the Categories widget drop-down. * * @since 2.8.0 * @since 4.9.0 Added the `$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>'; ob_start(); ?> <script> (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 wp_print_inline_script_tag( wp_remove_surrounding_empty_script_tags( ob_get_clean() ) ); } else { $format = current_theme_supports( 'html5', 'navigation-widgets' ) ? 'html5' : 'xhtml'; /** This filter is documented in wp-includes/widgets/class-wp-nav-menu-widget.php */ $format = apply_filters( 'navigation_widgets_format', $format ); if ( 'html5' === $format ) { // The title may be filtered: Strip out HTML and make sure the aria-label is never empty. $title = trim( strip_tags( $title ) ); $aria_label = $title ? $title : $default_title; echo '<nav aria-label="' . esc_attr( $aria_label ) . '">'; } ?> <ul> <?php $cat_args['title_li'] = ''; /** * Filters the arguments for the Categories widget. * * @since 2.8.0 * @since 4.9.0 Added the `$instance` parameter. * * @param array $cat_args An array of Categories widget options. * @param array $instance Array of settings for the current widget. */ wp_list_categories( apply_filters( 'widget_categories_args', $cat_args, $instance ) ); ?> </ul> <?php if ( 'html5' === $format ) { echo '</nav>'; } } 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 ) { $instance = $old_instance; $instance['title'] = sanitize_text_field( $new_instance['title'] ); $instance['count'] = ! empty( $new_instance['count'] ) ? 1 : 0; $instance['hierarchical'] = ! empty( $new_instance['hierarchical'] ) ? 1 : 0; $instance['dropdown'] = ! empty( $new_instance['dropdown'] ) ? 1 : 0; return $instance; } /** * Outputs the settings form for the Categories widget. * * @since 2.8.0 * * @param array $instance Current settings. */ public function form( $instance ) { // Defaults. $instance = wp_parse_args( (array) $instance, array( 'title' => '' ) ); $count = isset( $instance['count'] ) ? (bool) $instance['count'] : false; $hierarchical = isset( $instance['hierarchical'] ) ? (bool) $instance['hierarchical'] : false; $dropdown = isset( $instance['dropdown'] ) ? (bool) $instance['dropdown'] : false; ?> <p> <label for="<?php echo $this->get_field_id( 'title' ); ?>"><?php _e( 'Title:' ); ?></label> <input class="widefat" id="<?php echo $this->get_field_id( 'title' ); ?>" name="<?php echo $this->get_field_name( 'title' ); ?>" type="text" value="<?php echo esc_attr( $instance['title'] ); ?>" /> </p> <p> <input type="checkbox" class="checkbox" id="<?php echo $this->get_field_id( 'dropdown' ); ?>" name="<?php echo $this->get_field_name( 'dropdown' ); ?>"<?php checked( $dropdown ); ?> /> <label for="<?php echo $this->get_field_id( 'dropdown' ); ?>"><?php _e( 'Display as dropdown' ); ?></label> <br /> <input type="checkbox" class="checkbox" id="<?php echo $this->get_field_id( 'count' ); ?>" name="<?php echo $this->get_field_name( 'count' ); ?>"<?php checked( $count ); ?> /> <label for="<?php echo $this->get_field_id( 'count' ); ?>"><?php _e( 'Show post counts' ); ?></label> <br /> <input type="checkbox" class="checkbox" id="<?php echo $this->get_field_id( 'hierarchical' ); ?>" name="<?php echo $this->get_field_name( 'hierarchical' ); ?>"<?php checked( $hierarchical ); ?> /> <label for="<?php echo $this->get_field_id( 'hierarchical' ); ?>"><?php _e( 'Show hierarchy' ); ?></label> </p> <?php } }