// Generic Form Validation
// Jacob Hage (jacob@hage.dk)
var checkObjects	= new Array();
var errors		= "";
var returnVal		= false;
var language		= new Array();
language["header"]	= "V následujícich položkách jsou chybné údaje:"
language["start"]	= "-";
language["field"]	= " ";
language["require"]	= " je povinné";
language["min"]		= " a musí obsahovat alespoň ";
language["max"]		= " a nesmí obsahovat více než ";
language["minmax"]	= " a ne více než ";
language["chars"]	= " znaků";
language["num"]		= " musí být číslo";
language["email"]	= " musí obsahovat správnou email adresu";
language["check"]	= " musí být označené";

// -----------------------------------------------------------------------------
// 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 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.val = checkObjects[i].form.value;
			validateObject.checked = checkObjects[i].form.checked;
			validateObject.len = checkObjects[i].form.value.length;
			validateObject.min = checkObjects[i].min;
			validateObject.max = checkObjects[i].max;
			validateObject.type = checkObjects[i].type;
			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 == "check") {
				if (!validateObject.checked) { 
					errors += language['start'] + language['field'] + validateObject.HTMLname + language['check'] + "\n"; 
				}
    	}
   	}
	}
	if (errors) {
		//modification jm LND -- removing duplicit entries from string "errors"
		temp = errors.split("\n");
		rem_duplicit = [];
		for (i in temp){
			duplicit = false;
			for (j in rem_duplicit){
				if (rem_duplicit[j] == temp[i]){
					duplicit = true;
					break;
				}
			}
			if (!duplicit) rem_duplicit.push(temp[i]);
		}
		errors = rem_duplicit.join("\n");
		//----------------
		alert(language["header"].concat("\n" + errors));
		errors = "";
		returnVal = false;
	} 
	else {
		returnVal = true;
  }
}