sajari

Sajari Javascript SDK

The Sajari Javascript SDK provides web integration for browsers.

Sajari Search is a hosted search and recommendation service supporting instant search, faceted search, recommendations and custom matching algorithms

This module is for querying the search service. If you want automated indexing, profiling and convenience functions for rendering HTML, please check out sajari-website instead.

Table of Contents

• Setup
  • Npm, Browserify, Webpack
• Getting Started
• Usage
  • Body
  • Page
  • Results Per Page
  • Filter
  • Sorting
  • Aggregates
  • Instance Boosts
  • Field Boosts
  • Tokens
    • Pos Neg
    • Click
  • Results
  • Reset ID
• License
• Browser Support

Setup

The library is 7.2KB minified and 2.8KB gzipped.

NPM, Browserify, webpack

npm install sajari --save

Getting Started

import { Api, Query, body } from 'sajari'

const api = new Api('project', 'collection')
const query = new Query()

query.body([
  body("foo bar")
])

api.search(query, (err, res) => {
  console.log(err, res)
})

The Api object handles the requesting and callbacks. If you need to override the default address, you can supply an extra parameter to Api:

new Api('project', 'collection', 'http://localhost:8000')

The Query object handles the query state. Use the methods on it to define your queries.

Body

body is the text to search for in the collection. It takes a string, and an optional decimal number for the weighting.

The query.body() method takes an array of body. This is useful if you would like to weigh some text differently.

Simple example

import { body } from 'sajari'

query.body([
  body('computer parts')
])

Expanded example

import { body } from 'sajari'

query.body([
  body('red computer parts', 1),
  body('laptop', 0.8),
  body('desktop', 0.8),
])

Page

To use pagination, set the page value on the query via the query.page() method.

Example

query.page(2)

ResultsPerPage

To set the maximum number of results to be returned by one query use query.resultsPerPage(). Use in conjunction with page to support pagination.

Example

query.resultsPerPage(20)

Filter

Filters let you exclude documents from the result set. A query only has 1 filter attached to it, but it is still possible to construct arbitrarily nested filters to satisfy any query logic.

Field filters act on a value in a field, resulting in a true or false result.

Query Filter
FILTER_OP_EQ
FILTER_OP_NOT_EQ
FILTER_OP_GT
FILTER_OP_GT_EQ
FILTER_OP_LT
FILTER_OP_LT_EQ
FILTER_OP_CONTAINS
FILTER_OP_NOT_CONTAIN
FILTER_OP_PREFIX
FILTER_OP_SUFFIX

Combinator filters act on an array of filters, also resulting in a true of false result.

Query Filter Combinator
COMB_FILTER_OP_ALL
COMB_FILTER_OP_ANY
COMB_FILTER_OP_ONE
COMB_FILTER_OP_NONE

Filter Example

import { fieldFilter, FILTER_OP_LT } from 'sajari'

query.filter(
  fieldFilter('price', 100, FILTER_OP_LT)
)

Combinator Filter Example

import { fieldFIlter, FILTER_OP_LT, FILTER_OP_GT_EQ, combinatorFilter } from 'sajari'

query.filter(
  combinatorFilter([
    fieldFilter('price', 100, FILTER_OP_LT),
    fieldFilter('stock', 3, FILTER_OP_GT_EQ)
  ], COMB_FILTER_OP_ALL)
)

Sorting

Sorts allow you to order your results based on their fields. Queries can take multiple sorts, using successive sorts to resolve ties.

Sort Order
SORT_ASCENDING
SORT_DESCENDING

Sort Example

import { SORT_ASCENDING } from 'sajari'

query.sort([
  sort('price', SORT_ASCENDING)
])

Expanded Sort Example

import { SORT_ASCENDING, SORT_DESCENDING } from 'sajari'

query.sort([
  sort('rating', SORT_DESCENDING),
  sort('price', SORT_ASCENDING),
  sort('performance', SORT_DESCENDING),
])

Aggregates

Aggregates give you information about your data.

There are 3 types of aggregates. Metric and Count both work on fields, while Bucket works on Filters.

• Metric - statistical information such as minimum, maximum, count, average, and sum.
• Count - the counts for each value.
• Bucket - counts of categories that match the supplied filters

Metric Aggregate Type
METRIC_TYPE_MAX
METRIC_TYPE_MIN
METRIC_TYPE_AVG
METRIC_TYPE_SUM

Metric example

import { metricAggregate, METRIC_TYPE_MAX, METRIC_TYPE_MIN, METRIC_TYPE_AVG, METRIC_TYPE_SUM } from 'sajari'

query.aggregates([
  metricAggregate('Most expensive part', 'price', METRIC_TYPE_MAX),
  metricAggregate('Least expensive part', 'price', METRIC_TYPE_MIN),
  metricAggregate('Average price of part', 'price', METRIC_TYPE_AVG),
  metricAggregate('Number of parts available', 'quantity', METRIC_TYPE_SUM),
])

Count example

import { countAggregate } from 'sajari'

query.aggregates([
  countAggregate('Number of parts by manufacturer', 'manufacturer')
])

