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Screenshot of emoji-picker-element in light and dark modes

<emoji-picker></emoji-picker>

A lightweight emoji picker, distributed as a web component.

It's built on IndexedDB, so it consumes far less memory than other emoji pickers. It also uses Svelte, so it has a minimal runtime footprint.

Features:

  • Stores emoji data in IndexedDB
  • Renders native emoji only, no spritesheets
  • Accessible
  • Drop-in as a web component
  • Supports custom emoji

Table of contents:

Install

npm install emoji-picker-element

Usage

import 'emoji-picker-element';
<emoji-picker></emoji-picker>

Then listen for emoji-click events:

document.querySelector('emoji-picker')
  .addEventListener('emoji-click', event => console.log(event.detail));

This will log:

{
  "emoji": {
    "annotation": "grinning face",
    "group": 0,
    "order": 1,
    "shortcodes": [ "gleeful" ],
    "tags": [ "face", "grin" ],
    "unicode": "😀",
    "version": 1,
    "emoticon": ":D"
  },
  "skinTone": 0,
  "unicode": "😀"
}

Styling

emoji-picker-element uses Shadow DOM, so its inner styling cannot be (easily) changed with arbitrary CSS. Refer to the API below for style customization.

Size

emoji-picker-element has a default size, but you can change it to whatever you want:

emoji-picker {
  width: 400px;
  height: 300px;
}

For instance, to make it expand to fit whatever container you give it:

emoji-picker {
  width: 100%;
  height: 100%;
}

Dark mode

By default, emoji-picker-element will automatically switch to dark mode based on prefers-color-scheme. Or you can add the class dark or light to force dark/light mode:

<emoji-picker class="dark"></emoji-picker>
<emoji-picker class="light"></emoji-picker>

CSS variables

Most colors and sizes can be styled with CSS variables. For example:

emoji-picker {
  --num-columns: 6;
  --emoji-size: 3rem;
  --background: gray;
}

Here is a full list of options:

Variable Default Default (dark) Description
--background #fff #222 Background of the entire <emoji-picker>
--border-color #e0e0e0 #444
--border-size 1px Width of border used in most of the picker
--button-active-background #e6e6e6 #555555 Background of an active button
--button-hover-background #d9d9d9 #484848 Background of a hovered button
--category-font-color #111 #efefef Font color of custom emoji category headings
--category-font-size 1rem Font size of custom emoji category headings
--emoji-padding 0.5rem
--emoji-size 1.375rem
--indicator-color #385ac1 #5373ec Color of the nav indicator
--indicator-height 3px Height of the nav indicator
--input-border-color #999 #ccc
--input-border-radius 0.5rem
--input-border-size 1px
--input-font-color #111 #efefef
--input-font-size 1rem
--input-line-height 1.5
--input-padding 0.25rem
--input-placeholder-color #999 #ccc
--num-columns 8 How many columns to display in the emoji grid
--outline-color #999 #fff Focus outline color
--outline-size 2px Focus outline width
--skintone-border-radius 1rem border radius of the skintone dropdown

Focus outline

For accessibility reasons, emoji-picker-element displays a prominent focus ring. If you want to hide the focus ring for non-keyboard users (e.g. mouse and touch only), then use the focus-visible polyfill, e.g.:

import 'focus-visible';

const picker = new Picker();
applyFocusVisiblePolyfill(picker.shadowRoot);

emoji-picker-element already ships with the proper CSS for both the :focus-visible standard and the polyfill.

Custom styling

If you absolutely must go beyond the styling API above, you can do something like this:

const style = document.createElement('style');
style.textContent = `/* custom shadow dom styles here */`
picker.shadowRoot.appendChild(style);

JavaScript API

Picker

Basic usage:

import { Picker } from 'emoji-picker-element';
const picker = new Picker();
document.body.appendChild(picker);

The new Picker(options) constructor supports several options:

Name Type Default Description
customEmoji CustomEmoji[] - Array of custom emoji
dataSource string "https://cdn.jsdelivr.net/npm/emojibase-data@5/en/data.json" URL to fetch the emojibase data from
i18n I18n - i18n object (see below for details)
locale string "en" Locale string
skinToneEmoji string "🖐️" The emoji to use for the skin tone picker

For instance:

const picker = new Picker({
  locale: 'fr',
  dataSource: '/fr-emoji.json'
})

These values can also be set at runtime, e.g.:

const picker = new Picker();
picker.dataSource = '/my-emoji.json';

i18n structure

Here is the default English i18n object ("en" locale):

