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.