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Item Type: NewsGroup Date Entered: 11/18/2003 7:29:06 PM Date Modified: Subscribers: 0 Subscribe Alert
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theangrycoder
Asp.Net User
Cutsom Validator Problem.11/18/2003 7:29:06 PM

0/0

Hi,

I was creating a custom validator control to validate email box. I created that successfully, But only one problem. That is, it was supposed to validate on client side, but it is going to server and then displays error message. Is there anyone who can help me that where am I wrong? Here is the complete code of my class.


Imports System
Imports System.Web
Imports System.Web.UI
Imports System.Collections
Imports System.Text.RegularExpressions

Namespace stiLLangrY
Public Class ValidateEMail
Inherits System.Web.UI.WebControls.BaseValidator

Private _textBox As System.Web.UI.WebControls.TextBox

'Constructor
Public Sub New()
MyBase.New()
MyBase.IsValid = True
End Sub

'custom function to validate. Note just sample text is here. Original functionality is to written.
Private Function isValidEMail(ByVal text As String) As Boolean
If text = "sameers" Then
MyBase.IsValid = True
Return True
Else
MyBase.ErrorMessage = "DEMO: Invalid EMail address"
MyBase.IsValid = False
Return False
End If
End Function
'Overwridden function. On validation, this function is called. Return true if text is valid, else false.
Protected Overrides Function EvaluateIsValid() As Boolean
Return isValidEMail(_textBox.Text)

End Function

'Overwridden function to validate if right control was specified to validate
Protected Overrides Function ControlPropertiesValid() As Boolean
Dim ctrl As Control = FindControl(MyBase.ControlToValidate)

If ctrl Is Nothing Then
Return False
Else
If TypeOf ctrl Is System.Web.UI.WebControls.TextBox Then
'Yes, it is textbox control
_textBox = CType(ctrl, System.Web.UI.WebControls.TextBox)
Return Not (_textBox Is Nothing)
Else
'No, It's not a textbox control
Return False
End If
End If
End Function
End Namespace


Repeating again, this control is working fine, but it goes to server (post back) and then displays error. I don't want to let it go on server instead, as regular controls displays messages before posting form back to server.

Thanks,

Sameers
Sameers (theangrycodeR)
http://www.theangrycoder.com/IamAway.aspx
PLBlum
Asp.Net User
Re: Cutsom Validator Problem.11/19/2003 4:22:52 AM

0/0

Hi Sameers,

Custom Validators require you to write the JavaScript that is used on the client side and export it out within your validator code, usually using the Page.RegisterClientScriptBlock method. See the .Net topic:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfsystemwebuiwebcontrolscustomvalidatorclasstopic.asp

There is an easier way. Use a RegularExpressionValidator. It provides both client and server side. You only need to find a regular expression pattern for email addresses. Here's one I've used:
^([\w\.!#\$%\-+.]+@[A-Za-z0-9\-]+(\.[A-Za-z0-9\-]+)+)

Don't forget that all validators work on IE on the client side but don't support other browsers. If you need to support other browsers, check out Professional Validation And More.
--- Peter Blum
Creator of Professional Validation And More Suite, Peter's Date Package, and Peter's Polling Package
www.PeterBlum.com
2 Items, 1 Pages 1 |< << Go >> >|


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