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.