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HTML | DOM WheelEvent deltaZ Property

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  • Last Updated : 11 Jul, 2022

The HTML | DOM WheelEvent deltaZ Property is used to return a positive double value when the web page is scrolled in and returns a negative value when the page is scrolled out else it returns zero. It is a read-only property. 

Syntax: 

event.deltaZ

Return Value: It returns a double value which indicates the scrolling direction of the mouse wheel. 

Example: 

html




<!DOCTYPE html>
<html>
 
<head>
    <title>
      DOM WheelEvent deltaZ Property
  </title>
</head>
 
<body onwheel="Geeks(event)"
      style="text-align: center;
             width: 1000px;">
 
    <h1 style="color: green;">
        GeeksforGeeks
    </h1>
 
    <h2>
        DOM WheelEvent deltaZ Property
    </h2>
 
    <p>Scroll to see effect:</p>
 
    <p id="p"></p>
 
    <script>
        function Geeks(event) {
            var doc = event.deltaZ;
            document.getElementById(
              "p").innerHTML = doc;
        }
    </script>
 
</body>
 
</html>

Output: 

Before Scroll:

  

After Scroll:

  

Supported Browsers: The browsers supported by DOM WheelEvent deltaZ Property are listed below:

  • Google Chrome 31
  • Edge 12
  • Internet Explorer 9
  • Firefox 17
  • Opera 18
  • Safari 8
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