Is it possible to make the get_theme_mod work after refresh in the customizer preview pane when it's being called inside a template part by AJAX?

I have a theme that loads the posts on scroll (infinite scroll) and everything works except it doesn't output the updated theme mods in the customizer preview. It only outputs the new theme mods when I hit the save button.

Any idea how to make it update after a refresh as well?

My control settings:

'id'        => 'show_caption',
'type'      => 'select',
'section'   => 'caption',
'transport' => 'refresh',
'default'   => 'top',
'choices'   => array(
  'top'    => __( 'Top', 'my-domain' ),
  'bottom' => __( 'Bottom', 'my-domain' ),


class InfiniteScroll {

  private $query;

  public function __construct( WP_Query $query ) {
    $this->query = $query;
  public function register() {
    add_action( 'wp_ajax_my_infinite_scroll', array( $this, 'handleAjax' ) );
    add_action( 'wp_ajax_nopriv_my_infinite_scroll', array( $this, 'handleAjax' ) );
    add_action( 'wp_enqueue_scripts', array( $this, 'enqueueScripts' ) );

  public function getPosts() {

    $this->query->query( $this->getData() );

    if ( $this->query->have_posts() ) {
      while ( $this->query->have_posts() ) {
        get_template_part( 'template-parts/post/content' );


    return ob_get_clean();

  public function handleAjax() {
    if ( ! check_ajax_referer( 'infinite-scroll-ajax', 'nonce' ) ) {

    wp_send_json_success( $this->getPosts() );

  // ...



echo get_theme_mod( 'show_caption', 'top' );

Ajax request before customize_save:


  • maybe include the customizer setting and relevant code to your question. look into the transport argument for the setting it is possible to use refresh or postMessage for that and tutorials around for both.
    – majick
    Oct 6, 2017 at 23:40
  • @majick Thanks for your fast replay. Sorry for my vague description. I've been searching for this specific issue but didn't find anything related. I've updated my question with code examples but not sure if it's relevant to the issue since I'm stuck.
    – michael
    Oct 7, 2017 at 1:26
  • Ajax requests should include the Customized preview state applied to their responses as of 4.7. You can see the logic in customize-preview.js where it hooks in with jQuery.prefilterAjax(): github.com/WordPress/wordpress-develop/blob/… Oct 7, 2017 at 6:06
  • Do note however that it is not recommended to use admin-ajax on the frontend because the requests are not cached. Oct 7, 2017 at 6:07
  • @WestonRuter I found some documentation here: make.wordpress.org/core/2016/10/12/… I've now added the UUID to my URL, like this '.../admin-ajax.php?customize_changeset_uuid=' + uuid. Still not working.
    – michael
    Oct 7, 2017 at 12:22

1 Answer 1


There is a bug in WordPress 4.8.2 which causes pending customized changes to not be injected into Ajax requests in the preview. This has been fixed in 4.9-alpha via #42162. In the mean time, however, you can do a workaround to modify the requested url with logic like:

// Workaround defect introduced in WordPress 4.8.2 where preview nonce is not included in request.
if ( 'undefined' !== typeof _wpCustomizeSettings ) {
    urlParser = document.createElement( 'a' );
    urlParser.href = url;
    urlParser.search += '&customize_preview_nonce=' + _wpCustomizeSettings.nonce.preview;
    url = urlParser.href;

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