_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. If you want to build an autocomplete menu, see Autocomplete.

algoliasearch-helper

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

See the helper in action

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- Features
- Examples
- Vanilla JavaScript
- AngularJS module
- Helper cheatsheet
- Add the helper in your project
- Regular



`

You can see the full Angular example here

Helper cheatsheet

There is also a complete JSDoc

$3

$3

Use our jsDelivr build:

$3

npm install algoliasearch-helper

$3

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

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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

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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

$3

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:

`js
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();
`

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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

`js
helper.on('result', updateTheResults);
`

#### Listen to a result event once

`js
helper.once('result', updateTheResults);
`

#### Remove a result listener

`js
helper.removeListener('result', updateTheResults);
`

#### Remove all result listeners

`js
helper.removeAllListeners('result');
`

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

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#### Do a search with the query "fruit"

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

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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

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

##### Add a facet filter

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

##### Remove a facet filter

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

#### Disjunctive facets

Refinements are ORed by default (Disjunctive selection).

##### Facet definition

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

##### Add a facet filter

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

##### Remove a facet filter

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

#### Negative facets

Filter so that we do NOT get a given facet

##### Facet definition (same as "AND" facet)

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

##### Exclude a value for a facet

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

##### Remove an exclude from the list of excluded values

`js
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

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

##### Add numeric refinements

`js
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

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

##### Batch numeric filter removal

`js
// 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:

`txt
| 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:

`javascript
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:

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

And you refine products:

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

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

`js
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:

`json
{
"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

`js
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:

`json
{
"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:

`js
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

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

##### Asking for the current breadcrumb

`js
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

`js
helper.clearRefinements().search();
`

##### Clear all the refinements for a specific attribute

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

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

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

$3

#### Get the values of a facet with the default sort

`js
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

`js
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._

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

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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"

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

#### Remove a tag filter for the value "landscape"

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

#### Clear all the tags filters

`js
helper.clearTags().search();
`

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#### Get the current page

`js
helper.getPage();
`

#### Change page

`js
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:

`js
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

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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

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

#### Get the current index

`js
var currentIndex = helper.getIndex();
`

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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

`js
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

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

$3

There are lots of other parameters you can set.

#### Set a parameter at the initialization of the helper

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

#### Set a parameter later

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

#### List of parameters that can be set

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

`js
{
"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+.