jquery-calendar.js

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	/* Pop-up the calendar for a given input field.
	   @param  target  element - the input field attached to the calendar
	   @return void */
	showFor: function(target) {
		var input = (target.nodeName && target.nodeName.toLowerCase() == 'input' ? target : this);
		if (input.nodeName.toLowerCase() != 'input') { // find from button/image trigger
			input = $('input', input.parentNode)[0];
		}
		if (popUpCal._lastInput == input) { // already here
			return;
		}
		for (var i = 0; i < popUpCal._disabledInputs.length; i++) {  // check not disabled
			if (popUpCal._disabledInputs[i] == input) {
				return;
			}
		}
		var inst = popUpCal._getInst(input._calId);
		popUpCal.hideCalendar(inst, '');
		popUpCal._lastInput = input;
		inst._setDateFromField(input);
		if (popUpCal._inDialog) { // hide cursor
			input.value = '';
		}
		if (!popUpCal._pos) { // position below input
			popUpCal._pos = popUpCal._findPos(input);
			popUpCal._pos[1] += input.offsetHeight;
		}
		inst._calendarDiv.css('position', (popUpCal._inDialog && $.blockUI ? 'static' : 'absolute')).
			css('left', popUpCal._pos[0] + 'px').css('top', popUpCal._pos[1] + 'px');
		popUpCal._pos = null;
		var fieldSettings = inst._get('fieldSettings');
		$.extend(inst._settings, (fieldSettings ? fieldSettings(input) : {}));
		popUpCal._showCalendar(inst);
	},

	/* Construct and display the calendar. */
	_showCalendar: function(id) {
		var inst = this._getInst(id);
		popUpCal._updateCalendar(inst);
		if (!inst._inline) {
			var speed = inst._get('speed');
			inst._calendarDiv.show(speed, function() {
				popUpCal._popUpShowing = true;
				popUpCal._afterShow(inst);
			});
			if (speed == '') {
				popUpCal._popUpShowing = true;
				popUpCal._afterShow(inst);
			}
			if (inst._input[0].type != 'hidden') {
				inst._input[0].focus();
			}
			this._curInst = inst;
		}
	},

	/* Generate the calendar content. */
	_updateCalendar: function(inst) {
		inst._calendarDiv.empty().append(inst._generateCalendar());
		if (inst._input && inst._input != 'hidden') {
			inst._input[0].focus();
		}
	},

	/* Tidy up after displaying the calendar. */
	_afterShow: function(inst) {
		if ($.browser.msie) { // fix IE < 7 select problems
			$('#calendar_cover').css({width: inst._calendarDiv[0].offsetWidth + 4,
				height: inst._calendarDiv[0].offsetHeight + 4});
		}
		/*// re-position on screen if necessary
		var calDiv = inst._calendarDiv[0];
		var pos = popUpCal._findPos(inst._input[0]);
		if ((calDiv.offsetLeft + calDiv.offsetWidth) >
				(document.body.clientWidth + document.body.scrollLeft)) {
			inst._calendarDiv.css('left', (pos[0] + inst._input[0].offsetWidth - calDiv.offsetWidth) + 'px');
		}
		if ((calDiv.offsetTop + calDiv.offsetHeight) >
				(document.body.clientHeight + document.body.scrollTop)) {
			inst._calendarDiv.css('top', (pos[1] - calDiv.offsetHeight) + 'px');
		}*/
	},

	/* Hide the calendar from view.
	   @param  id     string/object - the ID of the current calendar instance,
			or the instance itself
	   @param  speed  string - the speed at which to close the calendar
	   @return void */
	hideCalendar: function(id, speed) {
		var inst = this._getInst(id);
		if (popUpCal._popUpShowing) {
			speed = (speed != null ? speed : inst._get('speed'));
			inst._calendarDiv.hide(speed, function() {
				popUpCal._tidyDialog(inst);
			});
			if (speed == '') {
				popUpCal._tidyDialog(inst);
			}
			popUpCal._popUpShowing = false;
			popUpCal._lastInput = null;
			inst._settings.prompt = null;
			if (popUpCal._inDialog) {
				popUpCal._dialogInput.css('position', 'absolute').
					css('left', '0px').css('top', '-100px');
				if ($.blockUI) {
					$.unblockUI();
					$('body').append(this._calendarDiv);
				}
			}
			popUpCal._inDialog = false;
		}
		popUpCal._curInst = null;
	},

	/* Tidy up after a dialog display. */
	_tidyDialog: function(inst) {
		inst._calendarDiv.removeClass('calendar_dialog');
		$('.calendar_prompt', inst._calendarDiv).remove();
	},

