C# .NET - JavaScript

HI, i need a email validator in javaScript, which can able to judge is it a a valid email or not , and he Must Takes this Type Email also rahul.kumar@gmail.com (Means There may be more than 1 dot)

Here's a javascript that you can use to validate an email address, taken from the following link: http://www.freshmango.com/support/kb/web-design-programming/javascript/javascript-email-validation-with-regular-expressions/

<script type="text/javascript">

function validateEmail(){
var emailRegEx = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
str = document.getElementById('emailAddress').value;
if(str.match(emailRegEx)){
document.mailingListForm.submit();
}else{
alert('Please enter a valid email address.');
return false;
}
}
</script>

Regards,
http://www.sql-server-helper.com/faq/data-types-p01.aspx

try this good sample code using javascritp allow only (.,@,_,alpha bate).

for example-abc_123.xyz@gmail.com


<script language = "Javascript">
function echeck(str) {

        var at="@"
        var dot="."
        var lat=str.indexOf(at)
        var lstr=str.length
        var ldot=str.indexOf(dot)
        if (str.indexOf(at)==-1){
           alert("Invalid E-mail ID")
           return false
        }

        if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
           alert("Invalid E-mail ID")
           return false
        }

        if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
            alert("Invalid E-mail ID")
            return false
        }

         if (str.indexOf(at,(lat+1))!=-1){
            alert("Invalid E-mail ID")
            return false
         }

         if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
            alert("Invalid E-mail ID")
            return false
         }

         if (str.indexOf(dot,(lat+2))==-1){
            alert("Invalid E-mail ID")
            return false
         }
        
         if (str.indexOf(" ")!=-1){
            alert("Invalid E-mail ID")
            return false
         }

          return true                    
    }

function ValidateForm(){
    var emailID=document.frmSample.txtEmail
    
    if ((emailID.value==null)||(emailID.value=="")){
        alert("Please Enter your Email ID")
        emailID.focus()
        return false
    }
    if (echeck(emailID.value)==false){
        emailID.value=""
        emailID.focus()
        return false
    }
    return true
 }
</script>

this is the best I found and it works!


function isEmail(string) {
if (string.search(/^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/) != -1)
return true;
else
return false;
}

also u can use

 

function verifyEmail(form) {
checkEmail = form.email.value

if ((checkEmail.indexOf('@') < 0) || ((checkEmail.charAt(checkEmail.length-4) != '.') && (checkEmail.charAt(checkEmail.length-3) != '.')))
{alert("You have entered an invalid email address. Please try again.");
form.email.select();
return false;
}