Server Control ID

lmxu · October 20th, 2003, 03:08 PM

Hello,

I'm looking for a way to assign dynamic ID to server controls without using the <asp:placeholder> and then add the server control to the placeholder in my code-behind.

For example,

I want something like <asp:panel ID="<%=i%>" runat="server" /> ...
but I'm getting an error <%=i%> is not a valid identifier.. I also tried with single quote '<%=i%>'

any help will be helpful. thanks.

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Edit post

BTW... I also noticed that a variable value is losted with in <asp:panel>

for example

<% for (int i=0; i<3; i++){%>

   <asp:panel ID="test">
         <%=i%>
   </asp:panel>

<% } %>

I would get an error "The name 'i' does not exist in the class or namespace 'ASP.test_page.aspx'

The reason I don't use a DataList/Repeat/etc in this situation is purely for testing purpose. Thanks again

Any Clues?

my_xml · November 19th, 2003, 07:40 AM

hello..
i am new to asp.net and xml...i have got a page with links ..what i want is...when i click on a link it will call and aspx page and depending on which link is clicked the perticular xml file will be loaded...please help...
Thanks

Imar · November 20th, 2003, 06:41 AM

Hi there,

What you're trying to do is not possible. You can't create dynamic IDs when creating controls with declarative syntax.

What you could do is create the controls in code (in your Code Behind page, or in a method in code in your ASPX page). You can assign IDs to the controls and then add them to the page, like this:

Code:

Label myLabel = null;
for (int i = 0; i < 10; i++)
{
    myLabel = new Label();
    myLabel.ID = "lbl" + i.ToString();
    myLabel.Text = "Label " + i.ToString();
    this.Controls.Add(myLabel);
}

This will add a bunch of Labels to the page, each with a different, dynamically generated ID.

What exactly are you trying to accomplish? The code I posted here will get you into troubles when you try to access these controls and their values again because they no longer exist.

If you need repeating controls, take a look at the the asp:Repeater control. It's designed to repeat data and allows for nested controls.

HtH,

Imar

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Imar Spaanjaars
Everyone is unique, except for me.