I wanna display posts of my custom taxonomy in a dropdown list, I mean I create a filter for taxonomies in my custom post type I have 2 different types which contains some sub-category & in that category I added some posts, the first taxonomy is "Types" and the second one is "Categories", so when I click the taxonomy dropdown and select the sub-category for displaying the posts, nothing displays...

function diwp_arts_custom_post_type(){

$labels = array(
                 'name' => 'Arts',
                 'singular_name' => 'Art',
                 'add_new'    => 'Add New Post',
                 'add_new_item' => 'Enter Art Details',
                 'all_items' => 'All Arts',
                 'featured_image' => 'Add Feature Image',
                 'set_featured_image' => 'Set Feature Image',
                 'remove_featured_image' => 'Remove Feature Image'

               );


$args = array(    
                'public'      => true,
                'label'       => 'Arts',
                'labels'      => $labels,
                'description' => 'Arts is a collection of all Art and their info',
                'menu_icon'      => 'dashicons-art',    
                'supports'   => array( 'title', 'editor', 'thumbnail'),
                'capability_type' => 'page',
                 
             );


register_post_type('arts', $args);

}

add_action( 'init', 'diwp_arts_custom_post_type' );

function wpdocs_create_book_tax() { register_taxonomy( 'Types', 'arts', array( 'label' => __( 'Types', 'textdomain' ), 'rewrite' => array( 'slug' => 'arts' ), 'hierarchical' => true, ) );

register_taxonomy( 'Categories', 'arts', array(
    'label'        => __( 'Categories', 'textdomain' ),
    'rewrite'      => array( 'slug' => 'arts' ),
    'hierarchical' => true,
) );

}

add_action( 'init', 'wpdocs_create_book_tax', 0 );

function get_terms_dropdown_grade_level($taxonomies, $args){ $myterms = get_terms($taxonomies, $args); $output =""; //I can change this name (for my remembreance)! $output .="Select Types"; foreach($myterms as $term){ $root_url = get_bloginfo('url'); $term_taxonomy=$term->taxonomy; $term_slug=$term->slug; $term_name =$term->name; $link = $term_slug; $output .="".$term_name.""; } $output .=""; return $output; }

function get_terms_dropdown_type($taxonomies, $args){
        $myterms = get_terms($taxonomies, $args);
        $output ="<select name='Categories'>";
        $output .="<option value=''>Select Categories</option>";              
    foreach($myterms as $term){
                $root_url = get_bloginfo('url');
                $term_taxonomy=$term->taxonomy;
                $term_slug=$term->slug;
                $term_name =$term->name;
                $link = $term_slug;
                $output .="<option value='".$link."'>".$term_name."</option>";
        }
        $output .="</select>";
return $output;
}

I write this code into the sidebar.php file because I wanna show dropdown on all pages:

    $select = preg_replace("#<select([^>]*)>#", "<select$1 onchange='return this.form.submit()'>", $select);
    echo $select;
    ?>
    <input type="submit" name="submit" value="Go" />
</div>

I wanna display posts of my custom taxonomy in a dropdown list, I mean I create a filter for taxonomies in my custom post type I have 2 different types which contains some sub-category & in that category I added some posts, the first taxonomy is "Types" and the second one is "Categories", so when I click the taxonomy dropdown and select the sub-category for displaying the posts, nothing displays...

function diwp_arts_custom_post_type(){

$labels = array(
                 'name' => 'Arts',
                 'singular_name' => 'Art',
                 'add_new'    => 'Add New Post',
                 'add_new_item' => 'Enter Art Details',
                 'all_items' => 'All Arts',
                 'featured_image' => 'Add Feature Image',
                 'set_featured_image' => 'Set Feature Image',
                 'remove_featured_image' => 'Remove Feature Image'

               );


$args = array(    
                'public'      => true,
                'label'       => 'Arts',
                'labels'      => $labels,
                'description' => 'Arts is a collection of all Art and their info',
                'menu_icon'      => 'dashicons-art',    
                'supports'   => array( 'title', 'editor', 'thumbnail'),
                'capability_type' => 'page',
                 
             );


register_post_type('arts', $args);

}

add_action( 'init', 'diwp_arts_custom_post_type' );

function wpdocs_create_book_tax() { register_taxonomy( 'Types', 'arts', array( 'label' => __( 'Types', 'textdomain' ), 'rewrite' => array( 'slug' => 'arts' ), 'hierarchical' => true, ) );

register_taxonomy( 'Categories', 'arts', array(
    'label'        => __( 'Categories', 'textdomain' ),
    'rewrite'      => array( 'slug' => 'arts' ),
    'hierarchical' => true,
) );

}

add_action( 'init', 'wpdocs_create_book_tax', 0 );

function get_terms_dropdown_grade_level($taxonomies, $args){ $myterms = get_terms($taxonomies, $args); $output =""; //I can change this name (for my remembreance)! $output .="Select Types"; foreach($myterms as $term){ $root_url = get_bloginfo('url'); $term_taxonomy=$term->taxonomy; $term_slug=$term->slug; $term_name =$term->name; $link = $term_slug; $output .="".$term_name.""; } $output .=""; return $output; }

function get_terms_dropdown_type($taxonomies, $args){
        $myterms = get_terms($taxonomies, $args);
        $output ="<select name='Categories'>";
        $output .="<option value=''>Select Categories</option>";              
    foreach($myterms as $term){
                $root_url = get_bloginfo('url');
                $term_taxonomy=$term->taxonomy;
                $term_slug=$term->slug;
                $term_name =$term->name;
                $link = $term_slug;
                $output .="<option value='".$link."'>".$term_name."</option>";
        }
        $output .="</select>";
return $output;
}

I write this code into the sidebar.php file because I wanna show dropdown on all pages:

    $select = preg_replace("#<select([^>]*)>#", "<select$1 onchange='return this.form.submit()'>", $select);
    echo $select;
    ?>
    <input type="submit" name="submit" value="Go" />
</div>

• debug

1 Answer 1

I cant see where in the code you want to have a taxonomy drop-down, and also what you want to do with this drop down. That also depends what values you want to use as option values.

But generally you can use wp_dropdown_categories to create a custom taxonomy drop-down.

wp_dropdown_categories( array(
    'show_option_all' =>  'Show all arts',
    'taxonomy'        =>  'arts', // Name of the taxonomy or taxonomies to retrieve
    'name'            =>  'arts', // Value for the 'name' attribute of the select element
    'orderby'         =>  'name', // Order drop-down options
    'value_field'     =>  'slug', // Term field that should be used to populate the 'value' attribute of the option elements
                                  // Accepts: 'term_id', 'name', 'slug', 'term_group', 'term_taxonomy_id', 'taxonomy', 'description', 'parent', 'count'
    'selected'        =>  $selected, // Value of the option that should be selected. You need to add your own custom $selected
    'hierarchical'    =>  true // Whether to traverse the taxonomy hierarchy
) );