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Thread: Checkbox CheckChanged Problem

  1. #1

    Thread Starter
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    Question Checkbox CheckChanged Problem

    Hello Everyone,

    I am a newbie to VB and I am trying to Insert/Delete records in a MSSQL database based on if a checkbox is checked or unchecked. The checkbox is an item template in a datagrid, I can check/uncheck the checkbox but it doesn't do an insert or delete. Here is my code:

    ASPX Page:
    HTML Code:
    <asp:TemplateColumn><ItemTemplate><asp:CheckBox runat="server" ID="chkMap" OnCheckedChanged="chkmap_CheckChanged" AutoPostBack="true"></asp:CheckBox></ItemTemplate></asp:TemplateColumn>
    .VB Page:
    Code:
    Private Sub chkmap_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs)
    Dim Data As New Stored.BusinessLogicLayer.CInput.DataInput
    Dim Deletion As New Stored.BusinessLogicLayer.CInput.DataRemoval
    
    Dim ceId As Integer = CInt(Session("ceid"))
    Dim userId As Integer = CInt(Session("userid"))
    Dim manchestStore As Integer = CInt(Session("mancheststore"))
    
    Dim compId As Integer
    Dim uComp As Integer
    Dim assignCount As Integer = 0
    
    Dim i As Integer
    For i = 0 To dgCStores.Items.Count - 1
    If CType(dgCStores.Items(i).Cells(0).FindControl("chkMap"), CheckBox).Checked = True Then
    compId = CInt(dgCStores.Items(i).Cells(1).Text)
    uComp = CInt(dgCStores.Items(i).Cells(3).Text)
    
    
    Data.InputUserMap(userId, ceId, uComp, manchestStore)
    assignCount += 1
    ElseIf CType(dgCStores.Items(i).Cells(0).FindControl("chkMap"), CheckBox).Checked = False Then
    compId = CInt(dgCStores.Items(i).Cells(1).Text)
    uComp = CInt(dgCStores.Items(i).Cells(3).Text)
    Deletion.DeleteUserMapping(userId, ceId, uComp, manchestStore)
    End If
    Next
    
    End Sub
    I even tried to erasing all the code & doing something along these lines in the code behind:
    Code:
    Private Sub chkmap_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs)
    Dim Data As New Stored.BusinessLogicLayer.CInput.DataInput
    Dim Deletion As New Stored.BusinessLogicLayer.CInput.DataRemoval
    
    Dim ceId As Integer = CInt(Session("ceid"))
    Dim userId As Integer = CInt(Session("userid"))
    Dim manchestStore As Integer = CInt(Session("mancheststore"))
    
    Dim compId As Integer
    Dim uComp As Integer
    
    If chkmap.Checked = True Then 
    Data.InputUserMap(userId, ceId, uComp, manchestStore)
    Else
    Deletion.DeleteUserMapping(userId, ceId, uComp, manchestStore)
    But then I get the error that the control chkmap has not been declared. I am confused as to how this needs to be declared, do I set a variable to the FindControl("chkmap") and then set it as variable.checked = true ?

    Hope you guys can help me out
    Thanks

  2. #2
    Learning .Net danasegarane's Avatar
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    Re: Checkbox CheckChanged Problem

    Did you debug the code. Does it run inside the checked changed event. I doubt it wont. As you said the checkbox is inside the datagrid, you may handle the Itemcommand event of the datagrid..
    Please mark you thread resolved using the Thread Tools as shown



    www.techreceipe.tk


  3. #3
    ASP.NET Moderator gep13's Avatar
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    Posts
    21,962

    Re: Checkbox CheckChanged Problem

    Are you expecting that clicking the CheckBox will result in an immediate PostBack to the server?

    As per the documentation here:

    http://msdn.microsoft.com/en-us/libr...opostback.aspx

    The AutoPostBack property is false, meaning that you would need a button, or some other control, to initiate the PostBack, at which point the CheckedChanged event of the CheckBox would occur.

    You can change the AutoPostBack property if that is what you want.

    Gary

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