// JavaScript Document

function isEmpty(str){
  return (str == null) || (str.length == 0);
}
// returns true if the string is a valid email
function isEmail(str){
  if(isEmpty(str)) return false;
  var re = /^[^\s()<>@,;:\/]+@\w[\w\.-]+\.[a-z]{2,}$/i
  return re.test(str);
}
// returns true if the string only contains characters A-Z or a-z
function isAlpha(str){
  var re = /[^a-zA-Z]/g
  if (re.test(str)) return false;
  return true;
}
// returns true if the string only contains characters 0-9
function isNumeric(str){
  var re = /[\D]/g
  if (re.test(str)) return false;
  return true;
}
// returns true if the string only contains characters A-Z, a-z or 0-9
function isAlphaNumeric(str){
  var re = /[^a-zA-Z0-9]/g
  if (re.test(str)) return false;
  return true;
}
// returns true if the string's length equals "len"
function isLength(str, len){
  return str.length >= len;
}
// returns true if the string's length is between "min" and "max"
function isLengthBetween(str, min, max){
  return (str.length >= min)&&(str.length <= max);
}
// returns true if the string is a US phone number formatted as...
// (000)000-0000, (000) 000-0000, 000-000-0000, 000.000.0000, 000 000 0000, 0000000000
function isPhoneNumber(str){
  var re = /^\(?[2-9]\d{2}[\)\.-]?\s?\d{3}[\s\.-]?\d{4}$/
  return re.test(str);
}
// returns true if the string is a valid date formatted as...
// mm dd yyyy, mm/dd/yyyy, mm.dd.yyyy, mm-dd-yyyy
function isDate(str){
  var re = /^(\d{1,2})[\s\.\/-](\d{1,2})[\s\.\/-](\d{4})$/
  if (!re.test(str)) return false;
  var result = str.match(re);
  var m = parseInt(result[1]);
  var d = parseInt(result[2]);
  var y = parseInt(result[3]);
  if(m < 1 || m > 12 || y < 1900 || y > 2100) return false;
  if(m == 2){
          var days = ((y % 4) == 0) ? 29 : 28;
  }else if(m == 4 || m == 6 || m == 9 || m == 11){
          var days = 30;
  }else{
          var days = 31;
  }
  return (d >= 1 && d <= days);
}
// returns true if "str1" is the same as the "str2"
function isMatch(str1, str2){
  return str1 == str2;
}
// returns true if the string contains only whitespace
// cannot check a password type input for whitespace
function isWhitespace(str){ // NOT USED IN FORM VALIDATION
  var re = /[\S]/g
  if (re.test(str)) return false;
  return true;
}
// removes any whitespace from the string and returns the result
// the value of "replacement" will be used to replace the whitespace (optional)
function stripWhitespace(str, replacement){// NOT USED IN FORM VALIDATION
  if (replacement == null) replacement = '';
  var result = str;
  var re = /\s/g
  if(str.search(re) != -1){
    result = str.replace(re, replacement);
  }
  return result;
}

function validateElement(str,msg)
{
	if(str.value=='')
	{
		alert(msg);
		str.focus();
		return true;
	}
}
function validateForm(form1)
{
	var name=document.getElementById('name').value;
	var password=document.getElementById('password').value;
	var email=document.getElementById('email').value;
	var phone=document.getElementById('phone').value;
	var address=document.getElementById('address').value;
	if(isEmpty(name))
	{
		alert('Please Enter Your name');
		document.getElementById('name').focus();
		return false;
	}
	if(!isAlphaNumeric(name))
	{
		alert('user name A-Z a-z 0-9 only valid');
		document.getElementById('name').focus();
		return false;
	}
	if(!isLength(name,5))
	{
		alert('user name should be min 5 characters');
		document.getElementById('name').focus();
		return false;
	}
	
	if(isEmpty(password))
	{
		alert('Please Enter Your Password');
		document.getElementById('password').focus();
		return false;
	}
	if(!isLength(password,6))
	{
		alert('password should be 6 characters');
		document.getElementById('password').focus();
		return false;
	}
	
	if(isEmpty(email))
	{
		alert('Please Enter Your Email');
		document.getElementById('email').focus();
		return false;
	}
	
	if(!isEmail(email))
	{
		alert('Please Enter Valid Email');
		document.getElementById('email').focus();
		return false;
	}
	
	if(isEmpty(phone))
	{
		alert('Please Enter Your Phone No');
		document.getElementById('phone').focus();
		return false;
	}
	if(!isPhoneNumber(phone))
	{
		alert('Please Enter Valid Phone No');
		document.getElementById('phone').focus();
		return false;
	}
	
	if(isEmpty(address))
	{
		alert('Please Enter Your Address');
		document.getElementById('address').focus();
		return false;
	}
	return true;
}