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HTML | Navigator onLine Property

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  • Last Updated : 10 Aug, 2022

The Navigator onLine property is used for returning a Boolean value which specifies whether a browser is in the online or offline mode. 
It is a read-only property which returns true if the browser is in online mode or false if it is in the offline mode.

Syntax: 

navigator.onLine

Return Value: A Boolean, indicating whether the browser is in online or offline mode.It returns true if the browser is online, otherwise it returns false

Below program illustrates the Navigator onLine Property :
Checking whether the browser is in the online or offline mode.

HTML




<!DOCTYPE html>
<html>
<head>
    <title>
      Navigator onLine Property in HTML
    </title>
    <style>
        h1 {
            color: green;
        }
         
        h2 {
            font-family: Impact;
        }
         
        body {
            text-align: center;
        }
    </style>
</head>
 
<body>
    <h1>GeeksforGeeks</h1>
    <h2>Navigator onLine Property</h2>
     
<p>
      For checking the browser's mode,
      double click the "Check Mode" button:
    </p>
 
    <button ondblclick="checkmode()">
      Check Mode
    </button>
 
    <p id="mode"></p>
 
    <script>
        function checkmode() {
 
            // We use navigator.onLine to check if browser is online
            var o =
                "Is the browser in online mode? " + navigator.onLine;
            document.getElementById("mode").innerHTML = o;
        }
    </script>
</body>
</html>

Output: 
Before clicking the button:

After clicking the button:

Supported Browsers: The browser supported by Navigator onLine are listed below: 

  • Google Chrome 1
  • Edge 12
  • Internet Explorer 4
  • Firefox 1.5
  • Opera 3
  • Apple Safari 4

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