Sending Data to Server in Windows Store


In this article I describe how to create Windows Store Apps for sending data to a server using JavaScript. You can send data to the "server". Sending data is often done with the Data-writer object; it will write to the socket stream.

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>



    <meta charset="utf-8" />


    <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>


<body role="application" style="background-color: lightgoldenrodyellow">

    <center><div id="rootGrid">

        <div id="content">

            <h1 id="featureLabel"></h1>

            <div id="contentHost"></div>






Write the following code in the default.js:

(function () {

    "use strict";

    var appTitle = "DatagramSocket";

    var pagess = [

        { url: "page.html", title: "Close Socket" }


    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();


        eventObject.detail.setPromise(WinJS.UI.Pages.render(url, host, eventObject.detail.state).then(function () {

            WinJS.Application.sessionState.lastUrl = url;



    WinJS.Namespace.define("App", {

        appTitle: appTitle,

        pages: pages


    WinJS.Application.addEventListener("activated", activated, false);



Write the following code in the page.html:

<!DOCTYPE html>

<html xmlns="">


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



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


            <button id="buttonSend">Send 'hello'</button>



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

        <p id="statusBox"></p>

        <p id="outputBox"></p>




Write the following code in the script.js:

(function () {

    "use strict";

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

        ready: function (element, options) {

            document.getElementById("buttonSend").addEventListener("click", sendHello, false);



    function sendHello() {

        if (!socketsapp.connected) {

            socketsapp.displayStatus("Client: you must connect the client before using it.");



        if (!socketsapp.clientDataWriter) {

            socketsapp.clientDataWriter = new Windows.Storage.Streams.DataWriter(socketsapp.clientSocket.outputStream);


        var string = "Hello World";



        socketsapp.displayStatus("Client sending: " + string + ".");

        socketsapp.clientDataWriter.storeAsync().done(function () {

            socketsapp.displayStatus("Client sent: " + string + ".");

        }, onError);


    function onError(reason) {

        if (!socketsapp.closing) {








In this article I described how to create a Windows Store App for sending data to the server 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.