Dynamically populate multiple ACF Select fields

• grazzeee

• August 4, 2022 at 2:26 pm

I have two fields that i need to populate with custom select options.

Field one is location_name and field two is course_length. They appear multiple times on one page. The fields are displayed on a options page.

When i use the following code to populate the select fields with custom options the page crashes and does not load. ( 404 ).

I cant work out what iv done that causes this to happen.

    function acf_load_location_names_field_choices( $field ) {
    
        // reset choices
        $field['choices'] = array();
    
        // create array
        $store_location_names = [];

        // query posts
        $args = new WP_Query( array(
            'post_type' => 'cpt_opportunities',
            'post_status' => array('publish', 'pending', 'draft', 'auto-draft'),
        ));
    
        // loop through posts
        if ( $args->have_posts() ) :
            while ( $args->have_posts() ) : $args->the_post();
    
            $location_of_course = get_field('trip_summary_location_of_course');                

            if(!in_array($location_of_course, $store_location_names)){
                array_push($store_location_names, $location_of_course );
            }

            endwhile; wp_reset_postdata();
        else : endif;

        // create select field options from array
        foreach ( $store_location_names as $location_name) {
            $field['choices'][ $location_name ] = $location_name;
        }

        // return the field
        return $field;
        
    }
    
    add_filter('acf/load_field/name=location_name', 'acf_load_location_names_field_choices');

    function acf_load_course_lengths_field_choices( $field ) {
    
        // reset choices
        $field['choices'] = array();
    
        // create array
        $store_course_lengths = [];

        // query posts
        $args = new WP_Query( array(
            'post_type' => 'cpt_opportunities',
            'post_status' => array('publish', 'pending', 'draft', 'auto-draft'),
        ));
    
        // loop through posts
        if ( $args->have_posts() ) :
            while ( $args->have_posts() ) : $args->the_post();
    
            $get_course_length = get_field('trip_summary_course_length');                

            if(!in_array($get_course_length, $store_course_lengths)){
                array_push($store_course_lengths, $get_course_length );
            }

            endwhile; wp_reset_postdata();
        else : endif;

        // create select field options from array
        foreach ( $store_course_lengths as $course_length) {
            $field['choices'][ $course_length ] = $course_length;
        }

        // return the field
        return $field;
        
    }
    
    add_filter('acf/load_field/name=course_length','acf_load_course_lengths_field_choices');

• John Huebner

• August 24, 2022 at 2:00 pm

The first issue that I see is that if you are going to do a loop like this inside of a function

if ( $args->have_posts() ) :
            while ( $args->have_posts() ) : $args->the_post();

then you must define must add

global $post;

in your function before you do so.

Do you have debugging turned on so you can see the actual errors that are crashing your page?