Data Adapter in Windows Store App

In this article I describe how to create a Windows Store App for Data Adapter using JavaScript.


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.