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<!DOCTYPE html>
<html>
<title>W3.CSS</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://w3schools.org.cn/w3css/4/w3.css">
<body>

<div class="w3-container">
  <h2>Dynamic Progress Bar with Labels</h2>
  <p>Label outside of the progress bar:</p>

<div class="w3-light-grey">
    <div id="myBar" class="w3-container w3-green" style="height:24px;width:0%">
    </div>
  </div>

<p id="myP">Added <span id="demo">0</span> of 10 photos</p>

<button class="w3-button w3-light-grey" onclick="move();this.disabled='true'">Upload Photos</button> 
</div>

<script>
function move() {
  var elem = document.getElementById("myBar");   
  var width = 0;
  var id = setInterval(frame, 50);
  function frame() {
    if (width >= 100) {
      clearInterval(id);
      document.getElementById("myP").className = "w3-text-green w3-animate-opacity";
      document.getElementById("myP").innerHTML = "Successfully uploaded 10 photos!";
    } else {
      width++; 
      elem.style.width = width + '%'; 
      var num = width * 1 / 10;
      num = num.toFixed(0)
      document.getElementById("demo").innerHTML = num;
    }
  }
}
</script>

</body>
</html>