Acme.BookStore.HttpApi.Host/node_modules/select2/src/js/select2/dropdown/infiniteScroll.js

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define([
  'jquery'
], function ($) {
  function InfiniteScroll (decorated, $element, options, dataAdapter) {
    this.lastParams = {};

    decorated.call(this, $element, options, dataAdapter);

    this.$loadingMore = this.createLoadingMore();
    this.loading = false;
  }

  InfiniteScroll.prototype.append = function (decorated, data) {
    this.$loadingMore.remove();
    this.loading = false;

    decorated.call(this, data);

    if (this.showLoadingMore(data)) {
      this.$results.append(this.$loadingMore);
      this.loadMoreIfNeeded();
    }
  };

  InfiniteScroll.prototype.bind = function (decorated, container, $container) {
    var self = this;

    decorated.call(this, container, $container);

    container.on('query', function (params) {
      self.lastParams = params;
      self.loading = true;
    });

    container.on('query:append', function (params) {
      self.lastParams = params;
      self.loading = true;
    });

    this.$results.on('scroll', this.loadMoreIfNeeded.bind(this));
  };

  InfiniteScroll.prototype.loadMoreIfNeeded = function () {
    var isLoadMoreVisible = $.contains(
      document.documentElement,
      this.$loadingMore[0]
    );

    if (this.loading || !isLoadMoreVisible) {
      return;
    }

    var currentOffset = this.$results.offset().top +
      this.$results.outerHeight(false);
    var loadingMoreOffset = this.$loadingMore.offset().top +
      this.$loadingMore.outerHeight(false);

    if (currentOffset + 50 >= loadingMoreOffset) {
      this.loadMore();
    }