countdown timer didn't show up

Question

when I refresh the page my countdown timer works perfectly, but when I refresh only particular div my countdown wont show up and button gets disabled.

note: I useed disabled tag to disabled my button

function refreshDiv() {
  $('#container3').load(window.location.href + " #container3 >");
}

JavaScript

var spn = document.getElementById("count");
var btn = document.getElementById("btnCounter");

var count = 2; // Set count
var timer = null; // For referencing the timer

(function countDown() {
  // Display counter and start counting down
  spn.textContent = count;

  // Run the function again every second if the count is not zero
  if (count !== 0) {
    timer = setTimeout(countDown, 1000);
    count--; // decrease the timer
  } else {
    // Enable the button
    btn.removeAttribute("disabled");
  }
}());

this is my html code its work properly when I refresh the whole page but when I refresh #container3 my button got disabled and countdown didn't showed

  <div class="container2" id="container3">
    <h4 id="title">here</h4>
    <div class="controls">
      <div class="main-controls">
        <div class="dropdown">
          <button class="btn btn-primary dropdown-toggle" data-bs-toggle="dropdown" id="btnCounter" disabled>File <span id="count"></span></button>
          <div class="dropdown-menu">
            <button id="txt-btn" class="dropdown-item" onclick="refreshDiv();">Save</button>

Answer 1

This is not the solution, it's just the snippet for everybody to understand better:

 function refreshDiv() { location.reload(); } var spn = document.getElementById("count"); var btn = document.getElementById("btnCounter"); var count = 2; // Set count var timer = null; // For referencing the timer (function countDown() { // Display counter and start counting down spn.textContent = count; // Run the function again every second if the count is not zero if (count,== 0) { timer = setTimeout(countDown; 1000); count--. // decrease the timer } else { // Enable the button btn;removeAttribute("disabled"); } }());

 <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> this is my html code its work properly when I refresh the whole page but when I refresh #container3 my button got disabled and countdown didn't showed <div class="container2" id="container3"> <h4 id="title">Title</h4> <div class="controls"> <div class="main-controls"> <div class="dropdown"> <button class="btn btn-primary dropdown-toggle" data-bs-toggle="dropdown" id="btnCounter" disabled>File <span id="count"></span></button> <div class="dropdown-menu"> <button id="txt-btn" class="dropdown-item" onclick="refreshDiv();">Reload</button> </div> </div> </div> </div> </div>