/***************************
 Thank to Julian Robichaux -- http://www.nsftools.com for idea and his work
http://www.nsftools.com/tips/NotesTips.htm#datepicker
I've tested this lightly with Internet Explorer 6 and Mozilla Firefox. I have no idea
how compatible it is with other browsers.
version 1.5
December 4, 2005
Julian Robichaux -- http://www.nsftools.com
******************************/
var datePickerDivID = "datepicker";
var iFrameDivID = "datepickeriframe";
var dayArrayShort = new Array('H', 'K', 'Sz', 'Cs', 'P', 'Sz', ' V');
var dayArrayMed = new Array('Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat');
var dayArrayLong = new Array('hétfő', 'kedd', 'szerda', 'csütörtök', 'péntek', 'szombat', 'vasárnap');
var monthArrayShort = new Array('Jan', 'Feb', 'Már', 'Ápr', 'Máj', 'Jún', 'Júl', 'Aug', 'Sze', 'Okt', 'Nov', 'Dec');
var monthArrayMed = new Array('Jan', 'Feb', 'Mar', 'Apr', 'May', 'June', 'July', 'Aug', 'Sept', 'Oct', 'Nov', 'Dec');
var monthArrayLong = new Array('január', 'február', 'március', 'április', 'május', 'június', 'július', 'augusztus', 'szeptember', 'október', 'november', 'december');
 
var defaultDateSeparator = ".";				// common values would be "/" or "."
var defaultDateFormat = "ymd";				// valid values are "mdy", "dmy", and "ymd"
var dateSeparator = defaultDateSeparator;
var dateFormat = defaultDateFormat;								 
function convertDay(day)
{			
	return day == 0 ? 6 : day - 1;
}
function displayDatePicker(dateFieldName, displayBelowThisObject, dtFormat, dtSep)
{
	var targetDateField = document.getElementsByName (dateFieldName).item(0);
 
	if (!displayBelowThisObject)
		displayBelowThisObject = targetDateField;
 
	if (dtSep)
		dateSeparator = dtSep;
	else
		dateSeparator = defaultDateSeparator;
 
	if (dtFormat)
		dateFormat = dtFormat;
	else
		dateFormat = defaultDateFormat;
 
	var x = displayBelowThisObject.offsetLeft;
	var y = displayBelowThisObject.offsetTop + displayBelowThisObject.offsetHeight ;
 
	var parent = displayBelowThisObject;
	while (parent.offsetParent) {
		parent = parent.offsetParent;
		x += parent.offsetLeft;
		y += parent.offsetTop ;
	}
 
	drawDatePicker(targetDateField, x, y);
}
function drawDatePicker(targetDateField, x, y)
{
	var dt = getFieldDate(targetDateField.value );
 
	if (!document.getElementById(datePickerDivID)) {
		var newNode = document.createElement("div");
		newNode.setAttribute("id", datePickerDivID);
		newNode.setAttribute("class", "dpDiv");
		newNode.setAttribute("style", "visibility: hidden;");
		document.body.appendChild(newNode);
	}
 
	var pickerDiv = document.getElementById(datePickerDivID);
	pickerDiv.style.position = "absolute";
	pickerDiv.style.left = x + "px";
	pickerDiv.style.top = y + "px";
	pickerDiv.style.visibility = (pickerDiv.style.visibility == "visible" ? "hidden" : "visible");
	pickerDiv.style.display = (pickerDiv.style.display == "block" ? "none" : "block");
	pickerDiv.style.zIndex = 10000;
	refreshDatePicker(targetDateField.name, dt.getFullYear(), dt.getMonth(), dt.getDate());
}
/**
This is the function that actually draws the datepicker calendar.
*/
function refreshDatePicker(dateFieldName, year, month, day)
{
	// if no arguments are passed, use today's date; otherwise, month and year
	// are required (if a day is passed, it will be highlighted later)
	var thisDay = new Date();
 
	if ((month >= 0) && (year > 0)) {
		thisDay = new Date(year, month, 1);
	} else {
		day = thisDay.getDate();
		thisDay.setDate(1);
	}
 
