// JavaScript Document
function echeck(email)
{
//alert(email);
var at=email.indexOf('@');
var dot=email.lastIndexOf('.');
var atpos=email.lastIndexOf('@');
var emlen=email.length;
if (at<1||dot-at<2||atpos+1==emlen||dot+1==emlen||emlen-dot<3) 
  {
  alert('invalid email address');
  return false
  }
return true;
} 

//Form validation starts here;
	function valid()
	{   			
		if(document.f1.totalamount.value=="")
		{
			alert("Buy the Products to continue");
			document.f1.totalamount.focus();
			return false;
		}		
		if(document.f1.name.value=="")
		{
			alert("Enter Your Name");
			document.f1.name.focus();
			return false;
		}
		else if(!nvalid(document.f1.name.value))
		 {
		 document.f1.name.value='';
		 document.f1.name.focus();
		 return false;
		 } 
		if(document.f1.surname.value=="")
		{
			alert("Enter Your Surname");
			document.f1.surname.focus();
			return false;
		}

		if(document.f1.phone.value=="")
        {
			alert("Enter the Telephone number");
			document.f1.phone.value="";
			document.f1.phone.focus();
			return false;
        }
		else if (document.f1.phone.value!="")
	  	{
		if(!phcheck(document.f1.phone.value))
		{
			document.f1.phone.value="";
			document.f1.phone.focus();
			return false;
   		}

		}	
	 if(document.f1.email.value=="")
		{
		alert("please enter your User Email ID");
		document.f1.email.focus();
		return false;
		}
	else if (document.f1.email.value!="")
		{
			if(!echeck(document.f1.email.value))
			{
			document.f1.email.focus();
			return false;
			}
		} 		
		if(document.f1.address.value=="")
		{
			alert("Enter Your Delivery Address");
			document.f1.address.focus();
			return false;
		}		 
		if(document.f1.paymode_2.checked==false && document.f1.paymode_1.checked==false)
		   {	   
		   	if(!check_ccard())
		   {
		   	return false;   
		   }  
		   }			
				
		return true;
	}
	//credit card validation
   function check_ccard()
	{
    var sel=document.getElementById("cctype");
	var res=sel.options[sel.selectedIndex].text;
	var cardMonth=document.getElementById("edm").value;
	var cardYear=document.getElementById("edy").value;
	 if(document.getElementById("ccname").value=='')
     {
	  alert('Enter the Credit card holder name');
	 document.getElementById("ccname").focus();
	 return false;
	 }
	else if(!nvalid(document.getElementById("ccname").value))
	 {
	 document.getElementById("ccname").value='';
	 document.getElementById("ccname").focus();
	 return false;
	 } 
	 if(res=="Card Type")
         {
         alert("Select your Credit card type");
		 document.getElementById("cctype").focus();
         return false;
         }
  if(document.getElementById("ccnumber").value=='')
     {
	 alert('Enter the Credit card number');
	 document.getElementById("ccnumber").focus();
	 return false;
	 }	
 else if(document.getElementById("ccnumber").value!='') 
	{	
		if(!isValidCreditCard(res,document.getElementById("ccnumber").value))
	 	{
			 alert('Please enter the correct number');
			 document.getElementById("ccnumber").value='';
			 document.getElementById("ccnumber").focus();
			 return false;
		}
	}	
  if(document.getElementById("scode").value=='')
     {
	 alert('Enter the Security Code');
	 document.getElementById("scode").focus();
	 return false;
	 }
 else if(document.getElementById("scode").value!='')
     {
		 if(isNaN(document.getElementById("scode").value))
		 {
		 alert('Only Numericals are Allowed');
		 document.getElementById("scode").value="";
		 document.getElementById("scode").focus();
		 return false;
		 }
	 }
  if(document.getElementById("edm").value=="")
     {
     alert("Select the expiry month");
	 document.getElementById("edm").focus();
     return false;
     }
  if(document.getElementById("edy").value=="")
     {
     alert("Select the expire year");
	 document.getElementById("edy").focus();
     return false;
     }	 
 if(!isExpiryDate(cardMonth,cardYear )) 
	 {
	 alert("Sorry! The card was expired.");
	 return false;
     }
	 return true ;
	 }		
	 


function isValidCreditCard(type, ccnum) {
//alert("hai");
//alert(type);
   if (type == "Visa") {
      // Visa: length 16, prefix 4, dashes optional.
      var re = /^4\d{3}-?\d{4}-?\d{4}-?\d{4}$/;
   } else if (type == "MasterCard") {
      // Mastercard: length 16, prefix 51-55, dashes optional.
      var re = /^5[1-5]\d{2}-?\d{4}-?\d{4}-?\d{4}$/;
   } else if (type == "Amex") {
      // American Express: length 15, prefix 34 or 37.
      var re = /^3[4,7]\d{13}$/;
   } else if (type == "Diners") {
      // Diners: length 14, prefix 30, 36, or 38.
      var re = /^3[0,6,8]\d{12}$/;
   }
      
   if (!re.test(ccnum))
   {
   alert("Invalid credit card number");
   return false;
   }
   // Remove all dashes for the checksum checks to eliminate negative numbers
   ccnum = ccnum.split("-").join("");
   // Checksum ("Mod 10")
   // Add even digits in even length strings or odd digits in odd length strings.
   var checksum = 0;
   for (var i=(2-(ccnum.length % 2)); i<=ccnum.length; i+=2) {
      checksum += parseInt(ccnum.charAt(i-1));
   }
   // Analyze odd digits in even length strings or even digits in odd length strings.
   for (var i=(ccnum.length % 2) + 1; i<ccnum.length; i+=2) {
      var digit = parseInt(ccnum.charAt(i-1)) * 2;
      if (digit < 10) { checksum += digit; } else { checksum += (digit-9); }
   }
   if ((checksum % 10) == 0)
   {
   //alert("Success");
   return true;  
   }
   else 
   {
   alert("Credit card number not valid");
   return false;
}
return true;
}

function nvalid(name)
{
var spChars="`~!@#$%^&*()+='/\|{}[]?:;";
    for(var i=0;i<name.length;i++)
	{
	if(spChars.indexOf(name.charAt(i))!=-1)
	{
	alert(name+'special characters not allowed');
	return false;
	}
	}
return true;
}
function isExpiryDate(month,year)
 {
 //alert(year);
  today = new Date();
expiry = new Date(year, month);
//alert(expiry);
if (today.getTime() > expiry.getTime())
{
//alert("fail")
return false;
}
else
{
//alert("success")
return true;
}
}

//for phone number check
function phcheck(pnum)
  {
  var phchar="1234567890 -_+.()";
  for (i=0;i<=pnum.length;i++)
    {	
	if(phchar.indexOf(pnum.charAt(i))==-1)
	  {	  
	  alert("Only Numbers and (+-_. ) are allowed");
	  return false ;
	  }	
	}
  return true ;
  }
  
//for square metres number check
function sqcheck(pnum)
  {
  var phchar="1234567890";
  for (i=0; i<=pnum.length; i++)
    {	
	if(phchar.indexOf(pnum.charAt(i))==-1)
	  {	  
	  alert("Enter Numbers with out decimals.Ex: 20 not 19.50");
	  return false ;
	  }	
	}
  return true ;
  }