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import $ from 'jquery';
import 'vendor/jquery.endless-scroll';
import axios from '~/lib/utils/axios_utils';
import { removeParams, getParameterByName } from '~/lib/utils/url_utility';
const ENDLESS_SCROLL_BOTTOM_PX = 400;
const ENDLESS_SCROLL_FIRE_DELAY_MS = 1000;
export default {
init({
limit = 0,
preload = false,
disable = false,
prepareData = $.noop,
successCallback = $.noop,
errorCallback = $.noop,
container = '',
} = {}) {
this.limit = limit;
this.offset = parseInt(getParameterByName('offset'), 10) || this.limit;
this.disable = disable;
this.prepareData = prepareData;
this.successCallback = successCallback;
this.errorCallback = errorCallback;
this.$container = $(container);
this.$loading = this.$container.length
? this.$container.find('.loading').first()
: $('.loading').first();
if (preload) {
this.offset = 0;
this.getOld();
}
this.initLoadMore();
},
getOld() {
this.$loading.show();
const url = $('.content_list').data('href') || removeParams(['limit', 'offset']);
axios
.get(url, {
params: {
limit: this.limit,
offset: this.offset,
},
})
.then(({ data }) => {
this.append(data.count, this.prepareData(data.html));
this.successCallback();
// keep loading until we've filled the viewport height
if (!this.disable && !this.isScrollable()) {
this.getOld();
} else {
this.$loading.hide();
}
})
.catch((err) => this.errorCallback(err))
.finally(() => this.$loading.hide());
},
append(count, html) {
$('.content_list').append(html);
if (count > 0) {
this.offset += count;
if (count < this.limit) {
this.disable = true;
}
} else {
this.disable = true;
}
},
isScrollable() {
const $w = $(window);
return $(document).height() > $w.height() + $w.scrollTop() + ENDLESS_SCROLL_BOTTOM_PX;
},
initLoadMore() {
// eslint-disable-next-line @gitlab/no-global-event-off
$(document).off('scroll');
$(document).endlessScroll({
bottomPixels: ENDLESS_SCROLL_BOTTOM_PX,
fireDelay: ENDLESS_SCROLL_FIRE_DELAY_MS,
fireOnce: true,
ceaseFire: () => this.disable === true,
callback: () => {
if (this.$container.length && !this.$container.is(':visible')) {
return;
}
if (!this.$loading.is(':visible')) {
this.$loading.show();
this.getOld();
}
},
});
},
};
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