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Binding.List in Windows Store App

By Deepak Middha on Jan 09, 2013
In this article I describe how to create a Windows Store App for Binding.List using JavaScript.

Introduction

In this article I describe how to create a Windows Store App for Binding.List using JavaScript. Binding.List is an in-memory data source with an API like JavaScript Arrays. The App generates a set of random letters and uses a Binding.List to store them.

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 apps, 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.

binding-list_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:lightpink">

    <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>

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

</head>

<body>

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

        <div>

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

                Shuffle Letter

            </button>           

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

                Add letter

            </button>

        </div>

    </div>

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

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

            <div class="latterTempl">

                <h6 class="counter" data-win-bind="innerText: counter"></h6>

                <h1 class="letter" data-win-bind="innerText: letter"></h1>

            </div>

        </div>

        <div id="listView2" class="box win-selectionstylefilled" data-win-control="WinJS.UI.ListView" data-win-options="{ selectionMode: 'multi', reorderable: true,  layout: { type: WinJS.UI.GridLayout, maxRows: 1 } }">

        </div>

    </div>

</body>

</html> 


Write the following code in the script.js:

(function () {

    "use strict";

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

        ready: function (element, options) {

            element.querySelector("#shuffle").addEventListener("click", shufflelatters, false);

            element.querySelector("#addlatter").addEventListener("click", addlatter, false);

            initlatters();

        }

    });

    var _tIndex = 0;

    var _letterSrc = "ABCDEFGHIJKLMNOPQRSTUVWXYZ".split("");

    var lettersList = {};

    function initlatters() {

        var letters = [];

        for (var i = 0; i < 7; i++) {

            letters[i] = generatelatter();

        }

        lettersList = new WinJS.Binding.List(letters);

        var list2 = document.getElementById("listView2").winControl;

        list2.itemDataSource = lettersList.dataSource;

        list2.itemTemplate = document.getElementById("latterTemplate");

        list2.forceLayout();

    }

    function generatelatter() {

        var latter = {

            letter: _letterSrc[Math.floor(Math.random() * _letterSrc.length)],

            counter: _tIndex

        };

        _tIndex++;

 

        return latter;

    }

    function shufflelatters() {

        var count = lettersList.length;

        if (count > 0) {

            for (var itemIndex = 0; itemIndex < count; itemIndex++) {

                var randomIndex = Math.floor(Math.random() * (count - itemIndex));

                lettersList.move(randomIndex, 0);

            }

        }

    }

    function addlatter() {

        var latter = generatelatter();

        lettersList.push(latter);

    }

})(); 


Output:

binding-list_in-windows-store--app.jpg

Summary

In this article I described how to create a Windows Store App for Binding.List 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.

Deepak Middha

Deepak Middha is one time Microsoft MVP(Client App Dev) , working as Sr. Software Developer with lots of hands on experience using ASP.NET 2.0/3.5, AJAX, MVC, C#,  SQL Server 2005/2008/2012, WCF, JQuery and Silverl... Read more

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