LPMJ Example 17-2

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<script>
function validateForename(field) {
	if (field == "") return "No Forename was entered.\n"
	return ""
}

function validateSurname(field) {
	if (field == "") return "No Surname was entered.\n"
	return ""
}

function validateUsername(field) {
	if (field == "") return "No Username was entered.\n"
	else if (field.length < 5)
		return "Usernames must be at least 5 characters.\n"
	else if (/[^a-zA-Z0-9_-]/.test(field))
		return "Only a-z, A-Z, 0-9, - and _ allowed in Usernames.\n"
	return ""
}

function validatePassword(field) {
	if (field == "") return "No Password was entered.\n"
	else if (field.length < 6)
		return "Passwords must be at least 6 characters.\n"
	else if (! /[a-z]/.test(field) ||
			 ! /[A-Z]/.test(field) ||
		     ! /[0-9]/.test(field))
		return "Passwords require one each of a-z, A-Z and 0-9.\n"
	return ""
}

function validateAge(field) {
	if (isNAN(field)) return "No Age was entered.\n"
	else if (field < 18 || field > 110)
		return "Age must be between 18 and 110.\n"
	return ""
}

function validateEmail(field) {
	if (field == "") return "No Email was entered.\n"
		else if (!((field.indexOf(".") > 0) &&
			       (field.indexOf("@") > 0)) ||
			       /[^a-zA-Z0-9.@_-]/.test(field))
		return "The Email address is invalid.\n"
	return ""
}
</script></body></html>