The WindowEventHandlers.onstorage property contains an event handler that runs when the storage event fires. This occurs when a storage area is changed (e.g. a new item is stored.)


windowObj.onstorage = function() { ... };


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


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

Browser compatibility

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!

Feature Chrome Edge Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support ? (Yes) 45 (45) ? ? ?
Feature Android Android Webview Edge Firefox Mobile (Gecko) Firefox OS IE Mobile Opera Mobile Safari Mobile Chrome for Android
Basic support ? ? (Yes) 45.0 (45) ? ? ? ? ?

Document Tags and Contributors

 Contributors to this page: erikadoyle, teoli, chrisdavidmills
 Last updated by: erikadoyle,