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Gridview drop down list

Posted on 2008-06-19
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Last Modified: 2008-06-30
I have a gridview displaying information from an access database. One field will be updateable. I want that field to be a dropdown list that displays data from a reference table. How can I get the gridview to show it's data along with the drop down list for that one feild? And once a user selects a different value from that drop down list, I want tthe update to the database to happen when the user makes the selection. Is there anyway to do this? Any help would be appreciated.
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Question by:trav1514
2 Comments
 
LVL 16

Accepted Solution

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MikeMCSD earned 500 total points
ID: 21826048
<asp:GridView ID="grid1" . .
  OnRowDataBound="grid1_RowDataBound"  ...  >

<Columns>
<asp:TemplateField HeaderText="Move To">
<ItemTemplate>
<asp:DropDownList ID="ddlMoveTo" Width="98px" runat="server" OnSelectedIndexChanged="ddlMoveTo_SelectedIndexChanged" AutoPostBack="true"></asp:DropDownList>
</ItemTemplate>
</asp:TemplateField>


  protected void ddlMoveTo_SelectedIndexChanged(object sender, EventArgs e)
  {
    string giftID = string.Empty;
    string eventID = string.Empty;

    DropDownList ddl = (DropDownList)sender;
    GridViewRow row2 = (GridViewRow)ddl.NamingContainer;
    giftID = ((Label)row2.FindControl("lblGiftID")).Text;  // grids index value
    eventID = ddl.SelectedValue;    // value of selected item in drop down
    ............


To load the drop down:

  protected void grid1_RowDataBound(object sender, GridViewRowEventArgs e)
  {
   
    if (e.Row.RowType == DataControlRowType.DataRow)
    {

      DropDownList ddlMoveTo = (DropDownList)e.Row.FindControl("ddlMoveTo");
      ddlMoveTo.DataSource = Session["table"]; // or from database
      ddlMoveTo.DataTextField = "EventName";
      ddlMoveTo.DataValueField = "EventID";
      ddlMoveTo.DataBind();
      ddlMoveTo.Items.Insert(0, new ListItem("Select an item:", "0"));
      ........




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Author Comment

by:trav1514
ID: 21879379
I apologize for posting this question and not answering your response for so ,long. I got sidetraked by other things here at work. I finally got a chance to try this. I am still new to ASP.net and C#, so I'm not sure I followed completely. I've got this almost up, but of course my drop down list is not working. How ndo I connect to the db for it? I've posted my page code. Thanks for the help.

Page:
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="TestPage2.aspx.cs" Inherits="TestPage2" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Drop Down List Test</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>

        <asp:GridView ID="grid1" runat="server" AutoGenerateColumns="False" DataKeyNames="ID" DataSourceID="AccessDataSource1" EmptyDataText="There are no data records to display." OnRowDataBound="grid1_RowDataBound">
            <Columns>
                <asp:BoundField DataField="LName" HeaderText="LName" SortExpression="LName" />
                <asp:BoundField DataField="FName" HeaderText="FName" SortExpression="FName" />
                <asp:TemplateField HeaderText="Position">
                <ItemTemplate>
                    <asp:DropDownList ID="ddlPos" Width="98px" runat="server" OnSelectedIndexChanged="ddlPos_SelectedIndexChanged" AutoPostBack="true"></asp:DropDownList>
                </ItemTemplate>
                </asp:TemplateField>
            </Columns>
        </asp:GridView>
        <asp:AccessDataSource ID="AccessDataSource1" runat="server" DataFile="App_Data\BaseballXP_Working.mdb"
            SelectCommand="SELECT ID, LName, FName, PosNo FROM CurrentBatterStats"
            UpdateCommand="UPDATE CurrentBatterStats SET LName = ?, FName = ?, PosNo = ? WHERE ID = ?">
            <UpdateParameters>
                <asp:Parameter Name="LName" Type="String" />
                <asp:Parameter Name="FName" Type="String" />
                <asp:Parameter Name="PosNo" Type="Double" />
            </UpdateParameters>
        </asp:AccessDataSource>
        &nbsp;
        <asp:AccessDataSource ID="AccessDataSource2" runat="server" DataFile="App_Data\BaseballXP_Working.mdb"
            SelectCommand="SELECT `ID`, `Position`, `Description` FROM `Positions`" >
            <DeleteParameters>
                <asp:Parameter Name="ID" Type="Int32" />
            </DeleteParameters>
            <InsertParameters>
                <asp:Parameter Name="ID" Type="Int32" />
                <asp:Parameter Name="Position" Type="String" />
                <asp:Parameter Name="Description" Type="String" />
            </InsertParameters>
            <UpdateParameters>
                <asp:Parameter Name="Position" Type="String" />
                <asp:Parameter Name="Description" Type="String" />
                <asp:Parameter Name="ID" Type="Int32" />
            </UpdateParameters>
        </asp:AccessDataSource>
    </div>
    </form>
</body>
</html>

Code Behind:
    protected void ddlPos_SelectedIndexChanged(object sender, EventArgs e)
    {
        string giftID = string.Empty;
        string eventID = string.Empty;

        DropDownList ddl = (DropDownList)sender;
        GridViewRow row2 = (GridViewRow)ddl.NamingContainer;
        giftID = ((Label)row2.FindControl("ID")).Text;  // grids index value
        eventID = ddl.SelectedValue;    // value of selected item in drop down
    }

    protected void grid1_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            DropDownList ddlPos = (DropDownList)e.Row.FindControl("ddlPos");
            ddlPos.DataSource = Session["Positions"]; // or from database
            ddlPos.DataTextField = "Position";
            ddlPos.DataValueField = "PosID";
            ddlPos.DataBind();
            ddlPos.Items.Insert(0, new ListItem("Select an item:", "0"));
        }
    }
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