Showing custom taxonomy filter in custom post types in wordpress admin post listing

Please note that “this post is for them who knows custom post types and custom taxonomy in wordpress”

Isn’t the title enough to get what my article about ?

Let me paste the code what I did: I think I collected the basic code from somewhere and then edited as I need.

[code language=”php”]
add_action( ‘restrict_manage_posts’, ‘todo_restrict_manage_posts’ );
add_filter(‘parse_query’,’todo_convert_restrict’);
function todo_restrict_manage_posts() {
global $typenow;
//var_dump($typenow);
$args = array( ‘public’ => true, ‘_builtin’ => false );
$post_types = get_post_types($args);
//var_dump($post_types);
//$post_types = array(‘blogs’, ‘product’, ‘portfolios’);
//var_dump($post_types);
if ( in_array($typenow, $post_types) ) {
$filter = get_object_taxonomies($typenow);
/*
$filters = array(
‘blogs’ => array(‘blog_cat’,’blog_tag’),
‘product’ => array(‘product_tag’,’product_cat’),
‘portfolios’ => array(‘technology’)
);
$filter = $filters[$typenow];
*/

//var_dump($filters);
foreach ($filter as $tax_slug) {
//foreach($tax_slug 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’ => ‘name’,
‘selected’ => $_GET[$tax_obj->query_var],
‘hierarchical’ => $tax_obj->hierarchical,
‘show_count’ => true,
‘hide_empty’ => false
));
//}
}
}
}
function todo_convert_restrict($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 = $term->slug;
}
}
}
}
function override_is_tax_on_post_search($query) {
global $pagenow;
$qv = &$query->query_vars;
if ($pagenow == ‘edit.php’ && isset($qv[‘taxonomy’]) && isset($qv[‘s’])) {
$query->is_tax = true;
}
}
add_filter(‘parse_query’,’override_is_tax_on_post_search’);
[/code]

What the code does:

1. The hook/action is executed when admin post listing is done
2. It’s finds all the custom post types and if post type and post listing type match it finds the custom taxonomy types for that post type.
3. Shows the Custom taxonomy types for custom post type as filter or drop down list
4. Here we did a check if the search query is same the taxonomy!
5. That’s it.

Let me show a screenshot how it looks for my custom post type named ‘product’ and it’s custom taxonomy as category and tags.

Update: I have a pro plugin to do this. Any one interested can buy  from my company sites from here .