https://du.ac.bd/fontView/assets/js/count-to.js

1(function ($) {
2	$.fn.countTo = function (options) {
3		options = options || {};
4		
5		return $(this).each(function () {
6			// set options for current element
7			var settings = $.extend({}, $.fn.countTo.defaults, {
8				from:            $(this).data('from'),
9				to:              $(this).data('to'),
10				speed:           $(this).data('speed'),
11				refreshInterval: $(this).data('refresh-interval'),
12				decimals:        $(this).data('decimals')
13			}, options);
14			
15			// how many times to update the value, and how much to increment the value on each update
16			var loops = Math.ceil(settings.speed / settings.refreshInterval),
17				increment = (settings.to - settings.from) / loops;
18			
19			// references & variables that will change with each update
20			var self = this,
21				$self = $(this),
22				loopCount = 0,
23				value = settings.from,
24				data = $self.data('countTo') || {};
25			
26			$self.data('countTo', data);
27			
28			// if an existing interval can be found, clear it first
29			if (data.interval) {
30				clearInterval(data.interval);
31			}
32			data.interval = setInterval(updateTimer, settings.refreshInterval);
33			
34			// initialize the element with the starting value
35			render(value);
36			
37			function updateTimer() {
38				value += increment;
39				loopCount++;
40				
41				render(value);
42				

43				if (typeof(settings.onUpdate) == 'function') {
44					settings.onUpdate.call(self, value);
45				}
46				
47				if (loopCount >= loops) {
48					// remove the interval
49					$self.removeData('countTo');
50					clearInterval(data.interval);
51					value = settings.to;
52					
53					if (typeof(settings.onComplete) == 'function') {
54						settings.onComplete.call(self, value);
55					}
56				}
57			}
58			
59			function render(value) {
60				var formattedValue = settings.formatter.call(self, value, settings);
61				$self.html(formattedValue);
62			}
63		});
64	};
65	
66	$.fn.countTo.defaults = {
67		from: 0,               // the number the element should start at
68		to: 0,                 // the number the element should end at
69		speed: 1000,           // how long it should take to count between the target numbers
70		refreshInterval: 100,  // how often the element should be updated
71		decimals: 0,           // the number of decimal places to show
72		formatter: formatter,  // handler for formatting the value before rendering
73		onUpdate: null,        // callback method for every time the element is updated
74		onComplete: null       // callback method for when the element finishes updating
75	};
76	
77	function formatter(value, settings) {
78		return value.toFixed(settings.decimals);
79	}
80}(jQuery));