MediaWiki:Gadget-countdown-timer.js

$(function() {
	
	var timers = [];
	
	function tickTimer(timer) {
		var time = Math.floor((timer.expiration - Date.now()) / 1000);
		
		var s = time % 60;
		var m = Math.floor(time / 60) % 60;
		var h = Math.floor(time / 3600) % 24;
		var d = Math.floor(time / 86400);
		
		var text = '';
		
		var showUnit = d > 0;
		if (showUnit) {
			text += d + 'd';
		}
		
		showUnit |= h > 0;
		if (showUnit) {
			text += h + 'h';
		}
		
		showUnit |= m > 0;
		if (showUnit) {
			text += m + 'm';
		}
		
		showUnit |= s > 0;
		if (showUnit) {
			text += s + 's';
		}
		
		timer.$elem.text(text);
		
		return time > 0;
	}
	
	function tick() {
		// Tick and automatically remove expired timers.
		timers = timers.filter(function(timer) {
			return tickTimer(timer);
		});
		
		// Stop ticking if there are no timers remaining.
		if (timers.length != 0) {
			setTimeout(tick, 1000);
		}
	}
	
	mw.hook('wikipage.content').add(function($content) {
		var $targets = $content.find('time.countdown-timer:not(.managed)');
		if ($targets.length == 0) {
			return;
		}
		
		$targets
			.addClass('managed')
			.each(function() {
				console.log('FOUND TIMER!');
				timers.push({
					$elem: $(this),
					expiration: Date.now() + (90 * 1000)
				});
			});
			
		tick();
	});
});