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lexical-better-mentions

A mentions plugin for the lexical text editor.


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209
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lexical-better-mentions

[!NOTE] This is fork of sodenn/lexical-beautiful-mentions with 2 additions:

  1. The use LexicalTypeaheadMenuPlugin from @lexical/react PR
  2. Making it compatible with React 17 (which is possible by the above change)

The rest of this documentation is provided by the original author of the *-beautiful-* package, including the demo link. I simply adapted the rest of the instructions to the new package name, in order to publish it to npm.

Demo

A mentions plugin for the lexical editor. lexical is an extendable text editor for the web build by Meta. While the lexical playground offers a basic mentions plugin for demo purposes, this plugin is more advanced and offers more features.

  • Customizable triggers: Use characters, words or regular expressions as triggers for mentions.
  • Editing mentions outside the editor: Programmatically insert, delete, or rename mentions via the useBetterMentions hook.
  • Customizable mention style: You can change the look of the mentions via the editor theme to match the style of your application.
  • Automatic spacing: The plugin automatically adds spaces around the mentions, which makes it easier for the user to continue typing.
  • Adding new mentions: You can allow users to create new mentions that are not in the suggestion list.
  • Flexible way to provide mentions: You can use an async query function or a predefined list to provide mentions for the suggestion list.
  • Custom menu and menu item: You can customize the look and behavior of the menu that displays the mention suggestions.
  • Additional metadata: You can add additional metadata to the mention items, which will be included in the mention nodes when serializing the editor content.
  • Custom mention component: You can replace the default mention component with a custom component of your choice.

Installation

To install the plugin, run the following command:

// with npm
npm install lexical-better-mentions

// with yarn
yarn add lexical-better-mentions

You also need to install the lexical and @lexical/react, which is a peer dependency of this plugin.

Usage

Import the BetterMentionsPlugin plugin:

import { BetterMentionsPlugin, BetterMentionNode } from "lexical-better-mentions";

Add the plugin to the lexical editor:

import { LexicalComposer } from "@lexical/react/LexicalComposer";
import { PlainTextPlugin } from "@lexical/react/LexicalPlainTextPlugin";

const mentionItems = {
  "@": ["Anton", "Boris", "Catherine", "Dmitri", "Elena", "Felix", "Gina"],
  "#": ["Apple", "Banana", "Cherry", "Date", "Elderberry", "Fig", "Grape"],
  "due:": ["Today", "Tomorrow", "01-01-2023"],
};

const editorConfig = {
  // ...
  nodes: [BetterMentionNode] // 👈 register the mention node
};

return (
  <LexicalComposer initialConfig={editorConfig}>
    {/** ... */}
    <PlainTextPlugin // 👈 use the lexical RichTextPlugin for clipboard support
      contentEditable={/* ... */}
      placeholder={/* ... */}
      errorBoundary={/* ... */}
    />
    <BetterMentionsPlugin
      items={mentionItems}
    />
    {/** ... */}
  </LexicalComposer>
);

Customize mention style


import { BetterMentionsTheme } from "lexical-better-mentions";
// ...
const betterMentionsTheme: BetterMentionsTheme = {
  // 👇 use the trigger name as the key
  "@": "px-1 mx-px ...",
  // 👇 add the "Focused" suffix to style the focused mention
  "@Focused": "outline-none shadow-md ...",
  // 👇 use a configuration object if you need to apply different styles to trigger and value
  "due:": {
    trigger: "text-blue-400 ...",
    value: "text-orange-400 ...",
  },
}
const editorConfig = {
  // ...
  theme: {
    // ...
    betterMentions: betterMentionsTheme,
  },
};

// ...

return (
  <LexicalComposer initialConfig={editorConfig}>
    {/** ... */}
  </LexicalComposer>
);

Custom mention node and component

If applying styles via the theme is not enough, you can replace the BetterMentionNode by using the lexical Node Overrides API. This allows you to change the default behavior of the mention node:

export class CustomMentionsNode extends BetterMentionNode {
  static getType() {
    return "custom-betterMention";
  }
  static clone(node: CustomBetterMentionNode) {
    // TODO: implement
  }
  static importJSON(serializedNode: SerializedBetterMentionNode) {
    // TODO: implement
  }
  exportJSON(): SerializedBetterMentionNode {
    // TODO: implement
  }
  component(): ElementType<BetterMentionComponentProps> | null {
    // the component that renders the mention in the editor
    // return null to use the default component
    // 💡 if you only want to replace the component use the `createBetterMentionNode` helper method. See below for more details 👇
  }
  decorate(editor: LexicalEditor, config: EditorConfig): React.JSX.Element {
    // TODO: implement
  }
}
const editorConfig = {
  // ...
  nodes: [
    // Don't forget to register your custom node separately!
    CustomMentionsNode,
    {
      replace: BetterMentionNode,
      with: (node: BetterMentionNode) => {
        return new CustomMentionsNode(
          node.getTrigger(),
          node.getValue(),
          node.getData(),
        );
      }
    }
  ]
}

