Mention

Mention is a feature that allows users to call out each other in a message within a group channel. Users can mention other members in the group channel to get their attention and directly notify that they've been mentioned in a message.

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The mention feature currently has the following limitations:

• User is the only mention type that Sendbird UIKit provides.
• Users can only mention other users in the same channel.
• Users can mention up to 10 users in a single message.

To turn on the feature, refer to the code below:

import { SendbirdUIKitContainer } from '@sendbird/uikit-react-native';
const App = () => {
  return <SendbirdUIKitContainer chatOptions={{ enableUserMention: true }} />;
};

The mention feature has basic settings that you can customize when implementing it in your client app. The maximum number of times you can mention the same user or multiple users in one message is 10. The maximum number of users shown in a suggested mention list is set to 15 by default. These numbers are customizable through userMention, which contains mentionLimit and suggestionLimit properties.

import { SendbirdUIKitContainer } from '@sendbird/uikit-react-native';
const App = () => {
    return <SendbirdUIKitContainer userMention={{ mentionLimit: 10, suggestionLimit: 15 }} />;
};

Users can mention other users in the same channel by either searching for the channel member or typing in the user's nickname. When a user types @ in the Input component of GroupChannelModule, a suggested mention list view appears in the group channel screen. The suggested mention list contains a scrollable list of all channel members by their nickname or user ID. The list also appears while the user types the nickname of a channel member. As the nickname is being typed, the list sorts the nicknames alphabetically in real-time.

The suggested mention list shows an alphabetical list of all channel members that you can mention in a message. For each member in the list, the profile image, nickname, and user ID are shown by default. You can choose to display either just the nickname or both nickname and user ID. The suggested mention list disappears once a user has been successfully mentioned in a message or when there's no matching nickname found in the list. If there's a typo while typing in a user's nickname or if the user's not a member of the current group channel, the mention list also disappears.

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If a user reaches the value of mentionLimit, a warning guide appears in the suggested mention list view.

When you type @ and a user nickname in the Input component of GroupChannelModule, the suggested mention list appears. While the list can display both nickname and user ID, you can only type nicknames in the message input field to mention a user. The same user can be mentioned up to 10 times per message by default and the text of each user mention is bolded.

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When a user is mentioned in a message, the unread message count in the List component of GroupChannelListModule increases by the number of unread mentioned messages. The unreadMentionCount property specifies the number of unread mentioned messages in a channel and gets added to the total unread message count. A mention badge also appears to the left of the unread message count number to indicate that the user has been mentioned in the unread message. Regardless of the number of unread mentioned messages, if there's at least one unread mentioned message in a channel, the mention badge appears in the channel list.

Once the user taps on the channel with the unread mentioned message, they can see all the messages in the MessageList component of GroupChannelModule where the highlighted user's nickname appears. The nickname is highlighted only in messages that mention the current user.

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Users can tap on each mentioned nickname in a message to see the user profile of the mentioned channel member. The user profile includes a profile image, nickname, and user ID.

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The option to turn on notifications for mentions only has been added to the View component of GroupChannelNotificationsModule. In order to move to the group channel notifications screen from the group channel settings screen, you need to pass a new function to the onPressMenuNotification prop. This prop is called when the Notification option is tapped in the Menu component of GroupChannelSettingsModule. You can build GroupChannelNotificationsFragment through the createGroupChannelNotificationsFragment method.

If you turn on push notifications for the channel using the toggle button, two options will appear below: all new messages and mentions only. All new messages include notifications for both non-mentioned messages and mentioned messages, whereas mentions only refer to notifications for just mentioned messages.

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You can customize the UI for mention in the Input component of GroupChannelModule, the Menu component of GroupChannelSettingsModule, and the components of GroupChannelNotificationsModule through the string resource and icon resource.

The following table shows customizable properties of StringSet.

interface StringSet {
    GROUP_CHANNEL: {
        MENTION_LIMITED: (mentionLimit: number) => string;
    };
    GROUP_CHANNEL_SETTINGS: {
        MENU_NOTIFICATION: string;
        MENU_NOTIFICATION_LABEL_ON: string;
        MENU_NOTIFICATION_LABEL_OFF: string;
        MENU_NOTIFICATION_LABEL_MENTION_ONLY: string;
    };
    GROUP_CHANNEL_NOTIFICATIONS: {
        HEADER_TITLE: string;
        MENU_NOTIFICATIONS: string;
        MENU_NOTIFICATIONS_DESC: string;
        MENU_NOTIFICATIONS_OPTION_ALL: string;
        MENU_NOTIFICATIONS_OPTION_MENTIONS_ONLY: string;
    };
}

The following table shows customizable mention icons.

import { Icon } from '@sendbird/uikit-react-native-foundation';

Icon.Assets['info'] = require('your_icons/info_icon.png');
Icon.Assets['radio-on'] = require('your_icons/radio-on_icon.png');
Icon.Assets['radio-off'] = require('your_icons/radio-off_icon.png');