Introductions

In this article I describe how to create a Windows Store App for Data Adapter using JavaScript. This app demonstrates how to create a data adapter to interface with a web service. A data adapter is the component to interface between the list view and the supply of data, enabling virtualization.

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 one JavaScript page by right-clicking on the js folder in the Solution Explorer and select "Add" > "New item" > "JavaScript Page" and then provide an appropriate name. In the same way, add a HTML page to your project.

adopter-in-windows--store-app.jpg

Write the following code in the default.html:

<!DOCTYPE html>

<html>

<head>

<meta charset="utf-8" />

<title></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/default.js"></script>

</head>

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

<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 the default.js:

(function () {

"use strict";

var AppTitle = "";

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).done(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 the page.html:

<!DOCTYPE html>

<html>

<head>

<title></title>

<link rel="stylesheet" href="/css/page1.css" />

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

</head>

<body>

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

<div>

<label for="devkey">

ID:

</label>

<input id="devkey" placeholder="Enter your Id" />

<button class="action secondary" id="savekey">

Click Here

</button>

</div>

<br />

<div id="queryCtrls">

<label for="query">

Type here for search

</label>

<input id="query" value="Deepak Arora" />

<button class="action" id="runquery">

Search

</button>

</div>

</div>

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

<div id="itemTemplate" data-win-control="WinJS.Binding.Template">

<div class="itemTempl">

<img data-win-bind="src: thumbnail" alt="Databound image" />

<span class="content" data-win-bind="innerText: title"></span>

</div>

</div>

<div id="listview1" class="box"

data-win-control="WinJS.UI.ListView"

data-win-options="{ selectionMode: 'none', tapBehavior: 'none', swipeBehavior: 'none', layout: { type: WinJS.UI.GridLayout, maxRows: 2 } }"

></div>

</div>

</body>

</html>


Write the following code in the script.js:

(function () {

"use strict";

var page = WinJS.UI.Pages.define("/html/page1.html", {

ready: function (element, options) {

WinJS.Utilities.query("#savekey").listen("click", saveKey);

WinJS.Utilities.query("#runquery").listen("click", doSearch);

loadKey();

}

});

function saveKey() {

var devkey = document.getElementById("devkey").value;

if (devkey !== "" && devkey.length > 12) {

try {

var localSettings = Windows.Storage.ApplicationData.current.localSettings;

localSettings.values["devkey"] = devkey;

}

catch (err) {

}

toggleControls(true);

doSearch();

} else {

toggleControls(false);

}

}

function doSearch() {

var devkey = document.getElementById("devkey").value;

if (devkey !== "" && devkey.length > 12) {

var searchTerm = document.getElementById("query").value;

var listview = document.getElementById("listview1").winControl;

var myTemplate = document.getElementById("itemTemplate");

var myDataSrc = new bingImageSearchDataSource.datasource(devkey, searchTerm);

listview.itemDataSource = myDataSrc;

listview.itemTemplate = myTemplate;

}

}

})();

Output:

data adopter in-windows-store-app.jpg

Summary:

In this article I described how to create a Windows Store App for Data Adapter using JavaScript. I hope this article has helped you to understand this topic. Please share it. If you know more about this, your feedback and constructive contributions are welcome.