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# ItemsJS - search engine in javascript

Full text, faceted, dependency free search library in javascript.
Created to perform fast search on json dataset (up to 100K items).

## Demo

![demo](https://raw.githubusercontent.com/itemsapi/itemsjs/master/assets/electronics_search_demo.gif)

[See another demo examples](/docs/demo.md)

## Use cases

Itemsjs is being used mostly for data classification of companies, products, publications, documents, jobs or plants

The solution has been implemented by people from Amazon, Hermes, Apple, Microsoft, James Cook University, Carnegie Mellon University and more.
You can find a list of real implementations - [here](/docs/who-use-it.md) 

## Features

- faceted search
- full text
- pagination
- no dependencies (only javascript)
- working on backend and frontend
- working with custom full text search

## Getting Started

### NPM

```bash
npm install itemsjs
```

```js
const itemsjs = require('itemsjs')(data, configuration);
const items = itemsjs.search();
```

### Client side

or using from the client side:

```bash
npm install itemsjs
```

```html
<!-- CDN -->
<!-- unpkg: use the latest release -->
<script src="https://unpkg.com/itemsjs@latest/dist/itemsjs.min.js"></script>
<!-- unpkg: use a specific version -->
<script src="https://unpkg.com/itemsjs@1.0.49/dist/itemsjs.min.js"></script>
<!-- jsdelivr: use a specific version -->
<script src="https://cdn.jsdelivr.net/npm/itemsjs@1.0.49/dist/itemsjs.min.js"></script>

<!-- locally -->
<script src="/node_modules/itemsjs/dist/itemsjs.js"></script>
```

```js
itemsjs = itemsjs(data, configuration);
itemsjs.search()
```

Gulp task:

```javascript
function itemjs() {
  return src('node_modules/itemsjs/dist/itemsjs.min.js')
      .pipe(dest('source/javascripts/'));
}; // Will copy to source/javascripts/itemsjs.min.js
```

## Example

```bash
npm install itemsjs

# download json data
wget https://raw.githubusercontent.com/itemsapi/itemsapi-example-data/master/items/imdb.json -O data.json
```

Create `search.js`:

```js
const data = require('./data.json');

const itemsjs = require('itemsjs')(data, {
  sortings: {
    name_asc: {
      field: 'name',
      order: 'asc'
    }
  },
  aggregations: {
    tags: {
      title: 'Tags',
      size: 10,
      conjunction: false
    },
    actors: {
      title: 'Actors',
      size: 10
    },
    genres: {
      title: 'Genres',
      size: 10
    }
  },
  searchableFields: ['name', 'tags']
});

/**
 * get filtered list of movies 
 */
const movies = itemsjs.search({
  per_page: 1,
  sort: 'name_asc',
  // full text search
  // query: 'forrest gump',
  filters: {
    tags: ['1980s']
  }
})
console.log(JSON.stringify(movies, null, 2));

/**
 * get list of top tags 
 */
const top_tags = itemsjs.aggregation({
  name: 'tags',
  per_page: 10
})
console.log(JSON.stringify(top_tags, null, 2));
```

Test that with :

```bash
node search.js
```

## Integrations

If native full text search is not enough then you can integrate with external full text search.

How it works:

- each item of your data needs to have `id` field. It can be also custom field but it needs to be defined.
- `native_search_enabled` option in configuration should be disabled
- index data once in your search and itemsjs
- make search in your custom search and provide `ids` data into itemsjs
- done!

Examples:

- [Integration with MiniSearch](/docs/minisearch-integration.md)
- [Integration with Lunr2.x](/docs/lunr2-integration.md)

## API

### `const itemsjs = ItemsJS(data, [configuration])`

#### `data`

The first `data` argument is an array of objects.

#### `configuration`

Responsible for defining global configuration. Look for full example here - [configuration](/docs/configuration.md)

- **`aggregations`** filters configuration i.e. for `tags`, `actors`, `colors`, etc. Responsible for generating facets.

  Each filter can have it's own configuration. You can access those as `buckets` on the `search()` response.

  - **`title`** Human readable filter name
  - **`size`** Number of values provided for this filter (Default: `10`)
  - **`sort`** Values sorted by `count` (Default) or `key` for the value name. This can be also an array of keys which define the sorting priority 
  - **`order`** `asc` | `desc`. This can be also an array of orders (if `sort` is also array) 
  - **`show_facet_stats`** `true` | `false` (Default) to retrieve the min, max, avg, sum rating values from the whole filtered dataset
  - **`conjunction`** `true` (Default) stands for an _AND_ query (results have to fit all selected facet-values), `false` for an _OR_ query (results have to fit one of the selected facet-values)
  - **`chosen_filters_on_top`** `true` (Default) Filters that have been selected will appear above those not selected, `false` for filters displaying in the order set out by `sort` and `order` regardless of selected status or not
  - **`hide_zero_doc_count`** `true` | `false` (Default) Hide filters that have 0 results returned
  
- **`sortings`** you can configure different sortings like `tags_asc`, `tags_desc` with options and later use it with one key.

- **`searchableFields`** an array of searchable fields.

- **`native_search_enabled`** if native full text search is enabled (true | false. It's enabled by default)

- **`isExactSearch`** set to `true` if you want to always show exact search matches. See [lunr stemmer](https://github.com/olivernn/lunr.js/issues/328) and [lunr stopWordFilter](https://github.com/olivernn/lunr.js/issues/233).

- **`removeStopWordFilter`** set to `true` if you want to remove the stopWordFilter. See https://github.com/itemsapi/itemsjs/issues/46.

### `itemsjs.search(options)`

#### `options`

- **`per_page`** amount of items per page.

- **`page`** page number - used for pagination.

- **`query`** used for full text search.

- **`sort`** used for sorting. one of `sortings` key
  
- **`filters`** filtering items based on specific aggregations i.e. {tags: ['drama' , 'historical']}  

- **`filter`** function responsible for items filtering. The way of working is similar to js [native filter function](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/filter). [See example](/docs/configuration.md)

- **`filters_query`** boolean filtering i.e. (tags:novel OR tags:80s) AND category:Western

- **`is_all_filtered_items`** set to `true` if you want to return the whole filtered dataset. 

### `itemsjs.aggregation(options)`

It returns full list of filters for specific aggregation

#### `options`

- **`name`** aggregation name
- **`per_page`** filters per page
- **`page`** page number
- **`query`** used for quering filters. It's not full text search
- **`conjunction`** `true` (Default) stands for an _AND_ query, `false` for an _OR_ query

### `itemsjs.similar(id, options)`

It returns similar items to item for given id

#### `options`

- **`field`** field name for computing similarity (i.e. tags, actors, colors)
- **`minimum`** what is the minimum intersection between field of based item and similar item to show them in the result
- **`per_page`** filters per page
- **`page`** page number

  
### `itemsjs.reindex(data)`

It's used in case you need to reindex the whole data

#### `data`

An array of objects.
