HTML | DOM onoffline Event

The DOM onoffline event occurs on offline work of browser. The onoffline event is a conflict with the ononline event.

Note: navigator.onLine property is used to check the mode of browser.

Syntax:



  • In HTML:
    <element onoffline="myScript">
  • In JavaScript:
    object.onoffline = function(){myScript};
  • In JavaScript, using the addEventListener() method:
    object.addEventListener("offline", myScript);

Example: Using the addEventListener() method

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code

<!DOCTYPE html>
<html>
  
<head>
    <title>
        HTML DOM onoffline Event
    </title>
</head>
  
<body>
    <h1>
      GeeksforGeeks
  </h1>
    <h2>
      HTML DOM onoffline Event
  </h2>
  
    <script>
        window.addEventListener("online", onlineGFG);
        window.addEventListener("offline", offlineGFG);
  
        function onlineGFG() {
            alert("Online");
        }
  
        function offlineGFG() {
            alert("Offline");
        }
    </script>
  
</body>
  
</html>

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Supported Browsers: The browsers supported by HTML DOM onoffline Event are listed below:

  • Firefox

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