algoliasearch-helper

What is algoliasearch-helper?

The `algoliasearch-helper` package is a JavaScript library that provides a set of tools to manage search parameters and results when using Algolia's search API. It helps in building complex search interfaces by offering functionalities like managing search states, refining search queries, and handling pagination.

What are algoliasearch-helper's main functionalities?

Managing Search Parameters

This feature allows you to manage search parameters such as facets and disjunctive facets. The code sample demonstrates how to initialize the helper with specific facets and add a facet refinement to filter search results.

const algoliasearch = require('algoliasearch');
const algoliasearchHelper = require('algoliasearch-helper');

const client = algoliasearch('YourApplicationID', 'YourAdminAPIKey');
const index = client.initIndex('your_index_name');
const helper = algoliasearchHelper(client, 'your_index_name', {
  facets: ['category'],
  disjunctiveFacets: ['brand']
});

helper.addFacetRefinement('category', 'Books').search();

Handling Pagination

This feature helps in handling pagination of search results. The code sample shows how to set the page number and listen for the search results.

helper.setPage(2).search();

helper.on('result', function(content) {
  console.log(content.hits);
});

Refining Search Queries

This feature allows you to refine search queries. The code sample demonstrates how to set a search query and listen for the search results.

helper.setQuery('Harry Potter').search();

helper.on('result', function(content) {
  console.log(content.hits);
});

Managing Search States

This feature allows you to manage the search state. The code sample shows how to get the current search state and set a new search state.

const state = helper.getState();
console.log(state);

helper.setState({
  query: 'Harry Potter',
  page: 1
}).search();

Other packages similar to algoliasearch-helper

elasticlunr

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lunr

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search-index

Search-index is a powerful search engine for Node.js that allows you to index and search documents. It provides similar functionalities to Algolia but is more flexible and can be used for a variety of search use cases.

README

Coming from V1 (or js client v2)? Read the migration guide to the new version of the Helper.

Coming from V2? Read the migration guide to the new version of the Helper.

The JavaScript helper is an advanced library we provide to our users. If you are looking to build a complete search interface, we recommend you to use instantsearch.js. If you want to build an autocomplete menu, see autocomplete.js.

algoliasearch-helper-js

This module is the companion of the algolia/algoliasearch-client-js. It helps you keep track of the search parameters and provides a higher level API.

See the helper in action

• Features
• Examples
  • Vanilla JavaScript
  • AngularJS module
• Helper cheatsheet
  • Add the helper in your project
  • Regular <script> tag
  • With NPM
  • Init the helper
  • Helper lifecycle
  • Objects
  • Search
  • Events
  • Query
  • Filtering results
  • Facet utilities
  • Tags
  • Pagination
  • Index
  • One time query
  • Query parameters
  • Results format
• Browser support

Features

• Search parameters management
• Facets exclusions
• Pagination
• Disjunctive faceting (search on two or more values of the same facet)

Examples

Vanilla JavaScript

A small example that uses Browserify to manage modules.

var algoliasearch = require('algoliasearch');
var algoliasearchHelper = require('algoliasearch-helper');

var client = algoliasearch('appId', 'apiKey');

var helper = algoliasearchHelper(client, 'indexName', {
  facets: ['mainCharacterFirstName', 'year'],
  disjunctiveFacets: ['director']
});

helper.on('result', function(event){
  console.log(event.results);
});

helper.addDisjunctiveFacetRefinement('director', 'Clint Eastwood');
helper.addDisjunctiveFacetRefinement('director', 'Sofia Coppola');

helper.addNumericRefinement('year', '=', 2003);

// Search for any movie filmed in 2003 and directed by either C. Eastwood or S. Coppola
helper.search();

See more examples in the examples folder

AngularJS module

<script src="https://cdn.jsdelivr.net/algoliasearch/3/algoliasearch.angular.js"></script>
<script src="dist/algoliasearch.helper.min.js"></script>

