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slick.js
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/*
_ _ _ _
___| (_) ___| | __ (_)___
/ __| | |/ __| |/ / | / __|
\__ \ | | (__| < _ | \__ \
|___/_|_|\___|_|\_(_)/ |___/
|__/
Version: 1.4.1
Author: Ken Wheeler
Website: http://kenwheeler.github.io
Docs: http://kenwheeler.github.io/slick
Repo: http://github.com/kenwheeler/slick
Issues: http://github.com/kenwheeler/slick/issues
*/
/* global window, document, define, jQuery, setInterval, clearInterval */
(function(factory) {
'use strict';
if (typeof define === 'function' && define.amd) {
define(['jquery'], factory);
} else if (typeof exports !== 'undefined') {
module.exports = factory(require('jquery'));
} else {
factory(jQuery);
}
}(function($) {
'use strict';
var Slick = window.Slick || {};
Slick = (function() {
var instanceUid = 0;
function Slick(element, settings) {
var _ = this,
dataSettings, responsiveSettings, breakpoint;
_.defaults = {
accessibility: true,
adaptiveHeight: false,
appendArrows: $(element),
appendDots: $(element),
arrows: true,
asNavFor: null,
prevArrow: '<button type="button" data-role="none" class="slick-prev" aria-label="previous">Previous</button>',
nextArrow: '<button type="button" data-role="none" class="slick-next" aria-label="next">Next</button>',
autoplay: false,
autoplaySpeed: 3000,
centerMode: false,
centerPadding: '50px',
cssEase: 'ease',
customPaging: function(slider, i) {
return '<button type="button" data-role="none">' + (i + 1) + '</button>';
},
dots: false,
dotsClass: 'slick-dots',
draggable: true,
easing: 'linear',
edgeFriction: 0.35,
fade: false,
focusOnSelect: false,
infinite: true,
initialSlide: 0,
lazyLoad: 'ondemand',
mobileFirst: false,
pauseOnHover: true,
pauseOnDotsHover: false,
respondTo: 'window',
responsive: null,
rtl: false,
slide: '',
slidesToShow: 1,
slidesToScroll: 1,
speed: 500,
swipe: true,
swipeToSlide: false,
touchMove: true,
touchThreshold: 5,
useCSS: true,
variableWidth: false,
vertical: false,
waitForAnimate: true
};
_.initials = {
animating: false,
dragging: false,
autoPlayTimer: null,
currentDirection: 0,
currentLeft: null,
currentSlide: 0,
direction: 1,
$dots: null,
listWidth: null,
listHeight: null,
loadIndex: 0,
$nextArrow: null,
$prevArrow: null,
slideCount: null,
slideWidth: null,
$slideTrack: null,
$slides: null,
sliding: false,
slideOffset: 0,
swipeLeft: null,
$list: null,
touchObject: {},
transformsEnabled: false
};
$.extend(_, _.initials);
_.activeBreakpoint = null;
_.animType = null;
_.animProp = null;
_.breakpoints = [];
_.breakpointSettings = [];
_.cssTransitions = false;
_.hidden = "hidden";
_.paused = false;
_.positionProp = null;
_.respondTo = null;
_.shouldClick = true;
_.$slider = $(element);
_.$slidesCache = null;
_.transformType = null;
_.transitionType = null;
_.visibilityChange = "visibilitychange";
_.windowWidth = 0;
_.windowTimer = null;
dataSettings = $(element).data('slick') || {};
_.options = $.extend({}, _.defaults, dataSettings, settings);
_.currentSlide = _.options.initialSlide;
_.originalSettings = _.options;
responsiveSettings = _.options.responsive || null;
if (responsiveSettings && responsiveSettings.length > -1) {
_.respondTo = _.options.respondTo || "window";
for (breakpoint in responsiveSettings) {
if (responsiveSettings.hasOwnProperty(breakpoint)) {
_.breakpoints.push(responsiveSettings[