	/* Close calendar if clicked elsewhere. */
	_checkExternalClick: function(event) {
		if (!popUpCal._curInst) {
			return;
		}
		var target = $(event.target);
		if( (target.parents("#calendar_div").length == 0)
			&& (target.attr('class') != 'calendar_trigger')
			&& popUpCal._popUpShowing 
			&& !(popUpCal._inDialog && $.blockUI) )
		{
			popUpCal.hideCalendar(popUpCal._curInst, '');
		}
	},

	/* Adjust one of the date sub-fields. */
	_adjustDate: function(id, offset, period) {
		var inst = this._getInst(id);
		inst._adjustDate(offset, period);
		this._updateCalendar(inst);
	},

	/* Action for current link. */
	_gotoToday: function(id) {
		var date = new Date();
		var inst = this._getInst(id);
		inst._selectedDay = date.getDate();
		inst._selectedMonth = date.getMonth();
		inst._selectedYear = date.getFullYear();
		this._adjustDate(inst);
	},

	/* Action for selecting a new month/year. */
	_selectMonthYear: function(id, select, period) {
		var inst = this._getInst(id);
		inst._selectingMonthYear = false;
		inst[period == 'M' ? '_selectedMonth' : '_selectedYear'] =
			select.options[select.selectedIndex].value - 0;
		this._adjustDate(inst);
	},

	/* Restore input focus after not changing month/year. */
	_clickMonthYear: function(id) {
		var inst = this._getInst(id);
		if (inst._input && inst._selectingMonthYear && !$.browser.msie) {
			inst._input[0].focus();
		}
		inst._selectingMonthYear = !inst._selectingMonthYear;
	},

	/* Action for changing the first week day. */
	_changeFirstDay: function(id, a) {
		var inst = this._getInst(id);
		var dayNames = inst._get('dayNames');
		var value = a.firstChild.nodeValue;
		for (var i = 0; i < 7; i++) {
			if (dayNames[i] == value) {
				inst._settings.firstDay = i;
				break;
			}
		}
		this._updateCalendar(inst);
	},

	/* Action for selecting a day. */
	_selectDay: function(id, td) {
		var inst = this._getInst(id);
		inst._selectedDay = $("a", td).html();
		this._selectDate(id);
	},

	/* Erase the input field and hide the calendar. */
	_clearDate: function(id) {
		this._selectDate(id, '');
	},

	/* Update the input field with the selected date. */
	_selectDate: function(id, dateStr) {
		var inst = this._getInst(id);
		dateStr = (dateStr != null ? dateStr : inst._formatDate());
		if (inst._input) {
			inst._input.val(dateStr);
		}
		var onSelect = inst._get('onSelect');
		if (onSelect) {
			onSelect(dateStr);  // trigger custom callback
		}
		else {
			inst._input.trigger('change'); // fire the change event
		}
		if (inst._inline) {
			this._updateCalendar(inst);
		}
		else {
			this.hideCalendar(inst, inst._get('speed'));
		}
	},

	/* Set as customDate function to prevent selection of weekends.
	   @param  date  Date - the date to customise
	   @return [boolean, string] - is this date selectable?, what is its CSS class? */
	noWeekends: function(date) {
		var day = date.getDay();
		return [(day > 0 && day < 6), ''];
	},

	/* Find an object's position on the screen. */
	_findPos: function(obj) {
		if (obj.type == 'hidden') {
			obj = obj.nextSibling;
		}
		var curleft = curtop = 0;
		if (obj.offsetParent) {
			curleft = obj.offsetLeft;
			curtop = obj.offsetTop;
			while (obj = obj.offsetParent) {
				var origcurleft = curleft;
				curleft += obj.offsetLeft;
				if (curleft < 0) {
					curleft = origcurleft;
				}
				curtop += obj.offsetTop;
			}
		}
		return [curleft,curtop];
	}
});

/* Individualised settings for calendars applied to one or more related inputs.
   Instances are managed and manipulated through the PopUpCal manager. */
function PopUpCalInstance(settings, inline, defaultDate) {
	this._id = popUpCal._register(this);
	this._selectedDay = 0;
	this._selectedMonth = 0; // 0-11
	this._selectedYear = 0; // 4-digit year
	this._input = null; // The attached input field
	this._inline = inline; // True if showing inline, false if used in a popup
	this._calendarDiv = (!inline ? popUpCal._calendarDiv :
		$('<div id="calendar_div_' + this._id + '" class="calendar_inline"></div>'));
	if (inline) {
		var date = defaultDate;
		this._currentDate = defaultDate;
		this._currentDay = date.getDate();
		this._currentMonth = date.getMonth();
		this._currentYear = date.getFullYear();
	}
	// customise the calendar object - uses manager defaults if not overridden
	this._settings = $.extend({}, settings || {}); // clone
}

$.extend(PopUpCalInstance.prototype, {