<script type="text/javascript">
angular.module('searchApp', ['ngSanitize', 'algoliasearch'])
.controller('searchController', ['$scope', '$sce', 'algolia', function($scope, $sce, algolia) {
  var algolia = algolia.Client('applicationId', 'apiKey');
  $scope.q = '';
  $scope.content = null;
  $scope.helper = algoliasearchHelper(algolia, 'indexName', {
    facets: ['type', 'shipping'],
    disjunctiveFacets: ['category', 'manufacturer'],
    hitsPerPage: 5,
  });
  $scope.helper.on('result', function(event) {
    $scope.$apply(function() {
      $scope.content = event.results;
    });
  });
  $scope.toggleRefine = function($event, facet, value) {
    $event.preventDefault();
    $scope.helper.toggleRefine(facet, value).search();
  };
  $scope.$watch('q', function(q) {
    $scope.helper.setQuery(q).search();
  });
  $scope.helper.search();
}]);
</script>

You can see the full Angular example here

Helper cheatsheet

There is also a complete JSDoc

Add the helper in your project

Regular <script> tag

Use our jsDelivr build:

<script src="https://cdn.jsdelivr.net/algoliasearch.helper/2/algoliasearch.helper.min.js"></script>

With NPM

npm install algoliasearch-helper

Init the helper

var helper = algoliasearchHelper(client, 'indexName'/*, parameters*/);

Helper lifecycle

1. modify the parameters of the search (usually through user interactions)
   helper.setQuery('iphone').addFacetRefinement('category', 'phone')

2. trigger the search (after all the modification have been applied)
   helper.search()

3. read the results (with the event "result" handler) and update the UI with the results
   helper.on('result', function(event) { updateUI(event.results); });

4. go back to 1

Objects

AlgoliasearchHelper: the helper. Keeps the state of the search, makes the queries and calls the handlers when an event happen.

SearchParameters: the object representing the state of the search. The current state is stored in helperInstance.state.

SearchResults: the object in which the Algolia answers are transformed into. This object is passed to the result event handler. An example of SearchResults in JSON is available at the end of this readme

Search

The search is triggered by the search() method.

It takes all the previous modifications to the search and uses them to create the queries to Algolia. The search parameters are immutable.

Example:

var helper = algoliasearchHelper(client, indexName);

// Let's monitor the results with the console
helper.on('result', function(event) {
  console.log(event.results);
});

// Let's make an empty search
// The results are all sorted using the dashboard configuration
helper.search();

// Let's search for "landscape"
helper.setQuery('landscape').search();

// Let's add a category "photo"
// Will make a search with "photo" tag and "landscape" as the query
helper.addTag('photo').search();

Events

The helper is a Node.js EventEmitter instance.

result: get notified when new results are received. The handler function will receive two objects (SearchResults and SearchParameters).

error: get notified when errors are received from the API.

change: get notified when a property has changed in the helper

search : get notified when a request is sent to Algolia

Listen to the result event

helper.on('result', updateTheResults);

Listen to a result event once

helper.once('result', updateTheResults);

Remove a result listener

helper.removeListener('result', updateTheResults);

Remove all result listeners

helper.removeAllListeners('result');

All the methods from Node.js EventEmitter class are available.

Query

Do a search with the query "fruit"

helper.setQuery('fruit').search();

Filtering results

Facets are filters to retrieve a subset of an index having a specific value for a given attribute. First you need to define which attribute will be used as a facet in the dashboard: https://www.algolia.com/explorer#?tab=display

Regular (conjunctive) facets

Refinements are ANDed by default (Conjunctive selection).

Facet definition

var helper = algoliasearchHelper(client, indexName, {
	facets: ['ANDFacet']
});

Add a facet filter

helper.addFacetRefinement('ANDFacet', 'valueOfANDFacet').search();

Remove a facet filter

helper.removeFacetRefinement('ANDFacet', 'valueOfANDFacet').search();

Disjunctive facets

Refinements are ORed by default (Disjunctive selection).

