Target a specfic control in a ASP:DataList

I’m trying to find a way to make a asp:RegularExpressionValidor target a specific control when it is inside a asp:DataList

The asp:DataList is in the following code:

<asp:DataList ID="dlUserInputs" runat="server" DataKeyField="tagname" ItemStyle-CssClass="paddingBottom20" CssClass="layout">
    <ItemTemplate>
        <npo:UserInput ID="ctrlUserInput" runat="server" /> // user control 
    </ItemTemplate>
</asp:DataList>

the npo:UserInput contains the following code:

<%@ Control Language="VB" AutoEventWireup="false" CodeFile="UserInput.ascx.vb" Inherits="web_controls_publication_UserInput" %>

    ...
            <asp:Label ID="lblUserInput" runat="server" Visible="false" />
            <asp:TextBox ID="txtUserInput" runat="server" Visible="false" TextMode="MultiLine" Rows="10" Width="100%"/>
            <asp:RegularExpressionValidator ID="RegularExpressionValidator" runat="server"
             ErrorMessage="<%$ Resources:PageText, LETTER_GOODSANDSERVICESXML_WRONGFORMAT %>" ValidationExpression="^[Cc]lasss[0-9]{1,2}:s{1}[^n]*(?:r?n[Cc]lasss[0-9]{1,2}:s{1}[^n]*)*$"
            ControlToValidate="txtUserInput"></asp:RegularExpressionValidator>    
    ...

My problem is the RegularExpressionValidor validates the control txtUserInput but if my dataList calls,let’s say, 3 times this code, the validator will apply on the 3 txtUserInput occurences. I want it to apply only to the first

Thank you in advance for your advices

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Answers:

Method 1

Answers:

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Method 1

Yes this can be done. First add a property to UserInput.ascx code behind. In this case Validate

public partial class UserInput : System.Web.UI.UserControl
{
    public bool Validate { get; set; }

    protected void Page_Load(object sender, EventArgs e)
    {    
    }
}

Then bind the new variable to the Visible property of the RegularExpressionValidator

<asp:RegularExpressionValidator ID="RegularExpressionValidator" Visible='<%# Validate %>'

Then to enable the first item in the DataList, set the new Visible property in the aspx containing the UserControl.

<asp:DataList ID="dlUserInputs" runat="server">
    <ItemTemplate>
        <npo:UserInput ID="ctrlUserInput" Validate='<%# Container.ItemIndex == 0 %>' />
    </ItemTemplate>
</asp:DataList>

VB – using https://codeconverter.icsharpcode.net/

Public Partial Class UserInput
    Inherits Web.UI.UserControl

    Public Property Validate As Boolean

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
    End Sub
End Class

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0

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