HTML DOM MouseEvent offsetX Property

HTML Web Development Front End Technology

The HTML DO MouseEvent offsetX property returns the horizontal (x) coordinate of the mouse pointer relative to the target element if a mouse event was triggered. Use with offsetY to get the vertical coordinate as well.

Following is the syntax −

Returning reference to the offsetX object

MouseEventObject.offsetX

Let us see an example of MouseEvent offsetX property −

Example

Live Demo

<!DOCTYPE html>
<html>
<head>
<title>MouseEvent offsetX</title>
<style>
   * {
      padding: 2px;
      margin:5px;
   }
   form {
      width:70%;
      margin: 0 auto;
      text-align: center;
   }
   #outer {
      width:70%;
      margin: 0 auto;
      padding: 0;
      text-align: center;
      border:1px solid black;
      height: 105px;
      background-color: #28a745;
   }
   input[type="button"] {
      border-radius: 10px;
   }
   #upper {
      border-bottom: 1px solid black;
      height: 40px;
      margin: 0 0 15px 0;
      background-color: #DC3545;
   }
   #lower {
      border-top: 1px solid black;
      height: 40px;
      margin: 15px 0 0 0;
      background-color: #DC3545;
   }
</style>
</head>
<body>
   <form>
      <fieldset>
         <legend>MouseEvent-offsetX</legend>
         <div id="outer">
         <div id="upper"><h2>Danger</h2></div>
         <div id="lower"><h2>Danger</h2></div>
         </div>
         <input type="button" id="start" value="Start" onclick="gameStart()">
         <div id="divDisplay"></div>
      </fieldset>
   </form>
<script>
   var divDisplay = document.getElementById('divDisplay');
   var gameDisplay = document.getElementById('outer');
   function playGame(event) {
      var x = event.offsetX;
      var y = event.offsetY;
         if(y > 45 && y < 60){
            divDisplay.textContent = 'Keep Going!';
               if(x === 272){
                  divDisplay.textContent = 'Congrats! You Did it!';
                  gameDisplay.removeEventListener('mousemove', playGame);
               }
         }
         else{
            divDisplay.textContent = 'You moved to DANGER area. You loose!';
            gameDisplay.removeEventListener('mousemove', playGame);
         }
   }
   function gameStart(){
      gameDisplay.addEventListener('mousemove',playGame);
   }
</script>
</body>
</html>