zw-1988.com

/*adding-a-taxonomy-filter-to-admin-list-for-a-custom-post-type*/
function todo_restrict_manage_posts()
{
    global $typenow;
    $args = array('public' => true, '_builtin' => false);
    $post_types = get_post_types($args);
    if (in_array($typenow, $post_types)) {
        $filters = get_object_taxonomies($typenow);
        foreach ($filters as $tax_slug) {
            $tax_obj = get_taxonomy($tax_slug);
            wp_dropdown_categories(array(
                'show_option_all' => __('Show All ' . $tax_obj->label),
                'taxonomy' => $tax_slug,
                'name' => $tax_obj->name,
                'orderby' => 'term_order',
                //'selected' => $_GET[$tax_obj->query_var],
                'hierarchical' => $tax_obj->hierarchical,
                'show_count' => false,
                'hide_if_empty' => true
            ));
        }
    }
}


function todo_convert_restrict($query)
{
    global $pagenow;
    global $typenow;
    if ($pagenow == 'edit.php') {
        $filters = get_object_taxonomies($typenow);
        foreach ($filters as $tax_slug) {
            $var = &$query->query_vars[$tax_slug];
            if (isset($var)) {
                $term = get_term_by('id', $var, $tax_slug);
               $var = !empty($term->slug) ? $term->slug : '';
            }
        }
    }
    return $query;
}
add_action('restrict_manage_posts', 'todo_restrict_manage_posts');
add_filter('parse_query', 'todo_convert_restrict');

wordpress创建分类目录下拉表单函数：wp_dropdown_categories

函数

wp_dropdown_categories( $args );

描述

显示一个目录下拉选择表单元素，函数直接返回html内容。

参数 $args

$args = [
'show_option_all' => '',
'show_option_none' => '',
'option_none_value' => '-1',
'orderby' => 'ID',
'order' => 'ASC',
'show_count' => 0,
'hide_empty' => 1,
'child_of' => 0,
'exclude' => '',
'echo' => 1,
'selected' => 0,
'hierarchical' => 0,
'name' => 'cat',
'id' => '',
'class' => 'postform',
'depth' => 0,
'tab_index' => 0,
'taxonomy' => 'category',
'hide_if_empty' => false,
'value_field' => 'term_id',
];

参数详情