is_email() JavaScript Function


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is_email

This is a small, lightweight function for JavaScript that I use in conjunction with jQuery frequently. I call it, is_email. Here is the function, and if you know JS this will make sense right away:

function is_email(email){
	var result = email.search(/^([a-zA-Z0-9_\.\-\+])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z]{2,3})+$/);
	if(result > -1){ return true; } else { return false; }
}

I use it with jQuery all the time. Here is an example on how to use it with jQuery:

$('#email_field').blur(function(){//When they tab/click out of the field...
	if(!is_email($(this).val())){//If the email field's value is NOT a valid email...
		$(this).removeClass('good').addClass('error'); //Remove "good" class if exists, and add error class
	}
	else{
		$(this).removeClass('error').addClass('good'); //If it's a valid email, remove error class and add good class
	}
});

You can view an example live at:
projectdeploy.org/contact.php

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Posted in Programming, jQuery