breakpoint].breakpoint);
_.breakpointSettings[responsiveSettings[
breakpoint].breakpoint] =
responsiveSettings[breakpoint].settings;
}
}
_.breakpoints.sort(function(a, b) {
if(_.options.mobileFirst === true) {
return a - b;
} else {
return b - a;
}
});
}
if (typeof document.mozHidden !== "undefined") {
_.hidden = "mozHidden";
_.visibilityChange = "mozvisibilitychange";
} else if (typeof document.msHidden !== "undefined") {
_.hidden = "msHidden";
_.visibilityChange = "msvisibilitychange";
} else if (typeof document.webkitHidden !== "undefined") {
_.hidden = "webkitHidden";
_.visibilityChange = "webkitvisibilitychange";
}
_.autoPlay = $.proxy(_.autoPlay, _);
_.autoPlayClear = $.proxy(_.autoPlayClear, _);
_.changeSlide = $.proxy(_.changeSlide, _);
_.clickHandler = $.proxy(_.clickHandler, _);
_.selectHandler = $.proxy(_.selectHandler, _);
_.setPosition = $.proxy(_.setPosition, _);
_.swipeHandler = $.proxy(_.swipeHandler, _);
_.dragHandler = $.proxy(_.dragHandler, _);
_.keyHandler = $.proxy(_.keyHandler, _);
_.autoPlayIterator = $.proxy(_.autoPlayIterator, _);
_.instanceUid = instanceUid++;
// A simple way to check for HTML strings
// Strict HTML recognition (must start with <)
// Extracted from jQuery v1.11 source
_.htmlExpr = /^(?:\s*(<[\w\W]+>)[^>]*)$/;
_.init();
_.checkResponsive(true);
}
return Slick;
}());
Slick.prototype.addSlide = Slick.prototype.slickAdd = function(markup, index, addBefore) {
var _ = this;
if (typeof(index) === 'boolean') {
addBefore = index;
index = null;
} else if (index < 0 || (index >= _.slideCount)) {
return false;
}
_.unload();
if (typeof(index) === 'number') {
if (index === 0 && _.$slides.length === 0) {
$(markup).appendTo(_.$slideTrack);
} else if (addBefore) {
$(markup).insertBefore(_.$slides.eq(index));
} else {
$(markup).insertAfter(_.$slides.eq(index));
}
} else {
if (addBefore === true) {
$(markup).prependTo(_.$slideTrack);
} else {
$(markup).appendTo(_.$slideTrack);
}
}
_.$slides = _.$slideTrack.children(this.options.slide);
_.$slideTrack.children(this.options.slide).detach();
_.$slideTrack.append(_.$slides);
_.$slides.each(function(index, element) {
$(element).attr("data-slick-index",index);
});
_.$slidesCache = _.$slides;
_.reinit();
};
Slick.prototype.animateHeight = function(){
var _ = this;
if(_.options.slidesToShow === 1 && _.options.adaptiveHeight === true && _.options.vertical === false) {
var targetHeight = _.$slides.eq(_.currentSlide).outerHeight(true);
_.$list.animate({height: targetHeight},_.options.speed);
}
};
Slick.prototype.animateSlide = function(targetLeft, callback) {
var animProps = {}, _ = this;
_.animateHeight();
if (_.options.rtl === true && _.options.vertical === false) {
targetLeft = -targetLeft;
}
if (_.transformsEnabled === false) {
if (_.options.vertical === false) {
_.$slideTrack.animate({
left: targetLeft
}, _.options.speed, _.options.easing, callback);
} else {
_.$slideTrack.animate({
top: targetLeft
}, _.options.speed, _.options.easing, callback);
}
} else {
if (_.cssTransitions === false) {
if (_.options.rtl === true) {
_.currentLeft = -(_.currentLeft);
}
$({
animStart: _.currentLeft
}).animate({
animStart: targetLeft
}, {
duration: _.options.speed,
easing: _.options.easing,
step: function(now) {
now = Math.ceil(now);
if (_.options.vertical === false) {
animProps[_.animType] = 'translate(' +
now + 'px, 0px)';
_.$slideTrack.css(animProps);
