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HTML | Window length Property

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  • Last Updated : 05 Aug, 2022

The Window length property is used for returning the number of <iframe> elements in the current window. It is a read-only property and it returns a number which represents the number of frames in the current window.

Syntax:  

window.length

Return Value: It returns a numeric value which represents the number of frames in the current window

Below program illustrates the Window length Property :
Returning the number of <iframe> elements in the current window.

html




<!DOCTYPE html>
<html>
<head>
    <title>
      Window length Property in HTML
    </title>
    <style>
        h1 {
            color: green;
        }
         
        h2 {
            font-family: Impact;
        }
         
        body {
            text-align: center;
        }
    </style>
</head>
 
<body>
    <h1>GeeksforGeeks</h1>
    <h2>Window length Property</h2>
    <iframe src=
    </iframe>
    <iframe src=
    </iframe>
     
<p>
      For returning the number of iframe elements
      in the current window, double click the
      "Check Frames" button:
    </p>
 
    <button ondblclick="frame()">
      Check Frames
    </button>
    <p id="count"></p>
 
    <script>
        function frame() {
            var c = window.length;
            document.getElementById("count").innerHTML = c;
        }
    </script>
</body>
</html>                                          

Output: 

After clicking the button:

Supported Browsers: The browsers supported by Window length Property are listed below:  

  • Google Chrome 1
  • Edge 12
  • Internet Explorer 4
  • Firefox 1
  • Opera 12.1
  • Safari 1

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