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GridView cell textbox.Visible = true

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GridView cell textbox.Visible = true

 
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  #1
Dec 12th, 2007
Hi all, I have a gridview in my project.

There is a cell that contains a dropdownlist, textbox and button.
My task is when the use clicks "others" in the dropdownlist, the textbox and button should show so that they can add new value into the dropdownlist.

But I got an exception.
"Object reference not set to an instance of an object. " at tbxName.Visible = true

How can I show that?
Please help.

ASP.NET Syntax (Toggle Plain Text) 
  1. protected void ddlName_SelectedIndexChanged(object sender, EventArgs e)
  2.     {
  3.         DropDownList dropDown = sender as DropDownList;
  4.         int selectedIndex = dropDown.SelectedIndex;
  5.         GridViewRow gvr = dropDown.NamingContainer as GridViewRow;
  6.  
  7.        // GridViewRow gvr = (GridViewRow)gv_retrieve.Rows[index];
  8.  
  9.         DropDownList ddl = gvr.FindControl("ddlName") as DropDownList;
  10.         if (ddl.SelectedValue == "others")
  11.         {
  12.             TextBox tbxName = (TextBox)gv_retrieve.FindControl("tbxName") as TextBox;            
  13.             tbxName.Visible = true;
  14.         }
  15.     }
Serene Joey
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Re: GridView cell textbox.Visible = true

 
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  #2
Dec 12th, 2007
Sorry sorry~~ I managed to do it already! it's my careless mistake. but then,
now the problem is i have to click twice at my button then the value in the textbox will be added.

is it i have to add something in page_load()?

below is my code.



ASP.NET Syntax (Toggle Plain Text) 
  1. protected void ddlName_SelectedIndexChanged(object sender, EventArgs e)
  2.     {
  3.         DropDownList dropDown = sender as DropDownList;
  4.         int selectedIndex = dropDown.SelectedIndex;
  5.         GridViewRow gvr = dropDown.NamingContainer as GridViewRow;
  6.  
  7.         DropDownList ddl = gvr.FindControl("ddlName") as DropDownList;
  8.         if (ddl.SelectedValue == "others")
  9.         {
  10.             gvr.FindControl("tbxName").Visible = true;
  11.             gvr.FindControl("btnAddName").Visible = true;
  12.         }
  13.         else
  14.         {
  15.             gvr.FindControl("tbxName").Visible = false;
  16.             gvr.FindControl("btnAddName").Visible = false;
  17.         }
  18.     }
  19.  
  20. protected void gv_retrieve_RowCommand(object sender, GridViewCommandEventArgs e)
  21.     {
  22.         //add name
  23.         if (e.CommandName == "addName")
  24.         {
  25.             int index = Convert.ToInt32(e.CommandArgument);           
  26.             GridViewRow gvr = (GridViewRow)gv_retrieve.Rows[index];
  27.  
  28.             if (gvr.RowType == DataControlRowType.DataRow)
  29.             {
  30.                 if (DataControlRowState.Edit > 0 && gvr.RowState > 0)
  31.                 {
  32.                     DropDownList ddl = gvr.FindControl("ddlName") as DropDownList;
  33.                     TextBox tbx = (TextBox)gvr.FindControl("tbxName") as TextBox;
  34.  
  35.                     if (ddl != null)
  36.                     {
  37.                         if (tbx.Text != "")
  38.                         {
  39.                             //check if name exist
  40.                             if (shareDAO.isNameExist(tbx.Text) == false)
  41.                             {
  42.                                 ddl.Items.Add(tbx.Text);
  43.                                 shareDAO.insertName(tbx.Text);
  44.                                 ddl.SelectedValue = tbx.Text;
  45.                                 gvr.FindControl("tbxName").Visible = false;
  46.                                 gvr.FindControl("btnAddName").Visible = false;
  47.                             }
  48.                             else
  49.                             {
  50.                                 Response.Write("<Script language=javascript>alert('Approval Party Name already exist!')</Script>");
  51.                             }
  52.                         }
  53.                     }
  54.  
  55.                 }
  56.             }
  57.         } // end of adding name
  58. }


and this is my aspx.

ASP.NET Syntax (Toggle Plain Text) 
  1. <asp:TemplateField HeaderText="Name">
  2.                         <EditItemTemplate>
  3.                             <asp:DropDownList ID="ddlName" runat="server"
  4.                                 Width="172px" DataSourceID="names" AppendDataBoundItems = "true" DataTextField="names" OnSelectedIndexChanged="ddlName_SelectedIndexChanged" AutoPostBack="True">
  5.                             <asp:ListItem Text = "------------"></asp:ListItem>
  6.                             <asp:ListItem Text = "Others" Value ="others" ></asp:ListItem>
  7.                             </asp:DropDownList><br />
  8.                             <asp:TextBox ID="tbxName" runat="server" Visible = "false" AutoPostBack="True">
  9.                             </asp:TextBox>&nbsp;
  10.                             <asp:Button ID="btnAddName" runat="server" Text="Add" Visible="false" CommandName="addName"  CommandArgument="<%# Container.DataItemIndex %>" />

please help. thanks~
Serene Joey
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