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Clearing Data in Windows Store Apps

Posted by Deepak Arora Articles | Windows Store Apps November 07, 2012
In this article I describe how to create a Windows Store App for clear Application Data using JavaScript.
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Introduction

In this article I describe how to create a Windows Store App to clear Application Data using JavaScript. We use Windows.Storage.ApplicationData.current.clearAsync to clear data from Application Data. I assume you can create a simple Windows Store App using JavaScript. For more help visit Simple Windows Store Apps using JavaScript.

To start the creation of the app, add two JavaScript pages by right-clicking on the js folder in the Solution Explorer and select Add > new item > JavaScript Page and then give an appropriate name. In the same way, add one HTML page to your project.

clear-app-data-in-windows-store-apps.jpg

Write the following code in default.html:

<!DOCTYPE html>

<html>

<head>

    <meta charset="utf-8" />

    <title>app</title>

    <link rel="stylesheet" href="//Microsoft.WinJS.1.0/css/ui-light.css" />

    <script src="//Microsoft.WinJS.1.0/js/base.js"></script>

    <script src="//Microsoft.WinJS.1.0/js/ui.js"></script>

    <link rel="stylesheet" href="/css/default.css" />

    <script src="/js/script1.js"></script>

    <script src="/js/default.js"></script>

</head>

<body role="application" style="background-color: lightcyan">

    <center><div id="rootGrid">

        <div id="content">

            <h1 id="featureLabel"></h1>

            <div id="contentHost"></div>

        </div>

       </div></center>

</body>

</html>

Write the following code in default.js:
 

(function () {

    "use strict";

    var appTitle = "ApplicationData";

    var pages = [

        { url: "page.html" }

    ];

    function activated(eventObject) {

        if (eventObject.detail.kind === Windows.ApplicationModel.Activation.ActivationKind.launch) {

            eventObject.setPromise(WinJS.UI.processAll().then(function () {

                var url = WinJS.Application.sessionState.lastUrl || pages[0].url;

                return WinJS.Navigation.navigate(url);

            }));

        }

    }

    WinJS.Navigation.addEventListener("navigated", function (eventObject) {

        var url = eventObject.detail.location;

        var host = document.getElementById("contentHost");

        host.winControl && host.winControl.unload && host.winControl.unload();

        WinJS.Utilities.empty(host);

        eventObject.detail.setPromise(WinJS.UI.Pages.render(url, host, eventObject.detail.state).then(function () {

            WinJS.Application.sessionState.lastUrl = url;

        }));

    });

    WinJS.Namespace.define("App", {

        appTitle: appTitle,

        pages: pages

    });

    WinJS.Application.addEventListener("activated", activated, false);

    WinJS.Application.start();

})(); 


Write the following code in page.html:
 

<!DOCTYPE html>

<html>

<head>

    <title></title>

    <link rel="stylesheet" href="/css/default.css" />

    <script src="/js/script.js"></script>

</head>

<body>

    <button id="clear">Clear</button>

    <div data-win-control="App.pageOutput">

        <div class="item" id="clearOutput"></div>

    </div>

</body>

</html>


Write the following code in script.html:

(function () {

    "use strict";

    var page = WinJS.UI.Pages.define("page.html", {

        ready: function (element, options) {

            document.getElementById("clear").addEventListener("click", clear, false);

        }

    });

    function clear() {

        Windows.Storage.ApplicationData.current.clearAsync().done(function () {

            document.getElementById("clearOutput").innerText = "ApplicationData has been cleared.  Visit the other pages to see that their data has been cleared.";

        }, function (err) {

            document.getElementById("clearOutput").innerText = "Unable to clear settings, make sure all files are closed.";

        });

    }

})();


Output:

clear-app-data-in-windows-store-app.jpg

Summary

In this app I described how to Clear Application Data in a Windows Store App using JavaScript. I hope this article has helped you to understand this topic. Please share if you know more about this. Your feedback and constructive contributions are welcome.
 

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