// DHTML Calendar
// $Author: Karl Agius $
// $Date: 2005/02/15 21:54:32 $
// $Revision: 1.1 $

function Calendar (cname, id, date)
{
// Used to notify the calendar that it is attached to a single html field.
this.fallback_single = 0;

// Used to notify the claendar that it is attached to 3 html fields.
this.fallback_multi = 1;

// Used to notify the calendar that it is attached to both field sets.
this.fallback_both = 2;

// Read-only calendar
this.viewOnly = false;

// Allows the user to select weekends
this.allowWeekends = true;

// Allows the user to select weekdays
this.allowWeekdays = true;

// The minimum date that the user can select (inclusive)
this.minDate = "--";

// The maximum date that the user can select (exclusive)
this.maxDate = "--";

// Allow the user to scroll dates
this.scrolling = true;

// The id of this calendar
this.name = cname;

// The first day of the week in the calendar (0-Sunday, 6-Saturday)
this.firstDayOfWeek = 1;

// Fallback method
this.fallback = this.fallback_both;

// Sets the date and strips out time information
this.calendarDate = date;
this.calendarDate.setUTCHours(0);
this.calendarDate.setUTCMinutes(0);
this.calendarDate.setUTCSeconds(0);
this.calendarDate.setUTCMilliseconds(0);

// The field id that the calendar is attached to.
// For single input, this is used "as is". for the
// Multi-input, it is given a suffix for _day, _month
// and _year inputs.
this.attachedId = id;

// The left and right month control icons
this.controlLeft = "«";
this.controlRight = "»";

// The left and right month control icons (when disabled)
this.controlLeftDisabled = "";
this.controlRightDisabled = "";

// The css classes for the calendar and header
this.calendarStyle = "cal_calendar";
this.headerStyle = "cal_header";
this.headerCellStyle = "cal_cell";
this.headerCellStyleLabel = "cal_labelcell";

// The css classes for the rows
this.weekStyle = "cal_week";
this.evenWeekStyle = "cal_evenweek";
this.oddWeekStyle = "cal_oddweek";

// The css classes for the day elements
this.dayStyle = "cal_day";
this.disabledDayStyle = "cal_disabled";
this.commonDayStyle = "cal_common";
this.holidayDayStyle = "cal_holiday";
this.eventDayStyle = "cal_event";
this.todayDayStyle = "cal_today";

// specifies the labels for this calendar
this.dayLabels = new Array("Paz", "Pzt", "Sal", "Çrş", "Prş", "Cum", "Cmt");
this.monthLabels = new Array(
"Ocak", "Şubat", "Mart", "Nisan"
, "Mayıs", "Haziran", "Temmuz", "Ağustos"
, "Eylül", "Ekim", "Kasım", "Aralık");

// Specifies the dates of any event. The events are to be defined as arrays,
// with element 0 being the date and element 1 being an id.
this.eventDates = new Array();

// Attach event handlers to any fallback fields.
if (this.viewOnly == false) {

setFieldValue(this.attachedId, this.calendarDate);

if ((this.fallback = this.fallback_both) || (this.fallback = this.fallback_single)) {
eval("document.getElementById(\"" + this.attachedId + "\").onchange = function () {updateFromSingle("+this.name+", this);}");
}

if ((this.fallback = this.fallback_both) || (this.fallback = this.fallback_multi)) {

eval("document.getElementById(\"day_" + this.attachedId + "\").onchange = function () {updateFromMultiDay("+this.name+", this);}");
eval("document.getElementById(\"month_" + this.attachedId + "\").onchange = function () {updateFromMultiMonth("+this.name+", this);}");
eval("document.getElementById(\"year_" + this.attachedId + "\").onchange = function () {updateFromMultiYear("+this.name+", this);}");

}
} 

selectEvent = new Function();
}

function updateFromSingle (sender, helper) {
newDate = new Date (helper.value);
newDate.setUTCDate(newDate.getUTCDate()+1);
sender.calendarDate = newDate;

renderCalendar (sender);
setFieldValue(sender.attachedId, sender.calendarDate);
}

function updateFromMultiDay (sender, helper) {

if (isNaN(helper.value)) {
helper.value = sender.calendarDate.getUTCDate();
return false;
}

sender.calendarDate.setUTCDate(helper.value);
renderCalendar (sender);
setFieldValue(sender.attachedId, sender.calendarDate);
}

function updateFromMultiMonth (sender, helper) {

if (isNaN(helper.value)) {
helper.value = sender.calendarDate.getUTCMonths() -1;
return false;
}

sender.calendarDate.setUTCMonth(helper.value-1);
renderCalendar (sender);
setFieldValue(sender.attachedId, sender.calendarDate);
}

function updateFromMultiYear (sender, helper) {

if (isNaN(helper.value)) {
helper.value = sender.calendarDate.getUTCFullYear();
return false;
}

sender.calendarDate.setUTCFullYear(helper.value);
renderCalendar (sender);
setFieldValue(sender.attachedId, sender.calendarDate);
}