Facet definition

var helper = algoliasearchHelper(client, indexName, {
	disjunctiveFacets: ['ORFacet']
});

Add a facet filter

helper.addDisjunctiveFacetRefinement('ORFacet', 'valueOfORFacet').search();

Remove a facet filter

helper.removeDisjunctiveFacetRefinement('ORFacet', 'valueOfORFacet').search();

Negative facets

Filter so that we do NOT get a given facet

Facet definition (same as "AND" facet)

var helper = algoliasearchHelper(client, indexName, {
	facets: ['ANDFacet']
}).search();

Exclude a value for a facet

helper.addFacetExclusion('ANDFacet', 'valueOfANDFacetToExclude');

Remove an exclude from the list of excluded values

helper.removeFacetExclusion('ANDFacet', 'valueOfANDFacetToExclude');

Numeric facets

Filter over numeric attributes with math operations like =, >, <, >=, <=. Can be used for numbers and dates (if converted to timestamp)

Facet definition

var helper = algoliasearchHelper(client, indexName, {
  disjunctiveFacets: ['numericAttribute']
});

Add numeric refinements

helper.addNumericRefinement('numericAttribute', '=', '3').search();
// filter to only the results that match numericAttribute=3
helper.addNumericRefinement('numericAttribute', '=', '4').search();
// filter to only the results that match numericAttribute=3 AND numericAttribute=4

// On another numeric with no previous filter
helper.addNumericRefinement('numericAttribute2', '=', ['42', '56', '37'] ).search();
// filter to only the results that match numericAttribute2=42 OR numericAttribute2=56 OR numericAttribute2=37

Remove a numeric refinement

helper.removeNumericRefinement('numericAttribute', '=', '3').search();

Batch numeric filter removal

// for the single operator = on numericAttribute
helper.removeNumericRefinement('numericAttribute', '=').search();
// for all the refinements on numericAttribute
helper.removeNumericRefinement('numericAttribute').search();

Hierarchical facets

Hierarchical facets are useful to build such navigation menus:

| products
  > fruits
    > citrus
    | strawberries
    | peaches
    | apples

Here, we refined the search this way:

• click on fruits
• click on citrus

Usage

To build such menu, you need to use hierarchical faceting:

var helper = algoliasearchHelper(client, indexName, {
  hierarchicalFacets: [{
    name: 'products',
    attributes: ['categories.lvl0', 'categories.lvl1']
  }]
});

Requirements: All the specified attributes must be defined in your Algolia settings as attributes for faceting.

Given your objects looks like this:

{
  "objectID": "123",
  "name": "orange",
  "categories": {
    "lvl0": "fruits",
    "lvl1": "fruits > citrus"
  }
}

And you refine products:

helper.toggleFacetRefinement('products', 'fruits > citrus');

You will get a hierarchical presentation of your facet values: a navigation menu of your facet values.

helper.on('result', function(event){
  console.log(event.results.hierarchicalFacets[0]);
  // {
  //   'name': 'products',
  //   'count': null,
  //   'isRefined': true,
  //   'path': null,
  //   'data': [{
  //     'name': 'fruits',
  //     'path': 'fruits',
  //     'count': 1,
  //     'isRefined': true,
  //     'data': [{
  //       'name': 'citrus',
  //       'path': 'fruits > citrus',
  //       'count': 1,
  //       'isRefined': true,
  //       'data': null
  //     }]
  //   }]
  // }
});

To ease navigation, we always:

• provide the root level categories
• provide the current refinement sub categories (fruits > citrus > *: n + 1)
• provide the parent refinement (fruits > citrus => fruits: n -1) categories
• refine the search using the current hierarchical refinement

Multiple values per level

Your records can also share multiple categories between one another by using arrays inside your object:

{
  "objectID": "123",
  "name": "orange",
  "categories": {
    "lvl0": ["fruits", "color"],
    "lvl1": ["fruits > citrus", "color > orange"]
  }
},
{
  "objectID": "456",
  "name": "grapefruit",
  "categories": {
    "lvl0": ["fruits", "color", "new"],
    "lvl1": ["fruits > citrus", "color > yellow", "new > citrus"]
  }
}

Specifying another separator

var helper = algoliasearchHelper(client, indexName, {
  hierarchicalFacets: [{
    name: 'products',
    attributes: ['categories.lvl0', 'categories.lvl1'],
    separator: '|'
  }]
});

helper.toggleFacetRefinement('products', 'fruits|citrus');

Would mean that your objects look like so:

{
  "objectID": "123",
  "name": "orange",
  "categories": {
    "lvl0": "fruits",
    "lvl1": "fruits|citrus"
  }
}

Specifying a different sort order for values

The default sort for the hierarchical facet view is: isRefined:desc (first show refined), name:asc (then sort by name).

