jquery-calendar.js

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/* jQuery Calendar v2.7
   Written by Marc Grabanski ([e-mail]) and enhanced by Keith Wood ([e-mail]).

   Copyright (c) 2007 Marc Grabanski (http://marcgrabanski.com/code/jquery-calendar)
   Dual licensed under the GPL (http://www.gnu.org/licenses/gpl-3.0.txt) and 
   CC (http://creativecommons.org/licenses/by/3.0/) licenses. "Share or Remix it but please Attribute the authors."
   Date: 09-03-2007  */

/* PopUp Calendar manager.
   Use the singleton instance of this class, popUpCal, to interact with the calendar.
   Settings for (groups of) calendars are maintained in an instance object
   (PopUpCalInstance), allowing multiple different settings on the same page. */
function PopUpCal() {
	this._nextId = 0; // Next ID for a calendar instance
	this._inst = []; // List of instances indexed by ID
	this._curInst = null; // The current instance in use
	this._disabledInputs = []; // List of calendar inputs that have been disabled
	this._popUpShowing = false; // True if the popup calendar is showing , false if not
	this._inDialog = false; // True if showing within a "dialog", false if not
	this.regional = []; // Available regional settings, indexed by language code
	this.regional[''] = { // Default regional settings
		clearText: 'Clear', // Display text for clear link
		closeText: 'Close', // Display text for close link
		prevText: '<Prev', // Display text for previous month link
		nextText: 'Next>', // Display text for next month link
		currentText: 'Today', // Display text for current month link
		dayNames: ['Su','Mo','Tu','We','Th','Fr','Sa'], // Names of days starting at Sunday
		monthNames: ['January','February','March','April','May','June',
			'July','August','September','October','November','December'], // Names of months
		dateFormat: 'DMY/' // First three are day, month, year in the required order,
			// fourth (optional) is the separator, e.g. US would be 'MDY/', ISO would be 'YMD-'
	};
	this._defaults = { // Global defaults for all the calendar instances
		autoPopUp: 'focus', // 'focus' for popup on focus,
			// 'button' for trigger button, or 'both' for either
		appendText: '', // Display text following the input box, e.g. showing the format
		buttonText: '...', // Text for trigger button
		buttonImage: '', // URL for trigger button image
		buttonImageOnly: false, // True if the image appears alone, false if it appears on a button
		closeAtTop: true, // True to have the clear/close at the top,
			// false to have them at the bottom
		hideIfNoPrevNext: false, // True to hide next/previous month links
			// if not applicable, false to just disable them
		changeMonth: true, // True if month can be selected directly, false if only prev/next
		changeYear: true, // True if year can be selected directly, false if only prev/next
		yearRange: '-10:+10', // Range of years to display in drop-down,
			// either relative to current year (-nn:+nn) or absolute (nnnn:nnnn)
		firstDay: 0, // The first day of the week, Sun = 0, Mon = 1, ...
		changeFirstDay: true, // True to click on day name to change, false to remain as set
		showOtherMonths: false, // True to show dates in other months, false to leave blank
		minDate: null, // The earliest selectable date, or null for no limit
		maxDate: null, // The latest selectable date, or null for no limit
		speed: 'medium', // Speed of display/closure
		customDate: null, // Function that takes a date and returns an array with
			// [0] = true if selectable, false if not,
			// [1] = custom CSS class name(s) or '', e.g. popUpCal.noWeekends
		fieldSettings: null, // Function that takes an input field and
			// returns a set of custom settings for the calendar
		onSelect: null // Define a callback function when a date is selected
	};
	$.extend(this._defaults, this.regional['']);
	this._calendarDiv = $('<div id="calendar_div"></div>');
	$(document.body).append(this._calendarDiv);
	$(document.body).mousedown(this._checkExternalClick);
}

$.extend(PopUpCal.prototype, {
	/* Register a new calendar instance - with custom settings. */
	_register: function(inst) {
		var id = this._nextId++;
		this._inst[id] = inst;
		return id;
	},

	/* Retrieve a particular calendar instance based on its ID. */
	_getInst: function(id) {
		return this._inst[id] || id;
	},

