// Name   : emptyFieldChecker (v1.1)
// Args   : none
// Desc   : This JavaScript object checks for empty fields in a form.
// Author : Gerrie Kimpen (c) Katholieke Hogeschool Kempen - 1999
//
// Current update : v1.1
// Updated		  : 06/04/2001
// Updated by	  : Kurt De Wit (c) Porta Capena - 2001
////////////////////////////////////////////////////////////////////////////////

function doAddRadioButton(name, errorMsg) {
	if (this.emptyFieldDetected) return;
	var radioObject = this.theForm.elements[name], i;
	if (radioObject.length){
		for (i = 0; i < radioObject.length; i++)
			if (radioObject[i].checked) break;
		this.emptyFieldDetected = !(i < radioObject.length);
	}
	else this.emptyFieldDetected = !(radioObject.checked);
	if (this.emptyFieldDetected) alert(errorMsg);
}

function doAddCheckBox(name, errorMsg) {
	if (this.emptyFieldDetected) return;
	var checkBoxObject = this.theForm.elements[name], i;
	if (checkBoxObject.length){
		for (i = 0; i < checkBoxObject.length; i++)
			if (checkBoxObject[i].checked) break;
		this.emptyFieldDetected = !(i < checkBoxObject.length);
	}
	else this.emptyFieldDetected = !(checkBoxObject.checked);
	if (this.emptyFieldDetected) alert(errorMsg);
}

function doAddListBox(name, errorMsg) {
	if (this.emptyFieldDetected) return;
	var listBoxObject = this.theForm.elements[name], i;
	for (i = 0; i < listBoxObject.length; i++)
		if (listBoxObject.options[i].selected) break;
	this.emptyFieldDetected = !(i < listBoxObject.length);
	if (this.emptyFieldDetected) alert(errorMsg);
}

function doAddTextField(name, errorMsg) {
	if (this.emptyFieldDetected) return;
	var textObject = this.theForm.elements[name];
	this.emptyFieldDetected = (textObject.value == "");
	if (this.emptyFieldDetected) 
		{
			alert(errorMsg);
			textObject.focus();
		}
}

function doCheckForm() {
	if (this.emptyFieldDetected) {
		this.emptyFieldDetected = false; // set back to false
		return false; }
	else {
		this.emptyFieldDetected = false; // set back to false
		return true; }
}

//--------------------------------------------------------------
//Features added in v 1.1.
//--------------------------------------------------------------
function doCheckAlfaField(name, errorMsg){
	//Check if the input consists out of characters only.
	if (this.emptyFieldDetected) return;
	var textObject = this.theForm.elements[name];
	var strText = textObject.value.toLowerCase();
	if(textObject.value == ""){
		this.emptyFieldDetected = true;
	}else{
		for(i = 0 ; i < strText.length ; i++){
			if(((strText.charCodeAt(i) < 97) && (strText.charCodeAt(i) != 32)) | ((strText.charCodeAt(i) > 122) && (strText.charCodeAt(i) != 235))){
				this.emptyFieldDetected = true;
				break;
			}else{
				this.emptyFieldDetected = false;
			}
		}
	}
	if (this.emptyFieldDetected) alert(errorMsg);
}

function doCheckNumField(name, errorMsg){
	//Check if the input consists out of numbers only.
	if (this.emptyFieldDetected) return;
	var textObject = this.theForm.elements[name];
	var strText = textObject.value.toLowerCase();
	if(textObject.value == ""){
		this.emptyFieldDetected = true;
	}else{
		for(i = 0 ; i < strText.length ; i++){
			if((strText.charCodeAt(i) < 48) | (strText.charCodeAt(i) > 57)){
				this.emptyFieldDetected = true;
				break;
			}else{
				this.emptyFieldDetected = false;
			}
		}
	}
	if (this.emptyFieldDetected) alert(errorMsg);
}

function doCheckAlfaNumField(name, errorMsg){
	//Check if the input can be an e-mailadres.
    if (this.emptyFieldDetected) return;
	var textObject = this.theForm.elements[name];
	if(textObject.value == ""){
		this.emptyFieldDetected = true;
	}else{
		var strText = textObject.value.toLowerCase();
		for(i = 0 ; i < strText.length ; i++){		
			if(((strText.charCodeAt(i) >= 97) & (strText.charCodeAt(i) <= 122)) | 
			   ((strText.charCodeAt(i) >= 48) & (strText.charCodeAt(i) <= 57)) |	
				(strText.charCodeAt(i) == 32)){
					this.emptyFieldDetected = false;
			}else{
					this.emptyFieldDetected = true;
			}
		}
	}
	if (this.emptyFieldDetected) alert(errorMsg);
}

function doCheckPhoneField(name, errorMsg){
	//Check if the input consists out of numbers only.
	if (this.emptyFieldDetected) return;
	var textObject = this.theForm.elements[name];
	if(textObject.value == ""){
		this.emptyFieldDetected = true;
	}else{
		var strText = textObject.value.toLowerCase();
		var c1 = 0;
		var c2 = 0;
		
		if(strText.charCodeAt(0) == 43){
			//International phonenumber entered.
			for(i = 1 ; i < strText.length ; i++){
				if(strText.charCodeAt(i) == 40){c1++;}
				if(strText.charCodeAt(i) == 41){c2++;}
			}
			
			if((c1 == 1) & (c2 == 1)){
				for(i = 1 ; i < strText.length ; i++){				
					if(((strText.charCodeAt(i) >= 48) & (strText.charCodeAt(i) <= 57)) | (strText.charCodeAt(i) != 40) | (strText.charCodeAt(i) != 41)){
						this.emptyFieldDetected = false;
					}else{
						this.emptyFieldDetected = true;
						break;
					}
				}
			}else{
				this.emptyFieldDetected = true;
			}
		}else{
			//National phonenumber entered.
			for(i = 0 ; i < strText.length ; i++){
				if(((strText.charCodeAt(i) < 46) && (strText.charCodeAt(i) != 32)) | (strText.charCodeAt(i) > 57)){
					this.emptyFieldDetected = true;
					break;
				}else{
					this.emptyFieldDetected = false;
				}
			}
		}
	}
	if (this.emptyFieldDetected) alert(errorMsg);
}

function doCheckMailField(name, errorMsg){
    if (this.emptyFieldDetected) return;
	var textObject = this.theForm.elements[name];
	if(emailCheck(textObject.value)){
		this.emptyFieldDetected = false;
	}else{
		alert(errorMsg);
		this.emptyFieldDetected = 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;
}

//--------------------------------------------------------------

function emptyFieldChecker(formToCheck) {
	// properties
	this.theForm = formToCheck;
	this.emptyFieldDetected = false;
	//methods
	this.addTextField	= doAddTextField;
	this.addListBox		= doAddListBox;
	this.addCheckBox	= doAddCheckBox;
	this.addRadioButton	= doAddRadioButton;
	this.checkForm		= doCheckForm;
	this.addAlfaField	= doCheckAlfaField;
	this.addNumField	= doCheckNumField;
	this.addAlfaNumField= doCheckAlfaNumField;
	this.addMailField	= doCheckMailField;
	this.addPhoneField  = doCheckPhoneField;
}