// 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 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;    
}

function checkMySpaceURL (strng, name){
	var error = "";
	var illegalChars = /\W/; // allow only letters and numbers
	
	if (strng.length > 0) {
		if (illegalChars.test(strng)) {
      		error = "Your \""+name+"\" can only contain letters and numbers.  REMEMBER, don't include, \"http://www.myspace.com/\".\n";
   	 	}
	}
	return error;
}


// check emails match

function doEmailsMatch(emailA, emailB) {
var error = "";
  if(emailA.toLowerCase() != emailB.toLowerCase()) {
  	error = "Email addresses do not match.\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 < 4) || (strng.length > 10)) {
       error = "The password is the wrong length.  Password must be between 4 and 10 characters long.\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;    
}    

// do passwords match
function doPasswordsMatch(passA, passB) {
var error = "";
  if(passA != passB) {
  	error = "Passwords do not match.\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, label) {
var error = "";
  if (strng.length == 0) {
     error = label + " is required.\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, label) {
var error = "";
    if (choice == 0) {
   		error = "You didn't choose an option from the "+label+" drop-down list.\n";
    }    
return error;
}

// checkbox was checked

function checkCheckbox(chk, title) {
var error = "";
  if (chk == 0) {
  	  error = title + "\n"; 
  }
return error;
}

//  check for valid numeric strings	
function isNumeric(strng, label, isReq) {
   var error = "";
   var strValidChars = "0123456789.-";
   var strChar;
   
   if (strng.length == 0 && isReq == 1) {
		error = label + " is required.\n";   
   } else if (strng.length > 0) {
   		//  test strString consists of valid characters listed above
   		for (i = 0; i < strng.length; i++) {
      		strChar = strng.charAt(i);
      		if (strValidChars.indexOf(strChar) == -1) {
		 		error = label + " can only contain NUMERIC data.\n";
      		}
   		}
   }
return error;
}

function validateZIP(field) {
	var error = "";
	var valid = "0123456789-";
	var hyphencount = 0;

	if (field.length!=5 && field.length!=10) {
		error = "Please enter your 5 digit or 5 digit+4 zip code.\n";
	}
	for (var i=0; i < field.length; i++) {
		temp = "" + field.substring(i, i+1);
		if (temp == "-") hyphencount++;
		if (valid.indexOf(temp) == "-1") {
			error = "Invalid characters in your zip code.  Please try again.\n";
		}
		if ((hyphencount > 1) || ((field.length==10) && ""+field.charAt(5)!="-")) {
			error = "The hyphen character should be used with a properly formatted 5 digit+four zip code, like '12345-6789'.   Please try again.\n";
   		}
	}
return error;
}

// Check age
function fixDate(date) {
  var base = new Date(0);
  var skew = base.getTime();
  if (skew > 0) { date.setTime(date.getTime() - skew); }
}

// determine age
function howOld(day,month,year) {
	var error = "";
	
    var c = new Date(); // a new instance
    fixDate(c);

    var thisDay = c.getDate();
    var thisMonth = c.getMonth() + 1;
    var thisYear = c.getFullYear();

    var yearsold = thisYear - year; 
    var monthsold = 0;
    var daysold = 0;
    var age = '';

    if (thisMonth >= month) {
      monthsold = thisMonth - month;
    }
    else {
      yearsold--;
      monthsold = thisMonth + 12 - month;
    }

    if (thisDay >= day) {
     daysold = thisDay - day;
    }
    else {
        if (monthsold > 0) {
          monthsold--;
        }
        else {
          yearsold--;
          monthsold += 11;
        }
        daysold = thisDay + 31 - day;
    }

    if (yearsold < 0) return '';

    if ((yearsold == 0) && (monthsold == 0) && (daysold == 0)) return '';

    if (yearsold > 0) {
        age = yearsold;
        if (yearsold > 1) age;
        age += ' ';
    }
	
	return age;
}