// 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 checkToEmail(strng) {
var error="";
if (strng == "") {
   error = "– You didn't enter the recipient's email address.\n";
}
    var emailFilter=/^.+@.+\..{2,3}$/;
    if (!(emailFilter.test(strng))) { 
       error = "– Please enter a valid recipient email address.\n";
    }
    else {
//test email for illegal characters
	var illegalChars= /[\(\)\<\>\;\:\\\"\[\]]/
	if (strng.match(illegalChars)) {
		error = "– The recipient's email address contains illegal characters.\n";
	}
}
return error;    
}

function checkFromEmail (strng) {
var error="";
if (strng == "") {
   error = "– You didn't enter your email address.\n";
}
    var emailFilter=/^.+@.+\..{2,3}$/;
    if (!(emailFilter.test(strng))) { 
       error = "– Please enter your email address.\n";
    }
    else {
//test email for illegal characters
	var illegalChars= /[\(\)\<\>\,\;\:\\\"\[\]]/
	if (strng.match(illegalChars)) {
		error = "– Your 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 = "– Please 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 < 7) || (stripped.length > 10)) {
	error = "– The phone number is not a valid length.\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 < 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) {
var error = "";
  if (strng.length == 0) {
     error = "– The mandatory text area has not been filled in.\n"
  }
return error;	  
}

function isEmptyName(strng) {
var error = "";
  if (strng.length == 0) {
     error = "– Please enter your name.\n"
  }
return error;	  
}

function isEmptyStreetAddress(strng) {
var error = "";
  if (strng.length == 0) {
     error = "– Please enter a street address.\n"
  }
return error;	  
}

function isEmptyCity(strng) {
var error = "";
  if (strng.length == 0) {
     error = "– Please enter a city.\n"
  }
return error;	  
}

function isEmptyZipCode(strng) {
var error = "";
  if (strng.length == 0) {
     error = "– Please enter a zip code.\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) {
var error = "";
    if (choice == 0) {
    	error = "– You didn't choose an option from the drop-down list.\n";
    }    
return error;
}

// valid selector from dropdown list

function checkDistrict(choice, alternate) {
var error = "";
	if (alternate == null || alternate == "") {
		if (choice == 0) {
			error = "– Please select a School District.\n";
		}
	}
return error;
}

// valid selector from dropdown list

function checkSchool(choice, alternate) {
var error = "";
	if (alternate == null || alternate == "") {
		if (choice == 0) {
			error = "– Please select a School.\n";
		}
	}
return error;
}