I am working on a ASP.NET 4 assignment but am stuck on nuber 6 how do I do a cll

ID: 3681973 • Letter: I

Question

I am working on a ASP.NET 4 assignment but am stuck on nuber 6 how do I do a cllback to check server status. Have seen examples of call back for database and to have the server do something. but question six has me stumped. I had posted this before but forgot to say I was using VB not C#.

1.) Modify your page from week 1 (the one with the codebehind code) to add all relevant attributes for your item. Include at least 5 attributes and at least 2 data types (example: a coin's item name is a string and its weight is a floating point number).

2.) Delete the page that uses inline code since the project architect insists that all pages use only codebehind code. 3.)Create a "Home.aspx" page that displays a welcome message for your application.

4.)Change the project's settings to display the "Home" page when the project runs instead of the "Insert" page.

5.) Add a "Cancel" button that will redirect to "Home.aspx" when clicked.

6.) Add a button to "Home.aspx" called "Check System Status." When clicked, this button will initiate a client callback to the server. The server-side method will return a string indicating that the server is online. Display this response as a JavaScript popup. Do not use a full page postback. Use a client callback. ( I am using VB.NET)

HTML --- file Home.aspx

<%@ Page Language="vb" AutoEventWireup="false" CodeBehind="Home.aspx.vb" Inherits="JimHawthorneMusic.WebForm2" %>
<script src="JavaScript.js" type="text/javascript"></script>
<!DOCTYPE html>

</section>
</div>
</form>
</body>
</html>

VB -- file Home.aspx.vb

Public Class WebForm2
Inherits System.Web.UI.Page
Partial Class CallBack_DB_aspx
Inherits System.Web.UI.Page
Implements System.Web.UI.ICallbackEventHandler

Public Sub RaiseCallbackEvent(eventArgument As String) Implements ICallbackEventHandler.RaiseCallbackEvent
Throw New NotImplementedException()
End Sub

Public Function GetCallbackResult() As String Implements ICallbackEventHandler.GetCallbackResult
Throw New NotImplementedException()
End Function
End Class

Protected Sub btnMusic_Click(sender As Object, e As EventArgs) Handles btnMusic.Click
Response.Redirect("Music.aspx")
End Sub

Protected Sub btnCheckSysStat_Click(sender As Object, e As EventArgs) Handles btnCheckSysStat.Click

End Sub
End Class

Explanation / Answer

Under Home.aspx:

<%@ Page Language="vb" AutoEventWireup="false" CodeBehind="Home.aspx.vb" Inherits="JimHawthorneMusic.Home" %>
<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>Jim's Music Home</title>
    <link href="StyleSheet1.css" rel="stylesheet" type="text/css" />
    <script src="JavaScript.js"></script>
</head>
<body>
    <form id="form1" runat="server">
        <div id="home">
            <section id="firstsentence">
                <br />
                <h2>Jim's Music Listings</h2>
                <h3>Home Page</h3>
            </section>
            <section id="buffer" class="auto-style1">
            </section>
            <section id="Musicbutton" class="auto-style2">
                <table class="auto-style9">
                    <tr>
                        <td class="auto-style5">
                            <asp:Button ID="btnMusic" runat="server" Text="Music" ForeColor="Black" Height="30px" Width="100%" />
                        </td>
                        <td class="auto-style8"></td>
                        <td class="auto-style4">
                            <%--<asp:Button ID="btnCheckSysStat" runat="server" Text="Check System Status" ForeColor="Black" Height="30px" Width="100%" />--%>
                            <input id="btnCheckSysStat" type="button" value="Check System Status" />

                        </td>
                    </tr>
                </table>

            </section>
        </div>
    </form>
</body>
</html>

================================================================================

Under Home.aspx.vb:

-------------------------------

Partial Public Class Home
    Inherits System.Web.UI.Page
    Implements System.Web.UI.ICallbackEventHandler
    Public FromServer = "Server val"
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        If Page.IsCallback Then
            Return
        End If
        Dim cbReference = Page.ClientScript.GetCallbackEventReference(Me, "arg", "ReceiveServerData", "")
        'Putting the reference in the method that will initiate Callback
        Dim callbackScript = "function CallServer(arg, context) {" + cbReference + "; }"

'Registering the method
Me.ClientScript.RegisterClientScriptBlock(Me.GetType(), "CallServer", callbackScript, True)

    End Sub
    Protected Sub btnMusic_Click(sender As Object, e As EventArgs) Handles btnMusic.Click
        Response.Redirect("Music.aspx")
    End Sub

'Protected Sub btnCheckSysStat_Click(sender As Object, e As EventArgs) Handles btnCheckSysStat.Click

    'End Sub
    Public Sub RaiseCallbackEvent(eventArgument As String) Implements ICallbackEventHandler.RaiseCallbackEvent
        FromServer = "server is online"
    End Sub

    Public Function GetCallbackResult() As String Implements ICallbackEventHandler.GetCallbackResult
        Return FromServer
    End Function
End Class

===========================================================================

Under javaScript.js

---------------

function InitiateCallBack() {
CallServer('', '');
}

// Called after the server side processing is done
function CallServer(arg, context) {
    alert('Calling server');
}
function ReceiveServerData(arg, context) {
    //arg: hold the result
    alert(arg);
}

================================

under Music.aspx:

----------------------------

<%@ Page Language="vb" AutoEventWireup="false" CodeBehind="Music.aspx.vb" Inherits="JimHawthorneMusic.Music" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    Welcome Misic Page
        <br />
        <asp:Button ID="btnCancle" runat="server" Text="Cancle" />
    </div>
    </form>
</body>
</html>

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