function getFirstCalendarDate (calendar)
{
return new Date (
calendar.calendarDate.getUTCFullYear()
, calendar.calendarDate.getUTCMonth()
, 1
);
}

function renderCalendar (calendar)
{
calHtml1 =  ("<table id=\"cal_" + calendar.attachedId + "\" class=\"" + calendar.calendarStyle +"\">");
calHtml1 += ((calendar.scrolling)?buildHeader(calendar):buildStaticHeader(calendar));
calHtml1 += buildCalendarTable (calendar);
calHtml1 += ("</table>");

document.getElementById("cal_display_" + calendar.attachedId + "").innerHTML = calHtml1;
}

function scrollMonthBack (calendar)
{
calendar.calendarDate.setUTCMonth(calendar.calendarDate.getUTCMonth() - 1);
setFieldValue(calendar.attachedId, calendar.calendarDate);
renderCalendar (calendar);
}

function selectDate (calendar, day)
{
if (!calendar.viewOnly) {
calendar.calendarDate.setUTCDate(day);
setFieldValue(calendar.attachedId, calendar.calendarDate);
renderCalendar (calendar);
}
}

function scrollMonthForward (calendar)
{
calendar.calendarDate.setUTCMonth(calendar.calendarDate.getUTCMonth() + 1);
setFieldValue(calendar.attachedId, calendar.calendarDate);
renderCalendar (calendar);
}

function setFieldValue(fieldId, date) {
document.getElementById(fieldId).value = date.getUTCDate() + "-" + (date.getUTCMonth()+1) + "-" + date.getUTCFullYear();
document.getElementById("year_" + fieldId ).value = date.getUTCFullYear();
document.getElementById("month_" + fieldId ).selectedIndex = date.getUTCMonth();
document.getElementById("day_" + fieldId ).value = date.getUTCDate();
}

function buildHeader (calendar)
{

enableLeft = true;
enableRight = true;

if (calendar.minDate != "--") 
{
if (calendar.calendarDate.getUTCFullYear() <= calendar.minDate.getUTCFullYear())
{
if (calendar.calendarDate.getUTCMonth() <= calendar.minDate.getUTCMonth())
{
enableLeft = false;
}
}
}

if (calendar.maxDate != "--") 
{
if (calendar.calendarDate.getUTCFullYear() >= calendar.maxDate.getUTCFullYear())
{
if (calendar.calendarDate.getUTCMonth() >= calendar.maxDate.getUTCMonth())
{
enableRight = false;
}
}
}

calHtml2 = "";

calHtml2 +=  (
"<tr class=\""
+ calendar.headerStyle
+ "\">");
calHtml2 +=  (
"<td class=\""
+ calendar.headerCellStyle
+ ((enableLeft)?("\" onclick=\"scrollMonthBack(" + calendar.name + ")"):"")
+ "\">"
+ ((enableLeft)?calendar.controlLeft:calendar.controlLeftDisabled)
+ "</td>");
calHtml2 +=  (
"<td colspan=\"5\" class=\""
+ calendar.headerCellStyleLabel
+ "\">"
+ calendar.monthLabels[calendar.calendarDate.getUTCMonth()] 
+ ", " + calendar.calendarDate.getUTCFullYear()
+ "</td>");
calHtml2 +=  (
"<td class=\""
+ calendar.headerCellStyle
+ ((enableRight)?("\" onclick=\"scrollMonthForward(" + calendar.name + ")"):"")
+ "\">"
+ ((enableRight)?calendar.controlRight:calendar.controlRightDisabled)
+ "</td>");

calHtml2 += ("</tr>");

calHtml2 +=  (
"<tr class=\""
+ calendar.headerStyle
+ "\">")

for (i = 0; i < 7; i++) {
showDay = i + calendar.firstDayOfWeek;
if (showDay > 6) showDay = showDay - 7;
calHtml2 +=  (
"<td class=\""
+ calendar.headerCellStyle
+ "\">"
+ calendar.dayLabels[showDay]
+ "</td>");
}

calHtml2 += ("</tr>");
return calHtml2
}

function buildStaticHeader (calendar)
{
calHtml2 = "";

calHtml2 +=  (
"<tr class=\""
+ calendar.headerStyle
+ "\">");
calHtml2 +=  (
"<td colspan=\"7\" class=\""
+ calendar.headerCellStyleLabel
+ "\">"
+ calendar.monthLabels[calendar.calendarDate.getUTCMonth()] 
+ ", " + calendar.calendarDate.getUTCFullYear()
+ "</td>");
calHtml2 += ("</tr>");

calHtml2 +=  (
"<tr class=\""
+ calendar.headerStyle
+ "\">")

for (i = 0; i < 7; i++) {
showDay = i + calendar.firstDayOfWeek;
if (showDay > 6) showDay = showDay - 7;
calHtml2 +=  (
"<td class=\""
+ calendar.headerCellStyle
+ "\">"
+ calendar.dayLabels[showDay]
+ "</td>");
}

