Introduction

In this article I describe how to create a Windows Store App for the ms-appdata protocol using JavaScript. Your HTML can use the ms-appdata protocol to refer to media (images, audio, and video) in the Application Data folder. This app load images from the Local, Roaming, and Temp folders.

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.

ms-appdata-in windows-store-apps.jpg

Write the following code in default.html:

<!DOCTYPE html>

<html>

<head>

<meta charset="utf-8" />

<title>SDK apps</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: lightcoral">

<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 appsTitle = "";

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", {

appsTitle: appsTitle,

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>

<div data-win-control="app.pageInput">

</div>

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

<div id="imagesOutput">

<div id="imagesLocal"></div>

<div id="imagesTemp"></div>

<div id="imagesRoaming"></div>

</div>

</div>

</body>

</html>


Write the following code in script.js:

(function () {

"use strict";

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

ready: function (element, options) {

copyImageToAppDataFolder("appDataLocal.jpg", Windows.Storage.ApplicationData.current.localFolder).done(function () {

appendImage("Local");

}, imagesAsyncError);

copyImageToAppDataFolder("appDataTemp.jpg", Windows.Storage.ApplicationData.current.temporaryFolder).done(function () {

appendImage("Temp");

}, imagesAsyncError);

copyImageToAppDataFolder("appDataRoaming.jpg", Windows.Storage.ApplicationData.current.roamingFolder).done(function () {

appendImage("Roaming");

}, imagesAsyncError);

}

});

function imagesAsyncError(error) {

app.displayError(error);

}

function copyImageToAppDataFolder(imageName, folder) {

return Windows.Storage.StorageFile.getFileFromApplicationUriAsync(Windows.Foundation.Uri("ms-appx:///images/" + imageName))

.then(function (file) {

return file.copyAsync(folder, imageName, Windows.Storage.NameCollisionOption.replaceExisting);

});

}

function appendImage(folder) {

var image = document.createElement("img");

image.src = "ms-appdata:///" + folder + "/appData" + folder + ".jpg";

image.alt = folder;

document.getElementById("images" + folder).appendChild(image);

}

})();


Write the following code in script1.js:

(function () {

var pageOutput = WinJS.Class.define(

function (element, options) {

element.winControl = this;

this.element = element;

new WinJS.Utilities.QueryCollection(element)

.setAttribute("role", "region")

.setAttribute("aria-labelledby", "outputLabel")

.setAttribute("aria-live", "assertive");

element.id = "output";

this._addOutputLabel(element);

this._addStatusOutput(element);

}, {

_addOutputLabel: function (element) {

var label = document.createElement("h2");

label.id = "outputLabel";

label.textContent = "Output";

element.parentNode.insertBefore(label, element);

},

_addStatusOutput: function (element) {

var statusDiv = document.createElement("div");

statusDiv.id = "statusMessage";

element.insertBefore(statusDiv, element.childNodes[0]);

}

}

);

var currentpageUrl = null;

WinJS.Navigation.addEventListener("navigating", function (evt) {

currentpageUrl = evt.detail.location;

});

WinJS.log = function (message, tag, type) {

var statusDiv = document.getElementById("statusMessage");

};

function activated(e) {

WinJS.Utilities.query("#featureLabel")[0].textContent = app.appsTitle;

}

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

WinJS.Namespace.define("app", {

pageOutput: pageOutput

});

})();

Output:

ms-appdata-in windows-store-appss.jpg

Summary

In this app I described the ms-appdata protocol 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.