HTML | DOM ononline Event

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

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

Syntax:

In HTML:
```
<element ononline="myScript">
```
In JavaScript:
```
object.ononline = function(){myScript};
```
In JavaScript, using the addEventListener() method:
```
object.addEventListener("online", myScript);
```

Example: Using the addEventListener() method

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

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

Firefox 3.0

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Vijay Sirra

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