You can specify a different sort order by using:

var helper = algoliasearchHelper(client, indexName, {
  hierarchicalFacets: [{
    name: 'products',
    attributes: ['categories.lvl0', 'categories.lvl1'],
    sortBy: ['count:desc', 'name:asc'] // first show the most common values, then sort by name
  }]
});

The available sort tokens are:

• count
• isRefined
• name
• path

Restrict results and hierarchical values to non-root level

Let's say you have a lot of levels:

- fruits
  - yellow
    - citrus
      - spicy

But you only want to get the values starting at "citrus", you can use rootPath

You can specify an root path to filter the hierarchical values

var helper = algoliasearchHelper(client, indexName, {
  hierarchicalFacets: [{
    name: 'products',
    attributes: ['categories.lvl0', 'categories.lvl1', 'categories.lvl2', 'categories.lvl3'],
    rootPath: 'fruits > yellow > citrus'
  }]
});

Having a rootPath will refine the results on it automatically.

Hide parent level of current parent level

By default the hierarchical facet is going to return the child and parent facet values of the current refinement.

If you do not want to get the parent facet values you can set showParentLevel to false

var helper = algoliasearchHelper(client, indexName, {
  hierarchicalFacets: [{
    name: 'products',
    attributes: ['categories.lvl0', 'categories.lvl1'],
    showParentLevel: false
  }]
});

Asking for the current breadcrumb

var helper = algoliasearchHelper(client, indexName, {
  hierarchicalFacets: [{
    name: 'products',
    attributes: ['categories.lvl0', 'categories.lvl1'],
    separator: '|'
  }]
});

helper.toggleFacetRefinement('products', 'fruits|citrus');
var breadcrumb = helper.getHierarchicalFacetBreadcrumb('products');

console.log(breadcrumb);
// ['fruits', 'citrus']

console.log(breadcrumb.join(' | '));
// 'fruits | citrus'

Clearing filters

Clear all the refinements for all the refined attributes

helper.clearRefinements().search();

Clear all the refinements for a specific attribute

helper.clearRefinements('ANDFacet').search();

[ADVANCED] Clear only the exclusions on the "ANDFacet" attribute

helper.clearRefinements(function(value, attribute, type) {
  return type === 'exclude' && attribute === 'ANDFacet';
}).search();

Facet utilities

Get the values of a facet with the default sort

helper.on('result', function(event) {
  // Get the facet values for the attribute age
  event.results.getFacetValues('age');
  // It will be ordered :
  //  - refined facets first
  //  - then ordered by number of occurence (bigger count -> higher in the list)
  //  - then ordered by name (alphabetically)
});

Get the values of a facet with a custom sort

helper.on('result', function(event) {
  // Get the facet values for the attribute age
  event.results.getFacetValues('age', {sortBy: ['count:asc']});
  // It will be ordered by number of occurence (lower number => higher position)
  // Elements that can be sorted : count, name, isRefined
  // Type of sort : 'asc' for ascending order, 'desc' for descending order
});

Get the facet stats

This only apply on numeric based facets/attributes.

helper.on('result', function(event) {
  // Get the facet values for the attribute age
  event.results.getFacetStats('age');
});

Tags

Tags are an easy way to do filtering. They are based on a special attribute in the records named _tags, which can be a single string value or an array of strings.

Add a tag filter for the value "landscape"

helper.addTag('landscape').search();

Remove a tag filter for the value "landscape"

helper.removeTag('landscape').search();

Clear all the tags filters

helper.clearTags().search();

Pagination

Get the current page

helper.getPage();

Change page

helper.setPage(3).search();

Automatic reset to page 0

During a search, changing the parameters will update the result set, which can then change the number of pages in the result set. Therefore, the behavior has been standardized so that any operation that may change the number of page will reset the pagination to page 0.

This may lead to some unexpected behavior. For example:

helper.setPage(4);
helper.getPage(); // 4
helper.setQuery('foo');
helper.getPage(); // 0

Non exhaustive list of operations that trigger a reset:

• refinements (conjunctive, exclude, disjunctive, hierarchical, numeric)
• tags
• index (setIndex)
• setQuery
• setHitsPerPage
• setTypoTolerance

Index

Index can be changed. The common use case is when you have several slaves with different sort order (sort by relevance, price or any other attribute).