} else {
animProps[_.animType] = 'translate(0px,' +
now + 'px)';
_.$slideTrack.css(animProps);
}
},
complete: function() {
if (callback) {
callback.call();
}
}
});
} else {
_.applyTransition();
targetLeft = Math.ceil(targetLeft);
if (_.options.vertical === false) {
animProps[_.animType] = 'translate3d(' + targetLeft + 'px, 0px, 0px)';
} else {
animProps[_.animType] = 'translate3d(0px,' + targetLeft + 'px, 0px)';
}
_.$slideTrack.css(animProps);
if (callback) {
setTimeout(function() {
_.disableTransition();
callback.call();
}, _.options.speed);
}
}
}
};
Slick.prototype.asNavFor = function(index) {
var _ = this, asNavFor = _.options.asNavFor !== null ? $(_.options.asNavFor).slick('getSlick') : null;
if(asNavFor !== null) asNavFor.slideHandler(index, true);
};
Slick.prototype.applyTransition = function(slide) {
var _ = this,
transition = {};
if (_.options.fade === false) {
transition[_.transitionType] = _.transformType + ' ' + _.options.speed + 'ms ' + _.options.cssEase;
} else {
transition[_.transitionType] = 'opacity ' + _.options.speed + 'ms ' + _.options.cssEase;
}
if (_.options.fade === false) {
_.$slideTrack.css(transition);
} else {
_.$slides.eq(slide).css(transition);
}
};
Slick.prototype.autoPlay = function() {
var _ = this;
if (_.autoPlayTimer) {
clearInterval(_.autoPlayTimer);
}
if (_.slideCount > _.options.slidesToShow && _.paused !== true) {
_.autoPlayTimer = setInterval(_.autoPlayIterator,
_.options.autoplaySpeed);
}
};
Slick.prototype.autoPlayClear = function() {
var _ = this;
if (_.autoPlayTimer) {
clearInterval(_.autoPlayTimer);
}
};
Slick.prototype.autoPlayIterator = function() {
var _ = this;
if (_.options.infinite === false) {
if (_.direction === 1) {
if ((_.currentSlide + 1) === _.slideCount -
1) {
_.direction = 0;
}
_.slideHandler(_.currentSlide + _.options.slidesToScroll);
} else {
if ((_.currentSlide - 1 === 0)) {
_.direction = 1;
}
_.slideHandler(_.currentSlide - _.options.slidesToScroll);
}
} else {
_.slideHandler(_.currentSlide + _.options.slidesToScroll);
}
};
Slick.prototype.buildArrows = function() {
var _ = this;
if (_.options.arrows === true && _.slideCount > _.options.slidesToShow) {
_.$prevArrow = $(_.options.prevArrow);
_.$nextArrow = $(_.options.nextArrow);
if (_.htmlExpr.test(_.options.prevArrow)) {
_.$prevArrow.appendTo(_.options.appendArrows);
}
if (_.htmlExpr.test(_.options.nextArrow)) {
_.$nextArrow.appendTo(_.options.appendArrows);
}
if (_.options.infinite !== true) {
_.$prevArrow.addClass('slick-disabled');
}
}
};
Slick.prototype.buildDots = function() {
var _ = this,
i, dotString;
if (_.options.dots === true && _.slideCount > _.options.slidesToShow) {
dotString = '<ul class="' + _.options.dotsClass + '">';
for (i = 0; i <= _.getDotCount(); i += 1) {
dotString += '<li>' + _.options.customPaging.call(this, _, i) + '</li>';
}
dotString += '</ul>';
_.$dots = $(dotString).appendTo(
_.options.appendDots);
_.$dots.find('li').first().addClass('slick-active').attr("aria-hidden","false");
}
};
Slick.prototype.buildOut = function() {
var _ = this;
_.$slides = _.$slider.children(_.options.slide +
':not(.slick-cloned)').addClass(
'slick-slide');
_.slideCount = _.$slides.length;
_.$slides.each(function(index, element) {
$(element).attr("data-slick-index",index);
});
_.$slidesCache = _.$slides;
_.$slider.addClass('slick-slider');
_.$slideTrack = (_.slideCount === 0) ?
