/*********************************************************************************/
/* Constructor of main Form Validator Class

/*********************************************************************************/
function ValForm(formname){
	this.objForm= document.forms[formname];
	this.add	= AddFormValidation;
	this.validate	= ValidateForm;
}


/*********************************************************************************/
/* Constructor of ITem Class under main Form Validator class
/*********************************************************************************/
function ValItem(){
	this.vSet=new Array();
	this.add=AddItemValidation;
}



/*********************************************************************************/
/* Add New Validation Constraint to Main Form Validation Class
/*********************************************************************************/
function AddFormValidation(itemname,validationType,errormsg,extradata){
	objItem = this.objForm[itemname];
	if(!objItem){
		alert("Unable to Add the Item (" + itemname +  ") in Form Validator.")
		return;
	}
	
	if(!objItem.Validator){
		objItem.Validator=new ValItem();
		objItem.validateMe=ValidateItem;		
	}
	
	objItem.Validator.add (validationType,errormsg,extradata);
}



/*********************************************************************************/
/* Add New Validation Constraint to ITem Class under main Form Validator class
/*********************************************************************************/
function AddItemValidation(validationType,errormsg,extradata){
	this.vSet[this.vSet.length]=new Array(validationType,errormsg,extradata)
}






function ValidateForm(){
	for(i=0;i<this.objForm.elements.length;i++){
		if (this.objForm.elements[i].Validator) {
			for(j=0;j<this.objForm.elements[i].Validator.vSet.length;j++){
				if (!this.objForm.elements[i].validateMe(j))	return false;			
			}
		}
	}
}


function ValidateItem(index){
	if (this.Validator.vSet.length<index || index<=-1) return false;
	
	var item			=this;
	var ValidationType	=this.Validator.vSet[index][0];
	var ErrorMSg		=this.Validator.vSet[index][1];	
	var ExtraData		=this.Validator.vSet[index][2];
	
	
	var re;
	
	switch (ValidationType){		
		case 'Required':  
						if (item.value=="" || item.value.length==0 || item.value==null) {
							alert(ErrorMSg);
							return false;
						}
						break;
			
		case 'MaxLen'	:
						if (item.value.length>ExtraData) {
							alert(ErrorMSg);
							return false;
						}
						break;
					
		case 'MinLen'	:
						if (item.value.length<ExtraData) {
							alert(ErrorMSg);
							return false;
						}
						break;
		case 'Email'		:
						/*re = new RegExp(/^([a-zA-Z0-9_\.\-])+\@([a-zA-Z0-9\-]+\.)+([a-zA-Z0-9]{2,4})+$/);
						if (!re.test(item.value)) {
							alert(ErrorMSg);
							return false;
						}*/
						if (!emailvalidate(item.value)) {
							alert(ErrorMSg);
							return false;
						}
						break;
		case 'Password'		:
						re = new RegExp(/([\s\t])+/);
						if (re.test(item.value)) {
							alert(ErrorMSg);
							return false;
						}
						
						break;
		case 'Checked'	:
						if (!item.checked) {
							alert(ErrorMSg);
							return false;
						}
						break;
		case 'Date'	:
						if (!isDate(item.value,ExtraData)) {
							alert(ErrorMSg);
							return false;
						}
						break;
		case 'Numeric'	:
						if (!isInteger(item.value)) {
							alert(ErrorMSg);
							return false;
						}
						break;
	}
	return true;
}


/****************************************************************************
	Email Validation Functions
*****************************************************************************/
function emailvalidate(emailid)
{
	var atrate =emailid.indexOf("@");

	var dot =emailid.indexOf(".",atrate );
	var compare;
	compare=(dot - atrate);
	if((atrate>=1)&&(compare>1))
	{
		return true;
	}
	else
	{
		return false;
	}
}


/****************************************************************************
	Numeric Validation Functions
*****************************************************************************/

function isInteger(s){
	var i;
    for (i = 0; i < s.length; i++){   
        // Check that current character is number.
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }
    // All characters are numbers.
    return true;
}

/****************************************************************************
	Date Validation Functions
*****************************************************************************/

function stripCharsInBag(s, bag){
	var i;
    var returnString = "";
    // Search through string's characters one by one.
    // If character is not in bag, append to returnString.
    for (i = 0; i < s.length; i++){   
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}

function daysInFebruary (year){
	// February has 29 days in any year evenly divisible by four,
    // EXCEPT for centurial years which are not also divisible by 400.
    return (((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28 );
}
function DaysArray(n) {
	for (var i = 1; i <= n; i++) {
		this[i] = 31
		if (i==4 || i==6 || i==9 || i==11) {this[i] = 30}
		if (i==2) {this[i] = 29}
   } 
   return this
}

function isDate(dtStr,format){
	var dtCh= "/";
	var minYear=1900;
	var maxYear=2100;
	
	if (format==null) format="usa";
	
	var daysInMonth = DaysArray(12);
	var pos1=dtStr.indexOf(dtCh);
	var pos2=dtStr.indexOf(dtCh,pos1+1);
	
	var strDay,strMonth,strYear
	
	if (format.toLowerCase()=='uk'){	
		strDay=dtStr.substring(0,pos1);
		strMonth=dtStr.substring(pos1+1,pos2);
		strYear=dtStr.substring(pos2+1);		
	}else{
		var strMonth=dtStr.substring(0,pos1);
		var strDay=dtStr.substring(pos1+1,pos2);
		var strYear=dtStr.substring(pos2+1);
	}
	
	
	var strYr=strYear;
	
	if (strDay.charAt(0)=="0" && strDay.length>1) strDay=strDay.substring(1)
	if (strMonth.charAt(0)=="0" && strMonth.length>1) strMonth=strMonth.substring(1)
	
	for (var i = 1; i <= 3; i++) {
		if (strYr.charAt(0)=="0" && strYr.length>1) strYr=strYr.substring(1)
	}
	month=parseInt(strMonth);
	day=parseInt(strDay);
	year=parseInt(strYr);
	if (pos1==-1 || pos2==-1){
		//alert("The date format should be : mm/dd/yyyy")
		return false;
	}
	if (strMonth.length<1 || month<1 || month>12){
		//alert("Please enter a valid month")
		return false;
	}
	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
		//alert("Please enter a valid day")
		return false
	}
	if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
		//alert("Please enter a valid 4 digit year between "+minYear+" and "+maxYear)
		return false;
	}
	if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
		//alert("Please enter a valid date")
		return false;
	}
return true;
}