autosuggest-trie

Minimalistic trie implementation for autosuggest and autocomplete components.

Installation

npm install autosuggest-trie --save

Basic Usage

import createTrie from 'autosuggest-trie';

const locations = [
  {
    id: 1,
    name: 'East Richmond 1234 VIC',
    population: 10000
  },
  {
    id: 2,
    name: 'East Eagle 1235 VIC',
    population: 5000
  },
  {
    id: 3,
    name: 'Richmond West 5678 VIC',
    population: 4000
  },
  {
    id: 4,
    name: 'Cheltenham 3192 Melbourne VIC',
    population: 7000
  },
  {
    id: 5,
    name: 'Richmond 6776 VIC',
    population: 3000
  }
];

const trie = createTrie(locations, 'name');

console.log(trie.getMatches('richmond e'));
/*
  [ { id: 1, name: 'East Richmond 1234 VIC', population: 10000 } ]
*/

console.log(trie.getMatches('ri', { limit: 2 }));
/*
  [ { id: 3, name: 'Richmond West 5678 VIC', population: 4000 },
    { id: 5, name: 'Richmond 6776 VIC', population: 3000 } ]
*/

API

| Function | Description | | :--- | :--- | | createTrie(items, textKey, options) | Creates a trie containing the given items. | | getMatches(query, options) | Returns items that match the given query. |

createTrie(items, textKey, options)

Creates a trie containing the given items.
| Parameter | Type | Required | Description | | :--- | :--- | :---: | :--- | | items | Array | ✓ | Array of items. Every item must be an object. | | textKey | String | ✓ | Key that every item in items must have.
item will be inserted to the trie based on item[textKey]. | | options | Object | | Additional options |
Possible options:
| Option | Type | Default | Description | | :--- | :--- | :---: | :--- | | comparator | Function | none | Items comparator, similar to Array#sort's compareFunction.
It gets two items, and should return a number.

Note: Matches in the first word (let's call it "group 1") are prioritized over matches in the second word ("group 2"), which are prioritized over matches in the third word ("group 3"), and so on.
comparator will only sort the matches within each group.

When comparator is not specified, items within each group will preserve their order in items. | | splitRegex | RegExp | /\s+/ | Used to split items' textKey into words. |

getMatches(query, options)

Returns items that match the given query.
| Parameter | Type | Required | Description | | :--- | :--- | :---: | :--- | | query | String | ✓ | Non-blank query string.

If query is blank, [] is returned. | | options | Object | | Additional query options. |
Possible options:
| Option | Type | Default | Description | | :--- | :--- | :---: | :--- | | limit | Number | Infinity | Integer >= 1

For example: getMatches('me', { limit: 3 }) will return no more than 3 items that match 'me'. | | splitRegex | RegExp | /\s+/ | Used to split the query into words. |

Running Tests

npm test

License

MIT