jquery-calendar.js

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	/* Get a setting value, defaulting if necessary. */
	_get: function(name) {
		return (this._settings[name] != null ? this._settings[name] : popUpCal._defaults[name]);
	},

	/* Parse existing date and initialise calendar. */
	_setDateFromField: function(input) {
		this._input = $(input);
		var dateFormat = this._get('dateFormat');
		var currentDate = this._input.val().split(dateFormat.charAt(3));
		if (currentDate.length == 3) {
			this._currentDay = parseInt(currentDate[dateFormat.indexOf('D')], 10);
			this._currentMonth = parseInt(currentDate[dateFormat.indexOf('M')], 10) - 1;
			this._currentYear = parseInt(currentDate[dateFormat.indexOf('Y')], 10);
		}
		else {
			var date = new Date();
			this._currentDay = date.getDate();
			this._currentMonth = date.getMonth();
			this._currentYear = date.getFullYear();
		}
		this._selectedDay = this._currentDay;
		this._selectedMonth = this._currentMonth;
		this._selectedYear = this._currentYear;
		this._adjustDate();
	},

	/* Set the date directly. */
	_setDate: function(date) {
		this._selectedDay = this._currentDay = date.getDate();
		this._selectedMonth = this._currentMonth = date.getMonth();
		this._selectedYear = this._currentYear = date.getFullYear();
		this._adjustDate();
	},

	/* Retrieve the date directly. */
	_getDate: function() {
		return new Date(this._currentYear, this._currentMonth, this._currentDay);
	},