Change the current index

helper.setIndex('index_orderByPrice').search();

Get the current index

var currentIndex = helper.getIndex();

One time query

Sometime it's convenient to reuse the current search parameters with small changes without changing the state stored in the helper. That's why there is a function called searchOnce. This method does not trigger change or error events.

In the following, we are using searchOnce to fetch only a single element using all the other parameters already set in the search parameters.

Using searchOnce with a callback

var state = helper.searchOnce(
  {hitsPerPage: 1},
  function(error, content, state) {
    // if an error occured it will be passed in error, otherwise its value is null
    // content contains the results formatted as a SearchResults
    // state is the instance of SearchParameters used for this search
  });

Using searchOnce with a promise

var state1 = helper.searchOnce({hitsPerPage: 1})
                   .then(function(res) {
  // res contains
  // {
  //   content : SearchResults
  //   state : SearchParameters (the one used for this specific search)
  // }
});

Query parameters

There are lots of other parameters you can set.

Set a parameter at the initialization of the helper

var helper = algoliasearchHelper(client, indexName, {
	hitsPerPage: 50
});

Set a parameter later

helper.setQueryParameter('hitsPerPage', 20).search();

List of parameters that can be set

Name	Type	Description
advancedSyntax	boolean	Enable the advanced syntax. advancedSyntax on Algolia.com
allowTyposOnNumericTokens	boolean	Should the engine allow typos on numerics. allowTyposOnNumericTokens on Algolia.com
analytics	boolean	Enable the analytics analytics on Algolia.com
analyticsTags	string	Tag of the query in the analytics. analyticsTags on Algolia.com
aroundLatLng	string	Center of the geo search. aroundLatLng on Algolia.com
aroundLatLngViaIP	boolean	Center of the search, retrieve from the user IP. aroundLatLngViaIP on Algolia.com
aroundPrecision	number	Precision of the geo search. aroundPrecision on Algolia.com
aroundRadius	number	Radius of the geo search. aroundRadius on Algolia.com
minimumAroundRadius	number	Minimum radius of the geo search. minimumAroundRadius on Algolia.com
attributesToHighlight	string	List of attributes to highlight attributesToHighlight on Algolia.com
attributesToRetrieve	string	List of attributes to retrieve attributesToRetrieve on Algolia.com
attributesToSnippet	string	List of attributes to snippet attributesToSnippet on Algolia.com
disjunctiveFacets	Array.<string>	All the declared disjunctive facets
distinct	boolean|number	Remove duplicates based on the index setting attributeForDistinct distinct on Algolia.com
facets	Array.<string>	All the facets that will be requested to the server
filters	string	Add filters to the query (similar to WHERE clauses) filters on Algolia.com
getRankingInfo	integer	Enable the ranking informations in the response getRankingInfo on Algolia.com
hitsPerPage	number	Number of hits to be returned by the search API hitsPerPage on Algolia.com
ignorePlurals	boolean	Should the plurals be ignored ignorePlurals on Algolia.com
insideBoundingBox	string	Geo search inside a box. insideBoundingBox on Algolia.com
insidePolygon	string	Geo search inside a polygon. insidePolygon on Algolia.com
maxValuesPerFacet	number	Number of values for each facetted attribute maxValuesPerFacet on Algolia.com
minWordSizefor1Typo	number	Number of characters to wait before doing one character replacement. minWordSizefor1Typo on Algolia.com
minWordSizefor2Typos	number	Number of characters to wait before doing a second character replacement. minWordSizefor2Typos on Algolia.com
optionalWords	string	Add some optional words to those defined in the dashboard optionalWords on Algolia.com
page	number	The current page number page on Algolia.com
query	string	Query string of the instant search. The empty string is a valid query. query on Algolia.com
queryType	string	How the query should be treated by the search engine. Possible values: prefixAll, prefixLast, prefixNone queryType on Algolia.com
removeWordsIfNoResults	string	Possible values are "lastWords" "firstWords" "allOptional" "none" (default) removeWordsIfNoResults on Algolia.com
replaceSynonymsInHighlight	boolean	Should the engine replace the synonyms in the highlighted results. replaceSynonymsInHighlight on Algolia.com
restrictSearchableAttributes	string	Restrict which attribute is searched. restrictSearchableAttributes on Algolia.com
synonyms	boolean	Enable the synonyms synonyms on Algolia.com
tagFilters	string	Contains the tag filters in the raw format of the Algolia API. Setting this parameter is not compatible with the of the add/remove/toggle methods of the tag api. tagFilters on Algolia.com
typoTolerance	string	How the typo tolerance behave in the search engine. Possible values: true, false, min, strict typoTolerance on Algolia.com

