Javascript Advanced Calendar Script (JACS) by Anthony Garrett

Description	Praise	About Demo	Live Demo	How to...	Download	LGPL License	Versions

Warning: Your browser has JavaScript disabled

JavaScript must be enabled for this calendar demonstration to work.

Description

This flexible pop-up calendar is written to work across browsers. It's fully commented and is easily customisable for language, colours and date format.

Features include flexible week numbering, multiple calendars on the page, static and dynamic calendars, date disabling and enabling, time selection and coder-defined function execution after calendar use.

The display shows a month at a time from a specified range of years. The optional input date determines the initial month displayed. The year can be in two or four digits while the month can be digits or a month name (easily be set up for any language). Any date or day of the week can be disabled (and re-enabled) using JavaScript on the calling page. This is ideal for combination with server-side technologies to produce a professional application.

Features

Easily customised for output date format, colours, language, and year range.
Accepts a date as input.
You choose the first day of the week for the display.
You can invoke any number of both static and dynamic calendars.
You can disable specified week days, dates and date ranges or invert that behaviour to enable only those you specify.
Week numbering can be displayed.
Allows dynamic control of calendar attributes.
Calendar position can be specified relative to the page or relative to the element the calendar is based on.
Optionally draggable.

Tested against:

Firefox 0.9.1+ (& Netscape 8.0.4+ & Flock 0.4.9)	Internet Explorer 6.0.28+
Opera 7.52+	Mozilla 1.7.1
Konqueror 4.0.1	Safari (for Windows)

Known issues

No current bugs

Working with Applets and Objects
This script is designed to be as robust as possible. However, in many implementations the canvas for objects and applets is not drawn by the browser. If the object/applet is refreshed it will overwrite anything displayed in the same location, including the calendar. There is no way to prevent this issue in JavaScript. If you wish to use both dynamic objects and the calendar on the same page then the only option is to position them carefully so that they cannot overlap.

Rights and Responsibilities

This script is published under the GNU Lesser General Public License. The License gives you wide-ranging rights to use the script. Please read it to ensure that your use of the script falls within your rights. if you have any questions or requests in relation to the license.
I am also happy to discuss licensing if you wish to use the script outside the terms of the GNU LGPL.
If you speak a language that isn't in this demonstration already, you could .
Of course, I want to know of any faults you might discover.
If you would like a new feature that might suit a wider audience, . I like a challenge so all ideas are welcome.
I spend a lot of time developing this just because I enjoy it. However, I have costs keeping it available and need to repay my family for all those hours hacking the code by taking them out for a meal once in a blue moon so, any and all donations are welcome.

Contact

I can't offer formal support for this but if you find a problem (or just want to tell me how much you like the script), please .

I will try to fix problems and deliver improvements quickly but this is a spare time thing for me (if it wasn't, it wouldn't be free! Smile. Fair's fair!

Credits

This script is based on my Simple Calendar Widget script which I wrote from scratch myself but I couldn't have done either without the superb "JavaScript The Definitive Guide" by David Flanagan (Pub. O'Reilly ISBN 0-596-00048-0) and Peter-Paul Koch's (PPK) brilliant Quirksmode site. I am very grateful to those users who have given their time to let me know their ideas and enhancements. When I use those, individuals are credited in the script.

Link back

If your use of the script allows, please give me credit and link back to my page. Your links will help the script to gain and keep a good ranking with search engines. Please add the following HTML to any indexed page on your web site:

     <A HREF='http://www.tarrget.info/calendar/jacs.htm'>
         Javascript Advanced Calendar Script (JACS)
    </A> by Anthony Garrett

Some selected feedback about JACS
See praise for SCW for comments about this calendar's predecessor.
"I've come across your JACS Calendar on the Internet, and would like to say it's one of the most solid calendars I've seen out there! The set of features, level of customization and cross-browser functionality are just outstanding!" - Sergey, 19 Jul 2007
"Your calendar script works perfectly and looks great!" - Rogier, 18 Jun 2007
"That’s a great calendar script. Well done mate!!" - Imran, 24 May 2007
.

About the Demo

Explanation

The examples demonstrate some ways of using the calendar. I don't recommend any one method, but I do suggest that you avoid using the roll-over as a few minutes trying it out on this page will prove how annoying it (and roll-overs in general) can be.

All of the options can be set for each calendar you display but there are also default values that you can easily configure.

This demonstration uses only one dynamic calendar and two static calendars but you can have as many as you like.

