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(function (factory) {
if (typeof define === 'function' && define.amd) {
// AMD
define(['jquery'], factory);
} else if (typeof exports === 'object') {
// CommonJS
factory(require('jquery'));
} else {
// Browser globals
factory(jQuery);
}
}(function ($) {
var CountTo = function (element, options) {
this.$element = $(element);
this.options = $.extend({}, CountTo.DEFAULTS, this.dataOptions(), options);
this.init();
};
CountTo.DEFAULTS =
{
from: 0, // the number the element should start at
to: 0, // the number the element should end at
speed: 1000, // how long it should take to count between the target numbers
refreshInterval: 100, // how often the element should be updated
decimals: 0, // the number of decimal places to show
formatter: formatter, // handler for formatting the value before rendering
onUpdate: null, // callback method for every time the element is updated
onComplete: null // callback method for when the element finishes updating
};
CountTo.prototype.init = function () {
this.value = this.options.from;
this.loops = Math.ceil(this.options.speed / this.options.refreshInterval);
this.loopCount = 0;
this.increment = (this.options.to - this.options.from) / this.loops;
};
CountTo.prototype.dataOptions = function () {
var options = {
from: this.$element.data('from'),
to: this.$element.data('to'),
speed: this.$element.data('speed'),
refreshInterval: this.$element.data('refresh-interval'),
decimals: this.$element.data('decimals')
};
var keys = Object.keys(options);
for (var i in keys) {
var key = keys[i];
if (typeof(options[key]) === 'undefined') {
delete options[key];
}
}
return options;
};
CountTo.prototype.update = function () {
this.value += this.increment;
this.loopCount++;
this.render();
if (typeof(this.options.onUpdate) == 'function') {
this.options.onUpdate.call(this.$element, this.value);
}
if (this.loopCount >= this.loops) {
clearInterval(this.interval);
this.value = this.options.to;
if (typeof(this.options.onComplete) == 'function') {
this.options.onComplete.call(this.$element, this.value);
}
}
};
CountTo.prototype.render = function () {
var formattedValue = this.options.formatter.call(this.$element, this.value, this.options);
this.$element.text(formattedValue);
};
CountTo.prototype.restart = function () {
this.stop();
this.init();
this.start();
};
CountTo.prototype.start = function () {
this.stop();
this.render();
this.interval = setInterval(this.update.bind(this), this.options.refreshInterval);
};
CountTo.prototype.stop = function () {
if (this.interval) {
clearInterval(this.interval);
}
};
CountTo.prototype.toggle = function () {
if (this.interval) {
this.stop();
} else {
this.start();
}
};
function formatter(value, options) {
return value.toFixed(options.decimals);
}
$.fn.countTo = function (option) {
return this.each(function () {
var $this = $(this);
var data = $this.data('countTo');
var init = !data || typeof(option) === 'object';
var options = typeof(option) === 'object' ? option : {};
var method = typeof(option) === 'string' ? option : 'start';
if (init) {
if (data) data.stop();
$this.data('countTo', data = new CountTo(this, options));
}
data[method].call(data);
});
};
}));
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