นี่คือตัวอย่าง ฉันได้สร้างGistด้วยรหัสทั่วไปมากขึ้น
add_action('add_meta_boxes', 'my_custom_metabox');
function my_custom_metabox() {
add_meta_box('custom-taxonomy-dropdown','Brands','taxonomy_dropdowns_box','post','side','high');
}
function taxonomy_dropdowns_box( $post ) {
wp_nonce_field('custom-dropdown', 'dropdown-nonce');
$terms = get_terms( 'brands', 'hide_empty=0');
$object_terms = wp_get_object_terms( $post->ID, 'brands', array('fields'=>'ids'));
// you can move the below java script to admin_head
?>
<script type="text/javascript">
jQuery(document).ready(function() {
jQuery('#custombrandoptions').change(function() {
var custombrand = jQuery('#custombrandoptions').val();
if ( custombrand == '0') {
jQuery('#custommodeloptions').html('');
jQuery('#modelcontainer').css('display', 'none');
} else {
var data = {
'action':'get_brand_models',
'custombrand':custombrand,
'dropdown-nonce': jQuery('#dropdown-nonce').val()
};
jQuery.post(ajaxurl, data, function(response){
jQuery('#custommodeloptions').html(response);
jQuery('#modelcontainer').css('display', 'inline');
});
}
});
});
</script>
<?php
echo "Brand:";
echo "<select id='custombrandoptions' name='custombrands[]'>";
echo "<option value='0'>None</option>";
foreach ( $terms as $term ) {
if ( $term->parent == 0) {
if ( in_array($term->term_id, $object_terms) ) {
$parent_id = $term->term_id;
echo "<option value='{$term->term_id}' selected='selected'>{$term->name}</option>";
} else {
echo "<option value='{$term->term_id}'>{$term->name}</option>";
}
}
}
echo "</select><br />";
echo "<div id='modelcontainer'";
if ( !isset( $parent_id)) echo " style='display: none;'";
echo ">";
echo "Models:";
echo "<select id='custommodeloptions' name='custombrands[]'>";
if ( isset( $parent_id)) {
$models = get_terms( 'brands', 'hide_empty=0&child_of='.$parent_id);
foreach ( $models as $model ) {
if ( in_array($model->term_id, $object_terms) ) {
echo "<option value='{$model->term_id}' selected='selected'>{$model->name}</option>";
} else {
echo "<option value='{$model->term_id}'>{$model->name}</option>";
}
}
}
echo "</select>";
echo "</div>";
}
add_action('save_post','save_my_custom_taxonomy');
function save_my_custom_taxonomy( $post_id ) {
if ( defined('DOING_AUTOSAVE') && DOING_AUTOSAVE )
return;
if ( !wp_verify_nonce($_POST['dropdown-nonce'], 'custom-dropdown'))
return;
$brands = array_map('intval', $_POST['custombrands']);
wp_set_object_terms($post_id, $brands, 'brands');
}
add_action('wp_ajax_get_brand_models', 'get_brand_models');
function get_brand_models() {
check_ajax_referer('custom-dropdown', 'dropdown-nonce');
if (isset($_POST['custombrand'])) {
$models = get_terms( 'brands', 'hide_empty=0&child_of='. $_POST['custombrand']);
echo "<option value='0'>Select one</option>";
foreach ($models as $model) {
echo "<option value='{$model->term_id}'>{$model->name}</option>";
}
}
die();
}