DropDownlist name customized possible ?

[S. Justin Gengo]

Lim,

If you add the drop down list to your page at design time then yes...

The best example of this that I have is adding text boxes at design time.
Here is the code:

First put this code into the designer window. Paste it between the "<form>"
tags:



<asp:DropDownList id="DropDownList1" runat="server" AutoPostBack="True">

<asp:ListItem Value="Please Select The Number of Text Boxes To
Display">Please Select The Number of Text Boxes To Display</asp:ListItem>

<asp:ListItem Value="1">1 Text Box</asp:ListItem>

<asp:ListItem Value="2">2 Text Boxes</asp:ListItem>

<asp:ListItem Value="3">3 Text Boxes</asp:ListItem>

</asp:DropDownList>

<asp:RequiredFieldValidator id="RequiredFieldValidator1" runat="server"
ErrorMessage="3" Font-Names="Webdings" ControlToValidate="DropDownList1"
InitialValue="Please Select The Number of Text Boxes To
Display"></asp:RequiredFieldValidator>

<BR>

<BR>

<asp:Label id="Label1" runat="server"></asp:Label>

<BR>

<BR>

<asp:PlaceHolder id="PlaceHolder1" runat="server"></asp:PlaceHolder>

<BR>

<BR>

<asp:Button id="SubmitButton" runat="server" Text="Submit" Visible="False"

></asp:Button>

Then put this code into the code behind:



Private TextBoxCount, TextBoxLoop As Int32

Protected WithEvents Label1 As System.Web.UI.WebControls.Label

Protected WithEvents SubmitButton As System.Web.UI.WebControls.Button

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MyBase.Load

If IsPostBack Then

TextBoxCount = CType(ViewState("TextBoxCount"), Int32)

For TextBoxLoop = 1 To TextBoxCount

Call LoadTextBox(TextBoxLoop)

Next



ViewState("TextBoxCount") = TextBoxCount

End If

End Sub

Private Sub DropDownList1_SelectedIndexChanged(ByVal sender As
System.Object, ByVal e As System.EventArgs) Handles
DropDownList1.SelectedIndexChanged

Page.Validate()

If Page.IsValid Then

Label1.Text = ""



PlaceHolder1.Controls.Clear()



TextBoxCount = CType(DropDownList1.SelectedValue, Int32)

For TextBoxLoop = 1 To TextBoxCount

Call LoadTextBox(TextBoxLoop)

Next



SubmitButton.Visible = True

ViewState("TextBoxCount") = TextBoxCount

End If

End Sub

Private Sub LoadTextBox(ByVal Id As Int32)

Dim TextBox As New TextBox

TextBox.ID = "TextBox" & Id.ToString

PlaceHolder1.Controls.Add(TextBox)



Dim LiteralControl As New LiteralControl

LiteralControl.Text = "<br><br>"

PlaceHolder1.Controls.Add(LiteralControl)

End Sub

Private Sub SubmitButton_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles SubmitButton.Click

Label1.Text = ""



Dim ControlsCount, ControlsLoop As Int32

Dim ControlType As String

Dim TextBox As TextBox

ControlsCount = PlaceHolder1.Controls.Count - 1

For ControlsLoop = 0 To ControlsCount

'---To be able to see in debugger what is returned

ControlType =
PlaceHolder1.Controls(ControlsLoop).GetType.ToStri ng

If ControlType = "System.Web.UI.WebControls.TextBox" Then

TextBox = CType(PlaceHolder1.Controls(ControlsLoop),
TextBox)

Label1.Text &= TextBox.Text

If (ControlsLoop + 1) < ControlsCount Then

Label1.Text &= " | "

End If

End If

Next

End Sub

Notice where I assign the text boxes their Id? You could assign that from a
database, etc.

Sincerely,

--
S. Justin Gengo, MCP
Web Developer

Free code library at:
[url]www.aboutfortunate.com[/url]

"Out of chaos comes order."
Nietzche


"Lim siew Cheng" <siew_cheng555@yahoo.com> wrote in message
news:3f37bbd0@news.starhub.net.sg...

