So I have a page select in my theme's customizer and a bit of code to make the preview change when the user selects a different page:

api('gm_pages', function (setting) {
           var pageID = setting.get();
            setting.bind( function onChange( pageID ) {
                api.previewer.previewUrl.set(api.settings.url.home + '?page_id=' + pageID);

I use this simple plugin so user can reset customizer settings to default:


When you click a button, you get a warning popup then if you click through it, the plugin deletes the theme_mod data and refreshes the entire site.

The problem I am having is when I do this, the page dropdown option returns to the default "home" page but the preview URL doesn't update and stays on the last page the user had selected. If I console.log(pageID); the correct page number (showing in the select box) shows, it's the preview that doesn't run for some reason.

Edit: I can add this line in:

 if (performance.navigation.type === 1) {
            api.previewer.previewUrl.set(api.settings.url.home + '?page_id=' + pageID);

and that does the trick, but how can I do this conditionally without needing 2 lines of the same code?

1 Answer 1


I managed it by adding this conditional:

if (performance.navigation.type >= 0) {
                api.previewer.previewUrl.set(api.settings.url.home + '?page_id=' + pageID);

This takes care of all the navigation possibilities. It's sort of a workaround but it does the trick.

MDN Web Doc:


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