1"use strict"; 2(function ($) { 3 $.fn.countTo = function (options) { 4 options = options || {}; 5 6 return $(this).each(function () { 7 // set options for current element 8 var settings = $.extend({}, $.fn.countTo.defaults, { 9 from: $(this).data('from'), 10 to: $(this).data('to'), 11 speed: $(this).data('speed'), 12 refreshInterval: $(this).data('refresh-interval'), 13 decimals: $(this).data('decimals') 14 }, options); 15 16 // how many times to update the value, and how much to increment the value on each update 17 var loops = Math.ceil(settings.speed / settings.refreshInterval), 18 increment = (settings.to - settings.from) / loops; 19 20 // references & variables that will change with each update 21 var self = this, 22 $self = $(this), 23 loopCount = 0, 24 value = settings.from, 25 data = $self.data('countTo') || {}; 26 27 $self.data('countTo', data); 28 29 // if an existing interval can be found, clear it first 30 if (data.interval) { 31 clearInterval(data.interval); 32 } 33 data.interval = setInterval(updateTimer, settings.refreshInterval); 34 35 // initialize the element with the starting value 36 render(value); 37 38 function updateTimer() { 39 value += increment; 40 loopCount++; 41 42 render(value); 43
44 if (typeof(settings.onUpdate) == 'function') { 45 settings.onUpdate.call(self, value); 46 } 47 48 if (loopCount >= loops) { 49 // remove the interval 50 $self.removeData('countTo'); 51 clearInterval(data.interval); 52 value = settings.to; 53 54 if (typeof(settings.onComplete) == 'function') { 55 settings.onComplete.call(self, value); 56 } 57 } 58 } 59 60 function render(value) { 61 var formattedValue = settings.formatter.call(self, value, settings); 62 $self.text(formattedValue); 63 } 64 }); 65 }; 66 67 $.fn.countTo.defaults = { 68 from: 0, // the number the element should start at 69 to: 0, // the number the element should end at 70 speed: 1000, // how long it should take to count between the target numbers 71 refreshInterval: 100, // how often the element should be updated 72 decimals: 0, // the number of decimal places to show 73 formatter: formatter, // handler for formatting the value before rendering 74 onUpdate: null, // callback method for every time the element is updated 75 onComplete: null // callback method for when the element finishes updating 76 }; 77 78 function formatter(value, settings) { 79 return value.toFixed(settings.decimals); 80 } 81}(jQuery));
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