// JavaScript Document
function verifyClient(){
	var cname = document.getElementById("cname");	
	var oname = document.getElementById("oname");
	var addr = document.getElementById("addr");
	var ph = document.getElementById("ph");
	var email = document.getElementById("email");
	var service = document.getElementById("service");
	var sdate = document.getElementById("sdate");
	var dur = document.getElementById("dur");
	var brf = document.getElementById("brf");
	
	if(cname.value == ""){
		alert("Please enter your name.");
		cname.focus();
		return false;
	}
	
	if(oname.value == ""){
		alert("Please enter your organization/company name.");
		oname.focus();
		return false;
	}

	if(ph.value == "" || !checkInternationalPhone(ph.value)){
		alert("Please enter your telephone/phone number in international format ie +91-9987651233.");
		ph.focus();
		return false;
	}

	if(!echeck(email.value)){
		email.focus();
		return false;
	}

	if(service.value == ""){
		alert("Please enter your service area.");
		service.focus();
		return false;
	}
	
	if(dur.value != "" && !isNumeric(dur.value)){
		alert("Duration should be numeric.");
		dur.focus();
		return false;
	}
	
	if(brf.value == ""){
		alert("Please enter some brief about the project.");
		brf.focus();
		return false;
	}
	
	return true;
}


function isNumeric(sText)
{
   var ValidChars = "0123456789.";
   var IsNumber=true;
   var Char;
	
	if(sText == "")
		return false;
 
   for (i = 0; i < sText.length && IsNumber == true; i++) 
   { 
      Char = sText.charAt(i); 
      if (ValidChars.indexOf(Char) == -1) 
      {
         IsNumber = false;
      }
   }
   return IsNumber;
}

function echeck(str) 
{

		var at="@"
		var dot="."
		var lat=str.indexOf(at)
		var lstr=str.length
		var ldot=str.indexOf(dot)
		if (str.indexOf(at)==-1){
		   alert("Invalid E-mail ID")
		   return false
		}

		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		   alert("Invalid E-mail ID")
		   return false
		}

		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		    alert("Invalid E-mail ID")
		    return false
		}

		 if (str.indexOf(at,(lat+1))!=-1){
		    alert("Invalid E-mail ID")
		    return false
		 }

		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		    alert("Invalid E-mail ID")
		    return false
		 }

		 if (str.indexOf(dot,(lat+2))==-1){
		    alert("Invalid E-mail ID")
		    return false
		 }
		
		 if (str.indexOf(" ")!=-1){
		    alert("Invalid E-mail ID")
		    return false
		 }

 		 return true					
}

// 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);
}