localStorage

Provides access to a W3C Storage interface (http://dev.w3.org/html5/webstorage/#the-localstorage-attribute)

var storage = window.localStorage;

Methods

  • key: Returns the name of the key at the position specified.
  • getItem: Returns the item identified by it's key.
  • setItem: Saves and item at the key provided.
  • removeItem: Removes the item identified by it's key.
  • clear: Removes all of the key value pairs.

Details

localStorage provides an interface to a W3C Storage interface. It allows one to save data as key-value pairs.

Note: window.sessionStorage provides the same interface, but is cleared between app launches.

Supported Platforms

  • Android
  • BlackBerry WebWorks (OS 6.0 and higher)
  • iPhone
  • Windows Phone 7

Key Quick Example

var keyName = window.localStorage.key(0);

Set Item Quick Example

window.localStorage.setItem("key", "value");

Get Item Quick Example

var value = window.localStorage.getItem("key");
// value is now equal to "value"

Remove Item Quick Example

window.localStorage.removeItem("key");

Clear Quick Example

window.localStorage.clear();

Full Example

<!DOCTYPE html>
<html>
  <head>
    <title>Contact Example</title>

    <script type="text/javascript" charset="utf-8" src="cordova-1.6.0.js"></script>
    <script type="text/javascript" charset="utf-8">

    // Wait for Cordova to load
    //
    document.addEventListener("deviceready", onDeviceReady, false);

    // Cordova is ready
    //
    function onDeviceReady() {
        window.localStorage.setItem("key", "value");
        var keyname = window.localStorage.key(i);
        // keyname is now equal to "key"
        var value = window.localStorage.getItem("key");
        // value is now equal to "value"
        window.localStorage.removeItem("key");
        window.localStorage.setItem("key2", "value2");
        window.localStorage.clear();
        // localStorage is now empty
    }


    </script>
  </head>
  <body>
    <h1>Example</h1>
    <p>localStorage</p>
  </body>
</html>

Windows Phone 7 Quirks

  • dot notation is NOT available on Windows Phone. Be sure to use : window.localStorage.setItem/getItem, and not the w3 spec defined calls to window.localStorage.someKey = 'someValue';