Results format

Here is an example of a result object you get with the result event.

{
   "hitsPerPage": 10,
   "processingTimeMS": 2,
   "facets": [
      {
         "name": "type",
         "data": {
            "HardGood": 6627,
            "BlackTie": 550,
            "Music": 665,
            "Software": 131,
            "Game": 456,
            "Movie": 1571
         },
         "exhaustive": false
      },
      {
         "exhaustive": false,
         "data": {
            "Free shipping": 5507
         },
         "name": "shipping"
      }
   ],
   "hits": [
      {
         "thumbnailImage": "http://img.bbystatic.com/BestBuy_US/images/products/1688/1688832_54x108_s.gif",
         "_highlightResult": {
            "shortDescription": {
               "matchLevel": "none",
               "value": "Safeguard your PC, Mac, Android and iOS devices with comprehensive Internet protection",
               "matchedWords": []
            },
            "category": {
               "matchLevel": "none",
               "value": "Computer Security Software",
               "matchedWords": []
            },
            "manufacturer": {
               "matchedWords": [],
               "value": "Webroot",
               "matchLevel": "none"
            },
            "name": {
               "value": "Webroot SecureAnywhere Internet Security (3-Device) (1-Year Subscription) - Mac/Windows",
               "matchedWords": [],
               "matchLevel": "none"
            }
         },
         "image": "http://img.bbystatic.com/BestBuy_US/images/products/1688/1688832_105x210_sc.jpg",
         "shipping": "Free shipping",
         "bestSellingRank": 4,
         "shortDescription": "Safeguard your PC, Mac, Android and iOS devices with comprehensive Internet protection",
         "url": "http://www.bestbuy.com/site/webroot-secureanywhere-internet-security-3-devi…d=1219060687969&skuId=1688832&cmp=RMX&ky=2d3GfEmNIzjA0vkzveHdZEBgpPCyMnLTJ",
         "name": "Webroot SecureAnywhere Internet Security (3-Device) (1-Year Subscription) - Mac/Windows",
         "category": "Computer Security Software",
         "salePrice_range": "1 - 50",
         "objectID": "1688832",
         "type": "Software",
         "customerReviewCount": 5980,
         "salePrice": 49.99,
         "manufacturer": "Webroot"
      },
      ....
   ],
   "nbHits": 10000,
   "disjunctiveFacets": [
      {
         "exhaustive": false,
         "data": {
            "5": 183,
            "12": 112,
            "7": 149,
            ...
         },
         "name": "customerReviewCount",
         "stats": {
            "max": 7461,
            "avg": 157.939,
            "min": 1
         }
      },
      {
         "data": {
            "Printer Ink": 142,
            "Wireless Speakers": 60,
            "Point & Shoot Cameras": 48,
            ...
         },
         "name": "category",
         "exhaustive": false
      },
      {
         "exhaustive": false,
         "data": {
            "> 5000": 2,
            "1 - 50": 6524,
            "501 - 2000": 566,
            "201 - 500": 1501,
            "101 - 200": 1360,
            "2001 - 5000": 47
         },
         "name": "salePrice_range"
      },
      {
         "data": {
            "Dynex™": 202,
            "Insignia™": 230,
            "PNY": 72,
            ...
         },
         "name": "manufacturer",
         "exhaustive": false
      }
   ],
   "query": "",
   "nbPages": 100,
   "page": 0,
   "index": "bestbuy"
}

Browser support

This project works on any ES5 browser, basically >= IE9+.