scratch – Rev 117
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/*=========================
Images Lazy Loading
===========================*/
s.lazy = {
initialImageLoaded: false,
loadImageInSlide: function (index, loadInDuplicate) {
if (typeof index === 'undefined') return;
if (typeof loadInDuplicate === 'undefined') loadInDuplicate = true;
if (s.slides.length === 0) return;
var slide = s.slides.eq(index);
var img = slide.find('.' + s.params.lazyLoadingClass + ':not(.' + s.params.lazyStatusLoadedClass + '):not(.' + s.params.lazyStatusLoadingClass + ')');
if (slide.hasClass(s.params.lazyLoadingClass) && !slide.hasClass(s.params.lazyStatusLoadedClass) && !slide.hasClass(s.params.lazyStatusLoadingClass)) {
img = img.add(slide[0]);
}
if (img.length === 0) return;
img.each(function () {
var _img = $(this);
_img.addClass(s.params.lazyStatusLoadingClass);
var background = _img.attr('data-background');
var src = _img.attr('data-src'),
srcset = _img.attr('data-srcset'),
sizes = _img.attr('data-sizes');
s.loadImage(_img[0], (src || background), srcset, sizes, false, function () {
if (typeof s === 'undefined' || s === null || !s) return;
if (background) {
_img.css('background-image', 'url("' + background + '")');
_img.removeAttr('data-background');
}
else {
if (srcset) {
_img.attr('srcset', srcset);
_img.removeAttr('data-srcset');
}
if (sizes) {
_img.attr('sizes', sizes);
_img.removeAttr('data-sizes');
}
if (src) {
_img.attr('src', src);
_img.removeAttr('data-src');
}
}
_img.addClass(s.params.lazyStatusLoadedClass).removeClass(s.params.lazyStatusLoadingClass);
slide.find('.' + s.params.lazyPreloaderClass + ', .' + s.params.preloaderClass).remove();
if (s.params.loop && loadInDuplicate) {
var slideOriginalIndex = slide.attr('data-swiper-slide-index');
if (slide.hasClass(s.params.slideDuplicateClass)) {
var originalSlide = s.wrapper.children('[data-swiper-slide-index="' + slideOriginalIndex + '"]:not(.' + s.params.slideDuplicateClass + ')');
s.lazy.loadImageInSlide(originalSlide.index(), false);
}
else {
var duplicatedSlide = s.wrapper.children('.' + s.params.slideDuplicateClass + '[data-swiper-slide-index="' + slideOriginalIndex + '"]');
s.lazy.loadImageInSlide(duplicatedSlide.index(), false);
}
}
s.emit('onLazyImageReady', s, slide[0], _img[0]);
});
s.emit('onLazyImageLoad', s, slide[0], _img[0]);
});
},
load: function () {
var i;
var slidesPerView = s.params.slidesPerView;
if (slidesPerView === 'auto') {
slidesPerView = 0;
}
if (!s.lazy.initialImageLoaded) s.lazy.initialImageLoaded = true;
if (s.params.watchSlidesVisibility) {
s.wrapper.children('.' + s.params.slideVisibleClass).each(function () {
s.lazy.loadImageInSlide($(this).index());
});
}
else {
if (slidesPerView > 1) {
for (i = s.activeIndex; i < s.activeIndex + slidesPerView ; i++) {
if (s.slides[i]) s.lazy.loadImageInSlide(i);
}
}
else {
s.lazy.loadImageInSlide(s.activeIndex);
}
}
if (s.params.lazyLoadingInPrevNext) {
if (slidesPerView > 1 || (s.params.lazyLoadingInPrevNextAmount && s.params.lazyLoadingInPrevNextAmount > 1)) {
var amount = s.params.lazyLoadingInPrevNextAmount;
var spv = slidesPerView;
var maxIndex = Math.min(s.activeIndex + spv + Math.max(amount, spv), s.slides.length);
var minIndex = Math.max(s.activeIndex - Math.max(spv, amount), 0);
// Next Slides
for (i = s.activeIndex + slidesPerView; i < maxIndex; i++) {
if (s.slides[i]) s.lazy.loadImageInSlide(i);
}
// Prev Slides
for (i = minIndex; i < s.activeIndex ; i++) {
if (s.slides[i]) s.lazy.loadImageInSlide(i);
}
}
else {
var nextSlide = s.wrapper.children('.' + s.params.slideNextClass);
if (nextSlide.length > 0) s.lazy.loadImageInSlide(nextSlide.index());
var prevSlide = s.wrapper.children('.' + s.params.slidePrevClass);
if (prevSlide.length > 0) s.lazy.loadImageInSlide(prevSlide.index());
}
}
},
onTransitionStart: function () {
if (s.params.lazyLoading) {
if (s.params.lazyLoadingOnTransitionStart || (!s.params.lazyLoadingOnTransitionStart && !s.lazy.initialImageLoaded)) {
s.lazy.load();
}
}
},
onTransitionEnd: function () {
if (s.params.lazyLoading && !s.params.lazyLoadingOnTransitionStart) {
s.lazy.load();
}
}
};