$('<div class="slick-track"/>').appendTo(_.$slider) :
_.$slides.wrapAll('<div class="slick-track"/>').parent();
_.$list = _.$slideTrack.wrap(
'<div aria-live="polite" class="slick-list"/>').parent();
_.$slideTrack.css('opacity', 0);
if (_.options.centerMode === true || _.options.swipeToSlide === true) {
_.options.slidesToScroll = 1;
}
$('img[data-lazy]', _.$slider).not('[src]').addClass('slick-loading');
_.setupInfinite();
_.buildArrows();
_.buildDots();
_.updateDots();
if (_.options.accessibility === true) {
_.$list.prop('tabIndex', 0);
}
_.setSlideClasses(typeof this.currentSlide === 'number' ? this.currentSlide : 0);
if (_.options.draggable === true) {
_.$list.addClass('draggable');
}
};
Slick.prototype.checkResponsive = function(initial) {
var _ = this,
breakpoint, targetBreakpoint, respondToWidth;
var sliderWidth = _.$slider.width();
var windowWidth = window.innerWidth || $(window).width();
if (_.respondTo === "window") {
respondToWidth = windowWidth;
} else if (_.respondTo === "slider") {
respondToWidth = sliderWidth;
} else if (_.respondTo === "min") {
respondToWidth = Math.min(windowWidth, sliderWidth);
}
if (_.originalSettings.responsive && _.originalSettings
.responsive.length > -1 && _.originalSettings.responsive !== null) {
targetBreakpoint = null;
for (breakpoint in _.breakpoints) {
if (_.breakpoints.hasOwnProperty(breakpoint)) {
if (_.originalSettings.mobileFirst === false) {
if (respondToWidth < _.breakpoints[breakpoint]) {
targetBreakpoint = _.breakpoints[breakpoint];
}
} else {
if (respondToWidth > _.breakpoints[breakpoint]) {
targetBreakpoint = _.breakpoints[breakpoint];
}
}
}
}
if (targetBreakpoint !== null) {
if (_.activeBreakpoint !== null) {
if (targetBreakpoint !== _.activeBreakpoint) {
_.activeBreakpoint =
targetBreakpoint;
if(_.breakpointSettings[targetBreakpoint] === "unslick") {
_.unslick();
} else {
_.options = $.extend({}, _.originalSettings,
_.breakpointSettings[
targetBreakpoint]);
if(initial === true)
_.currentSlide = _.options.initialSlide;
_.refresh();
}
}
} else {
_.activeBreakpoint = targetBreakpoint;
if(_.breakpointSettings[targetBreakpoint] === "unslick") {
_.unslick();
} else {
_.options = $.extend({}, _.originalSettings,
_.breakpointSettings[
targetBreakpoint]);
if(initial === true)
_.currentSlide = _.options.initialSlide;
_.refresh();
}
}
} else {
if (_.activeBreakpoint !== null) {
_.activeBreakpoint = null;
_.options = _.originalSettings;
if(initial === true)
_.currentSlide = _.options.initialSlide;
_.refresh();
}
}
}
};
Slick.prototype.changeSlide = function(event, dontAnimate) {
var _ = this,
$target = $(event.target),
indexOffset, slideOffset, unevenOffset;
// If target is a link, prevent default action.
$target.is('a') && event.preventDefault();
unevenOffset = (_.slideCount % _.options.slidesToScroll !== 0);
indexOffset = unevenOffset ? 0 : (_.slideCount - _.currentSlide) % _.options.slidesToScroll;
switch (event.data.message) {
case 'previous':
slideOffset = indexOffset === 0 ? _.options.slidesToScroll : _.options.slidesToShow - indexOffset;
if (_.slideCount > _.options.slidesToShow) {
_.slideHandler(_.currentSlide - slideOffset, false, dontAnimate);
}
break;
case 'next':
slideOffset = indexOffset === 0 ? _.options.slidesToScroll : indexOffset;
if (_.slideCount > _.options.slidesToShow) {
_.slideHandler(_.currentSlide + slideOffset, false, dontAnimate);
}
break;
case 'index':
var index = event.data.index === 0 ? 0 :
event.data.index || $(event.target).parent().index() * _.options.slidesToScroll;
_.slideHandler(_.checkNavigable(index), false, dontAnimate);
break;
default:
return;
}
};
Slick.prototype.checkNavigable = function(index) {
var _ = this, navigables, prevNavigable;
navigables = _.getNavigableIndexes();
prevNavigable = 0;
