Javascript DOM onoffline Event

Introduction

Execute a JavaScript when the browser starts to work offline:

Open the File menu and click on "Work Offline" to toggle between working online and offline.

The ononline and onoffline events are supported in Firefox.

<!DOCTYPE html>
<html>
<body ononline="onFunction()" onoffline="offFunction()">
<p id="demo"></p>
<script>
function onFunction() {//from   ww  w .ja  v  a2 s .c  o m
  document.getElementById("demo").innerHTML = "Your browser is working online.";
}

function offFunction() {
  document.getElementById("demo").innerHTML = "Your browser is working offline.";
}
</script>

</body>
</html>

The onoffline event occurs when the browser starts to work offline.

The onoffline event is the opposite of the ononline event.

Bubbles:	No
Cancelable:	No
Event type:	Event
Supported HTML tags:	<body>

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Javascript DOM onmouseup Event via addEventListener() method
Javascript DOM onmouseup Event via HTML Tag onmouseup attribute
Javascript DOM onmouseup Event via HTML Tag onmouseup function
Javascript DOM onoffline Event via addEventListener() method
Javascript DOM onoffline Event via HTML Tag onoffline attribute

Javascript DOM onoffline Event

Introduction

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