Why is the jquery script not executing?

Question

JavaScript

Friends, when loading the site, I load the php file via Ajax in which the tpl file is loaded

<script async>document.addEventListener("DOMContentLoaded", function(event) { $.ajax({ url:'/ajax/cities.php', success: function(mes){ $('.footer1512-container').before(mes);}});});</script>

cities.php

<?
session_start();
  require_once('../api/Simpla.php');
  $simpla = new Simpla();
  $all_cities = $simpla->cities->all_cities();
  if( isset($_SERVER['HTTPS'] ) ) { 
  $simpla->design->assign('protocol',	'https://'); }
  else { $simpla->design->assign('protocol',	'http://');}
  $text = $_SERVER['HTTP_REFERER'];
  $array = explode("/",$text); // перерабатываем строку в массив
  $array = array_slice($array,3); // выбираем первые 5 слов-элементов
  $array = implode("/",$array);
  $domen=explode('.',$_SERVER['SERVER_NAME']);
  if(sizeof($domen)>2) {$domen=substr($_SERVER['SERVER_NAME'],strpos($_SERVER['SERVER_NAME'],'.')); preg_match("/[^\.\/]+\.[^\.\/]+$/", $domen, $matches); $domen = ".".$matches[sizeof($matches)-1];} else $domen = ".".$_SERVER['SERVER_NAME'];
  $simpla->design->assign('domen',	$domen);
  $simpla->design->assign('script',	$array);
  $simpla->design->assign('all_cities',  $all_cities);
  $result = $simpla->design->fetch('setcity.tpl');
  header("Content-type: application/json; charset=UTF-8");
  header("Content-Encoding: gzip");
  header("Cache-Control: must-revalidate");
  header("Pragma: cache");
  header("Expires: -1");	
  print gzencode(json_encode($result), 9);

it’s not worth delving into the essence of the code, but in the end we load the TPL in front of the basement block.

$result = $simpla->design->fetch('setcity.tpl');

Thus, further this tpl needs to be loaded by a pop-up window with this event on the button.

$().ready(function() {
        $('.city_frame').jqm({trigger: '.city_btn'}).addClass('show');
      });

But for some reason it doesn't work. How to make friends?