// JavaScript file to validate library application

function VerifyOnlineLibraryApplication()
{
	// First Name
	if (document.forms[0].strName.value == '') {
		alert("Please enter your first name.");
		document.forms[0].strName.focus();
		return false;
	}

	var valid_Name = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ -"
	var ok_Name = "yes";
	var temp;
	for (var i=0; i<document.forms[0].strName.value.length; i++) {
		temp = "" + document.forms[0].strName.value.substring(i, i+1);
		if (valid_Name.indexOf(temp) == "-1") {
			ok_Name = "no";
		}
	}
	if (ok_Name == "no") {
		alert("Your first name must not contain any space, number or special characters.");
		document.forms[0].strName.focus();
		document.forms[0].strName.select();
		return false;
	}


	// Email
	if (document.forms[0].strEmail.value == '') {
		alert("Please enter your email address.");
		document.forms[0].strEmail.focus();
		return false;
	}
	else { // check valid input
	    if (!emailCheck(document.forms[0].strEmail.value)) {
			document.forms[0].strEmail.focus();
			return false;
		}
	}
	
	if (document.forms[0].strMobileNo.value == '') {
		alert("Please enter your first name.");
		document.forms[0].strMobileNo.focus();
		return false;
	}
	
	var valid_No = "+1234567890 -"
	var ok_No = "yes";
	var temp2;
	for (var i=0; i<document.forms[0].strMobileNo.value.length; i++) {
		temp2 = "" + document.forms[0].strMobileNo.value.substring(i, i+1);
		if (valid_No.indexOf(temp2) == "-1") {
			ok_No = "no";
		}
	}
	if (ok_No == "no") {
		alert("You must only insert number. Please re-insert.");
		document.forms[0].strMobileNo.focus();
		document.forms[0].strMobileNo.select();
		return false;
	}
	
	// Subject
//	if (!document.forms[0].chkEDUK.checked) || (!document.forms[0].chkArts.checked) || (!document.forms[0].chkScience.checked) || (!document.forms[0].chkTeachCentre.checked) || (!document.forms[0].chkExam.checked) || (!document.forms[0].chkWebsite.checked) || (!document.forms[0].chkLibrary.checked) || (!document.forms[0].chkGeneralCS.checked) {
	if (!document.forms[0].chkEDUK.checked && !document.forms[0].chkArts.checked && !document.forms[0].chkScience.checked && !document.forms[0].chkTeachCentre.checked && !document.forms[0].chkExam.checked && !document.forms[0].chkWebsite.checked && !document.forms[0].chkLibrary.checked && !document.forms[0].chkGeneralCS.checked ) {
		alert("You have not selected any Subject of comment or complaint. Please select atleast one.")
		document.forms[0].chkEDUK.focus();
		return false
	}
	
	//Comment
	if (document.forms[0].strComment.value == '') {
		alert("Please enter your comments.");
		document.forms[0].strComment.focus();
		return false;
	}

	return true
}

function emailCheck(emailStr) 
{
	/* The following pattern is used to check if the entered e-mail address
	fits the user@domain format.  It also is used to separate the username
	from the domain. */
	var emailPat=/^(.+)@(.+)$/
	/* The following string represents the pattern for matching all special
	characters.  We don't want to allow special characters in the address. 
	These characters include ( ) < > @ , ; : \ " . [ ]    */
	var specialChars="\\(\\)<>@,;:\\\\\\\"\\.\\[\\]"
	/* The following string represents the range of characters allowed in a 
	username or domainname.  It really states which chars aren't allowed. */
	var validChars="\[^\\s" + specialChars + "\]"
	/* The following pattern applies if the "user" is a quoted string (in
	which case, there are no rules about which characters are allowed
	and which aren't; anything goes).  E.g. "jiminy cricket"@disney.com
	is a legal e-mail address. */
	var quotedUser="(\"[^\"]*\")"
	/* The following pattern applies for domains that are IP addresses,
	rather than symbolic names.  E.g. joe@[123.124.233.4] is a legal
	e-mail address. NOTE: The square brackets are required. */
	var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/
	/* The following string represents an atom (basically a series of
	non-special characters.) */
	var atom=validChars + '+'
	/* The following string represents one word in the typical username.
	For example, in john.doe@somewhere.com, john and doe are words.
	Basically, a word is either an atom or quoted string. */
	var word="(" + atom + "|" + quotedUser + ")"
	// The following pattern describes the structure of the user
	var userPat=new RegExp("^" + word + "(\\." + word + ")*$")
	/* The following pattern describes the structure of a normal symbolic
	domain, as opposed to ipDomainPat, shown above. */
	var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$")


	/* Finally, let's start trying to figure out if the supplied address is valid. */

	/* Begin with the coarse pattern to simply break up user@domain into
	different pieces that are easy to analyze. */
	var matchArray=emailStr.match(emailPat)
	if (matchArray==null) {
		/* Too many/few @'s or something; basically, this address doesn't
		even fit the general mould of a valid e-mail address. */
		alert("Email address seems incorrect (check @ and .'s)")
		return false
	}
	var user=matchArray[1]
	var domain=matchArray[2]

	// See if "user" is valid 
	if (user.match(userPat)==null) {
		// user is not valid
		alert("The username doesn't seem to be valid.")
		return false
	}

	/* if the e-mail address is at an IP address (as opposed to a symbolic
	host name) make sure the IP address is valid. */
	var IPArray=domain.match(ipDomainPat)
	if (IPArray!=null) {
		// this is an IP address
		for (var i=1;i<=4;i++) {
			if (IPArray[i]>255) {
				alert("Destination IP address is invalid!")
				return false
			}
		}
		return true
	}

	// Domain is symbolic name
	var domainArray=domain.match(domainPat)
	if (domainArray==null) {
		alert("The domain name doesn't seem to be valid.")
		return false
	}

	/* domain name seems valid, but now make sure that it ends in a
	three-letter word (like com, edu, gov) or a two-letter word,
	representing country (uk, nl), and that there's a hostname preceding 
	the domain or country. */

	/* Now we need to break up the domain to get a count of how many atoms
   it consists of. */
	var atomPat=new RegExp(atom,"g")
	var domArr=domain.match(atomPat)
	var len=domArr.length
	if (domArr[domArr.length-1].length<2 || domArr[domArr.length-1].length>3) {
		// the address must end in a two letter or three letter word.
		alert("The address must end in a three-letter domain, or two letter country.")
		return false
	}

	// Make sure there's a host name preceding the domain.
	if (len<2) {
		var errStr="This address is missing a hostname!"
		alert(errStr)
		return false
	}

	// If we've gotten this far, everything's valid!
	return true;
}