Austin Verburg Austin Verburg - 21 days ago 8x
PHP Question

Get meta box to keep selection after update

I'm building a meta box for one of my custom post types that has a selection option. I'm trying to make it so that when you make a selection and update the post, the option stays selected when the page reloads. I've found a few people on StackOverflow working on the same and I've followed those suggestions but haven't quite figured it out yet. If anyone has any suggestions, any help is appreciated.


function property_info_meta_box() {
add_meta_box('property-info', 'Property', 'property_info_cb', 'properties', 'normal', 'high');
add_action('add_meta_boxes', 'property_info_meta_box');

function property_info_cb($propertyInfo) {

$selectAgent = get_post_meta($propertyInfo->ID, 'select-agent-value', true);


<label for="select-agent-text">Select Agent</label> <br>
<select multiple size="5" name="select-agent" id="select-agent">

<option value="none">None</option>


$args = array(
'post_type' => 'agents',
'posts_per_page' => -1

$posts = new WP_Query($args);

if ( $posts->have_posts() ) : while ( $posts->have_posts() ) : $posts->the_post(); ?>

<option value="<?php the_ID() ?>" <?php selected( $selectAgent, the_ID() ); ?>> <?php the_title(); ?> </option>

<?php endwhile; endif; ?>


<?php }

function add_property_info_fields ($propertyInfoId, $propertyInfo){
if ($propertyInfo->post_type == 'properties') {

update_post_meta($propertyInfoId, 'select-agent-value', $_POST['select-agent']);

add_action('save_post', 'add_property_info_fields', 10, 2);


Shot in the dark here, but you are using the_ID() improperly. This function prints the ID to the screen. You are trying to return the ID for use as a function parameter. You should try something like:

<?php selected( $selectedAgent, get_the_ID() ); ?>

See get_the_ID() vs the_ID()