By using the getUnreadMemberCount() method, you can get the number of members who haven't read a specific message in a group channel. To get the most up-to-date value, the channel should be updated first through markAsRead() before calling the getUnreadMemberCount() method.
const count: number = channel.getUnreadMemberCount();
// ...
// To listen to an update from all client apps of channel members, implement the onUnreadMemberStatusUpdated() method with following behaviors to perform when notified.
const channelHandler = new GroupChannelHandler({
onUnreadMemberStatusUpdated: (channel: GroupChannel) => {
// ...
for (const message of messages) {
const unreadCount: number = channel.getUnreadMemberCount(message);
if (unreadCount <= 0) {
// All members have read the message.
} else {
// Some of members haven't read the message yet.
}
}
},
});
sb.groupChannel.addGroupChannelHandler(UNIQUE_HANDLER_ID, channelHandler);