validate Textbox in Web User Control from web form?


I have a web user control that contains a textbox.  I need to add some validation (like requiredfieldvalidator, comparevalidator, etc).

I would normally add the validator to my web user control by placing the validator next to my textbox.  However, I need the validation message somewhere else on my web form, not near the user control.

So how would I associate a validation control on my web form with the text box inside my web user control?  Can this be done; any alternatives out there?



5/23/2006 7:42:48 PM 93655 articles. 6 followers. Follow

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The error message should occur wherever you place the validation control.


Ryan Olshan
ASPInsider | Microsoft MVP, ASP.NET

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5/23/2006 8:10:46 PM


Yes - thank you.  I know that's how it would work if I was validating a regular server control on my web form.

However, I want to have a validator on my web form that validates a textbox in a web user control.  If I create a validator on my web form and look at its properties in the property window of VS2005, I don't see my web user control as an option to be the field validated.

Make sense?

5/23/2006 8:18:58 PM

Oh. Nevermind. This was one of those things that I read 2x and thought I got it, then submitted and understood the actual thread. Smile [:)]

At the moment, I'm not seing this as easy to do, so let me give this some thought.


Ryan Olshan
ASPInsider | Microsoft MVP, ASP.NET

How to ask a question
5/23/2006 8:21:12 PM

I am still relatively new to ASP.NET and pretty much any kind of MS specific development.

I realize it is two month later so I'm sure you've either figured out your problem or moved on.  I was hoping to do something similar, yet take it slightly further.  I want to do the same thing, but have validators enableclientscript="true" property set.  I have been able to accomplish what you want with server side validation by adding the ValidationPropertyAttribute: attribute to the user control class definition as follows.

public partial class DatePicker : System.Web.UI.UserControl
/// <summary>Gets or sets the DatePicker Date text.</summary>
  public string SelectedDate 
      return txtDate.Text; 
      txtDate.Text = value; 
[ValidationPropertyAttribute("SelectedDate")] [ControlValuePropertyAttribute("SelectedDate")] public partial class WebUserControl : System.Web.UI.UserControl { #region fields //determines if txtDate is autopopulated with current date on pageload bool _autoPopulateCurrentDate = false; #endregion fields #region Properties /// Gets or sets the DatePicker Date text. public string SelectedDate { get { return txtDate.Text; } set { txtDate.Text = value; } }
7/24/2006 7:43:27 PM

sorry about that, apparently if you hit the tab key when entering text the focus changes to the "post" button, then if you hit space real quick it submits.

Anyways, what I've found is that the client script generated automatically by the validators does not work with my user control.  I'm assuming that this is because a postback is required to return txtDate.Text; from the user control property "SelectedDate".  Is there another way to make this property available to the client script generated by the validators.  Basically I'm trying to avoid writing a new validator with javascript and using the clientID property of the text box inside the user control and breaking the nice data abstraction model, which is the whole reason I made a user control in the first place.

Hopefully that made some sense to somebody out there

7/24/2006 7:51:00 PM

The ValidationPropertyAttribute is built around server side concepts. After all, it identifies a property on a server side object.

The only way to get the existing client-side validators to work is by abandoning your UserControl idea. The client-side validators need the ControlToValidate's ID to point to the actual TextBox control, because they try to retrieve the value of <input type='text' id='[ClientID of the textbox]' />.

Suggestion: instead of creating your own Usercontrol for a datepicker, use one of the many that have been created (and are not usercontrols, so they setup their ID to work property with client-side validators). Many of them provide a good popup calendar that uses javascript to handle user's clicks so there is no post back. You will find Datepickers at this site's control gallery,, and Mine is Peter's Date Package.

--- Peter Blum
Creator of Peter's Data Entry Suite (formerly Professional Validation And More and Peter's Date Package) and Peter's Polling Package
7/24/2006 10:47:58 PM
Thanks for the reply, very informative
7/25/2006 6:58:07 PM

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