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(() => {
const ENDLESS_SCROLL_BOTTOM_PX = 400;
const ENDLESS_SCROLL_FIRE_DELAY_MS = 1000;
const Pager = {
init(limit = 0, preload = false, disable = false, callback = $.noop) {
this.limit = limit;
this.offset = this.limit;
this.disable = disable;
this.callback = callback;
this.loading = $('.loading').first();
if (preload) {
this.offset = 0;
this.getOld();
}
this.initLoadMore();
},
getOld() {
this.loading.show();
$.ajax({
type: 'GET',
url: $('.content_list').data('href') || window.location.href,
data: `limit=${this.limit}&offset=${this.offset}`,
dataType: 'json',
error: () => this.loading.hide(),
success: (data) => {
this.append(data.count, data.html);
this.callback();
// keep loading until we've filled the viewport height
if (!this.disable && !this.isScrollable()) {
this.getOld();
} else {
this.loading.hide();
}
},
});
},
append(count, html) {
$('.content_list').append(html);
if (count > 0) {
this.offset += count;
} else {
this.disable = true;
}
},
isScrollable() {
const $w = $(window);
return $(document).height() > $w.height() + $w.scrollTop() + ENDLESS_SCROLL_BOTTOM_PX;
},
initLoadMore() {
$(document).unbind('scroll');
$(document).endlessScroll({
bottomPixels: ENDLESS_SCROLL_BOTTOM_PX,
fireDelay: ENDLESS_SCROLL_FIRE_DELAY_MS,
fireOnce: true,
ceaseFire: () => this.disable === true,
callback: () => {
if (!this.loading.is(':visible')) {
this.loading.show();
this.getOld();
}
},
});
},
};
window.Pager = Pager;
})();
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