How to use Custom Validator in Asp.Net

How to use Custom Validator in Asp.Net
---------------------------------------------------

This is the HTML section of Custom Validator Control.

<asp:CustomValidator ID="custVal" runat="Server" ValidationGroup="grpProductAdd"
Display="None" ErrorMessage="Please, Enter Product Amount." ClientValidationFunction="CheckProduct">
</asp:CustomValidator>

We need a javascript function to use Custom Validation that return either 'true' or 'false' result.

<script language="javascript" type="text/javascript">

// You must use this both parameter with your function, because by it Validator validate the result.
function CheckProduct(sender, args)
{
// This is the variable name by which we can identify true/false result.
var Check = 0;


var ProductVal = document.getElementById('txtProductVal').value;
if (ProductVal = '')
{
Check = 0
}
else
{
Check = 1
}


// If your condition become true
if (Check == '0' )
{
args.IsValid = false;
}
else
{
args.IsValid = true;
}
}
</script>

That's It !
Hope you will like it.

Use Regular Expression by JavaScript

Use Regular Expression by JavaScript
===============================

    1 function validateEmail()

    2     {

    3         // Value to Validate. Ex. Your EMail Address TextBox

    4         var EMailID = document.getElementById('txtEMail').value;

    5 

    6         // Here, we set the Expression to Validate the Value for EMail Address.

    7         var EMailValidate = /^([a-zA-Z0-9])+([\.a-zA-Z0-9_-])*@([a-zA-Z0-9])+(\.[a-zA-Z0-9_-]+)+$/;

    8 

    9         // Test the Validator.

   10         if( EMailValidate.test(EMailID)) 

   11         {

   12             alert('Right Email Address.');

   13         }

   14         else

   15         {

   16             alert('Wrong Email Address.');

   17         }

   18     }    

Custom Validator with Javascript

Sample Example of Custom Validator to check Length of Textbox
=======================================================

1. Create Javascript function

function CheckLength(events, args)
{
var x = (document.getElementById(txtSKU).value);
if(x != '')
{
if(x.length < isvalid =" false;" isvalid =" true;">

2. Use one Custom Validator

EnableClientScript="true" Display="None" ClientValidationFunction="CheckLength"

3. Declare Variable in CS file

Page.ClientScript.RegisterStartupScript(this.GetType(), "CustomValidationTestForSKU", "var txtSKU='" + this.txtSKU.ClientID + "';", true);

Use Validation Expression of Field Validators in Asp.Net

Validation Expression for Field Validator
======================================
1. Multiple E-Mail Validation [ Separated by Semicolon ';' ] ( For Regular Expression Validator )

^(([a-zA-Z0-9_\-\.]+)@([a-zA-Z0-9_\-\.]+)\.([a-zA-Z]{2,5}){1,25})+
([;.](([a-zA-Z0-9_\-\.]+)@([a-zA-Z0-9_\-\.]+)\.([a-zA-Z]{2,5}){1,25})+)*$

2. Multiple E-Mail Validation ( For Regular Expression Validator )

\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*([,;]\s*\w+([-+.]\w+)*@\w+
([-.]\w+)*\.\w+([-.]\w+)*)*

3. File Exteansion Validator ( For Regular Expression Validator )

^(([a-zA-Z]:)|(\\{2}\w+)\$?)(\\(\w[\w].*))+(.jpg|.jpeg|.gif|.bmp|.tif|.png)$

4. Validate only Numeric Fields. ( For Regular Expression Validator )

^([0-9]{1,})$

5. Price / Amount Validation ( For Regular Expression Validator )

[0-9]{0,3}\.{0,1}[0-9]{0,2}
(^\d*\.?\d*[0-9]+\d*$)|(^[0-9]+\d*\.\d*$)
^\d+(?:\.\d{0,2})?$
(^\d*\.\d{2}$)

6. Wesite Address Validation ( For Regular Expression Validator )

(http|ftp|https):\/\/[\w\-_]+(\.[\w\-_]+)+([\w\-\.,@?^=%&:/~\+#]*[\w\-\@?^=%&/~\+#])?