	// the calendar will be drawn as a table
	// you can customize the table elements with a global CSS style sheet,
	// or by hardcoding style and formatting elements below
	var crlf = "\r\n";
	var TABLE = "<table cols=7 class='dpTable'>" + crlf;
	var xTABLE = "</table>" + crlf;
	var TR = "<tr class='dpTR'>";
	var TR_title = "<tr class='dpTitleTR'>";
	var TR_days = "<tr class='dpDayTR'>";
	var TR_todaybutton = "<tr class='dpTodayButtonTR'>";
	var xTR = "</tr>" + crlf;
	var TD = "<td class='dpTD' onMouseOut='this.className=\"dpTD\";' onMouseOver=' this.className=\"dpTDHover\";' ";		// leave this tag open, because we'll be adding an onClick event
	var TD_title = "<td colspan=5 class='dpTitleTD'>";
	var TD_buttons = "<td class='dpButtonTD'>";
	var TD_todaybutton = "<td colspan=7 class='dpTodayButtonTD'>";
	var TD_days = "<td class='dpDayTD'>";
	var TD_selected = "<td class='dpDayHighlightTD' onMouseOut='this.className=\"dpDayHighlightTD\";' onMouseOver='this.className=\"dpTDHover\";' ";		// leave this tag open, because we'll be adding an onClick event
	var xTD = "</td>" + crlf;
	var DIV_title = "<div class='dpTitleText'>";
	var DIV_selected = "<div class='dpDayHighlight'>";
	var xDIV = "</div>";
 
	// start generating the code for the calendar table
	var html = TABLE;
 
	// this is the title bar, which displays the month and the buttons to
	// go back to a previous month or forward to the next month
	html += TR_title;
	html += TD_buttons + getButtonCode(dateFieldName, thisDay, -1, "&lt;") + xTD;
	html += TD_title + DIV_title + thisDay.getFullYear() + " " + monthArrayLong[ thisDay.getMonth()] + xDIV + xTD;
	html += TD_buttons + getButtonCode(dateFieldName, thisDay, 1, "&gt;") + xTD;
	html += xTR;
 
	// this is the row that indicates which day of the week we're on
	html += TR_days;
	for(i = 0; i < dayArrayShort.length; i++)
		html += TD_days + dayArrayShort[i] + xTD;
	html += xTR;
	// now we'll start populating the table with days of the month
	html += TR;
 
	// first, the leading blanks	
	for (i = 0; i < convertDay(thisDay.getDay()); i++)
		html += TD + "&nbsp;" + xTD;
	// now, the days of the month
	do {
		dayNum = thisDay.getDate();
		TD_onclick = " onclick=\"updateDateField('" + dateFieldName + "', '" + getDateString(thisDay) + "');\">";
		
		if (dayNum == day)
			html += TD_selected + TD_onclick + DIV_selected + dayNum + xDIV + xTD;
		else
			html += TD + TD_onclick + dayNum + xTD;
		
		// if this is a Saturday, start a new row
		if (convertDay(thisDay.getDay()) == 6)
			html += xTR + TR;
		
		// increment the day
		thisDay.setDate(thisDay.getDate() + 1);
	} while (thisDay.getDate() > 1);
 
	// fill in any trailing blanks
	if (convertDay(thisDay.getDay()) > 0) {
		for (i = 6; i > convertDay(thisDay.getDay()); i--)
			html += TD + "&nbsp;" + xTD;
	}
	html += xTR;
 
	// add a button to allow the user to easily return to today, or close the calendar
	var today = new Date();
	var todayString = "Today is " + dayArrayMed[convertDay(today.getDay())] + ", " + monthArrayMed[ today.getMonth()] + " " + today.getDate();
	html += TR_todaybutton + TD_todaybutton;
	html += "<button class='dpTodayButton' onClick='refreshDatePicker(\"" + dateFieldName + "\");'>Most</button> ";
	html += "<button class='dpCloseButton' onClick='updateDateField(\"" + dateFieldName + "\");'>X</button>";
	html += xTD + xTR;
 
