Datalist Edit button created in ITemplate class

[Charles]

Hello,

I have found lots of examples and information on how to create an edit
button in the datalist control, however the edit button is done with the edit
template property.

I have created the edit button in a class that Implements ITemplate in the
InstantiateIn Sub. The information of the row that the edit button is
clicked on will be displayed in textboxes (outside of the datalist control)
after postback for editing. Below is some partial code:

Public Class CWebExpenses
Inherits System.Web.UI.Page

dlstExpenses.ItemTemplate = New ItemTemplateClass

Private Class ItemTemplateClass
Implements ITemplate

Public Sub InstantiateIn(ByVal container As
System.Web.UI.Control) Implements System.Web.UI.ITemplate.InstantiateIn

'code that sets up table and other cells

td = New TableCell
Dim _btnEdit As New Button
_btnEdit.Text = "Edit"
AddHandler _btnEdit.Click, AddressOf Edit_Click
td.Controls.Add(_btnEdit)
tr.Cells.Add(td)
End Sub

Private Sub Edit_Click(ByVal sender As Object, ByVal e As System.EventArgs)
'What should go in here? I have an HtmlInputHidden in each row
'that I would like to grab to fill in the textboxes that are
outside the datalist
'control.
End Sub

End Class
End Class

Thank you for any help that you can give!

Charles

 

[Brock Allen]

If I understand what you're trying to do, you want to have an Edit button
in an ItemTemplate for a DataList, but you don't want the normal Edit behavior
form the DataList. So then your question is what event do you handle? I'd
start with letting the DataList manage your promary key by setting the PrimaryKeyField
to be the column name of the PK. Then I'd suggest having your Button in your
ItemTemplate have a CommandName="MyEdit". You'd then want to handle the DataList's
ItemCommand event:

private void _list_ItemCommand(object source, System.Web.UI.WebControls.DataListCommandEventArgs
e)
{
if (e.CommandName == "MyEdit")
{
object pk = _list.DataKeys[e.Item.ItemIndex];
// now use pk to show info elsewhere
}
}

So if the ItemCommand is your button, e.Item is the row in the DataList for
your button. Grab the PK form the DataList and then you have all the info
you need for that row. I hope this is what you were looking for.

 

[Charles]

Thanks! That is what I was looking for! I was working on what came with the
DataList control while I was waiting for a reply and thought that would work
too. Now I am wondering which way I want to go, with what the DataList
control gives me or what I have described.

Thanks again,
Charles

If I understand what you're trying to do, you want to have an Edit button
in an ItemTemplate for a DataList, but you don't want the normal Edit behavior
form the DataList. So then your question is what event do you handle? I'd
start with letting the DataList manage your promary key by setting the PrimaryKeyField
to be the column name of the PK. Then I'd suggest having your Button in your
ItemTemplate have a CommandName="MyEdit". You'd then want to handle the DataList's
ItemCommand event:

private void _list_ItemCommand(object source, System.Web.UI.WebControls.DataListCommandEventArgs
e)
{
if (e.CommandName == "MyEdit")
{
object pk = _list.DataKeys[e.Item.ItemIndex];
// now use pk to show info elsewhere
}
}

So if the ItemCommand is your button, e.Item is the row in the DataList for
your button. Grab the PK form the DataList and then you have all the info
you need for that row. I hope this is what you were looking for.

Hello,

I have found lots of examples and information on how to create an edit
button in the datalist control, however the edit button is done with
the edit template property.

I have created the edit button in a class that Implements ITemplate in
the InstantiateIn Sub. The information of the row that the edit
button is clicked on will be displayed in textboxes (outside of the
datalist control) after postback for editing. Below is some partial
code:

Public Class CWebExpenses
Inherits System.Web.UI.Page
dlstExpenses.ItemTemplate = New ItemTemplateClass

Private Class ItemTemplateClass
Implements ITemplate
Public Sub InstantiateIn(ByVal container As
System.Web.UI.Control) Implements
System.Web.UI.ITemplate.InstantiateIn

'code that sets up table and other cells

td = New TableCell
Dim _btnEdit As New Button
_btnEdit.Text = "Edit"
AddHandler _btnEdit.Click, AddressOf Edit_Click
td.Controls.Add(_btnEdit)
tr.Cells.Add(td)
End Sub
Private Sub Edit_Click(ByVal sender As Object, ByVal e As
System.EventArgs)
'What should go in here? I have an HtmlInputHidden in each
row
'that I would like to grab to fill in the textboxes that are
outside the datalist
'control.
End Sub
End Class
End Class
Thank you for any help that you can give!

Charles