Introduction

BlendVision JavaScript Messaging SDK provides functionalities for real-time messaging, admin-controlled bans, message deletion, and pinned announcements.

Installing

1. Get your chatroom token

You could get chatroom token and refresh token with BlendVision API.

2. Add dependency

via NPM

npm install @blendvision/chatroom-javascript-sdk@latest --save

via CDN

<script type="module">
  import 'https://unpkg.com/@blendvision/chatroom-javascript-sdk/index.min.js';
</script>

Configure BlendVision JavaScript SDK

1. Initialize the Chatroom

The init() method initializes the settings required for BlendVision Chatroom.

You could call the init() method on app startup, preferably in the index file.

via NPM

import { Chatroom } from '@blendvision/chatroom-javascript-sdk';

// For TypeScript user
import { ChatroomConfig } from '@blendvision/chatroom-javascript-sdk/type';

const chatToken = 'YOUR_CHATROOM_TOKEN';
const host = 'https://api.one.blendvision.com';
const refreshToken = 'YOUR_CHATROOM_REFRESH_TOKEN';

Chatroom.init({ chatToken, host, refreshToken }).then(
  (data: ChatroomConfig) => {
    console.log('Initialization completed successfully', data);
  },
  (error) => {
    console.log('Initialization failed with error:', error);
  }
);

via CDN

<script type="module">
  import 'https://unpkg.com/@blendvision/chatroom-javascript-sdk/index.min.js';

  const chatToken = 'YOUR_CHATROOM_TOKEN';
  const host = 'https://api.one.blendvision.com';
  const refreshToken = 'YOUR_CHATROOM_REFRESH_TOKEN';

  const { Chatroom } = window.BlendVisionChatroomSDK;

  Chatroom.init({ chatToken, host, refreshToken }).then(
    (data) => {
      console.log('Initialization completed successfully', data);
    },
    (error) => {
      console.log('Initialization failed with error:', error);
    }
  );
</script>

Parameters		Required	Description
chatToken		Required	The chatroom token is required for accessing and managing chatroom-related APIs. Additionally, this token has a validity period of 24 hours. Please considering your application's use case, it may be necessary to pass refresh token or integrate a refresh token mechanism to ensure continuous access.
host		Required	The host is the base URL for the chatroom APIs.
refreshToken		Optional	For the chatroom expected to last longer than 24 hours, please provide a refresh token to ensure a smooth user experience. Alternatively, you should handle the token refresh mechanism.
options	keepalive	Optional	The interval, in seconds, between keepalive pings sent to the server to ensure the connection remains active. The default is 60 seconds, set to 0 to disable.
	reconnectPeriod	Optional	The interval, in milliseconds, between reconnection attempts if the connection is lost. The default is 1000 milliseconds (1 second). Setting this to 0 disables automatic reconnections.
	connectTimeout	Optional	The maximum time, in milliseconds, the client will wait for a CONNACK response from the broker after sending a connection request. The default is 30 * 1000 milliseconds (30 seconds).
	serverBatchInterval	Optional	The interval, in milliseconds, applies to custom messages with a counter. Messages are accumulated up to this interval before being sent to the server. The default interval is 5000 milliseconds (5 seconds).
	clientBatchInterval	Optional	The interval, in milliseconds, applies to custom messages with a counter as well. To prevent the user from experiencing delays, the user's own messages can be updated faster than the server setting, minimizing the perceived delay in replies. This mechanism also helps protect your front-end from updating too frequently. The default is 2000 milliseconds (2 seconds).

Responses

The response data type for the API call is structured as follows:

interface User {
  id: string;
  deviceId: string;
  customName: string;
  isAdmin: boolean;
}

interface BlockedUser {
  blockedUser: User;
  actionTaker: string;
}

interface TextMessage {
  id: string;
  text: string;
  sender: User;
}

interface PinnedMessage {
  textMessage: TextMessage;
  actionTaker: string;
}

interface ViewerInfo {
  enabled: boolean;
  count: number;
  version: number;
  updatedAt: string;
}

interface CustomCounter {
  key: string;
  value: number;
  version: number;
  updatedAt: string;
  disabled: boolean;
}

interface ChatroomType {
  id: string;
  muted: boolean;
  blockedUsers: BlockedUser[];
  pinnedMessages: PinnedMessage[];
  viewerInfo: ViewerInfo;
  customCounters: CustomCounter[];
  createdAt: string;
  updatedAt: string;
}

interface ChatroomConfig {
  user: User;
  chatroom: ChatroomType;
}

Cleanup with disconnect() method

The chatroom needs to be cleaned up to prevent memory leaks and ensure optimal browser performance. You can achieve this by using the disconnect() method to destroy the chatroom instance.

