JS DOM Reference Manual

JavaScript Storage Object

lengthStorage length attribute

The length property of the storage object is a read-only property that returns the number of data items stored in the given Storage object.localStorageObject orsessionStorrageObject.

Syntax:

localStorage.length

sessionStorage.length

var x = localStorage.length;

Browser Compatibility

The numbers in the table specify the first browser version that fully supports the length property:

Technical Details

More Examples

The following function adds two data items to the session storage of the current domain and then returns the number of items in the storage:

function myFunc() {
　　sessionStorage.setItem(&39;name&39;, &39;Seagull&39;);
　　sessionStorage.setItem(&39;age&39;, &39;22');
　　var x = sessionStorage.length;
}

Related References

HTML Tutorial:Web Storage API

Window (Window) Reference:window.localStorage Property

Window (Window) Reference:window.sessionStorage Property

JavaScript Storage Object