How TO - Online Offline Detection

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Learn how to detect whether the browser is online or offline with JavaScript.

Offline Detection

The onLine property of the Navigator object returns a Boolean value that specifies whether the browser is in online or offline mode:

Example

Find out whether the browser is online:

var x = "Is the browser online? " + navigator.onLine;
Try it Yourself »

Read more about the Navigator Object in our JavaScript Navigator Tutorial.


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