/*
Javascript validation script for the newsletter signup form.
Script checks if name has been filled in, and if email address is valid.
*/


function isValidEmail(email, required) {
    if (required==undefined) {   // if not specified, assume it's required
        required=true;
    }
    if (email==null) {
        if (required) {
            return false;
        }
        return true;
    }
    if (email.length==0) {  
        if (required) {
            return false;
        }
        return true;
    }
    if (! allValidChars(email)) {  // check to make sure all characters are valid
        return false;
    }
    if (email.indexOf("@") < 1) { //  must contain @, and it must not be the first character
        return false;
    } else if (email.lastIndexOf(".") <= email.indexOf("@")) {  // last dot must be after the @
        return false;
    } else if (email.indexOf("@") == email.length) {  // @ must not be the last character
        return false;
    } else if (email.indexOf("..") >=0) { // two periods in a row is not valid
	return false;
    } else if (email.indexOf(".") == email.length) {  // . must not be the last character
	return false;
    }
    return true;
}

function allValidChars(email) {
  var parsed = true;
  var validchars = "abcdefghijklmnopqrstuvwxyz0123456789@.-_";
  for (var i=0; i < email.length; i++) {
    var letter = email.charAt(i).toLowerCase();
    if (validchars.indexOf(letter) != -1)
      continue;
    parsed = false;
    break;
  }
  return parsed;
}

function validateSignup() {

	var isError = false;

	if (document.getElementById('signup-name').value == '' || document.getElementById('signup-name').value == null){

		isError = true;
		document.getElementById('error-msg').innerHTML = '<i>*Please fill in your name</i>';
		document.getElementById('error-msg').style.display = 'block';
		
	}else if (! isValidEmail(document.getElementById('signup-email').value)) {		
	
		isError = true;
		document.getElementById('error-msg').innerHTML = '<i>*Please fill in a valid email address</i>';
		document.getElementById('error-msg').style.display = 'block';		
	}
	
	if(!isError){
	
		document.getElementById('error-msg').style.display = 'none';
		document.signupForm.submit();
	}
}