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DOM : modal form - HTML

<!DOCTYPE html>
<html>

<head>
  <meta charset="utf-8">
  <link rel="stylesheet" href="style.css">
</head>

<body style="height:3000px">
<h2>Click the button below</h2>
<input type="button" value="Click to show the form" id="show-button">

  <div id="prompt-form-container">
    <form id="prompt-form">
      <div id="prompt-message"></div>
      <input name="text" type="text">
      <input type="submit" value="Ok">
      <input type="button" name="cancel" value="Cancel">
    </form>
  </div>

<script>
  function showCover() {
    let coverDiv = document.createElement('div');
    coverDiv.id = 'cover-div';
   
    document.body.style.overflowY = 'hidden';
    document.body.append(coverDiv);
  }
 
  function hideCover(){
    document.getElementById('cover-div').remove();
    document.body.style.overflowY = '';
  }
 
  function showPrompt(text, callback){
    showCover();
    let form = document.getElementById('prompt-form');
    let container = document.getElementById('prompt-form-container');
    document.getElementById('prompt-message').innerHTML = text;
    form.text.value = '';
   
    function complete(value){
    hideCover();
    container.style.display='none';
    document.onkeydown = null;
    callback(value); //call back is alert() here
    }
   
    form.onsubmit = function() {
      //if the promptor passes ok
      let value = form.text.value;
      if(value == '') return false; // ignore empty submit
   
      complete(value);
      return false;
    };
   
    form.cancel.onclick = function(){
      complete(null);
    };
   
    document.onkeydown = function(e) {
      if(e.key == 'Escape') {//if escape key was pressed
        complete(null);
      }
    };
   
      let lastElem = form.elements[form.elements.length - 1];
      let firstElem = form.elements[0];

      lastElem.onkeydown = function(e) {
        if (e.key == 'Tab' && !e.shiftKey) {
          firstElem.focus();
          return false;
        }
      };

      firstElem.onkeydown = function(e) {
        if (e.key == 'Tab' && e.shiftKey) {
          lastElem.focus();
          return false;
        }
      };
   
    container.style.display = 'block';
    form.elements.text.focus();
  }
    document.getElementById('show-button').onclick = function() {
      showPrompt("Enter something<br>...smart :)", function(value) {
        alert("You entered: " + value);
      });
    };
</script>

</body>

</html>
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