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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);
}
};
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', function () {
var isLoadMoreVisible = $.contains(
document.documentElement,
self.$loadingMore[0]
);
if (self.loading || !isLoadMoreVisible) {
return;
}
var currentOffset = self.$results.offset().top +
self.$results.outerHeight(false);
var loadingMoreOffset = self.$loadingMore.offset().top +
self.$loadingMore.outerHeight(false);
if (currentOffset + 50 >= loadingMoreOffset) {
self.loadMore();
}
});
};
InfiniteScroll.prototype.loadMore = function () {
this.loading = true;
var params = $.extend({}, {page: 1}, this.lastParams);
params.page++;
this.trigger('query:append', params);
};
InfiniteScroll.prototype.showLoadingMore = function (_, data) {
return data.pagination && data.pagination.more;
};
InfiniteScroll.prototype.createLoadingMore = function () {
var $option = $(
'<li ' +
'class="select2-results__option select2-results__option--load-more"' +
'role="treeitem" aria-disabled="true"></li>'
);
var message = this.options.get('translations').get('loadingMore');
$option.html(message(this.lastParams));
return $option;
};
return InfiniteScroll;
});
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