// 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 validate_form(theForm) {
    var why = "";
	why += validateEmpty(theForm.fname,"First Name");
	why += validateEmpty(theForm.lname,"Last Name");
	why += validateEmpty(theForm.org,"Organization");
	why += validateEmpty(theForm.address,"Address");
	why += validateEmpty(theForm.city,"City");
	why += checkDropdown(theForm.state.selectedIndex,"State");
	why += validateZIP(theForm.zip.value);
	why += checkPhone(theForm.phone.value);
    why += checkEmail(theForm.email.value);              
	why += checkDropdown(theForm.source.selectedIndex,"Source");
    if (why != "") {
       alert(why);
       return false;
    }
return true;
}


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 = "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 < 1) || (strng.length > 50)) {
       error = "The field name is the wrong length.\n";
    }
    else if (illegalChars.test(strng)) {
    error = "The field contains illegal characters.\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;	  
}

function validateEmpty(strng,name) {
    var error = "";
 
    if (strng.value.length == 0) {
        strng.style.background = 'Yellow'; 
        error = "The required field for "+name+" has not been filled in.\n"
    } else {
        strng.style.background = 'White';
    }
    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,string) {
var error = "";
    if (choice == 0) {
    error = "You didn't choose an option from the " +string+ " drop-down list.\n";
    }    
return error;
}

///test
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";
return error;
}
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";
return error;
}
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;
 }
}
return error;
}