> Greetings
>
> Does anyone know if it is possible to define the name of a
> dropdownlist
> Eg.,
>
> <asp:DropDownList Runat="server" SelectedIndex=' <%# Convert.ToInt32
> (DataBinder.Eval(Container.DataItem,"Priority"))-1%>' DataSource="<%#
> GetCategories() %>" ID="<%# getName() %> ">
> </asp:DropDownList>
> ?
>
> Error : '<%# getName() %> ' is not a valid identifier.
> Any clues ?
>
> Thanks for any help
>
> REgards
> Lsc
>
>
>

[Alex K]

you put panel on aspx file and onserver side you add control to panel and
you can give any name or value in run time
example:
Dim cbo As System.Web.UI.WebControls.DropDownList

cbo = New System.Web.UI.WebControls.DropDownList()

Panel3.Controls.Add(cbo)

Alex



"Lim siew Cheng" <siew_cheng555@yahoo.com> wrote in message
news:3f37bbd0@news.starhub.net.sg...

> Greetings
>
> Does anyone know if it is possible to define the name of a
> dropdownlist
> Eg.,
>
> <asp:DropDownList Runat="server" SelectedIndex=' <%# Convert.ToInt32
> (DataBinder.Eval(Container.DataItem,"Priority"))-1%>' DataSource="<%#
> GetCategories() %>" ID="<%# getName() %> ">
> </asp:DropDownList>
> ?
>
> Error : '<%# getName() %> ' is not a valid identifier.
> Any clues ?
>
> Thanks for any help
>
> REgards
> Lsc
>
>
>

[Lim Siew Cheng]

Hi there,

Thanks for the swift response.

The scenario I'm facing is rather different as what you had in mind.
I understand it's possible for me to assign IDs IFF I had the
dropdownlist at the codebehind.cs.

However, it is impossible for me , since I cannot forseee how many
records are there in the db

Sorry to skip stating that the existing conditions :
<asp:DropDownList Runat="server" SelectedIndex=' <%# Convert.ToInt32

> (DataBinder.Eval(Container.DataItem,"Priority"))-1%>' DataSource="<%#
> GetCategories() %>" ID="<%# getName() %> ">

^^^^^^^^^^^^^^^^^
Are actually used in a <asp:Datagrid> </asp> block
So in RL, there's going to be DropList_ctr1, DropList_ctrl2 etc. for
EACH ROW of record .
in this case, I'm allowing the user to change the field (thru the
dropdownlist ) and I need to know what RECORD the droplist_1 is for
..........

ID="<% # DataBinder.Eval(Container.DataItem,"TitleID") %>"
Does not work....


Apparently, this has been causing enough distress so someone has done this
See :
[url]http://www.datagridgirl.com/rowselector.aspx[/url]

Alas, I saw the code in action and shrudder to think I have to CODE THAT
much IN ORDER to assign & know the ID for each row! (I'm not lazy, I'm
just horrified to know the amount of work that needs to be done )
I'm still way too templated to literate thru a collection of
ValueObjects :)



