// JavaScript Document

// Copyright © 2001 by Apple Computer, Inc., All Rights Reserved.
//
// You may incorporate this Apple sample code into your own code
// without restriction. This Apple sample code has been provided "AS IS"
// and the responsibility for its operation is yours. You may redistribute
// this code, but you are not permitted to redistribute it as
// "Apple sample code" after having made changes.

// email

// FUNCTION TO CHECK A DATE FIELD

var dtCh= "-";
var minYear=1900;
var maxYear=2100;

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++){   
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}

function daysInFebruary (year){
	// February has 29 days in any year evenly divisible by four,
    // EXCEPT for centurial years which are not also divisible by 400.
    return (((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28 );
}
function DaysArray(n) {
	for (var i = 1; i <= n; i++) {
		this[i] = 31
		if (i==4 || i==6 || i==9 || i==11) {this[i] = 30}
		if (i==2) {this[i] = 29}
   } 
   return this
}

function isDate(dtStr){
	var daysInMonth = DaysArray(12)
	var pos1=dtStr.indexOf(dtCh)
	var pos2=dtStr.indexOf(dtCh,pos1+1)
	
	//var strDay=dtStr.substring(0,pos1)
	//var strMonth=dtStr.substring(pos1+1,pos2)
	//var strYear=dtStr.substring(pos2+1)
	var strYear=dtStr.substring(0,pos1)
	var strMonth=dtStr.substring(pos1+1,pos2)
	var strDay=dtStr.substring(pos2+1)
	
//	var strMonth=dtStr.substring(0,pos1)
//	var strDay=dtStr.substring(pos1+1,pos2)
//	var strYear=dtStr.substring(pos2+1)

	strYr=strYear
	if (strDay.charAt(0)=="0" && strDay.length>1) strDay=strDay.substring(1)
	if (strMonth.charAt(0)=="0" && strMonth.length>1) strMonth=strMonth.substring(1)
	for (var i = 1; i <= 3; i++) {
		if (strYr.charAt(0)=="0" && strYr.length>1) strYr=strYr.substring(1)
	}
	month=parseInt(strMonth)
	day=parseInt(strDay)
	year=parseInt(strYr)
	if (pos1==-1 || pos2==-1){
		error="The Date Format Should Be : yyyy-mm-dd.\n"
		return false
	}
	if (strMonth.length<1 || month<1 || month>12){
		error="Please enter a valid month.\n"
		return false
	}
	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
		error="Please enter a valid day.\n"
		return false
	}
	if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
		error="Please enter a valid 4 digit year between "+minYear+" and "+maxYear + "..\n"
		return false
	}
	if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
		error="Please enter a valid date .\n"
		return false
	}
return true
}

function ValidateDate(dt,fieldname){
	//var dt=document.frmSample.txtDate
	if (isDate(dt)==false){
		error =   fieldname + " : " + error 
		return error
	}
	else
	{
		return true	
	}
    //return true
 }
// end of checkdate function


function checkEmail (strng) 
{
	var error="";
	if (strng == "") 
	{
	   error = "You didn't enter an email address.\n";
	}
	
	var emailFilter=/^.+@.+\..{2,3}$/;
	if (!(emailFilter.test(strng))) 
	{ 
	   error = "Please enter a valid email address.\n";
	}
	else 
	{
		//test email for illegal characters
		var illegalChars= /[\(\)\<\>\,\;\:\\\"\[\]]/
		if (strng.match(illegalChars))
		{
			error = "The email address contains illegal characters.\n";
		}
	}
	return error;    
}


// phone number - strip out delimiters and check for 10 digits

function checkPhone (strng) {
var error = "";
if (strng == "") {
   error = "You didn't enter a phone number.\n";
}

var stripped = strng.replace(/[\(\)\.\-\ ]/g, ''); //strip out acceptable non-numeric characters
    if (isNaN(parseInt(stripped))) {
       error = "The phone number contains illegal characters.";
  
    }
    if (!(stripped.length == 10)) {
	error = "The phone number is the wrong length. Make sure you included an area code.\n";
    } 
return error;
}


// password - between 6-8 chars, uppercase, lowercase, and numeral

function checkPassword (strng) {
var error = "";
if (strng == "") {
   error = "You didn't enter a password.\n";
}

    var illegalChars = /[\W_]/; // allow only letters and numbers
    
    if ((strng.length < 6) || (strng.length > 8)) {
       error = "Enter Password Of 6 To 8 Length.\n";
    }
    else if (illegalChars.test(strng)) {
      error = "The password contains illegal characters.\n";
    } 
    else if (!((strng.search(/(a-z)+/)) && (strng.search(/(A-Z)+/)) && (strng.search(/(0-9)+/)))) {
       error = "The password must contain at least one uppercase letter, one lowercase letter, and one numeral.\n";
    }  
return error;    
}    


// username - 4-10 chars, uc, lc, and underscore only.

function checkUsername (strng) {
var error = "";
if (strng == "") {
   error = "You didn't enter a username.\n";
}
var illegalChars = /\W/; // allow letters, numbers, and underscores
if ((strng.length < 4) || (strng.length > 10)) {
 error = "The username is the wrong length.\n";
}
else if (illegalChars.test(strng)) {
error = "The username contains illegal characters.\n";
} 
return error;
}       


// non-empty textbox

function isEmpty(strng, fieldname) {
var error = "";
  if (strng.length == 0) {
     error ="Please Enter Value For " + fieldname  + ".\n"
  }
return error;	  
}

// was textbox altered



function isDifferent(strng) {
var error = ""; 
  if (strng != "Can\'t touch this!") {
     error = "You altered the inviolate text area.\n";
  }
return error;
}

// exactly one radio button is chosen

function checkRadio(checkvalue) {
var error = "";
   if (!(checkvalue)) {
       error = "Please check a radio button.\n";
    }
return error;
}

// valid selector from dropdown list

function checkDropdown(choice, fieldname) {
var error = "";
    if (choice == 0) {
    error = "You didn't choose an option from the "+ fieldname + " list.\n";
    }    
return error;
}