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Other Objects

CSSStyleDeclaration

onoffline Event

Example

Execute a JavaScript when the browser starts to work offline:

<body onoffline="myFunction()">

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Definition and Usage

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

Tip: The onoffline event is the opposite of the ononline event.

Tip: You can also use the navigator.onLine property to find out whether the browser is in online or offline mode.

Browser Support

The numbers in the table specify the first browser version that fully supports the event.

Event
onoffline	Not supported	Deprecated as of IE11 8.0	3.0	Not supported	Not supported

Syntax

In HTML:

<element onoffline="myScript">

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In JavaScript:

object.onoffline=function(){myScript};

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In JavaScript, using the addEventListener() method:

object.addEventListener("offline", myScript);

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Note: The addEventListener() method is not supported in Internet Explorer 8 and earlier versions.

Technical Details

Bubbles:	No
Cancelable:	No
Event type:	Event
Supported HTML tags:	<body>
DOM Version:	Level 3 Events