// 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 = "- 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 < 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 isEmptyFName(strng) {
var error = "";
  if (strng.length == 0) {
     error = "- Please enter your first name.\n"
  }
return error;	  
}

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

function isEmptyDepartureDate(strng) {
var error = "";
  if (strng.length == 0) {
     error = "- Please enter a departure date.\n"
  }
return error;	  
}

function isEmptyFrom(strng) {
var error = "";
  if (strng.length == 0) {
     error = "- Please enter a starting location in the \"From\" field.\n"
  }
return error;	  
}

function isEmptyTo(strng) {
var error = "";
  if (strng.length == 0) {
     error = "- Please enter a destination in the \"To\" field.\n"
  }
return error;	  
}

function isEmptyNotes(strng) {
var error = "";
  if (strng.length == 0) {
     error = "- Please complete the \"Detailed Notes\" field.\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 (choice == 0) {
		error = "- Please select a school district.\n";
	}
return error;
}

// valid selector from dropdown list

function checkSchool(choice, alternate) {
var error = "";
	if (choice == 0) {
		error = "- Please select a school.\n";
	}
return error;
}