// 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 checkEml (strng, tid) {
var error="";
if (strng == "") {
   error = "You didn't enter an email address.\n";
}

    var emailFilter=/^.+@.+\..{2,3}$/;
    if (!(emailFilter.test(strng))) { 
       error = strng + " is not a valid email address.\n";
	   alert(error);
    }
    else {
	//test email for illegal characters
       var illegalChars= /[\(\)\<\>\,\;\:\\\"\[\]]/
         if (strng.match(illegalChars)) {
          error = "The email address contains illegal characters.\n";
       }
    }

	if (error == "") {
		return true;
	} else {
		return false;
	}
}


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

function checkPhone (strng, tid) {
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";
    } 
	
	if (error == "") {
		return true;
	} else {
		return false;
	}
}


// password - between 6-14 chars, uppercase, lowercase, and numeral

function checkPassword (strng, tid) {
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 > 14)) {
       error = "The password must be 6 to 14 characters.\n";
    }
    else if (illegalChars.test(strng)) {
      error = "The password can be only letters and numbers.\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";
    //}  
	if (error == "") {
		return true;
	} else {
		return false;
	}
}    


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

function checkName (strng, tid, first_or_last) {
var error = "";
if (strng == "") {
   error = "You didn't enter a " + first_or_last + " Name.\n";
}
var strng = strng.replace(/'/g, ''); //strip out any single quotes
		strng = strng.replace(/\s/g, ''); //strip out any spaces
    var illegalChars = /[\W_\d]/; // allow letters only
    if ((strng.length > 25)) {
       error = "Your name is too long.\n";
    }
    else if (illegalChars.test(strng)) {
    	error = "The name field may contain letters only.\n";
    } 
	if (error == "") {
		return true;
	} else {
		return false;
	}
}

//letters, spaces, ampersands, single quotes and dashes only

function checkString (strng, tid) {
var error = "";
if (strng == "") {
   error = "You didn't enter a Name.\n";
}
strng = strng.replace(/'/g, ''); //strip out any single quotes
strng = strng.replace(/\s/g, ''); //strip out any spaces
strng = strng.replace(/-/g, ''); //strip out any dashes
strng = strng.replace(/&/g, ''); //strip out any ampersands
    var illegalChars = /[\W_\d]/; // allow letters only
    if ((strng.length > 25)) {
       error = "Your name is too long.\n";
    }
    else if (illegalChars.test(strng)) {
    	error = "The username contains illegal characters.\n";
    } 
	if (error == "") {
		return true;
	} else {
		return false;
	}
}


// non-empty textbox

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