I want to clear the cache of a plugin on refreshing the preview of the WordPress customizer because I can only see the changes I make if the cache of that plugin is refreshed.

This because the theme mod values are stored in css files that need to have a refresh of the cache before you can see the changes. Since these css files are connected to theme mod values, I need to refresh the cache of the plugin on refreshing the customizer preview.

I have come this far with PHP:

function px_clear_bb_cache() {
do_action( 'customize_save', 'px_clear_bb_cache' );

The cache is now refreshed after saving and closing :( the customizer.

I think I need to hook into the customizer with JS + Ajax but can't figure out how to do this.

Would be great if someone could help me out here.

Basically the PHP command "FLBuilderModel::delete_asset_cache_for_all_posts();" needs to fire every time when refreshing the preview of the customizer.

  • Do you want to clear the plugin cache for all changes, even ones that aren't saved?
    – Welcher
    May 19, 2017 at 10:51
  • Yes for all changes, even unsaved ones.
    – Bob
    May 19, 2017 at 10:58
  • Why are you using do_action ? Shouldn't it be add_action( 'customize_save', 'px_clear_bb_cache' ); ? @Bob
    – CodeMascot
    May 19, 2017 at 11:55

1 Answer 1


Got the solution:

  1. Create a PHP file "purge-bb-cache.php"
  2. Create a JS script like below in functions.php



JS script:

// Add JS to customizer
function print_customizer_js() {     

// Purge BB Cache On Save Customizer
//var ajaxurl = "<?php echo ( get_stylesheet_directory() . '/wp-content/themes/bb-theme-child/script.php' ); ?>";

type: 'POST',
url: '/wp-content/themes/bb-theme-child/assets/purge-bb-cache.php',
success: function(data) {
console.log("Purged BB Cache");
add_action('customize_controls_print_scripts', 'print_customizer_js');

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