Reply To: Taxonomy field – only show children of a parent category

• theWorkshop

• December 22, 2014 at 8:45 pm

I found a way round this by using a ‘Choice’ field and dynamically populating it.
Essentially I populate the choice field with the categories I want, I can choose if it is a radio, check or select etc, and then on update/publish of the post I get the selections and save them back to the post.

Using this function you can dynamically populate the choice field: http://www.advancedcustomfields.com/resources/dynamically-populate-a-select-fields-choices/

I then used the save_post function to save the data back to the post. http://www.advancedcustomfields.com/resources/acfsave_post/

/**
 * dynamically set options for date select field
 * @param array $field
 * @return type
 * @see http://www.advancedcustomfields.com/resources/dynamically-populate-a-select-fields-choices/
 */
function my_acf_date_field($field) {
    //get child categories of category date
    $args = array(
        'type' => 'post',
        'child_of' => 8, //date category parent
        'parent' => '',
        'orderby' => 'name',
        'order' => 'ASC',
        'hide_empty' => 0,
        'hierarchical' => 1,
        'exclude' => '',
        'include' => '',
        'number' => '',
        'taxonomy' => 'category',
        'pad_counts' => false
    );
    //get the child categores 
    $categories = get_categories($args);

    //array of choices to add to field
    $choices = array();

    /**
     * add each category to $choices array
     */
    foreach ($categories as $category) {
        // var_dump($category);
        $id = $category->cat_ID;//set value as category id
        $name = $category->cat_name;//label as category name
        $choices[$id] = $name;
    }

    //add choices to field
    $field['choices'] = $categories;
    return $field;
}

// acf/load_field/name={$field_name} - filter for a specific field based on it's name
add_filter('acf/load_field/name=date', 'my_acf_date_field');

/**
 * Save the data to the post
 * @param type $post_id
 * @return type
 * @see http://www.advancedcustomfields.com/resources/acf_save_post/
 */
function my_acf_save_post($post_id) {

    // bail early if no ACF data
    if (empty($_POST['acf'])) {
        return;
    }

    //array of category id's
    $categoryIds = array();

    //value of 'date' field is the cat_id
    $dateCatId = get_field("date");//http://www.advancedcustomfields.com/resources/get_field/
    array_push($categoryIds, $dateCatId);

    //set value of category fields onto post
    //http://codex.wordpress.org/Function_Reference/wp_set_post_categories
    wp_set_post_categories($post_id, $categoryIds);
}

// run before ACF saves the $_POST['acf'] data
//add_action('acf/save_post', 'my_acf_save_post', 1);

// run after ACF saves the $_POST['acf'] data
add_action('acf/save_post', 'my_acf_save_post', 20);