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[Solved] RequiredFieldValidator and RadComboBox

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ComboBox

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answered on 20 Dec 2007, 07:11 AM

AJAXEnabledWebSite32.zip

Hello Guido Tapia,

I tried to reproduce the problem, but to no avail. Attached, please find a small and running project on the matter.

If the InitialValue of the RequiredFieldValidator is set to the text of the first item that is selected by default upon page_load, the ErrorMessage will be shown when the page is loaded. You can set some custom text to the combobox (using the Text property of the control and enabling the AllowCustomText property) so that the ErrorMessage is not shown when page loads.

Hope this helps.

Regards,
Nick
the Telerik team

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answered on 20 Dec 2007, 08:01 PM

I thought the problem was clear, I must not have explained myself well. Basically the expected behaiour of the RequiredFieldValidator is to warn you that you have not entered/selected anything in a required field. It is not intended to tell you that you have not entered/selected something on initial page load as this is obvious.

Below is code that compares asp:DropDownList old radcontrol RadComboBox and telerik:RadComboBox (promethius). You will see that promithius behaves incorrectly.

NOTE: Setting the AllowCustomText to true is not a solution, it is an ugly work around at best. A much nicer work around is to do server side validation. I was hoping not to do that, so again I ask, is there any 'nice' work around to this bug.

Thanks

Guido Tapia

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<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Test.aspx.cs" Inherits="Test" %>
<%@ Register TagPrefix="telerik" Namespace="Telerik.Web.UI" Assembly="Telerik.Web.UI" %>
<%@ Register TagPrefix="rad" Namespace="Telerik.WebControls" Assembly="RadComboBox.NET2" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
<form id="f" runat="server">
  <asp:ScriptManager id="sm" runat="server"/>
  <asp:Button id="postback" runat="server" Text="Empty Postback Test" />
  <br/>
  <h2>Expected Behaviour</h2><br/>
  - Validator should not be shown on initial page load!!!!!!!
  <br/>
  <h1>asp:DropDownList</h1>
  <asp:DropDownList id="ddl1" runat="server">
   <asp:ListItem text="Select" />
   <asp:ListItem text="Item 1" />
   <asp:ListItem text="Item 2" />
   <asp:ListItem text="Item 3"/>
  </asp:DropDownList>
  <asp:RequiredFieldValidator id="v1" runat="server" Display="Dynamic" ErrorMessage="Error 1" ControlToValidate="ddl1" InitialValue="Select"/>

  <hr / >
  <h1>rad:RadComboBox (Old RadControls)</h1>
  <rad:RadComboBox id="ddl2" runat="server" AllowCustomText="false">
   <Items>
    <rad:RadComboBoxItem Text="Select" Selected="true"/>
    <rad:RadComboBoxItem Text="Item 1" />
    <rad:RadComboBoxItem Text="Item 2" />
    <rad:RadComboBoxItem Text="Item 3" />
   </Items>
  </rad:RadComboBox>
  <asp:RequiredFieldValidator id="v2" runat="server" Display="Dynamic" ErrorMessage="Error 2" ControlToValidate="ddl2" InitialValue="Select"/>

  <hr / >
  <h1>telerik:RadComboBox (Promithius)</h1>
  <telerik:RadComboBox id="ddl3" runat="server" AllowCustomText="false">
   <Items>
    <telerik:RadComboBoxItem Text="Select" Selected="true"/>
    <telerik:RadComboBoxItem Text="Item 1" />
    <telerik:RadComboBoxItem Text="Item 2" />
    <telerik:RadComboBoxItem Text="Item 3" />
   </Items>
  </telerik:RadComboBox>
  <asp:RequiredFieldValidator id="v3" runat="server" Display="Dynamic" ErrorMessage="Error 3" ControlToValidate="ddl3" InitialValue="Select"/>
</form>
</body>
</html>