if(index > navigables[navigables.length -1]){
index = navigables[navigables.length -1];
} else {
for(var n in navigables) {
if(index < navigables[n]) {
index = prevNavigable;
break;
}
prevNavigable = navigables[n];
}
}
return index;
};
Slick.prototype.clickHandler = function(event) {
var _ = this;
if(_.shouldClick === false) {
event.stopImmediatePropagation();
event.stopPropagation();
event.preventDefault();
}
};
Slick.prototype.destroy = function() {
var _ = this;
_.autoPlayClear();
_.touchObject = {};
$('.slick-cloned', _.$slider).remove();
if (_.$dots) {
_.$dots.remove();
}
if (_.$prevArrow && (typeof _.options.prevArrow !== 'object')) {
_.$prevArrow.remove();
}
if (_.$nextArrow && (typeof _.options.nextArrow !== 'object')) {
_.$nextArrow.remove();
}
_.$slides.removeClass('slick-slide slick-active slick-center slick-visible')
.attr("aria-hidden","true")
.removeAttr('data-slick-index')
.css({
position: '',
left: '',
top: '',
zIndex: '',
opacity: '',
width: ''
});
_.$slider.removeClass('slick-slider');
_.$slider.removeClass('slick-initialized');
_.$list.off('.slick');
$(window).off('.slick-' + _.instanceUid);
$(document).off('.slick-' + _.instanceUid);
_.$slider.html(_.$slides);
};
Slick.prototype.disableTransition = function(slide) {
var _ = this,
transition = {};
transition[_.transitionType] = "";
if (_.options.fade === false) {
_.$slideTrack.css(transition);
} else {
_.$slides.eq(slide).css(transition);
}
};
Slick.prototype.fadeSlide = function(slideIndex, callback) {
var _ = this;
if (_.cssTransitions === false) {
_.$slides.eq(slideIndex).css({
zIndex: 1000
});
_.$slides.eq(slideIndex).animate({
opacity: 1
}, _.options.speed, _.options.easing, callback);
} else {
_.applyTransition(slideIndex);
_.$slides.eq(slideIndex).css({
opacity: 1,
zIndex: 1000
});
if (callback) {
setTimeout(function() {
_.disableTransition(slideIndex);
callback.call();
}, _.options.speed);
}
}
};
Slick.prototype.filterSlides = Slick.prototype.slickFilter = function(filter) {
var _ = this;
if (filter !== null) {
_.unload();
_.$slideTrack.children(this.options.slide).detach();
_.$slidesCache.filter(filter).appendTo(_.$slideTrack);
_.reinit();
}
};
Slick.prototype.getCurrent = Slick.prototype.slickCurrentSlide = function() {
var _ = this;
return _.currentSlide;
};
Slick.prototype.getDotCount = function() {
var _ = this;
var breakPoint = 0;
var counter = 0;
var pagerQty = 0;
if(_.options.infinite === true) {
pagerQty = Math.ceil(_.slideCount / _.options.slidesToScroll);
} else if (_.options.centerMode === true) {
pagerQty = _.slideCount;
} else {
while (breakPoint < _.slideCount){
++pagerQty;
breakPoint = counter + _.options.slidesToShow;
counter += _.options.slidesToScroll <= _.options.slidesToShow ? _.options.slidesToScroll : _.options.slidesToShow;
}
}
return pagerQty - 1;
};
Slick.prototype.getLeft = function(slideIndex) {
var _ = this,
targetLeft,
verticalHeight,
verticalOffset = 0,
targetSlide;
_.slideOffset = 0;
verticalHeight = _.$slides.first().outerHeight();
if (_.options.infinite === true) {
if (_.slideCount > _.options.slidesToShow) {
_.slideOffset = (_.slideWidth * _.options.slidesToShow) * -1;
verticalOffset = (verticalHeight * _.options.slidesToShow) * -1;
}
if (_.slideCount % _.options.slidesToScroll !== 0) {
if (slideIndex + _.options.slidesToScroll > _.slideCount && _.slideCount > _.options.slidesToShow) {
if(slideIndex > _.slideCount) {
_.slideOffset = ((_.options.slidesToShow - (slideIndex - _.slideCount)) * _.slideWidth) * -1;
verticalOffset = ((_.options.slidesToShow - (slideIndex - _.slideCount)) * verticalHeight) * -1;
} else {
_.slideOffset = ((_.slideCount % _.options.slidesToScroll) * _.slideWidth) * -1;
verticalOffset = ((_.slideCount % _.options.slidesToScroll) * verticalHeight) * -1;
}
}
}