{
  "categories": {
    "custom": "Custom",
    "smileys-emotion": "Smileys and emoticons",
    "people-body": "People and body",
    "animals-nature": "Animals and nature",
    "food-drink": "Food and drink",
    "travel-places": "Travel and places",
    "activities": "Activities",
    "objects": "Objects",
    "symbols": "Symbols",
    "flags": "Flags"
  },
  "categoriesLabel": "Categories",
  "emojiUnsupportedMessage": "Your browser does not support color emoji.",
  "favoritesLabel": "Favorites",
  "loadingMessage": "Loading…",
  "networkErrorMessage": "Could not load emoji. Try refreshing.",
  "regionLabel": "Emoji picker",
  "searchDescription": "When search results are available, press up or down to select and enter to choose.",
  "searchLabel": "Search",
  "searchResultsLabel": "Search results",
  "skinToneDescription": "When expanded, press up or down to select and enter to choose.",
  "skinToneLabel": "Choose a skin tone (currently {skinTone})",
  "skinTones": [
    "Default",
    "Light",
    "Medium-Light",
    "Medium",
    "Medium-Dark",
    "Dark"
  ],
  "skinTonesLabel": "Skin tones"
}

Note that some of these strings are only visible to users of screen readers. But you should still support them if you internationalize your app!

Database

You can work with the database API separately, which allows you to query emoji the same way that the picker does:

import { Database } from 'emoji-picker-element';

const database = new Database();
await database.getEmojiBySearchPrefix('elephant'); // [{unicode: "🐘", ...}]

Note that under the hood, IndexedDB data is partitioned based on the locale. So if you create two Databases with two different locales, it will store twice as much data.

Full API:

Constructors

constructor

+ new Database(__namedParameters: object): Database

Create a new Database.

Note that multiple Databases pointing to the same locale will share the same underlying IndexedDB connection and database.

Parameters:

Default value __namedParameters: object= {}

Name Type Default Description
customEmoji CustomEmoji[] [] Array of custom emoji
dataSource string "https://cdn.jsdelivr.net/npm/emojibase-data@5/en/data.json" URL to fetch the emojibase data from
locale string "en" Locale string

Returns: Database

Accessors

customEmoji

get customEmoji(): CustomEmoji[]

Return the custom emoji associated with this Database, or the empty array if none.

Returns: CustomEmoji[]

set customEmoji(customEmoji: CustomEmoji[]): void

Set the custom emoji for this database. Throws an error if custom emoji are not in the correct format.

Parameters:

Name Type Description
customEmoji CustomEmoji[]

Returns: void

Methods

close

close(): Promise‹void›

Closes the underlying IndexedDB connection. The Database is not usable after that (or any other Databases with the same locale).

Note that as soon as any other non-close/delete method is called, the database will automatically reopen.

Returns: Promise‹void›


delete

delete(): Promise‹void›

Deletes the underlying IndexedDB database. The Database is not usable after that (or any other Databases with the same locale).

Note that as soon as any other non-close/delete method is called, the database will be recreated.

Returns: Promise‹void›


getEmojiByGroup

getEmojiByGroup(group: number): Promise‹NativeEmoji[]›

Returns all emoji belonging to a group, ordered by order. Only returns native emoji; custom emoji don't belong to a group.

Non-numbers throw an error.

Parameters:

Name Type Description
group number the group number

Returns: Promise‹NativeEmoji[]›


getEmojiBySearchQuery

getEmojiBySearchQuery(query: string): Promise‹Emoji[]›

Returns all emoji matching the given search query, ordered by order.

Empty/null strings throw an error.

Parameters:

Name Type Description
query string search query string

Returns: Promise‹Emoji[]›


getEmojiByShortcode

getEmojiByShortcode(shortcode: string): Promise‹Emoji | null›

Return a single emoji matching the shortcode, or null if not found.

The colons around the shortcode should not be included when querying, e.g. use "slight_smile", not ":slight_smile:". Uppercase versus lowercase does not matter. Empty/null strings throw an error.

Parameters:

Name Type Description
shortcode string

Returns: Promise‹Emoji | null›


getEmojiByUnicodeOrName

getEmojiByUnicodeOrName(unicodeOrName: string): Promise‹Emoji | null›

Return a single native emoji matching the unicode string, or a custom emoji matching the name, or null if not found.

In the case of native emoji, the unicode string can be either the main unicode string, or the unicode of one of the skin tone variants.

Empty/null strings throw an error.

