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.