// Generic Form Validation
// Jacob Hage (jacob@hage.dk)
var checkObjects	= new Array();
var errors		= "";
var returnVal		= false;
var language		= new Array();
language["header"]	= ""
language["start"]	= "->";
language["field"]	= " Veld ";
language["require"]	= " is verplicht";
language["min"]		= " en moet bestaan uit minstens ";
language["max"]		= " en mag niet meer tekens bevatten dan ";
language["minmax"]	= " en niet meer dan ";
language["chars"]	= " karakters";
language["num"]		= " en moet een getal bevatten";
language["email"]	= " is een ongeldig e-mail address";
language["minval"]		= " en mag niet minder zijn dan ";
language["maxval"]		= " en mag niet meer zijn dan ";
// -----------------------------------------------------------------------------
// define - Call this function in the beginning of the page. I.e. onLoad.
// n = name of the input field (Required)
// type= string, num, email (Required)
// min = the value must have at least [min] characters (Optional)
// max = the value must have maximum [max] characters (Optional)
// d = (Optional)
// -----------------------------------------------------------------------------


function define(n, type, HTMLname, min, max, d) {
	var p;
	var i;
	var x;
	if (!d) d = document;
	if ((p=n.indexOf("?"))>0&&parent.frames.length) {
		d = parent.frames[n.substring(p+1)].document;
		n = n.substring(0,p);
	}
	if (!(x = d[n]) && d.all) x = d.all[n];
	for (i = 0; !x && i < d.forms.length; i++) {
		x = d.forms[i][n];
	}
	for (i = 0; !x && d.layers && i < d.layers.length; i++) {
		x = define(n, type, HTMLname, min, max, d.layers[i].document);
		return x;       
	}
	eval("V_"+n+" = new formResult(x, type, HTMLname, min, max);");
	checkObjects[eval(checkObjects.length)] = eval("V_"+n);
}
function undefine(n) {
	for (i = 0; i < checkObjects.length; i++) {
		if(checkObjects[i].form.name == n) {
			var newArr = new Array();
			var tel = 0;
			for (j = 0; j < checkObjects.length; j++) {
				if(i!=j) {
					newArr[tel] = checkObjects[j];
					tel++;
				}
			}
			checkObjects = newArr;
			i=0;
		}
	}
}
function formResult(form, type, HTMLname, min, max) {
	this.form = form;
	this.type = type;
	this.HTMLname = HTMLname;
	this.min  = min;
	this.max  = max;
}
function validate() {
	if (checkObjects.length > 0) {
		errorObject = "";
		for (i = 0; i < checkObjects.length; i++) {
			validateObject = new Object();
			validateObject.form = checkObjects[i].form;
			validateObject.HTMLname = checkObjects[i].HTMLname;
			validateObject.type = checkObjects[i].type;
			if (validateObject.type == "num" || validateObject.type == "string" || validateObject.type == "email" || validateObject.type == "numval") {
				validateObject.val = checkObjects[i].form.value;
				validateObject.len = checkObjects[i].form.value.length;
				validateObject.min = checkObjects[i].min;
				validateObject.max = checkObjects[i].max;
				if (validateObject.type == "num" || validateObject.type == "string") {
					if ((validateObject.type == "num" && validateObject.len <= 0) || (validateObject.type == "num" && isNaN(validateObject.val))) { errors += language['start'] + language['field'] + validateObject.HTMLname + language['require'] + language['num'] + "\n";}
					else if (validateObject.min && validateObject.max && (validateObject.len < validateObject.min || validateObject.len > validateObject.max)) { errors += language['start'] + language['field'] + validateObject.HTMLname + language['require'] + language['min'] + validateObject.min + language['minmax'] + validateObject.max+language['chars'] + "\n";}
					else if (validateObject.min && !validateObject.max && (validateObject.len < validateObject.min)) { errors += language['start'] + language['field'] + validateObject.HTMLname + language['require'] + language['min'] + validateObject.min + language['chars'] + "\n";}
					else if (validateObject.max && !validateObject.min &&(validateObject.len > validateObject.max)) { errors += language['start'] + language['field'] + validateObject.HTMLname + language['require'] + language['max'] + validateObject.max + language['chars'] + "\n";}
					else if (!validateObject.min && !validateObject.max && validateObject.len <= 0) { errors += language['start'] + language['field'] + validateObject.HTMLname + language['require'] + "\n";}				
				} else if(validateObject.type == "email") {
					// Checking existense of "@" and ".". 
					// Length of must >= 5 and the "." must 
					// not directly precede or follow the "@"
					if ((validateObject.val.indexOf("@") == -1) || (validateObject.val.charAt(0) == ".") || (validateObject.val.charAt(0) == "@") || (validateObject.len < 6) || (validateObject.val.indexOf(".") == -1) || (validateObject.val.charAt(validateObject.val.indexOf("@")+1) == ".") || (validateObject.val.charAt(validateObject.val.indexOf("@")-1) == ".")) { errors += language['start'] + language['field'] + validateObject.HTMLname + language['email'] + "\n"; }
				} else if(validateObject.type == "numval") {
					// Checking if val is between the min and max
					if (isNaN(validateObject.val) || trim(validateObject.val)=="") { errors += language['start'] + language['field'] + validateObject.HTMLname + language['require'] + language['num'] + "\n"; }
					else {
						if(parseInt(validateObject.val)<validateObject.min || parseInt(validateObject.val)>validateObject.max) errors += language['start'] + language['field'] + validateObject.HTMLname + language['require'] + language['num'];
						if(parseInt(validateObject.val)<validateObject.min) { errors += " " + language['minval'] + validateObject.min; }
						if(parseInt(validateObject.val)>validateObject.max) { errors += " " + language['maxval'] + validateObject.max; }
						if(parseInt(validateObject.val)<validateObject.min || parseInt(validateObject.val)>validateObject.max) errors += "\n";
					}
				}
      		} else if(validateObject.type == "checked"){
				validateObject.checked = checkObjects[i].form.checked;
	  			if (!validateObject.checked){ errors += language['start'] + language['field'] + validateObject.HTMLname + language['require'] + "\n"; }
	  		}
			 else if(validateObject.type == "radio") {
				//nieuw stuk voor radio buttons
				if (valButton(validateObject.form)==null) { errors += language['start'] + language['field'] + validateObject.HTMLname + language['require'] + "\n";}	
			}
   		}
	}
	if (errors) {
		alert(language["header"].concat("\n" + errors));
		errors = "";
		returnVal = false;
	} else {
		returnVal = true;
	}
}
function valButton(btn) {
	var cnt = -1;
	for (var i=0; i < btn.length; i++) {
		if (btn[i].checked) {cnt = i; i = btn.length;}
	}
	if (cnt > -1) return btn[cnt].value;
	else return null;
}
function trim(value) {
  value = value.replace(/^\s+/,''); 
  value = value.replace(/\s+$/,'');
  return value;
}