Parameters:

Name Type Description
unicodeOrName string unicode (native emoji) or name (custom emoji)

Returns: Promise‹Emoji | null›


getPreferredSkinTone

getPreferredSkinTone(): Promise‹SkinTone›

Get the user's preferred skin tone. Returns 0 if not found.

Returns: Promise‹SkinTone›


getTopFavoriteEmoji

getTopFavoriteEmoji(limit: number): Promise‹Emoji[]›

Get the top favorite emoji in descending order. If there are no favorite emoji yet, returns an empty array.

Parameters:

Name Type Description
limit number maximum number of results to return

Returns: Promise‹Emoji[]›


incrementFavoriteEmojiCount

incrementFavoriteEmojiCount(unicodeOrName: string): Promise‹void›

Increment the favorite count for an emoji by one. The unicode string must be non-empty. It should correspond to the base (non-skin-tone) unicode string from the emoji object, or in the case of custom emoji, it should be the name.

Parameters:

Name Type Description
unicodeOrName string unicode of a native emoji, or name of a custom emoji

Returns: Promise‹void›


ready

ready(): Promise‹void›

Resolves when the Database is ready, or throws an error if the Database could not initialize.

Note that you don't need to do this before calling other APIs – they will all wait for this promise to resolve before doing anything.

Returns: Promise‹void›


setPreferredSkinTone

setPreferredSkinTone(skinTone: SkinTone): Promise‹void›

Set the user's preferred skin tone. Non-numbers throw an error.

Parameters:

Name Type Description
skinTone SkinTone preferred skin tone

Returns: Promise‹void›

Events

emoji-click

The emoji-click event is fired when an emoji is selected by the user. Example format:

{
  emoji: {
    annotation: 'thumbs up',
    group: 1,
    order: 280,
    shortcodes: ['thumbsup', '+1', 'yes'],
    tags: ['+1', 'hand', 'thumb', 'up'],
    unicode: '👍️',
    version: 0.6,
    skins: [
      { tone: 1, unicode: '👍🏻', version: 1 },
      { tone: 2, unicode: '👍🏼', version: 1 },
      { tone: 3, unicode: '👍🏽', version: 1 },
      { tone: 4, unicode: '👍🏾', version: 1 },
      { tone: 5, unicode: '👍🏿', version: 1 }
    ]
  },
  skinTone: 4,
  unicode: '👍🏾'
}

And usage:

picker.addEventListener('emoji-click', event => {
  console.log(event.detail); // will log something like the above
});

Note that unicode will represent whatever the emoji should look like with the given skinTone. If the skinTone is 0, or if the emoji has no skin tones, then no skin tone is applied to unicode.

skin-tone-change

This event is fired whenever the user selects a new skin tone. Example format:

{
  skinTone: 5
}

And usage:

picker.addEventListener('skin-tone-change', event => {
  console.log(event.detail); // will log something like the above
})

Note that skin tones are an integer from 0 (default) to 1 (light) through 5 (dark).

Custom emoji

Both the Picker and the Database support custom emoji. Unlike regular emoji, custom emoji are kept in-memory. (It's assumed that they're small, and they might frequently change, so there's not much point in storing them in IndexedDB.)

Custom emoji should follow the format:

[
  {
    name: 'Garfield',
    shortcodes: ['garfield'],
    url: 'http://example.com/garfield.png',
    category: 'Cats'
  },
  {
    name: 'Heathcliff',
    shortcodes: ['heathcliff'],
    url: 'http://example.com/heathcliff.png',
    category: 'Cats'
  },
  {
    name: 'Scooby-Doo',
    shortcodes: ['scooby'],
    url: 'http://example.com/scooby.png',
    category: 'Dogs'
  }  
]

Note that names are assumed to be unique (case-insensitive), and it's assumed that the shortcodes have at least one entry.

The category is optional. If you don't provide it, then the custom emoji will appear in a single category called "Custom".

To pass custom emoji into the Picker:

const picker = new Picker({
  customEmoji: [/* ... */]
})

Or the Database:

const database = new Database({
  customEmoji: [/* ... */]
})

Custom emoji can also be set at runtime:

picker.customEmoji = [/* ... */ ]
database.customEmoji = [/* ... */ ]

Tree-shaking

If you want to import the Database without the Picker, or you want to code-split them separately, then do:

import Picker from 'emoji-picker-element/picker';
import Database from 'emoji-picker-element/database';

The reason for this is that Picker automatically registers itself as a custom element, following web component best practices. But this adds side effects, so bundlers like Webpack and Rollup do not tree-shake as well, unless the modules are imported from completely separate files.