Chatroom.disconnect();

2. Handle Received Messages with register()

// For TypeScript user
import { ReceivedMessage, ReceivedMessageText } from '@blendvision/chatroom-javascript-sdk/type';
import { IConnackPacket, IDisconnectPacket, ErrorWithReasonCode } from 'mqtt';

Chatroom.register({
  // Connection Status
  onConnect: (packet: IConnackPacket) => {
    console.log('The chatroom is successfully connected', packet);
  },
  onDisconnect: (packet: IDisconnectPacket) => {
    console.log('The chatroom is disconnected', packet);
  },
  onReconnect: () => {
    console.log('The chatroom is reconnecting');
  },
  onError: (error: Error | ErrorWithReasonCode) => {
    console.log('The chatroom failed to connect', error);
  },
  // Interaction Message
  onTextReceived: (textMessage: ReceivedMessageText) => {
    console.log('onTextReceived', textMessage);
  },
  onMuteReceived: (message: ReceivedMessage) => {
    console.log('onMuteReceived', 'The chatroom is muted by', message.user.customName);
  },
});

Connection Status

You could check the Packet type here. If there is a connection error, the reason code could be found in here.

Interaction Message

The basic interaction message type is:

interface User {
  id: string;
  deviceId: string;
  customName: string;
  isAdmin?: boolean;
}

enum InteractionType {
  Text = 'INTERACTION_TYPE_TEXT',
  Custom = 'INTERACTION_TYPE_CUSTOM',
  CustomCounterUpdate = 'INTERACTION_TYPE_CUSTOM_COUNTER_UPDATE',
  Mute = 'INTERACTION_TYPE_MUTE',
  Unmute = 'INTERACTION_TYPE_UNMUTE',
  Pin = 'INTERACTION_TYPE_PIN_MESSAGE',
  Unpin = 'INTERACTION_TYPE_UNPIN_MESSAGE',
  Block = 'INTERACTION_TYPE_BLOCK_USER',
  Unblock = 'INTERACTION_TYPE_UNBLOCK_USER',
  Delete = 'INTERACTION_TYPE_DELETE_MESSAGE',
  ViewerInfoEnabled = 'INTERACTION_TYPE_VIEWER_INFO_ENABLED',
  ViewerInfoDisabled = 'INTERACTION_TYPE_VIEWER_INFO_DISABLED',
  ViewerInfoUpdate = 'INTERACTION_TYPE_VIEWER_INFO_UPDATE',
  Broadcast = 'INTERACTION_TYPE_BROADCAST_UPDATE',
}

interface ReceivedMessage {
  id: string;
  type: InteractionType;
  user: User;
  sentAt: string; // Timestamp indicating when the message was received by the SDK.
  receivedAt: string; // Timestamp indicating when the message reached the server.
}

Text Message

The register() function is necessary since the message needs to be managed.

Function	Required	Interaction Type	Description
onTextReceived	Required	INTERACTION_TYPE_TEXT	The text message.

interface ReceivedMessageText extends ReceivedMessage {
  type: InteractionType.Text;
  text: string;
}

Custom Message

Function	Required	Interaction Type	Description
onCustomReceived	Optional	INTERACTION_TYPE_CUSTOM	The custom message.

interface ReceivedMessageCustom extends ReceivedMessage {
  type: InteractionType.Custom;
  value: string; // usually structure in JSON format
}

Custom Counter Message

The message would be sent with the batch setting by default, the batching interval could be adjusted here.

