// 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 email address.\n";
	} else {
		//test email for illegal characters
		var illegalChars= /[\(\)\<\>\,\;\:\\\"\[\]]/;
		if (strng.match(illegalChars)) {
			error = "The email address contains illegal characters.\n";
		} else {
			var emailFilter=/^.+@.+\..{2,3}$/;
			if (!(emailFilter.test(strng))) {
				error = "Please enter a valid email address.\n";
			}
		}
	}
	return error;    
}

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

function checkPhone (strng) {
	var error = "";
	var stripped = strng.replace(/[x\(\)\.\-\ ]/g, ''); //strip out acceptable non-numeric characters
	if (strng == "" || stripped == "") {
		error = "Please enter Phone Number.\n";
	} else {
		if (isNaN(parseInt(stripped))) {
			error = "The phone number contains illegal characters.\n";
		} else if (stripped.length < 7) {
			error = "Please enter a valid phone number (length is too short).\n";
		}
	}
	return error;
}


// password - between 6-8 chars, uppercase, lowercase, and numeral

function checkPassword (strng) {
	var error = "";
	if (strng == "") {
		error = "Please enter 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 = "Please enter 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, field)
{
	return isEmptyRefined(1, strng, field);   
}

function isEmptyRefined(minLength, value, field)
{
	var error = "";
	
	if (value.length < minLength)
	{
		error = "Please enter " + 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, field) {
	var error = "";
	if (!(checkvalue)) {
		error = "Please check " + field + ".\n";
	}
	return error;
}

// valid selector from dropdown list

function checkDropdown(element, field) {
	var error = "";
	if ((element.disabled == false) && (element.value == 0)) {
		error = "Please select " + field + ".\n";
	}
	return error;
}