	/* Override the default settings for all instances of the calendar. 
	   @param  settings  object - the new settings to use as defaults (anonymous object)
	   @return void */
	setDefaults: function(settings) {
		$.extend(this._defaults, settings || {});
	},

	/* Handle keystrokes. */
	_doKeyDown: function(e) {
		var inst = popUpCal._getInst(this._calId);
		if (popUpCal._popUpShowing) {
			switch (e.keyCode) {
				case 9:  popUpCal.hideCalendar(inst, '');
						break; // hide on tab out
				case 13: popUpCal._selectDate(inst);
						break; // select the value on enter
				case 27: popUpCal.hideCalendar(inst, inst._get('speed'));
						break; // hide on escape
				case 33: popUpCal._adjustDate(inst, -1, (e.ctrlKey ? 'Y' : 'M'));
						break; // previous month/year on page up/+ ctrl
				case 34: popUpCal._adjustDate(inst, +1, (e.ctrlKey ? 'Y' : 'M'));
						break; // next month/year on page down/+ ctrl
				case 35: if (e.ctrlKey) popUpCal._clearDate(inst);
						break; // clear on ctrl+end
				case 36: if (e.ctrlKey) popUpCal._gotoToday(inst);
						break; // current on ctrl+home
				case 37: if (e.ctrlKey) popUpCal._adjustDate(inst, -1, 'D');
						break; // -1 day on ctrl+left
				case 38: if (e.ctrlKey) popUpCal._adjustDate(inst, -7, 'D');
						break; // -1 week on ctrl+up
				case 39: if (e.ctrlKey) popUpCal._adjustDate(inst, +1, 'D');
						break; // +1 day on ctrl+right
				case 40: if (e.ctrlKey) popUpCal._adjustDate(inst, +7, 'D');
						break; // +1 week on ctrl+down
			}
		}
		else if (e.keyCode == 36 && e.ctrlKey) { // display the calendar on ctrl+home
			popUpCal.showFor(this);
		}
	},

	/* Filter entered characters. */
	_doKeyPress: function(e) {
		var inst = popUpCal._getInst(this._calId);
		var chr = String.fromCharCode(e.charCode == undefined ? e.keyCode : e.charCode);
		return (chr < ' ' || chr == inst._get('dateFormat').charAt(3) ||
			(chr >= '0' && chr <= '9')); // only allow numbers and separator
	},

	/* Attach the calendar to an input field. */
	_connectCalendar: function(target, inst) {
		var $input = $(target);
		var appendText = inst._get('appendText');
		if (appendText) {
			$input.after('<span class="calendar_append">' + appendText + '</span>');
		}
		var autoPopUp = inst._get('autoPopUp');
		if (autoPopUp == 'focus' || autoPopUp == 'both') { // pop-up calendar when in the marked field
			$input.focus(this.showFor);
		}
		if (autoPopUp == 'button' || autoPopUp == 'both') { // pop-up calendar when button clicked
			var buttonText = inst._get('buttonText');
			var buttonImage = inst._get('buttonImage');
			var buttonImageOnly = inst._get('buttonImageOnly');
			var trigger = $(buttonImageOnly ? '<img class="calendar_trigger" src="' +
				buttonImage + '" alt="' + buttonText + '" title="' + buttonText + '"/>' :
				'<button type="button" class="calendar_trigger">' + (buttonImage != '' ?
				'<img src="' + buttonImage + '" alt="' + buttonText + '" title="' + buttonText + '"/>' :
				buttonText) + '</button>');
			$input.wrap('<span class="calendar_wrap"></span>').after(trigger);
			trigger.click(this.showFor);
		}
		$input.keydown(this._doKeyDown).keypress(this._doKeyPress);
		$input[0]._calId = inst._id;
	},

	/* Attach an inline calendar to a div. */
	_inlineCalendar: function(target, inst, defaultDate) {
		$(target).append(inst._calendarDiv);
		target._calId = inst._id;
		var date = defaultDate;
		inst._selectedDay = date.getDate();
		inst._selectedMonth = date.getMonth();
		inst._selectedYear = date.getFullYear();
		popUpCal._adjustDate(inst);
	},