calHtml2 += ("</tr>");
return calHtml2
}




function RenderDayDisabled (calendar, currentDate)
{
calHtml += ('<td class="day">');
calHtml += ("<span class=\"" + calendar.disabledDayStyle + "\">");
calHtml += (currentDate.getUTCDate());
calHtml += ("</span>");
calHtml += ("</td>");
}

function RenderDayEnabled (calendar, currentDate, dayStyle)
{
currentDayStyle = dayStyle;
calHtml += ('<td class="day">');
calHtml += ("<span class=\"" + dayStyle + "\" onclick=\"selectDate(" + calendar.name + ", " + currentDate.getUTCDate() + ")\">");
calHtml += (currentDate.getUTCDate());
calHtml += ("</span>");
calHtml += ("</td>");
}

function RenderDayEvent (calendar, currentDate, dayStyle, eventId)
{
currentDayStyle = dayStyle;
calHtml += ('<td class="day">');
calHtml += ("<span class=\"" + dayStyle + "\" onclick=\"selectDate(" + calendar.name + ", " + currentDate.getUTCDate() + "); " + calendar.name + ".selectEvent('" + eventId + "')\">");
calHtml += (currentDate.getUTCDate());
calHtml += ("</span>");
calHtml += ("</td>");
}

function buildCalendarTable (calendar)
{
currentDate = getFirstCalendarDate(calendar);
odd = 0;
while (currentDate.getUTCDay() != calendar.firstDayOfWeek)
{
currentDate.setUTCDate(currentDate.getUTCDate() - 1);
}

calHtml = "";
do
{
odd += 1;

calHtml +=  (
"<tr class=\"" + (((odd%2)==0) ? calendar.evenWeekStyle : calendar.oddWeekStyle) + "\">")

for (i = 0;i < 7;i++)
{
currentDayStyle = calendar.dayStyle;
currentEventStyle = calendar.commonDayStyle;
currentDateString = currentDate.getUTCFullYear() + "/" + (currentDate.getUTCMonth()+1) + "/" + currentDate.getUTCDate();

if (currentDate < calendar.minDate) 
{
RenderDayDisabled (calendar, currentDate);
} 
else if (currentDate > calendar.maxDate) 
{
RenderDayDisabled (calendar, currentDate);
} 
else if (currentDate.getUTCMonth() != calendar.calendarDate.getUTCMonth())
{
RenderDayDisabled (calendar, currentDate);
}
else if (currentDate.getUTCDate() == calendar.calendarDate.getUTCDate())
{
if ((currentDate.getUTCDay() == 0) || (currentDate.getUTCDay() == 6))
{
if (calendar.allowWeekends == true)
{
RenderDayEnabled (calendar, currentDate, calendar.todayDayStyle);
} 
else 
{
RenderDayDisabled (calendar, currentDate);
month = calendar.calendarDate.getUTCMonth();
calendar.calendarDate.setUTCDate(calendar.calendarDate.getUTCDate()+1);
if (month != calendar.calendarDate.getUTCMonth())
{
renderCalendar(calendar);
}
setFieldValue(calendar.attachedId, calendar.calendarDate);
}
} else {
if (calendar.allowWeekdays == true)
{
RenderDayEnabled (calendar, currentDate, calendar.todayDayStyle);
} 
else 
{
RenderDayDisabled (calendar, currentDate);
month = calendar.calendarDate.getUTCMonth();
calendar.calendarDate.setUTCDate(calendar.calendarDate.getUTCDate()+1);
if (month != calendar.calendarDate.getUTCMonth())
{
renderCalendar(calendar);
}
setFieldValue(calendar.attachedId, calendar.calendarDate);
}
}
}
else if ((currentDate.getUTCDay() == 0) || (currentDate.getUTCDay() == 6))
{
if (calendar.allowWeekends == true)
{

style = calendar.holidayDayStyle

for (j=0; j < calendar.eventDates.length; j++)
{
if (calendar.eventDates[j][0] == currentDateString) 
{
style = calendar.eventDayStyle;
RenderDayEvent (calendar, currentDate, style, calendar.eventDates[j][0]);
}
}

if (style == calendar.holidayDayStyle)
{
RenderDayEnabled (calendar, currentDate, style);
}
} 
else 
{
RenderDayDisabled (calendar, currentDate);
}
} else {
if (calendar.allowWeekdays == true)
{
style = calendar.commonDayStyle

for (j=0; j < calendar.eventDates.length; j++)
{
if (calendar.eventDates[j][0] == currentDateString) 
{
style = calendar.eventDayStyle;
RenderDayEvent (calendar, currentDate, style, calendar.eventDates[j][0]);
}
}

if (style == calendar.commonDayStyle)
{
RenderDayEnabled (calendar, currentDate, style);
}
} 
else 
{
RenderDayDisabled (calendar, currentDate);
}
}

currentDate.setUTCDate(currentDate.getUTCDate() + 1);
}

calHtml += ("</tr>");


} while (currentDate.getUTCMonth() == calendar.calendarDate.getUTCMonth());
return calHtml;
}

// $Log: calendar.js,v $
// Revision 1.1  2005/02/15 21:54:32  Karl Agius
// Initial release
//