alert box appear already exists

[muralibobby2015]

hello...
i am doing registration form .in this without submit form can i get alert box....email already exists using javascript. can any body tell me.

thnks.

[darkagn]

If you google "javascript alert" you will find many examples of how to create a javascript alert box.

Your algorithm should follow these steps:
1. Get the entered email address from the form.
2. Validate the email address has a valid format.
3. Use SQL statement to see if the email address exists in your database.
4. Display an error message in an alert if the email does exist.

[muralibobby2015]

If you google "javascript alert" you will find many examples of how to create a javascript alert box.

Your algorithm should follow these steps:
1. Get the entered email address from the form.
2. Validate the email address has a valid format.
3. Use SQL statement to see if the email address exists in your database.
4. Display an error message in an alert if the email does exist.

i am using like this ...but it is not working.

email=window.document.create_profile.email.value;
var emailFormat = /^\w(\.?[\w-])*@\w(\.?[\w-])*\.[a-zA-Z]{2,6}(\.[a-zA-Z]{2})?$/i;
if(email== "")
{	
	alert("Please enter Email Id.");
	window.document.create_profile.email.focus();
	return false;
		
}

if(email!= "")
{	
	var eres=email.search(emailFormat);
	if(eres == -1)
	{
		alert("Please Enter Valid Email Id ");
		window.document.create_profile.email.select();
		return false;
	}
	else
	{
	
	<?
	$selectemail=mysql_query("select * from workseeker_registration");
	while($fetchemail=mysql_fetch_array($selectemail))
	{
	
	?>
	
var existemail=<?=$fetchemail['email']?>;

	if(email==existemail)
	{
	alert("This email already exists");
		window.document.create_profile.email.select();
		return false;
		}
	<?
	}
	?>
	}
}
else
{
return true;
}

Check with google whether gotFocus and lostFocus available for textboxes, if it is, then you can call your javascript code on lostfocus to avoid the submit button validate.