Source
File: wp-includes/widgets/class-wp-widget-categories.php
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>';
$type_attr = current_theme_supports( 'html5', 'script' ) ? '' : ' type="text/javascript"';
?>
<script<?php echo $type_attr; ?>>
/* <![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 {
$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 role="navigation" 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'];
}