Within a Svelte project

emoji-picker-element is explicitly designed as a custom element, and won't work as a direct Svelte component. However, if you're already using Svelte 3, then you can avoid importing Svelte twice by using:

import Picker from 'emoji-picker-element/svelte'

svelte.js is the same as picker.js, except it imports Svelte rather than bundling it.

Data and offline

Data source and JSON format

If you'd like to host the emoji JSON yourself, you can do:

npm install emojibase-data

Then host node_modules/emojibase-data/en/data.json (or other locales) on your web server.

emoji-picker-element requires the full emojibase-data JSON file, not the "compact" one (i.e. data.json, not compact.json).

It's recommended that your server expose an ETag header – if so, emoji-picker-element can avoid re-downloading the entire JSON file over and over again. Instead, it will do a HEAD request and just check the ETag.

If the server hosting the JSON file is not the same as the one containing the emoji picker, then the cross-origin server will also need to expose Access-Control-Allow-Origin: * and Access-Control-Allow-Headers: *. (Note that jsdelivr already does this, which is partly why it is the default.)

Unfortunately Safari does not currently support Access-Control-Allow-Headers, meaning that the ETag header will not be available cross-origin. In that case, emoji-picker-element will fall back to the less performant option. If you want to avoid this, host the JSON file on the same server as your web app.

Trimming the emojibase data

If you are hosting the JSON file yourself and would like it to be as small as possible, then you can use the utility trimEmojiData function:

import trimEmojiData from 'emoji-picker-element/trimEmojiData.js';
import emojiBaseData from 'emojibase-data/en/data.json';

const trimmedData = trimEmojiData(emojiBaseData);

Or if your version of Node doesn't support ES modules:

const trimEmojiData = require('emoji-picker-element/trimEmojiData.cjs');

Offline-first

emoji-picker-element uses a "stale while revalidate" strategy to update emoji data. In other words, it will use any existing data it finds in IndexedDB, and lazily update via the dataSource in case that data has changed. This means it will work offline-first the second time it runs.

If you would like to manage the database yourself (e.g. to ensure that it's correctly populated before displaying the Picker), then create a new Database instance and wait for its ready() promise to resolve:

const database = new Database();
try {
  await database.ready();
} catch (err) {
  // Deal with any errors (e.g. offline)
}

If emoji-picker-element fails to fetch the JSON data the first time it loads, then it will display an error message.

Design decisions

Some of the reasoning behind why emoji-picker-element is built the way it is.

IndexedDB

The emojibase-data English JSON file is 854kB, and the "compact" version is still 543kB. That's a lot of data to keep in memory just for an emoji picker. And it's not as if that number is ever going down; the Unicode Consortium keeps adding more emoji every year.

Using IndexedDB has a few advantages:

  1. We don't need to keep the full emoji data in memory at all times.
  2. After the first load, there is no need to download, parse, and index the JSON file again, because it's already available in IndexedDB.
  3. If you want, you can even load the IndexedDB data in a web worker, keeping the main thread free from non-UI data processing.

Note that because emoji-picker-element has a requirement on IndexedDB, it will not work in enviroments where IDB is unavailable, such as Firefox private browsing. See issue #9 for more details.

Native emoji

To avoid downloading a large sprite sheet that renders a particular emoji set – which may look out-of-place on different platforms, or may have IP issuesemoji-picker-element only renders native emoji. This means it is limited to the emoji actually installed on the user's device.

To avoid rendering ugly unsupported or half-supported emoji, emoji-picker-element will automatically detect emoji support and only render the supported characters. (So no empty boxes or awkward double emoji.) If no color emoji are supported by the browser/OS, then an error message is displayed (e.g. older browsers, some odd Linux configurations).

JSON loading

Browsers deal with JSON more efficiently when it's loaded via fetch() rather than embedded in JavaScript. It's faster for the browser to parse JSON than JavaScript, becuase the data is being parsed in the more tightly-constrained JSON format than the generic JavaScript format.

Plus, embedding the JSON directly would mean re-parsing the entire object on second load, which is something we want to avoid since the data is already in IndexedDB.

Browser support

emoji-picker-element only supports the latest versions of Chrome, Firefox, and Safari, as well as equivalent browsers (Edge, Opera, etc.). If you need support for older browsers, you will need polyfills for the following things (non-exhaustive list):

  • Custom elements
  • Shadow DOM
  • ES2019+

That said, older browsers may not have a color emoji font installed at all, so emoji-picker-element will not work in those cases.

Contributing

See CONTRIBUTING.md.

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