/*global define */
define([
"backbone",
"collections/Filters",
"collections/SolrResults",
], function (Backbone, Filters, SearchResults) {
"use strict";
/**
* @class FiltersSearchConnector
* @name FiltersSearchConnector
* @classdesc A model that creates listeners between a Filters collection and
* a SearchResults. It does not assume anything about how the search results
* or filters will be displayed in the UI or why those components need to be
* connected. It simply sends a new search when the filters have been changed.
* @name FiltersSearchConnector
* @extends Backbone.Model
* @constructor
* @classcategory Models/Connectors
*/
return Backbone.Model.extend(
/** @lends FiltersSearchConnector.prototype */ {
/**
* The type of Backbone.Model this is.
* @type {string}
* @since 2.25.0
* @default "FiltersSearchConnector
*/
type: "FiltersSearchConnector",
/**
* @type {object}
* @property {Filters} filters A Filters collection to use for this search
* @property {SolrResults} searchResults The SolrResults collection that
* the search results will be stored in
* @property {boolean} isConnected Whether or not the model has listeners
* set between the Filters and SearchResults. Set this with the
* connect and disconnect methods.
*/
defaults: function () {
return {
filters: new Filters([], { catalogSearch: true }),
searchResults: new SearchResults(),
isConnected: false,
};
},
/**
* Sets listeners on the Filters and SearchResults to trigger a search
* when the search changes
* @since 2.22.0
*/
connect: function () {
this.disconnect();
const filters = this.get("filters");
const search = this.get("searchResults");
// Start results at first page and recreate query when the filters change
this.listenTo(filters, "update change", () => this.triggerSearch());
// "changing" event triggers when the query is about to change, but
// before it has been sent. Useful for showing a loading indicator.
this.listenTo(filters, "changing", function () {
search.trigger("changing");
});
this.listenTo(search, "change:sort change:facet", () => this.triggerSearch());
// If the logged-in status changes, send a new search
this.listenTo(
MetacatUI.appUserModel,
"change:loggedIn",
() => this.triggerSearch()
);
this.set("isConnected", true);
},
/**
* Stops listening to changes in the Filters and SearchResults
* @since 2.25.0
*/
disconnect: function () {
const filters = this.get("filters");
const searchResults = this.get("searchResults");
this.stopListening(MetacatUI.appUserModel, "change:loggedIn");
this.stopListening(filters, "update changing");
this.stopListening(searchResults, "change:sort change:facet");
this.set("isConnected", false);
},
/**
* Get Results from the Solr index by combining the Filter query string
* fragments in each Filter instance in the Search collection and querying
* Solr.
* @param {boolean} resetPage - Whether or not to reset the page number
* to 0. Defaults to false.
* @fires SolrResults#toPage
* @since 2.22.0
*/
triggerSearch: function (resetPage = false) {
if (resetPage) MetacatUI.appModel.set("page", 0);
const filters = this.get("filters");
const searchResults = this.get("searchResults");
// Get the Solr query string from the Search filter collection
let query = filters.getQuery();
// Set the query on the SolrResults collection
searchResults.setQuery(query);
// If the query hasn't changed since the last query that was sent, don't
// do anything. This function may have been triggered by a change event
// on a filter that doesn't affect the query at all
if (!searchResults.hasChanged()) {
// Trigger a reset event to indicate the search is complete (e.g. for
// the UI)
searchResults.trigger("reset");
return;
}
// Get the page number
let page = MetacatUI.appModel.get("page") || 0;
searchResults.start = page * searchResults.rows;
// Send the query to the server via the SolrResults collection
searchResults.toPage(page);
},
}
);
});