	/* Generate the HTML for the current state of the calendar. */
	_generateCalendar: function() {
		var today = this._currentDate;
		today = new Date(today.getFullYear(), today.getMonth(), today.getDate()); // clear time
		// build the calendar HTML
		var controls = '<div class="calendar_control">' +
			'<a class="calendar_clear" onclick="popUpCal._clearDate(' + this._id + ');">' +
			this._get('clearText') + '</a>' +
			'<a class="calendar_close" onclick="popUpCal.hideCalendar(' + this._id + ');">' +
			this._get('closeText') + '</a></div>';
		var prompt = this._get('prompt');
		var closeAtTop = this._get('closeAtTop');
		var hideIfNoPrevNext = this._get('hideIfNoPrevNext');
		// controls and links
		var html = (prompt ? '<div class="calendar_prompt">' + prompt + '</div>' : '') +
			(closeAtTop && !this._inline ? controls : '') + '<div class="calendar_links">' +
			(this._canAdjustMonth(-1) ? '<a class="calendar_prev" ' +
			'onclick="popUpCal._adjustDate(' + this._id + ', -1, \'M\');">' + this._get('prevText') + '</a>' :
			(hideIfNoPrevNext ? '' : '<label class="calendar_prev">' + this._get('prevText') + '</label>')) +
			(this._isInRange(today) ? '<a class="calendar_current" ' +
			'onclick="popUpCal._gotoToday(' + this._id + ');">' + this._get('currentText') + '</a>' : '') +
			(this._canAdjustMonth(+1) ? '<a class="calendar_next" ' +
			'onclick="popUpCal._adjustDate(' + this._id + ', +1, \'M\');">' + this._get('nextText') + '</a>' :
			(hideIfNoPrevNext ? '' : '<label class="calendar_next">' + this._get('nextText') + '</label>')) +
			'</div><div class="calendar_header">';
		var minDate = this._get('minDate');
		var maxDate = this._get('maxDate');
		// month selection
		var monthNames = this._get('monthNames');
		if (!this._get('changeMonth')) {
			html += monthNames[this._selectedMonth] + '&nbsp;';
		}
		else {
			var inMinYear = (minDate && minDate.getFullYear() == this._selectedYear);
			var inMaxYear = (maxDate && maxDate.getFullYear() == this._selectedYear);
			html += '<select class="calendar_newMonth" ' +
				'onchange="popUpCal._selectMonthYear(' + this._id + ', this, \'M\');" ' +
				'onclick="popUpCal._clickMonthYear(' + this._id + ');">';
			for (var month = 0; month < 12; month++) {
				if ((!inMinYear || month >= minDate.getMonth()) &&
						(!inMaxYear || month <= maxDate.getMonth())) {
					html += '<option value="' + month + '"' +
						(month == this._selectedMonth ? ' selected="selected"' : '') +
						'>' + monthNames[month] + '</option>';
				}
			}
			html += '</select>';
		}
		// year selection
		if (!this._get('changeYear')) {
			html += this._selectedYear;
		}
		else {
			// determine range of years to display
			var years = this._get('yearRange').split(':');
			var year = 0;
			var endYear = 0;
			if (years.length != 2) {
				year = this._selectedYear - 10;
				endYear = this._selectedYear + 10;
			}
			else if (years[0].charAt(0) == '+' || years[0].charAt(0) == '-') {
				year = this._selectedYear + parseInt(years[0], 10);
				endYear = this._selectedYear + parseInt(years[1], 10);
			}
			else {
				year = parseInt(years[0], 10);
				endYear = parseInt(years[1], 10);
			}
			year = (minDate ? Math.max(year, minDate.getFullYear()) : year);
			endYear = (maxDate ? Math.min(endYear, maxDate.getFullYear()) : endYear);
			html += '<select class="calendar_newYear" onchange="popUpCal._selectMonthYear(' +
				this._id + ', this, \'Y\');" ' + 'onclick="popUpCal._clickMonthYear(' +
				this._id + ');">';
			for (; year <= endYear; year++) {
				html += '<option value="' + year + '"' +
					(year == this._selectedYear ? ' selected="selected"' : '') +
					'>' + year + '</option>';
			}
			html += '</select>';
		}
		html += '</div><table class="calendar" cellpadding="0" cellspacing="0"><thead>' +
			'<tr class="calendar_titleRow">';
		var firstDay = this._get('firstDay');
		var changeFirstDay = this._get('changeFirstDay');
		var dayNames = this._get('dayNames');
		for (var dow = 0; dow < 7; dow++) { // days of the week
			html += '<td>' + (!changeFirstDay ? '' : '<a onclick="popUpCal._changeFirstDay(' +
				this._id + ', this);">') + dayNames[(dow + firstDay) % 7] +
				(changeFirstDay ? '</a>' : '') + '</td>';
		}
		html += '</tr></thead><tbody>';
		var daysInMonth = this._getDaysInMonth(this._selectedYear, this._selectedMonth);
		this._selectedDay = Math.min(this._selectedDay, daysInMonth);
		var leadDays = (this._getFirstDayOfMonth(this._selectedYear, this._selectedMonth) - firstDay + 7) % 7;
		var currentDate = new Date(this._currentYear, this._currentMonth, this._currentDay);
		var selectedDate = new Date(this._selectedYear, this._selectedMonth, this._selectedDay);
		var printDate = new Date(this._selectedYear, this._selectedMonth, 1 - leadDays);
		var numRows = Math.ceil((leadDays + daysInMonth) / 7); // calculate the number of rows to generate
		var customDate = this._get('customDate');
		var showOtherMonths = this._get('showOtherMonths');
		for (var row = 0; row < numRows; row++) { // create calendar rows
			html += '<tr class="calendar_daysRow">';
			for (var dow = 0; dow < 7; dow++) { // create calendar days
				var customSettings = (customDate ? customDate(printDate) : [true, '']);
				var otherMonth = (printDate.getMonth() != this._selectedMonth);
				var unselectable = otherMonth || !customSettings[0] ||
					(minDate && printDate < minDate) || (maxDate && printDate > maxDate);
				html += '<td class="calendar_daysCell' +
					((dow + firstDay + 6) % 7 >= 5 ? ' calendar_weekEndCell' : '') + // highlight weekends
					(otherMonth ? ' calendar_otherMonth' : '') + // highlight days from other months
					//(printDate.getTime() == selectedDate.getTime() ? ' calendar_daysCellOver' : '') + // highlight selected day
					(unselectable ? ' calendar_unselectable' : '') +  // highlight unselectable days
					(!otherMonth || showOtherMonths ? ' ' + customSettings[1] : '') + // highlight custom dates
					(printDate.getTime() == currentDate.getTime() ? ' calendar_currentDay' : // highlight current day
					(printDate.getTime() == today.getTime() ? ' calendar_today' : '')) + '"' + // highlight today (if different)
					(unselectable ? '' : ' onmouseover="$(this).addClass(\'calendar_daysCellOver\');"' +
					' onmouseout="$(this).removeClass(\'calendar_daysCellOver\');"' +
					' onclick="popUpCal._selectDay(' + this._id + ', this);"') + '>' + // actions
					(otherMonth ? (showOtherMonths ? printDate.getDate() : '&nbsp;') : // display for other months
					(unselectable ? printDate.getDate() : '<a>' + printDate.getDate() + '</a>')) + '</td>'; // display for this month
				printDate.setDate(printDate.getDate() + 1);
			}
			html += '</tr>';
		}
		html += '</tbody></table>' + (!closeAtTop && !this._inline ? controls : '') +
			'<div style="clear: both;"></div>' + (!$.browser.msie ? '' :
			'<!--[if lte IE 6.5]><iframe src="javascript:false;" class="calendar_cover"></iframe><![endif]-->');
		return html;
	},