	// and finally, close the table
	html += xTABLE;
	document.getElementById(datePickerDivID).innerHTML = html;
	// add an "iFrame shim" to allow the datepicker to display above selection lists
	adjustiFrame();
}
/**
Convenience function for writing the code for the buttons that bring us back or forward
a month.
*/
function getButtonCode(dateFieldName, dateVal, adjust, label)
{
	var newMonth = (dateVal.getMonth () + adjust) % 12;
	var newYear = dateVal.getFullYear() + parseInt((dateVal.getMonth() + adjust) / 12);
	if (newMonth < 0) {
		newMonth += 12;
		newYear += -1;
	}
 
	return "<button class='dpButton' onClick='refreshDatePicker(\"" + dateFieldName + "\", " + newYear + ", " + newMonth + ");'>" + label + "</button>";
}
/**
Convert a JavaScript Date object to a string, based on the dateFormat and dateSeparator
variables at the beginning of this script library.
*/
function getDateString(dateVal)
{
	var dayString = "00" + dateVal.getDate();
	var monthString = "00" + (dateVal.getMonth()+1);
	dayString = dayString.substring(dayString.length - 2);
	monthString = monthString.substring(monthString.length - 2);
 
	switch (dateFormat) {
		case "dmy" :
			return dayString + dateSeparator + monthString + dateSeparator + dateVal.getFullYear();
		case "ymd" :
			return dateVal.getFullYear() + dateSeparator + monthString + dateSeparator + dayString;
		case "mdy" :
		default :
			return monthString + dateSeparator + dayString + dateSeparator + dateVal.getFullYear();
	}
}
/**
Convert a string to a JavaScript Date object.
*/
function getFieldDate(dateString)
{
	var dateVal;
	var dArray;
	var d, m, y;
 
	try {
		dArray = splitDateString(dateString);
		if (dArray) {
			switch (dateFormat) {
				case "dmy" :
					d = parseInt(dArray[0], 10);
					m = parseInt(dArray[1], 10) - 1;
					y = parseInt(dArray[2], 10);
					break;
				case "ymd" :
					d = parseInt(dArray[2], 10);
					m = parseInt(dArray[1], 10) - 1;
					y = parseInt(dArray[0], 10);
					break;
				case "mdy" :
				default :
					d = parseInt(dArray[1], 10);
					m = parseInt(dArray[0], 10) - 1;
					y = parseInt(dArray[2], 10);
					break;
			}
			dateVal = new Date(y, m, d);
		} else if (dateString) {
			dateVal = new Date(dateString);
		} else {
			dateVal = new Date();
		}
	} catch(e) {
		alert('A dátum hibás formátumú!');
		dateVal = new Date();
	}
 
	return dateVal;
}
/**
Try to split a date string into an array of elements, using common date separators.
If the date is split, an array is returned; otherwise, we just return false.
*/
function splitDateString(dateString)
{
	var dArray;
	if (dateString.indexOf("/") >= 0)
		dArray = dateString.split("/");
	else if (dateString.indexOf(".") >= 0)
		dArray = dateString.split(".");
	else if (dateString.indexOf("-") >= 0)
		dArray = dateString.split("-");
	else if (dateString.indexOf("\\") >= 0)
		dArray = dateString.split("\\");
	else
		dArray = false;
 
	return dArray;
}
function datePickerClosed(dateField)
{
	var dateObj = getFieldDate(dateField.value);
	var today = new Date();
	today = new Date(today.getFullYear(), today.getMonth(), today.getDate());
 
	if (dateField.name == "StartDate") {
		if (dateObj < today) {
			// if the date is before today, alert the user and display the datepicker again
			alert("Please enter a date that is today or later");
			dateField.value = "";
			document.getElementById(datePickerDivID).style.visibility = "visible";
			adjustiFrame();
		} else {
			// if the date is okay, set the EndDate field to 7 days after the StartDate
			dateObj.setTime(dateObj.getTime() + (7 * 24 * 60 * 60 * 1000));
			var endDateField = document.getElementsByName ("EndDate").item(0);
			endDateField.value = getDateString(dateObj);
		}
	}
}
function updateDateField(dateFieldName, dateString)
{
	var targetDateField = document.getElementsByName (dateFieldName).item(0);
	if (dateString)
		targetDateField.value = dateString;
 
	var pickerDiv = document.getElementById(datePickerDivID);
	pickerDiv.style.visibility = "hidden";
	pickerDiv.style.display = "none";
 
	adjustiFrame();
	targetDateField.focus();
 
	if ((dateString) && (typeof(datePickerClosed) == "function"))
		datePickerClosed(targetDateField);
}
function adjustiFrame(pickerDiv, iFrameDiv)
{
	// we know that Opera doesn't like something about this, so if we
	// think we're using Opera, don't even try
	var is_opera = (navigator.userAgent.toLowerCase().indexOf("opera") != -1);
		if (is_opera)
			return;
	
