IT:AD:SignalR:HowTo:Create a JS Client [Notes]

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# IT:AD:SignalR:HowTo:Create a JS Client #



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<panel title="Summary">



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## Process ##

A bare bones implementation of the JS required to create a pub/sub SignalR client would be:

<sxh csharp>

    <callout icon="true" type="class="container">
        <input type="text" id="message" />
        <input type="button" id="sendmessage" value="Send" />
        <input type="hidden" id="displayname" />
        <ul id="discussion">
        </ul">
    </callout>
    <!--Script references. -->
    <!--Reference the jQuery library. -->
    <script src="Scripts/jquery-1.8.2.min.js" ></script>
    <!--Reference the SignalR library. -->
    <script src="Scripts/jquery.signalR-2.0.0.min.js"></script>
    <!--Reference the autogenerated SignalR hub script. -->
    <script src="/signalr/hubs"></script>
    <!--Add script to update the page and send messages.--> 
    <script type="text/javascript">
        $(function () {
            // Declare a proxy to reference the hub
            //which is defined by the attribute -- or if ommitted
            //is the camelcase of the hub classname:
            var chat = $.connection.myChatHub;
            // Create a function that the hub can call to broadcast messages.
            chat.client.broadcastMessage = function (name, message) {
                // Html encode display name and message. 
                var encodedName = $('<div />').text(name).html();
                var encodedMsg = $('<div />').text(message).html();
                // Add the message to the page. 
                $('#discussion').append('<li><strong>' + encodedName
                    + '</strong>:&nbsp;&nbsp;' + encodedMsg + '</li>');
            };
            // Get the user name and store it to prepend to messages.
            $('#displayname').val(prompt('Enter your name:', ''));
            // Set initial focus to message input box.  
            $('#message').focus();
            // Start the connection.
            $.connection.hub.start().done(function () {
                $('#sendmessage').click(function () {
                    // Call the Send method on the hub. 
                    chat.server.send($('#displayname').val(), $('#message').val());
                    // Clear text box and reset focus for next comment. 
                    $('#message').val('').focus();
                });
            });
        });
    </script>

</sxh>


A little more succinct is this example:

<sxh javascript>
<script type="text/javascript" src="~/Scripts/jquery.signalR-0.5.2.js"></script>
    <script type="text/javascript" src="SignalR/Hubs"></script>
    <script type="text/javascript">
        $(document).ready(function () {
            var chat = $.connection.chatHub;
            chat.writeMessage = function (msg) {
                $("#messages").append("<li>" + msg + "</li>");
            }

            $("#buttonSubmit").click(function () {
                chat.broadcastMessage($("#txtInput").val());
            });

            $.connection.hub.start();
        });
    </script>
</sxh>

>You'll have to update the paths to the JQuery libs that are current in your app.