	/* Adjust one of the date sub-fields. */
	_adjustDate: function(offset, period) {
		var date = new Date(this._selectedYear + (period == 'Y' ? offset : 0),
			this._selectedMonth + (period == 'M' ? offset : 0),
			this._selectedDay + (period == 'D' ? offset : 0));
		// ensure it is within the bounds set
		var minDate = this._get('minDate');
		var maxDate = this._get('maxDate');
		date = (minDate && date < minDate ? minDate : date);
		date = (maxDate && date > maxDate ? maxDate : date);
		this._selectedDay = date.getDate();
		this._selectedMonth = date.getMonth();
		this._selectedYear = date.getFullYear();
	},

	/* Find the number of days in a given month. */
	_getDaysInMonth: function(year, month) {
		return 32 - new Date(year, month, 32).getDate();
	},

	/* Find the day of the week of the first of a month. */
	_getFirstDayOfMonth: function(year, month) {
		return new Date(year, month, 1).getDay();
	},

	/* Determines if we should allow a "next/prev" month display change. */
	_canAdjustMonth: function(offset) {
		var date = new Date(this._selectedYear, this._selectedMonth + offset, 1);
		if (offset < 0) {
			date.setDate(this._getDaysInMonth(date.getFullYear(), date.getMonth()));
		}
		return this._isInRange(date);
	},

	/* Is the given date in the accepted range? */
	_isInRange: function(date) {
		var minDate = this._get('minDate');
		var maxDate = this._get('maxDate');
		return ((!minDate || date >= minDate) && (!maxDate || date <= maxDate));
	},

	/* Format the given date for display. */
	_formatDate: function() {
		var day = this._currentDay = this._selectedDay;
		var month = this._currentMonth = this._selectedMonth;
		var year = this._currentYear = this._selectedYear;
		month++; // adjust javascript month
		var dateFormat = this._get('dateFormat');
		var dateString = '';
		for (var i = 0; i < 3; i++) {
			dateString += dateFormat.charAt(3) +
				(dateFormat.charAt(i) == 'D' ? (day < 10 ? '0' : '') + day :
				(dateFormat.charAt(i) == 'M' ? (month < 10 ? '0' : '') + month :
				(dateFormat.charAt(i) == 'Y' ? year : '?')));
		}
		return dateString.substring(dateFormat.charAt(3) ? 1 : 0);
	}
});

/* Attach the calendar to a jQuery selection.
   @param  settings  object - the new settings to use for this calendar instance (anonymous)
   @return jQuery object - for chaining further calls */
$.fn.calendar = function(settings, defaultDate) {
	return this.each(function() {
		// check for settings on the control itself - in namespace 'cal:'
		var inlineSettings = null;
		for (attrName in popUpCal._defaults) {
			var attrValue = this.getAttribute('cal:' + attrName);
			if (attrValue) {
				inlineSettings = inlineSettings || {};
				try {
					inlineSettings[attrName] = eval(attrValue);
				}
				catch (err) {
					inlineSettings[attrName] = attrValue;
				}
			}
		}
		var nodeName = this.nodeName.toLowerCase();
		if (nodeName == 'input') {
			var instSettings = (inlineSettings ? $.extend($.extend({}, settings || {}),
				inlineSettings || {}) : settings); // clone and customise
			var inst = (inst && !inlineSettings ? inst :
				new PopUpCalInstance(instSettings, false, defaultDate));
			popUpCal._connectCalendar(this, inst);
		} 
		else if (nodeName == 'div' || nodeName == 'span') {
			var instSettings = $.extend($.extend({}, settings || {}),
				inlineSettings || {}); // clone and customise
			var inst = new PopUpCalInstance(instSettings, true, defaultDate);
			popUpCal._inlineCalendar(this, inst, defaultDate);
		}
	});
};

/* Initialise the calendar. */
$(document).ready(function() {
   popUpCal = new PopUpCal(); // singleton instance
});