Web/API/WindowEventHandlers/onstorage

The onstorage property of the WindowEventHandlers mixin is an EventHandler for processing storage events.

The storage event fires when a storage area has been changed in the context of another document.

Syntax

 window.onstorage = functionRef;

Value

functionRef is a function name or a function expression. This function receives a StorageEvent as its sole argument.

Example

This example logs the value for a storage key whenever it changes in another document.

window.onstorage = function(e) {
  console.log('The ' + e.key +
    ' key has been changed from ' + e.oldValue +
    ' to ' + e.newValue + '.');
};

Specifications

Specification	Status	Comment
HTML Living StandardThe definition of 'onstorage' in that specification.	Living Standard

Browser compatibility

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
onstorage	Chrome Full support 1	Edge Full support ≤18	Firefox Full support 45	IE ?	Opera Full support 15	Safari ?	WebView Android Full support ≤37	Chrome Android Full support 18	Firefox Android Full support 45	Opera Android Full support 14	Safari iOS ?	Samsung Internet Android Full support 1.0

Legend

Full support  

Full support

Compatibility unknown  

Compatibility unknown

See also

• Window: storage event

WindowEventHandlers.onstorage by Mozilla Contributors is licensed under CC-BY-SA 2.5.