	/* Pop-up the calendar in a "dialog" box.
	   @param  dateText  string - the initial date to display (in the current format)
	   @param  onSelect  function - the function(dateText) to call when a date is selected
	   @param  settings  object - update the dialog calendar instance's settings (anonymous object)
	   @param  pos       int[2] - coordinates for the dialog's position within the screen
			leave empty for default (screen centre)
	   @return void */
	dialogCalendar: function(dateText, onSelect, settings, pos) {
		var inst = this._dialogInst; // internal instance
		if (!inst) {
			inst = this._dialogInst = new PopUpCalInstance({}, false);
			this._dialogInput = $('<input type="text" size="1" style="position: absolute; top: -100px;"/>');
			this._dialogInput.keydown(this._doKeyDown);
			$('body').append(this._dialogInput);
			this._dialogInput[0]._calId = inst._id;
		}
		$.extend(inst._settings, settings || {});
		this._dialogInput.val(dateText);
		
		/*	Cross Browser Positioning */
		if (self.innerHeight) { // all except Explorer
			windowWidth = self.innerWidth;
			windowHeight = self.innerHeight;
		} else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
			windowWidth = document.documentElement.clientWidth;
			windowHeight = document.documentElement.clientHeight;
		} else if (document.body) { // other Explorers
			windowWidth = document.body.clientWidth;
			windowHeight = document.body.clientHeight;
		} 
		this._pos = pos || // should use actual width/height below
			[(windowWidth / 2) - 100, (windowHeight / 2) - 100];

		// move input on screen for focus, but hidden behind dialog
		this._dialogInput.css('left', this._pos[0] + 'px').css('top', this._pos[1] + 'px');
		inst._settings.onSelect = onSelect;
		this._inDialog = true;
		this._calendarDiv.addClass('calendar_dialog');
		this.showFor(this._dialogInput[0]);
		if ($.blockUI) {
			$.blockUI(this._calendarDiv);
		}
	},

	/* Enable the input field(s) for entry.
	   @param  inputs  element/object - single input field or jQuery collection of input fields
	   @return void */
	enableFor: function(inputs) {
		inputs = (inputs.jquery ? inputs : $(inputs));
		inputs.each(function() {
			this.disabled = false;
			$('../button.calendar_trigger', this).each(function() { this.disabled = false; });
			$('../img.calendar_trigger',
this).css({opacity:'1.0',cursor:''});
			var $this = this;
			popUpCal._disabledInputs = $.map(popUpCal._disabledInputs,
				function(value) { return (value == $this ? null : value); }); // delete entry
		});
	},

	/* Disable the input field(s) from entry.
	   @param  inputs  element/object - single input field or jQuery collection of input fields
	   @return void */
	disableFor: function(inputs) {
		inputs = (inputs.jquery ? inputs : $(inputs));
		inputs.each(function() {
			this.disabled = true;
			$('../button.calendar_trigger', this).each(function() { this.disabled = true; });
			$('../img.calendar_trigger', this).css({opacity:'0.5',cursor:'default'});
			var $this = this;
			popUpCal._disabledInputs = $.map(popUpCal._disabledInputs,
				function(value) { return (value == $this ? null : value); }); // delete entry
			popUpCal._disabledInputs[popUpCal._disabledInputs.length] = this;
		});
	},

	/* Update the settings for a calendar attached to an input field or division.
	   @param  control   element - the input field or div/span attached to the calendar
	   @param  settings  object - the new settings to update
	   @return void */
	reconfigureFor: function(control, settings) {
		var inst = this._getInst(control._calId);
		if (inst) {
			$.extend(inst._settings, settings || {});
			this._updateCalendar(inst);
		}
	},

	/* Set the date for a calendar attached to an input field or division.
	   @param  control  element - the input field or div/span attached to the calendar
	   @param  date     Date - the new date
	   @return void */
	setDateFor: function(control, date) {
		var inst = this._getInst(control._calId);
		if (inst) {
			inst._setDate(date);
		}
	},

	/* Retrieve the date for a calendar attached to an input field or division.
	   @param  control  element - the input field or div/span attached to the calendar
	   @return Date - the current date */
	getDateFor: function(control) {
		var inst = this._getInst(control._calId);
		return (inst ? inst._getDate() : null);
	},