CODEWITHSUNDEEP
c#asp.netgridviewselectedselectedindexchanged
Hani Honey
Hani Honey

Reputation: 2131

Selected row GridView won't extract data

I have a GridView which I am filling with data from my database. The data displays perfectly. My problem is that I want to be able to click on a row and then display the information that is in that row elsewhere (eventually I'll have a splitscreen to format the selected data nicely). The selection works, because it highlights the current row. However, I cannot figure out how to display that data elsewhere. For now, I'm trying to display the content of a single cell in a label called testLabel. I've tried many different methods, and the testLabel never updates when I click a new row. Can anybody see what is going wrong here?

C#

protected void DefaultGrid_SelectedIndexChanged(Object sender, EventArgs e)
{
    GridViewRow row = DefaultGrid.SelectedRow;
    testLabel.Text = row.Cells[2].Text;
}

ASPX

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <asp:ScriptManager ID = "ScriptManager" runat="server" />
    <div>
        <div>
            <asp:Label runat="server" id = "orderByLabel" Text = "Order By: " />


            <asp:DropDownList runat="server" ID="orderByList" AutoPostBack="true">
                <asp:ListItem Value="fName" Selected="True">First Name</asp:ListItem>
                <asp:ListItem Value="lName">Last Name</asp:ListItem>
                <asp:ListItem Value="state">State</asp:ListItem>
                <asp:ListItem Value="zip">Zip Code</asp:ListItem>
                <asp:ListItem Value="cwaSource">Source</asp:ListItem>
                <asp:ListItem Value="cwaJoined">Date Joined</asp:ListItem>
            </asp:DropDownList>
        </div>
        <div>
            <asp:Label runat="server" ID="searchLabel" Text="Search For: " />
            <asp:TextBox ID="searchTextBox" runat="server" Columns="30" />
            <asp:Button ID="searchButton" runat="server" Text="Search" />
        </div>
    <div align="center">
    <asp:UpdatePanel ID = "up" runat="server">
    <Triggers>
        <asp:AsyncPostBackTrigger ControlID = "orderByList"
        EventName="SelectedIndexChanged" />
         <asp:AsyncPostBackTrigger ControlId="searchButton" EventName="Click" />
    </Triggers>

    <ContentTemplate>
        <asp:GridView ID="DefaultGrid" runat = "server" DataKeyNames = "fName"
        onselectedindexchanged = "DefaultGrid_SelectedIndexChanged"
        autogenerateselectbutton = "true"
        selectedindex="0">
        <SelectedRowStyle BackColor="Azure"
        forecolor="Black"
        font-bold="true" />
        <Columns>
            <asp:ButtonField CommandName="Select" Visible="false" />
        </Columns>
        </asp:GridView>
        </ContentTemplate>
        </asp:UpdatePanel>



    </div>
    </div>
    <div>
        <asp:Label runat="server" ID="testLabel" Text="test" />
    </div>
    </form>
</body>
</html>

Upvotes: 0

Views: 1892

Answers (4)

Bolu
Bolu

Reputation: 8786

I doubt your DefaultGrid_SelectedIndexChanged ever get called. Check this: http://forums.asp.net/t/1448445.aspx

Quote:

you need a buttonfield or a postback control such as a button, linkbutton,imagebutton with the commandName="Select" for the selectedIndexChanged event handler to trigger.

Upvotes: 0

Tomas Voracek
Tomas Voracek

Reputation: 5914

You have provided own select button and also set property http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.gridview.autogenerateselectbutton.aspx to true. You must choose only one of those.

Edit: Ah, see it now. Label 'testLabel' is outside updatepanel. Move it to ContentTemplate.

Upvotes: 1

Adriano Carneiro
Adriano Carneiro

Reputation: 58615

By the looks of it, it should be working. Here are a few pointers:

  • When accessing row.Cells[2].Text, keep in mind the index is Zero based (first cell is indexed 0).
  • You have a fixed column that is invisible. Although not showing, that column should count in your column indexing numbers.
  • Place a breakpoint inside DefaultGrid_SelectedIndexChanged. When it gets there, fool around with the possibilities by watching variables and calling methods. That should help you a lot.

Upvotes: 0

Saul Delgado
Saul Delgado

Reputation: 167

Have you tried placing testLabel inside another UpdatePanel and force an update on it after you change the label's text?

Upvotes: 0

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