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

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<?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
* @since 4.4.0 Added support for other taxonomies.
*
* @see WP_Widget
*/
class WP_Widget_Categories extends WP_Widget {
public function __construct() {
$widget_ops = array( 'classname' => 'widget_categories', 'description' => __( "A list or dropdown of categories." ) );
parent::__construct('categories', __('Categories'), $widget_ops);
}
/**
* @staticvar bool $first_dropdown
*
* @param array $args
* @param array $instance
*/
public function widget( $args, $instance ) {
static $first_dropdown = true;
$current_taxonomy = $this->_get_current_taxonomy( $instance );
/** This filter is documented in wp-includes/widgets/class-wp-widget-pages.php */
$title = apply_filters( 'widget_title', empty( $instance['title'] ) ? __( 'Categories' ) : $instance['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'];
}
$tax = get_taxonomy( $current_taxonomy );
$cat_args = array(
'orderby' => 'name',
'show_count' => $c,
'hierarchical' => $h,
'taxonomy' => $current_taxonomy,
);
if ( $d ) {
$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'] = $tax->labels->select_name;
$cat_args['id'] = $dropdown_id;
/**
* Filter the arguments for the Categories widget drop-down.
*
* @since 2.8.0
*
* @see wp_dropdown_categories()
*
* @param array $cat_args An array of Categories widget drop-down arguments.
*/
wp_dropdown_categories( apply_filters( 'widget_categories_dropdown_args', $cat_args ) );
?>
<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 ) {
location.href = "<?php echo home_url(); ?>/?cat=" + dropdown.options[ dropdown.selectedIndex ].value;
}
}
dropdown.onchange = onCatChange;
})();
/* ]]> */
</script>
<?php
} else {
?>
<ul>
<?php
$cat_args['title_li'] = '';
/**
* Filter the arguments for the Categories widget.
*
* @since 2.8.0
*
* @param array $cat_args An array of Categories widget options.
*/
wp_list_categories( apply_filters( 'widget_categories_args', $cat_args ) );
?>
</ul>
<?php
}
echo $args['after_widget'];
}
/**
* @param array $new_instance
* @param array $old_instance
* @return array
*/
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;
$instance['taxonomy'] = stripslashes( $new_instance['taxonomy'] );
return $instance;
}
/**
* @param array $instance
*/
public function form( $instance ) {
//Defaults
$instance = wp_parse_args( (array) $instance, array( 'title' => '') );
$title = sanitize_text_field( $instance['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;
$current_taxonomy = $this->_get_current_taxonomy( $instance );
?>
<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( $title ); ?>" /></p>
<p>
<label for="<?php echo esc_attr( $this->get_field_id( 'taxonomy' ) ); ?>"><?php _e( 'Taxonomy:' ) ?></label>
<select class="widefat" id="<?php echo esc_attr( $this->get_field_id( 'taxonomy' ) ); ?>" name="<?php echo esc_attr( $this->get_field_name( 'taxonomy' ) ); ?>">
<?php foreach ( get_taxonomies( array(), 'objects' ) as $taxonomy ) : ?>
<?php
if ( ! $taxonomy->hierarchical || empty( $taxonomy->labels->name ) ) :
continue;
endif;
?>
<option value="<?php echo esc_attr( $taxonomy->name ); ?>" <?php selected( $taxonomy->name, $current_taxonomy ) ?>><?php echo esc_html( $taxonomy->labels->name ); ?></option>
<?php endforeach; ?>
</select>
</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
}
/**
* Retrieves the taxonomy for the current widget instance.
*
* @since 4.4.0
* @access public
*
* @param array $instance Current settings.
* @return string Name of the current taxonomy if set, otherwise 'category'.
*/
public function _get_current_taxonomy( $instance ) {
if ( ! empty( $instance['taxonomy'] ) && taxonomy_exists( $instance['taxonomy'] ) ) {
return $instance['taxonomy'];
}
return 'category';
}
}