	// put a try/catch block around the whole thing, just in case
	try {
		if (!document.getElementById(iFrameDivID)) {
			// don't use innerHTML to update the body, because it can cause global variables
			// that are currently pointing to objects on the page to have bad references
			//document.body.innerHTML += "<iframe id='" + iFrameDivID + "' src='javascript:false;' scrolling='no' frameborder='0'>";
			var newNode = document.createElement("iFrame");
			newNode.setAttribute("id", iFrameDivID);
//			newNode.setAttribute("src", "javascript:false;");
			newNode.setAttribute("scrolling", "no");
			newNode.setAttribute ("frameborder", "0");
			document.body.appendChild(newNode);
		}
		
		if (!pickerDiv)
			pickerDiv = document.getElementById(datePickerDivID);
		if (!iFrameDiv)
			iFrameDiv = document.getElementById(iFrameDivID);
		
		try {
			iFrameDiv.style.position = "absolute";
			iFrameDiv.style.width = pickerDiv.offsetWidth;
			iFrameDiv.style.height = pickerDiv.offsetHeight ;
			iFrameDiv.style.top = pickerDiv.style.top;
			iFrameDiv.style.left = pickerDiv.style.left;
			iFrameDiv.style.zIndex = pickerDiv.style.zIndex - 1;
			iFrameDiv.style.visibility = pickerDiv.style.visibility ;
			iFrameDiv.style.display = pickerDiv.style.display;
			iFrameDiv.style.background = pickerDiv.style.background;
		} catch(e) {
		}
 
 	} catch (ee) {
	}
 
}
function fillValues(prm){
	var today = new Date();
	var ev = today.getFullYear();
	var ho = today.getMonth();
	var na = today.getDate();
	var thisDay = new Date();
	var dayNum;
	var i;
	var k_ev;
	var k_ho;
	var k_nap;
	if (prm) {
		for (var j = 0; j < prm.length; j++) {
			k_ev = document.forms[0].elements[prm[j] + '_ev'];
			k_ho = document.forms[0].elements[prm[j] + '_ho'];
			k_nap = document.forms[0].elements[prm[j] + '_nap'];
			for (i = ev - 5; i <= ev + 5; i++) {
				k_ev.options[k_ev.options.length] = new Option(i.toString(), i.toString(), false, false);
			}
			k_ev.options[5].selected = true;
	
			for (i = 0; i <= 11; i++) {
				k_ho.options[k_ho.options.length] = new Option(monthArrayLong[i], i.toString(), false, false);
			}
			k_ho.options[ho].selected = true;
			thisDay.setDate(1);	
	
			do {
   			dayNum = thisDay.getDate();
    
    			if (dayNum == na)
					k_nap.options[k_nap.options.length] = new Option(dayNum.toString(), dayNum.toString(), true, true);
				else
					k_nap.options[k_nap.options.length] = new Option(dayNum.toString(), dayNum.toString(), false, false);
				thisDay.setDate(thisDay.getDate() + 1);
			} while (thisDay.getDate() > 1);
		}
	}
}
function setNewDay(prm) {
	var k_ev;
	var k_ho;
	var k_nap;
	var today = new Date();
	var thisDay = new Date();
	var dayNum;
	var k_ev = document.forms[0].elements[prm + '_ev'];
	var k_ho = document.forms[0].elements[prm + '_ho'];
	var k_nap = document.forms[0].elements[prm + '_nap'];
	thisDay.setFullYear(k_ev.options[k_ev.options.selectedIndex].value, k_ho.selectedIndex);
	thisDay.setDate(1);
	k_nap.options.length = 0;
	do {
   	dayNum = thisDay.getDate();
		k_nap.options[k_nap.options.length] = new Option(dayNum.toString(), dayNum.toString(), false, false);
		thisDay.setDate(thisDay.getDate() + 1);
	} while (thisDay.getDate() > 1);
	
}