//Email Validation Script

function validateEmail(addr,man,db) {
	if (addr == '' && man) {
	   if (db) alert('Email address is mandatory');
	   return false;
	}
	var invalidChars = '\/\'\\ ";:?!()[]\{\}^|';
	for (i=0; i<invalidChars.length; i++) {
	   if (addr.indexOf(invalidChars.charAt(i),0) > -1) {
		  if (db) alert('Email address contains invalid characters');
		  return false;
	   }
	}
	for (i=0; i<addr.length; i++) {
	   if (addr.charCodeAt(i)>127) {
		  if (db) alert("Email address contains non ascii characters.");
		  return false;
	   }
	}

	var atPos = addr.indexOf('@',0);
	if (atPos == -1) {
	   if (db) alert('Email address must contain an @');
	   return false;
	}
	if (atPos == 0) {
	   if (db) alert('Email address must not start with @');
	   return false;
	}
	if (addr.indexOf('@', atPos + 1) > - 1) {
	   if (db) alert('Email address must contain only one @');
	   return false;
	}
	if (addr.indexOf('.', atPos) == -1) {
	   if (db) alert('Email address must contain a period in the domain name');
	   return false;
	}
	if (addr.indexOf('@.',0) != -1) {
	   if (db) alert('period must not immediately follow @ in email address');
	   return false;
	}
	if (addr.indexOf('.@',0) != -1){
	   if (db) alert('period must not immediately precede @ in email address');
	   return false;
	}
	if (addr.indexOf('..',0) != -1) {
	   if (db) alert('two periods must not be adjacent in email address');
	   return false;
	}
	var suffix = addr.substring(addr.lastIndexOf('.')+1);
	if (suffix.length != 2 && suffix != 'com' && suffix != 'net' && suffix != 'org' && suffix != 'edu' && suffix != 'int' && suffix != 'mil' && suffix != 'gov' & suffix != 'arpa' && suffix != 'biz' && suffix != 'aero' && suffix != 'name' && suffix != 'coop' && suffix != 'info' && suffix != 'pro' && suffix != 'museum') {
	   if (db) alert('invalid primary domain in email address');
	   return false;
	}
return true;
}

 //Function phone validation Script
// Declaring required variables
var digits = "0123456789";
// non-digit characters which are allowed in phone numbers
var phoneNumberDelimiters = "()- ";
// characters which are allowed in international phone numbers
// (a leading + is OK)
var validWorldPhoneChars = phoneNumberDelimiters + "+";
// Minimum no of digits in an international phone no.
var minDigitsInIPhoneNumber = 10;

function isInteger(s)
{   var i;
    for (i = 0; i < s.length; i++)
    {   
        // Check that current character is number.
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }
    // All characters are numbers.
    return true;
}

function stripCharsInBag(s, bag)
{   var i;
    var returnString = "";
    // Search through string's characters one by one.
    // If character is not in bag, append to returnString.
    for (i = 0; i < s.length; i++)
    {   
        // Check that current character isn't whitespace.
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}

function checkInternationalPhone(strPhone)
{
	s=stripCharsInBag(strPhone,validWorldPhoneChars);
	return (isInteger(s) && s.length >= minDigitsInIPhoneNumber);
}

//script validation for date 
function date_valid(dateissue,dateissue2){
	var stdate=dateissue.split("/");
	var enddate=dateissue2.split("/");
	var prostdate = new Date();
	prostdate.setFullYear(stdate[2]);
	prostdate.setMonth(stdate[0]-1);
	prostdate.setDate(stdate[1]);
	
	var proenddate = new Date();
	proenddate.setFullYear(enddate[2]);
	proenddate.setMonth(enddate[0]-1);
	proenddate.setDate(enddate[1]);
	
	var startingdate = prostdate.getTime();
	var endingdate = proenddate.getTime();

	if(startingdate > endingdate)
	{
		return false;
	}
	return true;
}

//validation for inventors

function validation_contactus()
{
		if (document.frmContactus.txtName.value == "") 
		{
			alert ("Please enter the fullname");
			document.frmContactus.txtName.focus();
			return false;
		}
		
		var emailid = document.frmContactus.txtEmail.value;
		if ( emailid == "") 
		{
			alert ("Please enter the email address");
			document.frmContactus.txtEmail.focus();
			return false;
		}
		
		if (!validateEmail(emailid,1,1)) 
		{
		document.frmContactus.txtEmail.focus();
		return false;
		}
		
		if (document.frmContactus.txtName.value == "") 
		{
			alert ("Please enter the contact number");
			document.frmContactus.txtContact.focus();
			return false;
		}
		phone = document.frmContactus.txtPhoneNumber;
		if (checkInternationalPhone(phone.value)==false){
			alert("Please enter a valid phone number")
			phone.value=""
			phone.focus()
			return false
		}
		
		var password = document.frmContactus.txtComments.value;
		if ( password == "") 
		{
			alert ("Please enter the comments");
			document.frmContactus.txtComments.focus();
			return false;
		}
		
}