// 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 == "") {
   return false;
}

    var emailFilter=/^.+@.+\..{2,3}$/;
    if (!(emailFilter.test(strng))) { 
			return false;
    }
    else {
//test email for illegal characters
       var illegalChars= /[\(\)\<\>\,\;\:\\\"\[\]]/
         if (strng.match(illegalChars)) {
			 return false;
       }
    }
return true;    
}


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

function checkPhone (strng) {
	if (strng == "") {
	   return false;
	}
	var stripped = strng.replace(/[\(\)\.\-\ ]/g, ''); //strip out acceptable non-numeric characters
		if (isNaN(parseInt(stripped))) {
		   return false;
	  
		}
		if (!(stripped.length == 10)) {
			return false;
		} 
	return true;
}

function checkSocial (strng) {
	if (strng == "") {
	   return false;
	}
	var stripped = strng.replace(/[\(\)\.\-\ ]/g, ''); //strip out acceptable non-numeric characters
		if (isNaN(parseInt(stripped))) {
		   return false;
	  
		}
		if (!(stripped.length == 9)) {
			return false;
		} 
	return true;
}

function checkZip(strng){
	if (strng == "") {
	   return false;
	}
	if (isNaN(parseInt(strng))){
		return false;
	}
	if(!(strng.length == 5)){
		return false;	
	}
	return true;
}

// 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 = "The password is the wrong 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) {
  if (strng.length == 0) {
     return true;
  }
  return false;  
}

// 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) {
   if (!(checkvalue)) { 	
	   return false;
    }
return true;
}

// valid selector from dropdown list

function checkDropdown(choice) {
    if (choice == 0) {
    	return false;
    }    
	return true;
}    // JavaScript Document