Thread: JavaScript for enter valid Email Id

Hi. I am learning JavaScript language. I want to write JavaScript function for user enters valid Email-Id. If user enter email id in wrong format it will give error message. Your help would be greatly appreciated. Thanks in advanced.

Try out this code, when you run this function you can check the user enter valid email id or not:

Code:

function checkEmailID(frmName,fldName)
{
	if  (!(isNull(eval("document."+frmName+"."+fldName+".value"))))
	{
		if (/^w+([.-]?w+)*@w+([.-]?w+)*(.w{2,3})+$/.test(eval("document."+frmName+"."+fldName+".value")))
		{
			return true;
		} 
		else
		{
			alert("Invalid E-mail ID! Please re-enter.");
			eval("document."+frmName+"."+fldName+".focus()");
			return false;
		}
	}
	else
	{
		alert(" Please provide E-mail ID. ");
		eval("document."+frmName+"."+fldName+".focus()");
		return false;
	}
}

Refer following JavaScript for user enter valid email id:

Code:

function validate(form_id,email) 
{
   var reg = /^([A-Za-z0-9_-.])+@ ([A-Za-z0-9_-.])+.([A-Za-z]{2,4})$/;
   var address = document.forms[form_id].elements[email].value;
   if(reg.test(address) == false) {
      alert('Invalid Email Address');
      return false;
   }
}

If you are use asp.net then use following code. Hope this helps you out with your problem.

Code:

<asp:textbox id="txt_email" runat="server"/>
<asp:RegularExpressionValidator id="email_valid" runat="server"
    ControlToValidate="txt_email"
    ValidationExpression=".*@.*..*"
    ErrorMessage="* Enter Valid Email-Id."
    display="dynamic">
</asp:RegularExpressionValidator>