The strict date processing option:

If a day portion of a date is entered, it is validated and must be between 1 and 31 inclusive.

With the "strict" option turned on, the script generates an error for dates that are invalid in a specific month (e.g. 31 April). The calendar is then opened on the selected month but without a day selected.

With it turned off, no error is generated and the calendar will open the following month with a day selected (e.g. entering 31 April would select 1 May, i.e. 30 April + 1 day).

Normally you just decide which you will use and set it in the script but for this demo I have provided a button to let you try both options.

The on-calendar click to hide option:

The very earliest versions of SCW (this calendar's predecessor) did not allow a click on the calling page to close the calendar (the technique was to click on a dead space within the calendar).

Since adding that feature I have left the original method in place. From version 2.4 of SCW this became optional and this behaviour is turned off by default.

Calendar dragging:

You can allow the calendar to be dragged around the screen. As with strict date processing, there is a button for you to try out the calendar with dragging turned on or off.

Week Numbering:

Week numbers can be displayed. The script, as supplied, defines a year's first week using two factors; The day that starts the week and, the day of the week that has to be in the current year (I call the second factor, the Base day). In the script, the day that starts the week for numbering purposes is always the same as the first day displayed (this prevents two week numbers from appearing on one line).

This complies with ISO 8601 which states that Monday is the start of the week and Thursday is the Base day, consequently this is how the script is set initially. However, as this script already allows you to choose the week's start day (and Company rules may vary widely), you can choose the Base day.

There are so many different rules that can define the first week of the year that it is impossible to allow for all possibilities. The script calculates each week's number in a function (weekNumber) so, if you have different rules to apply, you can modify that function and so use the script's week number display.

As with Strict dates and Dragging, this demonstration allows you to turn the week display on and off. The Base day and Week start day can also be chosen. In normal use all of these would simply be set in the script.

Setting Dates:

By default setting a date by any of the methods available with the script will disable it (with all other dates enabled), however the calendar can be set to invert that behaviour and enable only those dates set.

This demonstration page shows date setting in action and allows you to try out the day-of-the-week enabling and disabling.

Several dates are set for each example. They are; 14^th of this month, the range 28^th of this - 4^th of next month and Good Friday and Easter Monday of each year (based on a JavaScript calculation of Easter Day that you might find useful, right-click here and save to download all the functions for this demonstration page).

You can use optional arguments to the entry routine (JACS.show) to make setting days of the week for an individual input field extra easy. See the description in the 'How to' section. Wednesday is set in one of the demonstration inputs (the one that starts with the value 'feb,98') using this method.

The "Today" selector (below the month display) is controlled (enabled or disabled) by the script when the current day is set by date (individually or in a range) and by day when you use the JACS.show arguments method.

Highlighting Dates:

Dates are highlighted in exactly the same way as the default method for setting individual dates and dates ranges described above.

This feature is not demonstrated on this site but it is documented in full in the script (as all other features are).

Language selection:

The language-dependent parts of the calendar are set when the calendar is made visible so you can dynamically choose the calendar language without refreshing the page.

The demo allows you to choose English and some languages that contributors have kindly sent to me. Right-click here and select your browser's "Save" option to downloaded them. If you would like to add your own language to the list then to me.

Note that on this demo page, the language setting applies only to the calendar, not the rest of the demo.

Browser Bug Warnings for this page:

Safari 3 Beta for Windows returns null values for properties of a computed style when an element is hidden using display='none' (either explicitly or by inheritance). Last tested on 3.0.2 (522.13.1).

This is an improvement in Safari's behaviour (it only started supporting getComputedStyle at all recently) however, they haven't got it right yet.

The practical result of this is that my demonstration page (which starts with the Live Demo in a DIV hidden with display='none') displays static calendars with the wrong cell borders initially. Selecting a date will correct the borders as the DIV is (obviously) no longer hidden, so Safari returns the correct computer style.

I have submitted this bug (probably one of many people to have done so) and now I can only wait for Safari to fix it.

I haven't fixed my demonstration pages by restructuring or using work-around techniques because I think it is better that you see this honestly here... Feel free to apply as much pressure as you think fit to get Apple to fix their bug.

Firefox 1.5 (I haven't checked older versions) loops when a text input box's onMouseOver event displays an alert that then overlays the input box. The problem was resolved in Firefox 1.6.

Consequently;	a)	please don't blame my code if you encounter this bug,
and	b)	there is even more reason not to code your page using roll-overs.

