ACF field population functions

/*

Meeting page
 Populate dropdown with list of committees
 Use AJAX to get location associated with committee and populate as default value (may be overwritten by user)
 Properly save settings

*/

// 1. Populates committee choices
function acf_load_committee_choices( $field ) {

    // reset choices
    $field['choices'] = array();

    // loop through committees and put titles in array, excluding inactive committees
	$committees = get_posts(array(
			'numberposts' => -1,
			'post_type' => 'committee',
			'meta_key' => 'committee_status',
			'meta_value' => 'active',
			'orderby' => 'menu_order',
			'order' => 'ASC'
		));

	foreach ($committees as $committee):
		$committee_names[] = get_field('committee_name', $committee);
	endforeach;

	// loop through array and add to field 'choices'
    if( is_array($committee_names) ) {
        foreach( $committee_names as $choice ) {
            $field['choices'][ $choice ] = $choice;
        }
    }

    // return the field
    return $field;
}
// specify that
add_filter('acf/load_field/name=meeting_committee', 'acf_load_committee_choices');



// 2. Enqueues script that makes AJAX request which will return list of areas for selected country.

function acf_admin_enqueue( $hook ) {

  $type = get_post_type(); // Check current post type
  $types = array( 'meeting' ); // Allowed post types

  if( !in_array( $type, $types ) )
      return; // Only applies to post types in array

  wp_enqueue_script( 'populate-location', get_stylesheet_directory_uri() . '/js/autopopulate.js' );

  wp_localize_script( 'populate-location', 'pl_vars', array(
        'pl_nonce' => wp_create_nonce( 'pl_nonce' ), // Create nonce which we later will use to verify AJAX request
       // Used to save settings
		'selected_committee' => get_field('selected_committee', $current_post->ID),
		'selected_location' => get_field('selected_location', $current_post->ID)
      )
  );
}
add_action( 'admin_enqueue_scripts', 'acf_admin_enqueue' );



// 3. Returns default location for selected committee

function location_by_committee( $selected_committee ) {

	// Verify nonce
	if( !isset( $_POST['pl_nonce'] ) || !wp_verify_nonce( $_POST['pl_nonce'], 'pl_nonce' ) )
		die('Permission denied');

	// Get committee var
	$selected_committee = $_POST['meeting_committee'];

	// Get names and locations from Committee pages—no need to filter here beyond post type.
	$committees = get_posts(array(
		'numberposts' => -1,
		'post_type' => 'committee'
	));

	// Loop and get values
	foreach ($committees as $committee):
		$committee_names[] = get_field('committee_name', $committee);
		$committee_locations[] = get_field('committee_location', $committee);
	endforeach;

	// Combine name and location arrays
	$locations = array();

	// $locations = array_combine( $committee_names, $committee_locations ); // PHP 5+ only...should work, though
	// Alt version for < PHP 5
	foreach($locations as $key => $value):
  		$locations[$committee_names] = $committee_locations;
  	endforeach;


/* Manual associative array to test if constructing array is the problem...but this doesn't work, either
$locations = array(
	'General Board' => 'boardroom',
	'Land Use and Economic Development' => 'Community Center',
	'Outreach' => 'home'
);
*/



	// Returns default location by committee selected if selected committee exists in array
	if (array_key_exists( $selected_committee, $locations)) {

	    // Convert areas to array
	    $arr_data = explode( ', ', $locations[ $selected_committee ] );
	    return wp_send_json($arr_data);

	} else {

	    $arr_data = array();
	    return wp_send_json($arr_data);
	}

	die();

}

add_action('wp_ajax_pl_add_location', 'location_by_committee');
add_action('wp_ajax_nopriv_pl_add_location', 'location_by_committee');