gistfile1.txt

function validateLogin(input){
	if(input.val().length < 1){
		addMessage(input.parent(), 'Please provide login');
		return false;
	}
	if(!input.val().match(/^[a-zA-Z0-9_-]+$/)){
		addMessage(input.parent(), 'Provided login contains invalid characters (letters, numbers, hyphen and underscore allowed)');
		return false;
	}
	$.get("isLoginAvailable/" + $("#login").val(), function(data){
		if(data['available']){
			$("#formId").submit();
			addMessage(input.parent(), null);
		}else
			addMessage(input.parent(), 'This login is not available');
	}, "json");
	return false;
}