If you are fast with your fingers, you can stop the loop by cancelling all the alert boxes or by moving all the alert boxes away from the input box.

This bug also affects Flock 0.4.9.

When using DIVs with the float attribute and a BODY onClick event (as this page does) Opera versions prior to 9.02 (Build 8573) do not always trigger the event when they should.

How to...

How to add the calendar to your page

Download the script (jacs.js) from this page and place it somewhere in your site's directory/folder structure. This script needs to be defined for your page so add the following line;

where <<script location>> is the URI of the script, e.g. jacs.js if the script is in the same location as the page or /scripts/jacs.js if it is in a "scripts" sub-folder of the web site's root directory.

How to use the calendar once it is defined for your page

Dynamic calendar:

Simply choose an event to trigger the calendar (like an onclick or an onmouseover) and an element to work on (for the calendar to take its initial date from and write its output date to) then write it like this;

e.g.

onclick="JACS.show(document.getElementById('myElement'),event);"

onfocus="JACS.show(this,event);"

NOTE:

The "this" keyword does not work when the calendar is triggered using an anchor tag. The following syntax works;

<a href="#" onclick="JACS.show(<<element>>,event);return false;"> <<your text>> </a>

If you are using a text node then specify the text's parent node in the function call. The date should be the only text under that node;

e.g.

Static calendar:

JACS.show(<<element>>
<<,optional calendar ID>>
<<,optional disabled days>>);

A static calendar appears on screen when the page loads, cannot be dragged and remains on screen after it has been used to select a date. It returns the date into the value of a defined element (e.g. an INPUT element) but, of course, that can be hidden.

Calendar with selected days:

You can select days of the week by adding arguments to the call to JACS.show. These selected days can be the only ones enabled or the only ones disabled depending on the setting of the attribute valuesEnabled (see below). The values should be Sunday = 0 through to Saturday = 6. The parameters can be a series of single values or an array holding those values. A call to JACS.show with Friday and Monday selected could look something like this;

JACS.show(<<element>>,event,5,1);

or this;

var myArray = [5,1];
JACS.show(<<element>>,event,myArray);

Named calendar:

'jacs' is the default ID of the calendar but you can assign any ID you want e.g.

JACS.show(<<element>>,event,<<calendar ID>>);

You can call one name as many times as you like, but as it is one object, it can only appear on screen in one location at a time. If you want more than one calendar available on screen at a time then you must give different IDs.

Calendar with post-processing:

The following technique runs a function each time a dynamic calendar closes or a date is selected from a static calendar:

JACS.show(<<Dynamic or Static calendar argument list>>);
JACS.next(<<optional calendar ID,>><<function>><<,arguments>>);

Where <<function>> is a function defined on the calling page and <<arguments>> is the list of arguments being passed to that function.

The calendar ID defaults to 'jacs', if you are using a different calendar object (See calendar naming above), you must give its ID as the first argument.

NOTES:

These two calls are expected in this order (i.e. show before next) because JACS.next expects the calendar object to exist.

If JACS.make has not been called for the object and JACS.show is called after JACS.next then the calendar object may not exist (if the object has not been created earlier in the users path through the page) so a JavaScript error would be generated.

Every function that is triggered using JACS.next() acquires an attribute JACSid. This attribute holds the value of the calendar ID that JACS.next() has been called for. So, your function has access to all of the calendar instance's attributes including dateReturned (boolean TRUE if the calendar has been closed by selection of a date, otherwise FALSE).

E.G.	document.getElementById(<<function>>.JACSid). dateReturned

Disabling or enabling dates or date ranges:

Setting enabled or disabled date ranges for a calendar object is achieved by setting the dates array attribute of the calendar object (see more information below). By default the calendar object is only created when it is first needed for display so you should make sure that it is explicitly created using;

E.G.	JACS.make(<<calendar id>> <<,dynamic>>);

The dynamic argument is an optional boolean value and defaults to TRUE.

Combining the techniques:

A fully defined call to JACS.show, including all optional parameters should send parameters in the following order;

	I/O Element	Trigger Event	Calendar ID	Selected Days
Dynamic	0	1	2	2/3
Static	0		1	1/2
Static/ Dynamic	Both	Dynamic	Both	Both
Type	Object	Object	String	Number(s)
Required	Yes	See note below	No	No
Default	None	None	'jacs'	None

NOTE:

The Trigger Event is only relevant for dynamic calendars and must be omitted for static calendars.

e.g.

