Message threading

Message threading is a feature that allows users to ask questions, give feedback or add context to a specific message without disrupting the conversation flow. A message thread refers to a collection of messages grouped together, consisting of a parent message and its replies. It can have the following elements:

• A message can have a thread of replies.
• A message that has a thread of replies is a parent message.
• A parent message and its threaded replies are collectively called a message thread.
• Every message within a thread, whether it's parent or reply, is a threaded message.
• A message that doesn't have any replies is an unthreaded message.

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Message threading can be widely used to help conversations flow smoothly while keeping users engaged. Message replies in a thread are common among popular messaging platforms, such as Slack and iMessage.

• Conversation flow: Without message threading, it's hard to specify which message a channel member is responding to. Users would have to explain the context of their response, potentially confusing other channel members and distracting them from reading new messages. Message threads can help everyone stay engaged and carry on their conversation without any interferences.

• In-depth discussions: By allowing users to reply to each other's messages in a thread, they can have more in-depth conversations on one topic. They're able to ask follow-up questions or provide more detailed explanations to a specific message without interrupting others in the channel. Message threads can encourage users to start topic-specific discussions separate from the main channel conversation.

Refer to the following limitations before using the message threading feature:

• SDK only supports 1-depth threads, meaning you can only add reply messages to non-reply messages. You can't add a reply to a reply message.
• You can only reply to text and file messages, not admin messages. However, you can add admin type messages as a reply to another message.

You can retrieve messages and their replies in a specific thread.

The load() method of a PreviousMessageListQuery instance returns a list of BaseMessage objects. Using this method, you can retrieve previous messages in a specific channel. If you want to include the replies of the target messages in the results, change the value of properties in the PreviousMessageListQuery instance.

The following table lists the properties of this class.

const query = channel.createPreviousMessageListQuery({
    limit: LIMIT,
    reverse: REVERSE,
    messageTypeFilter: MESSAGE_TYPE_FILTER,
    replyType: REPLY_TYPE,
    includeThreadInfo: INCLUDE_THREAD_INFO,
    includeParentMessageInfo: INCLUDE_PARENT_MESSAGE_INFO,
});
const messages = await query.load();

The getMessagesByTimestamp() method of a BaseChannel instance returns a list of BaseMessage objects. By using these methods, you can retrieve messages in a specific channel according to a MessageListParams object.

The following table lists the properties of this class.

const params = new MessageListParams({
    prevResultSize: PREV_RESULT_SIZE,
    nextResultSize: NEXT_RESULT_SIZE,
    isInclusive: INCLUSIVE,
    reverse: REVERSE,
    replyType: REPLY_TYPE,
    includeThreadInfo: INCLUDE_THREAD_INFO,
    includeParentMessageInfo: INCLUDE_PARENT_MESSAGE_INFO,
});

You can retrieve a set number of messages of previous and next messages on both sides of a specific timestamp in a channel by using the getMessagesByTimestamp() method.

const messages = await channel.getMessagesByTimestamp(TIMESTAMP, params);

You can retrieve replies of a parent message if you can determine the parent message like the following. First, create a ThreadMessageListParams object and set properties related to the thread where the target replies belong to.

const params = new ThreadedMessageListParams({
    prevResultSize: PREV_RESULT_SIZE,
    nextResultSize: NEXT_RESULT_SIZE,
    isInclusive: INCLUSIVE,
    reverse: REVERSE,
    includeParentMessageInfo: INCLUDE_PARENT_MESSAGE_INFO,
});

With the timestamp of the parent message, you can retrieve its replies by passing a TreadedMessageListParams object as an argument to the parameter in the getThreadedMessages() method.

const {
    parentMessage,
    threadedMessages,
} = await parentMessage.getThreadedMessages(TIMESTAMP, params);

You can retrieve a specific message by creating and passing the MessageRetrievalParams object to the getMessage() method as a parameter.

const params = new MessageRetrievalParams({
    messageId: MESSAGE_ID,
    channelType: CHANNEL_TYPE,  // Acceptable values are open and group.
    channelUrl: CHANNEL_URL,
});

const message = await sb.message.getMessage(params);

You can reply to a specific message in a channel through the sendUserMessage() or sendFileMessage() method. To do so, you should create a UserMessageCreateParams or a FileMessageCreateParams object and then specify the parentMessageId property of the object. Sending reply messages works the same way as sending regular messages to a channel except replies have an additional parentMessageId property.

