How to stop js execution if post parameter is not received?

• 0
  The default js for all pages of the site has a chat refresh function.
  
  

  function updatePosts() {
      $.post(dle_root + "engine/modules/chat/scripts/ajaxLoad.php", {
          ub_id: ub_id
      }, function(s) {
          var e;
          JSON.parse(s).forEach(function(s) {
          Number(s.id) > Number(last_message_id) && (session_user == s.username ? $("#messages-wrapping").append(load_self_message(s.message, s.username)) : $("#messages-wrapping").append(load_message(s.message, s.username))), e = s.id
      }), last_message_id = e
  })
  }
  
  $(document).ready(function() {
  $.post(dle_root + "engine/modules/chat/scripts/ajaxLoad.php", {
      ub_id: ub_id
  }, function(s) {
      JSON.parse(s).forEach(function(s) {
          session_user == s.username ? $("#messages-wrapping").append(load_self_message(s.message, s.username)) : $("#messages-wrapping").append(load_message(s.message, s.username)), last_message_id = s.id
      })
  })
  }), setInterval(updatePosts, 2000);

  
  
  On pages where the chat is not provided, I get a permanent error in the console every 2 seconds:
  Uncaught ReferenceError: ub_id is not defined
  
  How to check for ub_id in js and not execute the script if ub_id is not defined?
  
  Please help.
  
  Thank you!

  JavaScript Olivia Krueger, Feb 15, 2020

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1 Answers
• 0
  I figured it out, did it like this:
  
  
  
  if (typeof ub_id! == 'undefined') {/ * ... * /}

  Anonymous

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