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Simple class to add custom taxonomy dropdown to a custom post type admin edit list
<?php
if (!class_exists('Tax_CTP_Filter')){
/**
* Tax CTP Filter Class
* Simple class to add custom taxonomy dropdown to a custom post type admin edit list
* @author Ohad Raz <admin@bainternet.info>
* @version 0.1
*/
class Tax_CTP_Filter
{
/**
* __construct
* @author Ohad Raz <admin@bainternet.info>
* @since 0.1
* @param array $cpt [description]
*/
function __construct($cpt = array()){
$this->cpt = $cpt;
// Adding a Taxonomy Filter to Admin List for a Custom Post Type
add_action( 'restrict_manage_posts', array($this,'my_restrict_manage_posts' ));
}
/**
* my_restrict_manage_posts add the slelect dropdown per taxonomy
* @author Ohad Raz <admin@bainternet.info>
* @since 0.1
* @return void
*/
public function my_restrict_manage_posts() {
// only display these taxonomy filters on desired custom post_type listings
global $typenow;
$types = array_keys($this->cpt);
if (in_array($typenow, $types)) {
// create an array of taxonomy slugs you want to filter by - if you want to retrieve all taxonomies, could use get_taxonomies() to build the list
$filters = $this->cpt[$typenow];
foreach ($filters as $tax_slug) {
// retrieve the taxonomy object
$tax_obj = get_taxonomy($tax_slug);
$tax_name = $tax_obj->labels->name;
// output html for taxonomy dropdown filter
echo "<select name='".strtolower($tax_slug)."' id='".strtolower($tax_slug)."' class='postform'>";
echo "<option value=''>Show All $tax_name</option>";
$this->generate_taxonomy_options($tax_slug,0,0,(isset($_GET[strtolower($tax_slug)])? $_GET[strtolower($tax_slug)] : null));
echo "</select>";
}
}
}
/**
* generate_taxonomy_options generate dropdown
* @author Ohad Raz <admin@bainternet.info>
* @since 0.1
* @param string $tax_slug
* @param string $parent
* @param integer $level
* @param string $selected
* @return void
*/
public function generate_taxonomy_options($tax_slug, $parent = '', $level = 0,$selected = null) {
$args = array('show_empty' => 1);
if(!is_null($parent)) {
$args = array('parent' => $parent);
}
$terms = get_terms($tax_slug,$args);
$tab='';
for($i=0;$i<$level;$i++){
$tab.='--';
}
foreach ($terms as $term) {
// output each select option line, check against the last $_GET to show the current option selected
echo '<option value='. $term->slug, $selected == $term->slug ? ' selected="selected"' : '','>' .$tab. $term->name .' (' . $term->count .')</option>';
$this->generate_taxonomy_options($tax_slug, $term->term_id, $level+1,$selected);
}
}
}//end class
}//end if
/*
//usage:
new Tax_CTP_Filter(array(
'CUSTOM_POST_TYPE_NAME' => array('CUSTOM_TAXONOMY_NAME2','CUSTOM_TAXONOMY_NAME2')
)
);
*/
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