Dynamic	JACS.show(document.getElementById('myElement'), event,'jacs',0,1,2,3,4,5,6);
Static	JACS.show(document.getElementById('myElement2'), 'myCal2',0,6);

A single calendar instance must not be called with both Dynamic and Static parameters set because it is only one structure within the page so it cannot remain visible in one location while it is displayed in another.

Post-processing (described above) is not affected by the way the calendar is called.

Exposed calendar objects (functions):

JACS.make	Creates calendar objects; is called as part of JACS.show (if needed) but can also be called to create a calendar instance at any time.
JACS.show	Entry point for display of a calendar: Called in main page.
JACS.next	Sets up a function to run when a date is selected on a static calendar or a dynamic calendar closes.
JACS.cals	returns an array of all the calendar IDs that have been used on the page.
	NOTES:	1	"used" here means: Invoked with JACS.make or JACS.show. Calls without a defined calendar ID invoke the default ID, 'jacs'.
		2	Each calendar structure is added to the page when it is first used. So this array may not hold all dynamic calendar IDs that are defined on the page. If you want to be sure that the array does show all of them, explicitly invoke JACS.make(<<ID>>); for each ID on page load.

Download
Right click here and choose "Save Link/Target As..." to download the script.
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Version History
Version	Date	Changes
1.30	2008-05-05	Added optional auto-positioning of the calendar when its normal position would go off the visible area. Thanks to Chandramouli Iyer for this suggestion. Added an optional "Clear" button for use when handling a read-only text input element. Thanks to Sanjay Gangwal for his suggestion.
1.21	2008-04-11	Corrected the input month name parsing so that it set the calendar to the right month when long month names used. Thanks to Ben Diamand for this bug report.
1.20	2008-04-10	Added attribute to allow calendar to appear in "display" mode only (i.e. dates not selectable). Added the option to highlight specified dates and date ranges. Thanks to Ben Diamand for both suggestions.
1.11	2008-02-24	Trapped calls to script with only a NAME attribute is set for the target element when the script really requires an ID attribute. This is the most frequent mistake reported to me.
1.10	2008-01-14	Restored the ability to use an element as the second parameter when opening a dynamic calendar while retaining the option of passing an event. Thanks to Thierry Blind and Sergey Snovsky for the feedback. Added a calendar attribute that holds the returned date. This simplifies use of the calendar within JavaScript. Thanks to Juha Valvanne for the query that led to this enhancement. Fixed bug in the handling of focus events that caused calendar to fail to appear. Thanks to Steve Davis for reporting the problem.
1.00	2007-09-21	Fixed JACS.next parameters - thanks to Rogier Lankhorst for the feedback, also refined JACS.next processing. Updated the event trapping to make it less intrusive on the page body. NOTE: This requires that a dynamic calendar's second parameter should be the calling event (not the calling object as in SCW and the JACS Beta). Thanks to Steve Davis for the bug report that led to this change. Replaced the date input sequence user configuration setting with parsing the sequence from the full format. New users are often confused by the sequence and in practice (to allow the calendar's date output to be used for input) the sequence must always match the full format element order. Fixed a bug that caused undelimited dates to be handled incorrectly. They are now parsed against the full date output format then checked for validity. Thanks to Dan Wood for raising this bug. Fixed Standards-based (non IE) calendar dragging which wasn't releasing the calendar onmouseup. Fixed problem where selected weekdays carried over from one call to another on the same calendar object. Corrected the Month and Year select box displays in Opera. They were not changing when the month was shifted using the calendar's left and right arrows. Extended IFRAME backing to all calendar objects in order to improve calendar display over some embedded applets and objects. Thanks to Stanko Kupcevic for his feedback on this. NOTE: It is not possible to protect any JavaScript object displayed over an embedded DYNAMIC (and, therefore refreshed) object because browsers usually do not directly control the screen handling within the object. The best advice therefore remains to design pages in such a way that the calendar does not overlap embedded objects. Added curly braces and semi-colons for best practice and for robustness when code is compacted/obfuscated.
0.90	2007-04-04	Major Release: Complete ovehaul of internal structure implementing object-oriented techniques. Multiple calendar objects allowed on the page. Static calendars allowed. "showCal" legacy entry-point dropped. Added ability to select calendar position relative to return value element. Thanks to Justin Lawrence for that request.
		See the Simple Calendar Widget demonstration page for the history of JACS' predecessor.

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