javascript-countdown

javascript-countdown.js

/**
* @project: Countdown timer
* @author: Max Calabrese
* A eval free version of Dejan Jacimovic´s http://stuntsnippets.com/javascript-countdown/
* 
* @licence:
* GNU / GPLv3
* You should have received a copy of the GNU General Public License
* If not, see <http://www.gnu.org/licenses/>.
*
* The Software shall be used for Good, not Evil.
**

var javascript_countdown = function () {
	
	var time_left = 10, //number of seconds for countdown
		output_element_id = 'javascript_countdown_time',
		keep_counting = 1,
		no_time_left_message = 'No time left for JavaScript countdown!';
 
	function countdown() {
		if(time_left < 2) {
			keep_counting = 0;
		}
 
		time_left = time_left - 1;
	}
 
	function add_leading_zero(n) {
		if(n.toString().length < 2) {
			return '0' + n;
		} else {
			return n;
		}
	}
 
	function format_output() {
		var hours, minutes, seconds;
		seconds = time_left % 60;
		minutes = Math.floor(time_left / 60) % 60;
		hours = Math.floor(time_left / 3600);
 
		seconds = add_leading_zero( seconds );
		minutes = add_leading_zero( minutes );
		hours = add_leading_zero( hours );
 
		return hours + ':' + minutes + ':' + seconds;
	}
 
	function show_time_left() {
		document.getElementById(output_element_id).innerHTML = format_output();//time_left;
	}
 
	function no_time_left() {
		document.getElementById(output_element_id).innerHTML = no_time_left_message;
	}
 
	return {
		count: function () {
			countdown();
			show_time_left();
		},
		timer: function () {
			javascript_countdown.count();
 
			if(keep_counting) {
				// Modified to get rid of evel
				setTimeout(function(){ javascript_countdown.timer(); }, 1000); 
			} else {
				no_time_left();
			}
		},
		//Kristian Messer requested recalculation of time that is left
		setTimeLeft: function (t) {
			time_left = t;
			if(keep_counting == 0) {
				javascript_countdown.timer();
			}
		},
		init: function (t, element_id) {
			time_left = t;
			output_element_id = element_id;
			javascript_countdown.timer();
		}
	};
}();
 
//time to countdown in seconds, and element ID
javascript_countdown.init(3673, 'javascript_countdown_time');