Bucket example

import { bucketAggregate, bucket, fieldFilter, FILTER_OP_LT, FILTER_OP_GT_EQ, FILTER_OP_GT, combinatorFilter, COMB_FILTER_OP_ALL } from 'sajari'

query.aggregates([
  bucketAggregate(
    'Price groups',
    [
      bucket('$0 - $99',
        fieldFilter('price', 100, FILTER_OP_LT)
      )
      bucket('$100 - $199',
        combinatorFilter([
          fieldFilter('price', 100, FILTER_OP_GT_EQ),
          fieldFilter('price', 200, FILTER_OP_LT),
        ], COMB_FILTER_ALL)
      ),
      bucket('$200+',
        fieldFilter('price', 200, FILTER_OP_GT)
      ),
    ]
  )
])

Instance boosts

Instance boosts can influence the scoring of indexed fields. This is commonly used to make the title or keywords of a page play a larger role.

Field Instance Boost Example

import { fieldInstanceBoost } from 'sajari'

query.instanceBoosts([
  fieldInstanceBoost('title', 1.5)
])

Score Instance Boost Example

import { scoreInstanceBoost } from 'sajari'

query.instanceBoosts([
  scoreInstanceBoost(2)
])

Field boosts

Field boosts allow you to influence the scoring of results based on the data in certain meta fields. In theory they are similar to filters that influence the score rather than exclude/include documents.

The most obvious boost is a filter boost. It applies a boost if the document matches the filter.

Filter Field Boost Example

import { filterFieldBoost, fieldFilter, FILTER_OP_LT } from 'sajari'

query.fieldBoosts([
  filterFieldBoost(fieldFilter('price', 100, FILTER_OP_LT), 2) 
])

Additive Field Boost Example

import { additiveFieldBoost, filterFieldBoost, fieldFilter, FILTER_OP_LT } from 'sajari'

query.fieldBoosts([
  additiveFieldBoost(filterFieldBoost(fieldFilter('price', 100, FILTER_OP_LT), 2), 0.5)
])

If you had latitude and longitude fields, geo-boosting is a good option to get location-aware results.

Geo Field Boost Example

Boost results within 50km of Sydney.

Geo Boost Regions
GEO_FIELD_BOOST_REGION_INSIDE
GEO_FIELD_BOOST_REGION_OUTSIDE

query.fieldBoosts([
  geoFieldBoost('lat', 'lng', -33.8688, 151.2093, 50, 2, GEO_FIELD_BOOST_REGION_INSIDE)
]);

If you would like to scale a value based on arbitrary points, you can use the interval boost.

Interval Field Boost Example

This will scale the score based on a sliding scale defined through points.

import { intervalFieldBoost, pointValue } from 'sajari'

query.fieldBoosts([
  intervalFieldBoost('performance', [
    pointValue(0, 0.5),
    pointValue(80, 1),
    pointValue(100, 1.5),
  ])
])

Distance Field Boost Example

Distance boosts let you boost a result, with values closer to the ref given a higher boost (up to the specified boost value). In this example, a value of 50 would get 2x boost, value 60 would get 1.5x, value of 70 or higher would get 1x.

import { distanceFieldBoost } from 'sajari'

query.fieldBoosts([
  distanceFieldBoost(30, 70, 50, 'price', 2)
])

Element Field Boost Example

Element field boosts can be applied to string arrays.

import { elementFieldBoost } from 'sajari'

query.fieldBoosts([
  elementFieldBoost('keywords', ['sale', 'deal'])
])

Text Field Boost Example

Boost results with the word 'reviews' in the 'description' field.

import { textFieldBoost } from 'sajari'

query.fieldBoosts([
  textFieldBoost('description', 'reviews')
])

Tokens

Pos Neg

The argument to posNeg is the field to use. It must be unique.

query.posNeg('url')

Click

The argument to click is the field to use. It must be unique.

query.click('url')

Results

The results that come back from a successful search look like this

{
  reads: "1000", // Engine read 1000 documents
  totalResults: "50", //  50 documents matches the query
  time: "2.2ms", // Time taken
  aggregates: {...}, // An object describing the results of the various aggregates applied to the query
  results: [
    {
      meta: {
        _id: "49913-3c39-7e62-7b81-3ec5a156", // Auto generated unique id for the document
        title: "New Computer Part Sale!",
        url: "/awesome_part.html",
        description: "Super awesome part, does x, y, z...",
        price: 59.99,
        keywords: ['sale', 'deal', 'part'],
        ...
      },
      score: 0.4, // Score of the document with boosts applied
      rawScore: 0.4 // Score of the document without boosts applied
    },
    ...
  ]
}

The results property is an array of objects, each containing their score, and meta fields.

Reset ID

This method is used if you would like the next search you perform to count as a different query. This has more to do with stats and won't directly affect your query in any way.

// ... Some searches
query.resetID() // You have determined that from now on, the query is sufficiently different to be classified as a new query for tracking purposes
// ... Some searches

License

We use the MIT license

Browser Support

This library uses the Fetch API. Fetch is available on all evergreen browsers (Chrome, Firefox, Edge), see here for a more complete overview. We recommend using isomorphic-fetch to increase compatibility across other browsers and Node.js.