Regards
(The still clueless) LSc













S. Justin Gengo wrote:

> Lim,
>
> If you add the drop down list to your page at design time then yes...
>
> The best example of this that I have is adding text boxes at design time.
> Here is the code:
>
> First put this code into the designer window. Paste it between the "<form>"
> tags:
>
>
>
> <asp:DropDownList id="DropDownList1" runat="server" AutoPostBack="True">
>
> <asp:ListItem Value="Please Select The Number of Text Boxes To
> Display">Please Select The Number of Text Boxes To Display</asp:ListItem>
>
> <asp:ListItem Value="1">1 Text Box</asp:ListItem>
>
> <asp:ListItem Value="2">2 Text Boxes</asp:ListItem>
>
> <asp:ListItem Value="3">3 Text Boxes</asp:ListItem>
>
> </asp:DropDownList>
>
> <asp:RequiredFieldValidator id="RequiredFieldValidator1" runat="server"
> ErrorMessage="3" Font-Names="Webdings" ControlToValidate="DropDownList1"
> InitialValue="Please Select The Number of Text Boxes To
> Display"></asp:RequiredFieldValidator>
>
> <BR>
>
> <BR>
>
> <asp:Label id="Label1" runat="server"></asp:Label>
>
> <BR>
>
> <BR>
>
> <asp:PlaceHolder id="PlaceHolder1" runat="server"></asp:PlaceHolder>
>
> <BR>
>
> <BR>
>
> <asp:Button id="SubmitButton" runat="server" Text="Submit" Visible="False"
>

>></asp:Button>

>
>
>
>
>
>
> Then put this code into the code behind:
>
>
>
> Private TextBoxCount, TextBoxLoop As Int32
>
> Protected WithEvents Label1 As System.Web.UI.WebControls.Label
>
> Protected WithEvents SubmitButton As System.Web.UI.WebControls.Button
>
> Private Sub Page_Load(ByVal sender As System.Object, ByVal e As
> System.EventArgs) Handles MyBase.Load
>
> If IsPostBack Then
>
> TextBoxCount = CType(ViewState("TextBoxCount"), Int32)
>
> For TextBoxLoop = 1 To TextBoxCount
>
> Call LoadTextBox(TextBoxLoop)
>
> Next
>
>
>
> ViewState("TextBoxCount") = TextBoxCount
>
> End If
>
> End Sub
>
> Private Sub DropDownList1_SelectedIndexChanged(ByVal sender As
> System.Object, ByVal e As System.EventArgs) Handles
> DropDownList1.SelectedIndexChanged
>
> Page.Validate()
>
> If Page.IsValid Then
>
> Label1.Text = ""
>
>
>
> PlaceHolder1.Controls.Clear()
>
>
>
> TextBoxCount = CType(DropDownList1.SelectedValue, Int32)
>
> For TextBoxLoop = 1 To TextBoxCount
>
> Call LoadTextBox(TextBoxLoop)
>
> Next
>
>
>
> SubmitButton.Visible = True
>
> ViewState("TextBoxCount") = TextBoxCount
>
> End If
>
> End Sub
>
> Private Sub LoadTextBox(ByVal Id As Int32)
>
> Dim TextBox As New TextBox
>
> TextBox.ID = "TextBox" & Id.ToString
>
> PlaceHolder1.Controls.Add(TextBox)
>
>
>
> Dim LiteralControl As New LiteralControl
>
> LiteralControl.Text = "<br><br>"
>
> PlaceHolder1.Controls.Add(LiteralControl)
>
> End Sub
>
> Private Sub SubmitButton_Click(ByVal sender As System.Object, ByVal e As
> System.EventArgs) Handles SubmitButton.Click
>
> Label1.Text = ""
>
>
>
> Dim ControlsCount, ControlsLoop As Int32
>
> Dim ControlType As String
>
> Dim TextBox As TextBox
>
> ControlsCount = PlaceHolder1.Controls.Count - 1
>
> For ControlsLoop = 0 To ControlsCount
>
> '---To be able to see in debugger what is returned
>
> ControlType =
> PlaceHolder1.Controls(ControlsLoop).GetType.ToStri ng
>
> If ControlType = "System.Web.UI.WebControls.TextBox" Then
>
> TextBox = CType(PlaceHolder1.Controls(ControlsLoop),
> TextBox)
>
> Label1.Text &= TextBox.Text
>
> If (ControlsLoop + 1) < ControlsCount Then
>
> Label1.Text &= " | "
>
> End If
>
> End If
>
> Next
>
> End Sub
>
> Notice where I assign the text boxes their Id? You could assign that from a
> database, etc.
>
> Sincerely,
>