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Grid view with Ajax button extender, return row clicked

Posted on 2011-09-20
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Last Modified: 2012-05-12
Hi Experts

I have a grid view control with an ajax toolkit confirm button extender, the code works fine but I want to store the selected row number from the data grid. As soon as the ajax confirm button appears the e value is set to the ajax control. Any ideas?
<asp:TemplateField HeaderText="Delete"  InsertVisible="False" Visible="False">
                         <HeaderStyle BackColor="#1973BB" ForeColor="White" HorizontalAlign="Center" />   
                        <ItemTemplate>
                           <asp:ImageButton ID="BookDelete" runat="server"
                                CausesValidation="False" 
                                ImageUrl="~/Images/icon-delete.jpg" OnClick="Button1_Click" />

                           <ajaxToolkit:ConfirmButtonExtender ID="ConfirmBookDelete" 
                    runat="server" TargetControlID="BookDelete"
                    ConfirmText="test"/>
                      </ItemTemplate>

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Question by:MrDavidThorn
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9 Comments
 
LVL 9

Expert Comment

by:BlueYonder
ID: 36567238
To get a value from the row use the a hiddenfield
<asp:HiddenField runat="server" ID="hfId" Value='<%# Bind("Id") %>' />

to retrieve the value in code behind call hfId.value
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Expert Comment

by:BlueYonder
ID: 36567251
The row number can be obtained from e.Row.RowIndex.  The eventargs is GridViewRowEventArgs
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Author Comment

by:MrDavidThorn
ID: 36567333
sorry I dont quite understand, I have the Button1_Click routine  which is fired when the button is clicked, the ajax pop appears before the routine is executed if I use the  e value in Button1_Click  it returns the value from the ajax message box
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
        
    End Sub

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LVL 9

Expert Comment

by:BlueYonder
ID: 36567365
Protected Sub Button1_Click (ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs)
Button1.Click
        e.Row.RowIndex;//this is the row number
    End Sub
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Expert Comment

by:BlueYonder
ID: 36567372
The event argument used is System.Web.UI.WebControls.GridViewRowEventArgs which contains the row number.  If you use just System.EventArgs, it will not contain the row number.
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Author Comment

by:MrDavidThorn
ID: 36567415
I get the error message

Method 'Protected Sub Button1_Click (sender As Object, e As System.Web.UI.WebControls.GridViewRowEventArgs)' does not have a signature compatible with delegate 'Delegate Sub ImageClickEventHandler(sender As Object, e As System.Web.UI.ImageClickEventArgs)'.      

your code would work fine if I eant using the Ajax confirm button extender
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Accepted Solution

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BlueYonder earned 500 total points
ID: 36567444
1. Add this your GridView:

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataKeyNames="id"
            DataSourceID="SqlDataSource1" OnRowCreated="GridView1_RowCreated1" >

  <Columns>
            <asp:TemplateField HeaderText="myRowid">
            <ItemTemplate><asp:Label runat="server" />                    
            </ItemTemplate>          
            </asp:TemplateField>

...

</Columns>

2. Add this to your code page

  Protected Sub GridView1_RowCreated1(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles GridView1.RowCreated
        If e.Row.RowType = DataControlRowType.DataRow Then

            ' Retrieve the Label from the first column.
            Dim myLabel As Label = CType(e.Row.Cells(0).Controls(0), Label)

            ' Set Label text equal to the rowIndex +1
            myLabel.Text = e.Row.RowIndex.ToString() + 1

        End If
    End Sub
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Author Comment

by:MrDavidThorn
ID: 36568154
the above method doesnt work
A) its on the OnRowCreated
B) I get the error message when using e.row.rownumber()

       'System.Web.UI.WebControls.GridViewCommandEventArgs.Friend ReadOnly Property Row As System.Web.UI.WebControls.GridViewRow' is not accessible in this context because it is 'Friend'.      

It works when I use debug mode but when I start the app it complains

Im new to Ajax so im obviously missing a trick!
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Author Comment

by:MrDavidThorn
ID: 36568569
After much searching I found the answer the imagebutton needs the select command name
     <asp:ImageButton ID="BookDelete" runat="server"
                                CausesValidation="False" CommandName="Select"
                                ImageUrl="~/Images/icon-delete.jpg" />


and then in my vb.net code Iv used
    Response.Write(gvBookNumber.Rows(gvBookNumber.SelectedIndex).Cells.Item(0).Text)

Many thanks!
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