81 lines
2.5 KiB
JavaScript
81 lines
2.5 KiB
JavaScript
(function ($) {
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$.fn.countTo = function (options) {
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options = options || {};
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return $(this).each(function () {
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// set options for current element
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var settings = $.extend({}, $.fn.countTo.defaults, {
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from: $(this).data('from'),
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to: $(this).data('to'),
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speed: $(this).data('speed'),
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refreshInterval: $(this).data('refresh-interval'),
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decimals: $(this).data('decimals')
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}, options);
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// how many times to update the value, and how much to increment the value on each update
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var loops = Math.ceil(settings.speed / settings.refreshInterval),
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increment = (settings.to - settings.from) / loops;
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// references & variables that will change with each update
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var self = this,
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$self = $(this),
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loopCount = 0,
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value = settings.from,
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data = $self.data('countTo') || {};
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$self.data('countTo', data);
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// if an existing interval can be found, clear it first
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if (data.interval) {
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clearInterval(data.interval);
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}
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data.interval = setInterval(updateTimer, settings.refreshInterval);
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// initialize the element with the starting value
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render(value);
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function updateTimer() {
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value += increment;
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loopCount++;
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render(value);
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if (typeof(settings.onUpdate) == 'function') {
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settings.onUpdate.call(self, value);
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}
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if (loopCount >= loops) {
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// remove the interval
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$self.removeData('countTo');
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clearInterval(data.interval);
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value = settings.to;
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if (typeof(settings.onComplete) == 'function') {
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settings.onComplete.call(self, value);
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}
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}
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}
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function render(value) {
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var formattedValue = settings.formatter.call(self, value, settings);
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$self.text(formattedValue);
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}
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});
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};
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$.fn.countTo.defaults = {
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from: 0, // the number the element should start at
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to: 0, // the number the element should end at
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speed: 1000, // how long it should take to count between the target numbers
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refreshInterval: 100, // how often the element should be updated
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decimals: 0, // the number of decimal places to show
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formatter: formatter, // handler for formatting the value before rendering
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onUpdate: null, // callback method for every time the element is updated
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onComplete: null // callback method for when the element finishes updating
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};
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function formatter(value, settings) {
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return value.toFixed(settings.decimals);
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}
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}(jQuery));
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