} else {
if(slideIndex + _.options.slidesToShow > _.slideCount) {
_.slideOffset = ((slideIndex + _.options.slidesToShow) - _.slideCount) * _.slideWidth;
verticalOffset = ((slideIndex + _.options.slidesToShow) - _.slideCount) * verticalHeight;
}
}
if (_.slideCount <= _.options.slidesToShow){
_.slideOffset = 0;
verticalOffset = 0;
}
if (_.options.centerMode === true && _.options.infinite === true) {
_.slideOffset += _.slideWidth * Math.floor(_.options.slidesToShow / 2) - _.slideWidth;
} else if (_.options.centerMode === true) {
_.slideOffset = 0;
_.slideOffset += _.slideWidth * Math.floor(_.options.slidesToShow / 2);
}
if (_.options.vertical === false) {
targetLeft = ((slideIndex * _.slideWidth) * -1) + _.slideOffset;
} else {
targetLeft = ((slideIndex * verticalHeight) * -1) + verticalOffset;
}
if (_.options.variableWidth === true) {
if (_.slideCount <= _.options.slidesToShow || _.options.infinite === false) {
targetSlide = _.$slideTrack.children('.slick-slide').eq(slideIndex);
} else {
targetSlide = _.$slideTrack.children('.slick-slide').eq(slideIndex + _.options.slidesToShow);
}
targetLeft = targetSlide[0] ? targetSlide[0].offsetLeft * -1 : 0;
if (_.options.centerMode === true) {
if(_.options.infinite === false) {
targetSlide = _.$slideTrack.children('.slick-slide').eq(slideIndex);
} else {
targetSlide = _.$slideTrack.children('.slick-slide').eq(slideIndex + _.options.slidesToShow + 1);
}
targetLeft = targetSlide[0] ? targetSlide[0].offsetLeft * -1 : 0;
targetLeft += (_.$list.width() - targetSlide.outerWidth()) / 2;
}
}
return targetLeft;
};
Slick.prototype.getOption = Slick.prototype.slickGetOption = function(option) {
var _ = this;
return _.options[option];
};
Slick.prototype.getNavigableIndexes = function() {
var _ = this, breakPoint = 0, counter = 0, indexes = [], max;
if(_.options.infinite === false) {
max = _.slideCount - _.options.slidesToShow + 1;
if (_.options.centerMode === true) max = _.slideCount;
} else {
breakPoint = _.slideCount * -1;
counter = _.slideCount * -1;
max = _.slideCount * 2;
}
while (breakPoint < max){
indexes.push(breakPoint);
breakPoint = counter + _.options.slidesToScroll;
counter += _.options.slidesToScroll <= _.options.slidesToShow ? _.options.slidesToScroll : _.options.slidesToShow;
}
return indexes;
};
Slick.prototype.getSlick = function() {
return this;
};
Slick.prototype.getSlideCount = function() {
var _ = this, slidesTraversed, swipedSlide, centerOffset;
centerOffset = _.options.centerMode === true ? _.slideWidth * Math.floor(_.options.slidesToShow / 2) : 0;
if(_.options.swipeToSlide === true) {
_.$slideTrack.find('.slick-slide').each(function(index, slide){
if (slide.offsetLeft - centerOffset + ($(slide).outerWidth() / 2) > (_.swipeLeft * -1)) {
swipedSlide = slide;
return false;
}
});
slidesTraversed = Math.abs($(swipedSlide).attr('data-slick-index') - _.currentSlide) || 1;
return slidesTraversed;
} else {
return _.options.slidesToScroll;
}
};
Slick.prototype.goTo = Slick.prototype.slickGoTo = function(slide, dontAnimate) {
var _ = this;
_.changeSlide({
data: {
message: 'index',
index: parseInt(slide)
}
}, dontAnimate);
};
Slick.prototype.init = function() {
var _ = this;
if (!$(_.$slider).hasClass('slick-initialized')) {
$(_.$slider).addClass('slick-initialized');
_.buildOut();
_.setProps();
_.startLoad();
_.loadSlider();
_.initializeEvents();
_.updateArrows();
_.updateDots();
}
_.$slider.trigger("init", [ _ ]);
};
Slick.prototype.initArrowEvents = function() {
var _ = this;
if (_.options.arrows === true && _.slideCount > _.options.slidesToShow) {
_.$prevArrow.on('click.slick', {
message: 'previous'
}, _.changeSlide);
_.$nextArrow.on('click.slick', {
message: 'next'
}, _.changeSlide);
}
};
Slick.prototype.initDotEvents = function() {
var _ = this;