I've a dropdown control that lists all pages of the website.

When I select a page in the dropdown I would update the preview iframe to that page.

There is the following method to change the customizer previewUrl

wp.customize.previewer.previewUrl( url )

But I can't realize how and where exactly I should do this. The dropdown control has transport set to refresh and the preview will refresh automatically everytime the control value changes.

Maybe a solution could be to change the previewUrl before the customizer automatically refresh the preview.

Do you have any suggestions to do this? Thanks in advance.

2 Answers 2


Gonna have a go... say you have a theme option themeoption[id]... instead of setting transport refresh, set it to postMessage instead, and then add this code to create a callback that first gets the page URL via AJAX then sends that back to the previewUrl as you mentioned before refreshing...

function preview_override_loader() {
    function preview_override_script() {
        $adminajax = admin_url('admin-ajax.php');
        echo "wp.customize('themeoption[id]',function(value) {
            value.bind(function(to) {
                console.log('Posted ID: '+to); /* debug point */
                    function(data) {
                        if (data) {
                            console.log('Permalink: '+data); /* debug point */

Then just add a small AJAX function to return the permalink... this is somewhat assuming that the dropdown control is saving/posting a single numeric post ID.

function get_preview_permalink() {
    $postid = $_GET['postid'];
    echo get_permalink($postid);

Untested crazy workaround but it seems like it might do the trick..?


Try this one when you plan to change the current URL from controls panel: wp.customize.previewer.previewUrl( url )

or try this one while you intend to change the URL from preview frame: wp.customize.preview.send( "url", url )

Moreover, here is how to get the current preview URL from the controls panel: wp.customize.previewer.previewUrl()

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