Question

Setting Datagrid Editable Fields in Code

Asked by: JimWarner

Hi All,

I'm using a datagrid with a bound dataview to display and edit a database.  That works fine.

What I'd like to do is be able to set some default values into the editable text boxes that appear on the appropriate row when the datagrid_EditCommand fires.  Simple things like having a date field default to Now() or pre-filling a field with a string value held in session.  I don't want them to change the database, or even the dataset actually until the datagrid_UpdateCommand fires.  Essentially, I just want to replicate manually typing into the boxes except in code.

The problem is that I can't find a way to reference the text boxes.  Using a structure like e.Item.Cells(6).Controls(0) as I do to read data tells me it is read-only.  How do I write to those cells?

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Asked On
2007-09-25 at 13:39:09ID22852186
Tags

datagrid

,

editable

,

code

Topics

Programming for ASP.NET

,

Microsoft Visual Basic.Net

Participating Experts
1
Points
250
Comments
6

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Answers

 

by: digitalZoPosted on 2007-09-26 at 02:47:05ID: 19961653

Dim row As GridViewRow = GridView1.Rows(e.RowIndex)
Dim txt1 As TextBox = row.FindControl("txt1")

 

by: JimWarnerPosted on 2007-09-26 at 05:30:52ID: 19962413

<Dim row As GridViewRow = GridView1.Rows(e.RowIndex)
<Dim txt1 As TextBox = row.FindControl("txt1")

Give me GirdViewRow is not defined.  That's a .NET 3.0 control, but I'm limited to .NET 1.1 and can't upgrade.

 

by: digitalZoPosted on 2007-09-26 at 22:03:13ID: 19968924

Try this:
Private Sub datagrid_UpdateCommand(ByVal source As Object, ByVal e As System.Web.UI.WebControls.DataGridCommandEventArgs)

  Dim txt1 As String = CType(e.Item.Cells(1).Controls(0),TextBox).Text
  Dim txt2 As String = CType(e.Item.Cells(2).Controls(0),TextBox).Text

End Sub

 

by: JimWarnerPosted on 2007-09-27 at 06:17:58ID: 19970841

Thanks for the help, digitalZo.

<  Dim txt1 As String = CType(e.Item.Cells(1).Controls(0),TextBox).Text> structure lets me READ a cell's contents, and I'm already using it to write datagrid changes to the database.  I'm wanting to pre-fill text into some of those boxes when the datagrid1_EditCommand fires.  

 

by: digitalZoPosted on 2007-09-28 at 03:29:07ID: 19977553

Sorry, misread your question. For pre-filling text, you will have to make use of EditItemTemplate.

To given an example in the Source Code of the app:

<asp:TemplateColumn HeaderText="FieldName1">
 
<ItemTemplate>
<asp:Label ID="lblField1" runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "FieldName1") %>' />
</ItemTemplate>
 
<EditItemTemplate>
<asp:TextBox runat="server" id="txtField1" Text='[text you want to enter]'/>
</EditItemTemplate>
 
</asp:TemplateColumn>
</Columns>

 

by: JimWarnerPosted on 2007-09-28 at 13:06:38ID: 19981413

Thanks digitalZo.  EditItemTemplate led me in the right direction.  

20120131-EE-VQP-002

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