Solved

Button click doesn't update number

Posted on 2009-05-05
2
289 Views
Last Modified: 2013-11-27
Hi guys,

I have the following code for my item.aspx page. User clicks on the Add to Shopping Cart button. Record gets inserted in shopping cart table. The shopping cart link is supposed to change to Shopping Cart (Number_of_items_in_cart_here). But it doesn't change unless I go to another page after clicking the button or refresh page. How do I make that change after the first click? Inserting in the table works fine. I added master page code that actually checks for number of items in shopping cart table. Basically, itemsInCart var doesn't get updated after the button was clicked. It updates only after I navigate to some other page or refresh item.aspx. I guess there is a problem with my master page. Please help.

Thanks.

item.aspx:
 

    Protected Sub ImageButton1_Click(ByVal sender As Object, ByVal e As System.Web.UI.ImageClickEventArgs) Handles ImageButton1.Click

        Dim strConn As String = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=|DataDirectory|\titanmusic.accdb;Persist Security Info=True"

        Dim objConnection As New System.Data.OleDb.OleDbConnection(strConn)

        Dim strSQL As String = "INSERT INTO Cart (SessionID, ProductFK1) VALUES ('" & Session.SessionID & _

                                     "', " & DetailsView1.DataKey.Value & ")"

        Dim objCommand As New System.Data.OleDb.OleDbCommand(strSQL, objConnection)
 

        Try

            objConnection.Open()

            Try

                objCommand.ExecuteNonQuery()

            Catch ex As Exception

                MsgBox(Err.Number & " " & Err.Description)

            Finally

                objConnection.Close()

            End Try

        Catch ex As Exception

            MsgBox(Err.Number & " " & Err.Description)

        End Try
 

    End Sub
 

Master Page:
 

Public itemsInCart As Integer
 

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

        Session("SCart") = "CartSession"

        Dim ctl As Control

        Dim strConn As String = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=|DataDirectory|\titanmusic.accdb;Persist Security Info=True"

        Dim objConnection As New System.Data.OleDb.OleDbConnection(strConn)

        Dim strSQL As String = "SELECT COUNT(*) FROM Cart WHERE SessionID='" & Session.SessionID & "'"

        Dim objCommand As New System.Data.OleDb.OleDbCommand(strSQL, objConnection)
 

        Try

            objConnection.Open()
 

            itemsInCart = objCommand.ExecuteScalar
 

            objConnection.Close()

        Catch ex As Exception

            MsgBox("Connection failed to open. Error: " & ex.ToString())

        End Try
 

    End Sub
 

                                    <% 

                                        If itemsInCart = 0 Then

                                            Response.Write("Shopping Cart")

                                        Else

                                            Response.Write("Shopping Cart (" & itemsInCart & ")")

                                        End If

                                    %>

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Question by:RealSnaD
2 Comments
 
LVL 10

Accepted Solution

by:
JPJ78 earned 500 total points
ID: 24302810
The click event is handled after Page_Load, therefore has the new item not been inserted when you count the items in your masterpage.
Move the counting to PreRender.



    Protected Sub Page_PreRender(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.PreRender

        Session("SCart") = "CartSession"

        Dim ctl As Control

        Dim strConn As String = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=|DataDirectory|\titanmusic.accdb;Persist Security Info=True"

        Dim objConnection As New System.Data.OleDb.OleDbConnection(strConn)

        Dim strSQL As String = "SELECT COUNT(*) FROM Cart WHERE SessionID='" & Session.SessionID & "'"

        Dim objCommand As New System.Data.OleDb.OleDbCommand(strSQL, objConnection)

 

        Try

            objConnection.Open()

 

            itemsInCart = objCommand.ExecuteScalar

 

            objConnection.Close()

        Catch ex As Exception

            MsgBox("Connection failed to open. Error: " & ex.ToString())

        End Try

 

    End Sub

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Author Comment

by:RealSnaD
ID: 24304142
That worked beautifully, thank you!
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