// 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 = "Please enter a valid 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;    
}

// age

function checkAge (strng) {
var error="";
if (strng == "") {
   error = "You didn't enter an age.\n";
}

    if (parseInt(strng) < 13) {
       error = "You must be at least 13 years old to use this service.\n";
    }
return error;    
}

// Name check uc, lc, and underscore only.

function checkName (strng, pos) {
var error = "";
if (strng == "") {
   error = "Please enter your " + pos + " name.\n";
}

//    var illegalChars = /\w+/; // allow letters, numbers, and underscores
//    if (!(strng.search(/[a-zA-Z0-9_]+(-[a-zA-Z0-9_]+)*/))) {
//    error = "The " + pos + " name contains illegal characters.\n";
//    } 
return error;
}       



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

function checkPhone (strng) {
	var error = "";
	if (strng != "") {
/* 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, strng2) {
var error = "";
if (strng == "") {
	error = "Please enter a password.\n";
}
else {
    var illegalChars = /[\W_]/; // allow only letters and numbers
    
/*    if ((strng.length < 6) || (strng.length > 8)) { */
   if (strng.length < 6) {
       error = "The password must contain at least 6 characters.\n";
    }
    else if (illegalChars.test(strng)) {
      error = "The password contains illegal characters.\n";
    } 
    else if (!(strng == strng2)) {
    	error = "The passwords don't match.\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;
}       


// address

function checkAddress (strng) {
var error = "";
if (strng == "") {
   error = "You didn't enter an address.\n";
}
return error;

}

// zipcode

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

}

// confirm

function checkConfirm (strng) {
var error = "";
if (!(strng)) {
   error = "You must agree to the terms and conditions to register.\n";
}
return error;

}

// non-empty textbox

function isEmpty(strng) {
var error = "";
  if (strng.length == 0) {
     error = "The mandatory text area has not been filled in.\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 indicate your gender.\n";
    }
return error;
}

// valid selector from dropdown list

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


function checkWholeForm(cheese) {
	var why = "";
	why += checkName(cheese.f_name.value, "first");
	why += checkName(cheese.l_name.value, "last");
	why += checkEmail(cheese.email.value);
	if (why != "") {
	   alert(why);
	   return false;
	}
return true;
}