When replying to a message through the sendUserMessage() method, specify and pass a UserMessageCreateParams object as an argument to a parameter in the method.

const params = new UserMessageCreateParams({
    parentMessageId: PARENT_MESSAGE_ID,
});

channel.sendUserMessage(params)
    .onSucceeded((message: UserMessage) => {
        // A reply to a specific message in the form of a text message is successfully sent.
    });

When replying with a file message through the sendFileMessage() method, specify and pass a FileMessageParams object as an argument to a parameter in the method.

const params = new FileMessageParams({
    file: FILE,
    parentMessageId: PARENT_MESSAGE_ID,
});

channel.sendFileMessage(params)
    .onSucceeded((message: FileMessage) => {
        // A reply to a specific message in the form of a file message is successfully sent.
    });

You can retrieve message changelogs.

Each message changelog has distinct properties such as a timestamp of when a message was updated and a unique ID of a deleted message. Based on these two properties, you can retrieve message changelogs in two different ways: either by timestamp or by token. Both getMessageChangeLogsSinceToken() and getMessageChangeLogsSinceTimestamp() methods require a parameter MessageChangeLogsParams object to determine what messages to return.

const params = new MessageChangeLogsParams({
    replyType: REPLY_TYPE,
    includeThreadInfo: INCLUDE_THREAD_INFO,
    includeParentMessageInfo: INCLUDE_PARENT_MESSAGE_INFO,
});

The following table lists the properties of this class.

You can retrieve the message changelogs by specifying a timestamp. The results will include changelogs that were created after the specified timestamp.

const {
    updatedMessages,
  deletedMessageIds,
  hasMore,
  token,
} = await channel.getMessageChangeLogsSinceTimestamp(TIMESTAMP, params);

You can also retrieve message changelogs by specifying a token. The token is an opaque string that marks the starting point of the next page in the result set and it is included in the callback of the previous call. Based on the token, the next page will start with changelogs that were created after the specified token.

const {
    updatedMessages,
  deletedMessageIds,
  hasMore,
  token,
} = await channel.getMessageChangeLogsSinceTimestamp(TIMESTAMP, params);

Once a reply is created or deleted from a thread, the onThreadInfoUpdated() in GroupChannelHandler or OpenChannelHandler is invoked. The method returns a ThreadInfoUpdateEvent object that has the latest information about the thread. This object needs to be applied to the parent message object.

Note: Like other messages, when a reply is created in a channel, the onMessageReceived() method of the channel event handler in client apps will be called.

handler.onThreadInfoUpdated = (channel: BaseChannel, threadInfoUpdateEvent: ThreadInfoUpdateEvent) => {
    // Look for a message that has threadInfoUpdateEvent.targetMessageId.
    // Apply the event to the message.
    message.applyThreadInfoUpdateEvent(threadInfoUpdateEvent);
};

If a reply message is created, onMessageReceived() will be called with that reply message. A user will have to find the parent message with the parentMessageID property in that message object.

If the parent message is not in the message view stack and the user wants to get the parent message object, they can do so by calling sb.message.getMessage(params, handler) to retrieve the parent message object.

Once the reply message has been created, the onThreadInfoUpdated() event handler will be called since the thread info has been changed. To update thread information, the user should find the matching parent message with targetMessageID and use the parentMessage.applyThreadInfoUpdateEvent() method.