Binding.List in Windows Store App

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.

Write the following code in the default.html:

<!DOCTYPE html>

<html>

<head>

</head>

</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>

</head>

<body>

<div>

Shuffle Letter

</button>

Add letter

</button>

</div>

</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:

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.