The plugin also provides a helper method that overrides the default BetterMentionNode and uses a customized version with a component of your choice:

const CustomMentionComponent = forwardRef<
  HTMLDivElement,
  BetterMentionComponentProps<MyData>
>(({ trigger, value, data: myData, children, ...other }, ref) => {
  return (
    <div {...other} ref={ref} title={trigger + value}>
      {value}
    </div>
  );
});
const editorConfig = {
  // ...
  nodes: [...createBetterMentionNode(CustomMentionComponent)],
};

Custom menu and menu item component


const CustomMenu = forwardRef<
  HTMLElement,
  BetterMentionsMenuProps
>(({ open, loading, ...props }, ref) => (
  <ul
    className="m-0 mt-6 ..."
    {...props}
    ref={ref}
  />
));

const CustomMenuItem = forwardRef<
  HTMLLIElement,
  BetterMentionsMenuItemProps
>(({ selected, item, ...props }, ref) => (
  <li
    className={`m-0 flex ... ${selected ? "bg-gray-100 ..." : "bg-white ..."}`}
    {...props}
    ref={ref}
  />
));

// ...

<BetterMentionsPlugin
  items={mentionItems}
  menuComponent={CustomMenu}
  menuItemComponent={CustomMenuItem}
/>

Additional metadata

Additional metadata can be used to uniquely identify mentions by adding an id or any other unique property to the mention items. When serializing the editor content, the metadata will be included in the mention nodes:

const mentionItems = {
  "@": [
    { value: "Catherine", id: "1", email: "catherine.a@example.com" },
    { value: "Catherine", id: "2", email: "catherine.b@example.com" },
    // ...
  ],
};

Serializes to the following lexical nodes:

[
  {
    "trigger": "@",
    "value": "Catherine",
    "data": {
      "id": "1",
      "email": "catherine.a@example.com"
    },
    "type": "betterMention",
    "version": 1
  },
  {
    "trigger": "@",
    "value": "Catherine",
    "data": {
      "id": "2",
      "email": "catherine.b@example.com"
    },
    "type": "betterMention",
    "version": 1
  }
]

All additional metadata are available as props of the BetterMentionsMenuItem component:

const CustomMenuItem = forwardRef<
  HTMLLIElement,
  BetterMentionsMenuItemProps
>(({ item: { data: { id, email }}, ...props }, ref) => (
 <li
  // ...
 />
));

Programmatically insert, delete, or rename mentions

import {
  BetterMentionsPlugin,
  useBetterMentions,
} from "lexical-better-mentions";

// ...

function MentionsToolbar() {
  const { removeMentions, insertMention } = useBetterMentions();
  return (
    <div className="grid gap-2 grid-cols-2">
      <Button onClick={() => removeMentions({ trigger: "#", value: "urgent" })}>
        Remove Mention
      </Button>
      <Button onClick={() => insertMention({ trigger: "#", value: "work" })}>
        Insert Mention
      </Button>
    </div>
  );
}

// ...

return (
  <LexicalComposer>
    {/** ... */}
    <BetterMentionsPlugin
      items={mentionItems}
    />
    <MentionsToolbar />
    {/** ... */}
  </LexicalComposer>
);

Disable creating new mentions

<BetterMentionsPlugin
  items={mentionItems}
  creatable={false} // 👈 hide the menu item that allows users to create new mentions
/>

Async query function

const queryMentions = async (trigger: string, query: string) => {
  const response = await fetch(
    `https://example.com/api/mentions?trigger=${trigger}&query=${query}`
  );
  const data = await response.json();
  return data as string[];
};

// ...

return (
  <LexicalComposer>
    {/** ... */}
    <BetterMentionsPlugin
      triggers={["@", "#"]} // needed to tell the plugin when to call the query function
      onSearch={queryMentions}
    />
    {/** ... */}
  </LexicalComposer>
);

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Last updated on 18 Feb 2024

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