I am using the value of a field in the page as a variable. 
I am trying to use it in the page somewhere else but I think that there is a problem with the cache because the value is sometimes available and sometimes not.

I have the following:

    $elements['#attached']['drupalSettings']['pdf_app_height'] = $password;

and then in a .js file I have:

    (function ($, Drupal, drupalSettings) {
    'use strict';
 
     Drupal.behaviors.pdf_appAccessData = {
  
    attach: function (context) {
      window.xx = drupalSettings.pdf_app_height;
      }
     };
    })(jQuery, Drupal, drupalSettings);

I am using on the page somewhere else the following javascript code:

    alert(xx); 

Sometimes it is showing the right value and sometimes undefined. Any ideas?

I have seen the answer if we are talking about configuration changes (https://drupal.stackexchange.com/questions/205867/how-do-i-avoid-having-to-clear-the-cache-when-changing-a-module-configuration-pa?noredirect=1&lq=1) but I don't know how to use it here.