/* MarcGrabanski.com */

/* Pop-Up Calendar Built from Scratch by Marc Grabanski */

var popUpCal = {
    selectedMonth: new Date().getMonth(), // 0-11
    selectedYear: new Date().getFullYear(), // 4-digit year
    selectedDay: new Date().getDate(),
    calendarId: 'calendarDiv',
    inputClass: 'calendarSelectDate',
       
    drawCalendar: function (inputObj) {
		
		var html = '';
		html = '';
		html += '<table cellpadding="0" cellspacing="0" id="linksTable"><tr>';
    	html += '	<td><a id="prevMonth"><< Vorige</a></td>';
		html += '	<td><a id="nextMonth">Volgende >></a></td>';
		html += '</tr></table>';
		html += '<table id="calendar" cellpadding="0" cellspacing="0"><tr>';
		html += '<th colspan="7" class="calendarHeader">'+getMonthName(popUpCal.selectedMonth)+' '+popUpCal.selectedYear+'</th>';
		html += '</tr><tr class="weekDaysTitleRow">';
        var weekDays = new Array('M','D','W','D','V','Z','Z');
        for (var j=0; j<weekDays.length; j++) {
			html += '<td>'+weekDays[j]+'</td>';
        }
		
        var daysInMonth = getDaysInMonth(popUpCal.selectedYear, popUpCal.selectedMonth);
        var startDay = getFirstDayofMonth(popUpCal.selectedYear, popUpCal.selectedMonth);
        var numRows = 0;
        var printDate = 1;
        if (startDay != 7) {
            numRows = Math.ceil(((startDay+1)+(daysInMonth))/7); // calculate the number of rows to generate
        }
		
        // calculate number of days before calendar starts
        if (startDay != 7) {
            var noPrintDays = startDay + 1; 
        } else {
            var noPrintDays = 0; // if sunday print right away	
        }
		var today = new Date().getDate();
		var thisMonth = new Date().getMonth();
		var thisYear = new Date().getFullYear();
        // create calendar rows
        for (var e=0; e<numRows; e++) {
			html += '<tr class="weekDaysRow">';
            // create calendar days
            for (var f=0; f<7; f++) {
				if ( (printDate == today) 
					 && (popUpCal.selectedYear == thisYear) 
					 && (popUpCal.selectedMonth == thisMonth) 
					 && (noPrintDays == 0)) {
					html += '<td id="today" class="weekDaysCell">';
				} else {
                	html += '<td class="weekDaysCell">';
				}
                if (noPrintDays == 0) {
					if (printDate <= daysInMonth) {
						html += '<a>'+printDate+'</a>';
					}
                    printDate++;
                }
                html += '</td>';
                if(noPrintDays > 0) noPrintDays--;
            }
            html += '</tr>';
        }
		html += '</table>';
        
		if (document.getElementById("linksTable")) {
			document.getElementById(popUpCal.calendarId).innerHTML = html;
		} else {
			document.write(html);
		}
		
		// setup next and previous links
        document.getElementById('prevMonth').onclick = function () {
            popUpCal.selectedMonth--;
            if (popUpCal.selectedMonth < 0) {
                popUpCal.selectedMonth = 11;
                popUpCal.selectedYear--;
            }
			popUpCal.drawCalendar(inputObj); 
			//popUpCal.setupLinks(inputObj);
        }
        document.getElementById('nextMonth').onclick = function () {
            popUpCal.selectedMonth++;
            if (popUpCal.selectedMonth > 11) {
                popUpCal.selectedMonth = 0;
                popUpCal.selectedYear++;
            }
            popUpCal.drawCalendar(inputObj); 
            //popUpCal.setupLinks(inputObj);
        }
        
    }, // end drawCalendar function
    
    setupLinks: function (inputObj) {
        // set up link events on calendar table
        var y = document.getElementById('calendar');
        var x = y.getElementsByTagName('a');
        for (var i=0; i<x.length; i++) {
            x[i].onmouseover = function () {
                this.parentNode.className = 'weekDaysCellOver';
            }
            x[i].onmouseout = function () {
                this.parentNode.className = 'weekDaysCell';
            }
            x[i].onclick = function () {
                document.getElementById(popUpCal.calendarId).style.display = 'none';
                popUpCal.selectedDay = this.innerHTML;
                inputObj.value = formatDate(popUpCal.selectedDay, popUpCal.selectedMonth, popUpCal.selectedYear);		
            }
        }
    }
    
}
/* Functions Dealing with Dates */

function formatDate(Day, Month, Year) {
    Month++; // adjust javascript month
    if (Month <10) Month = '0'+Month; // add a zero if less than 10
    if (Day < 10) Day = '0'+Day; // add a zero if less than 10
    var dateString = Month+'/'+Day+'/'+Year;
    return dateString;
}

function getMonthName(month) {
    var monthNames = new Array('Januari','Februari','Maart','April','Mei','Juni','Juli','Augustus','September','Oktober','November','December');
    return monthNames[month];
}

function getDayName(day) {
    var dayNames = new Array('Maandag','Dinsdag','Woensdag','Donderdag','Vrijdag','Zaterdag','Zondag')
    return dayNames[day];
}

function getDaysInMonth(year, month) {
    return 32 - new Date(year, month, 32).getDate();
}

function getFirstDayofMonth(year, month) {
    var day;
    day = new Date(year, month, -1).getDay();
    return day;
}