Function	Required	Interaction Type	Description
onCustomCounterReceived	Optional	INTERACTION_TYPE_CUSTOM	The custom counter message.

interface ReceivedMessageCustomCounter extends ReceivedMessage {
  type: InteractionType.Custom;
  key: string; // the key that set up when create chatroom
  value: string; // usually structure in JSON format, would be empty string if no value provided
}

Custom Counter Update

The actual value of the counter would be updated by the function.

When you update the counter using the chatroom API, the SDK automatically receives the event update through this function.

Function	Required	Interaction Type	Description
onCustomCounterUpdateReceived	Optional	INTERACTION_TYPE_CUSTOM_COUNTER_UPDATE	Update the custom counter's value or disable.

interface ReceivedMessageCustomCounterUpdate extends ReceivedMessage {
  type: InteractionType.CustomCounterUpdate;
  key: string; // Indicate the key of counter
  value: string; // Indicate the actual amount of counter
  version: number;
  updatedAt: string;
  disabled: boolean; // Would be true if the counter key has been removed
}

Mute the chatroom

Function	Required	Interaction Type	Description
onMuteReceived	Optional	INTERACTION_TYPE_MUTE	The chatroom is muted, viewers can not send message.
onUnmuteReceived	Optional	INTERACTION_TYPE_UNMUTE	The chatroom is unmuted.

No extra information would be sent with the mute / unmute message.

Pin / Unpin a message

Function	Required	Interaction Type	Description
onPinMessageReceived	Optional	INTERACTION_TYPE_PIN_MESSAGE	The message is pinned.
onUnpinMessageReceived	Optional	INTERACTION_TYPE_UNPIN_MESSAGE	The message is unpinned.

interface User {
  id: string;
  deviceId: string;
  customName: string;
  isAdmin?: boolean;
}

interface ReceivedMessagePin extends ReceivedMessage {
  type: InteractionType.Pin | InteractionType.Unpin;
  pinUnpinMessage: {
    textMessage: {
      id: string;
      text: string;
      sender: User;
    };
    actionTaker: string;
  };
}

Block / Unblock User

Function	Required	Interaction Type	Description
onBlockUserReceived	Optional	INTERACTION_TYPE_BLOCK_USER	The user is blocked.
onUnblockUserReceived	Optional	INTERACTION_TYPE_UNBLOCK_USER	The user is unblocked.

interface User {
  id: string;
  deviceId: string;
  customName: string;
  isAdmin?: boolean;
}

interface ReceivedMessageBlockUnblock extends ReceivedMessage {
  type: InteractionType.Block | InteractionType.Unblock;
  blockUnblockMessage: {
    user: User;
    actionTaker: string;
  };
}

Delete Message

Function	Required	Interaction Type	Description
onDeleteMessageReceived	Optional	INTERACTION_TYPE_DELETE_MESSAGE	The message is deleted.

interface ReceivedMessageDelete extends ReceivedMessage {
  type: InteractionType.Delete;
  deletedMessage: {
    id: string;
    actionTaker: string;
  };
}

Viewer Info

Function	Required	Interaction Type	Description
onViewerInfoReceived	Optional	INTERACTION_TYPE_VIEWER_INFO_ENABLED	Show concurrent users count update to viewer.
		INTERACTION_TYPE_VIEWER_INFO_DISABLED	Hide concurrent users count update to viewer.
		INTERACTION_TYPE_VIEWER_INFO_UPDATE	If viewerInfo is enabled, both admins and viewers will receive viewer info updates. Otherwise, only admin users will receive them.

interface ViewerInfoMessage extends ReceivedMessage {
  type: InteractionType.Update | InteractionType.Enabled | InteractionType.Disabled;
  viewerInfo: {
    enabled: boolean; // Indicates whether viewer information is enabled. Default value is false.
    count: number; // Represents the number of viewers.
    updatedAt: string;
    version: number; // The version number of the viewer information. A larger number represents a newer version.
  };
}

Broadcast

Function	Required	Interaction Type	Description
onBroadcastReceived	Optional	INTERACTION_TYPE_BROADCAST_UPDATE	When received the concurrent viewer (unique viewer identified by id) update and total viewer update.

interface Metrics {
  count: number;
  updatedAt: string;
}

interface ReceivedMessageBroadcast extends ReceivedMessage {
  type: InteractionType.Broadcast;
  viewerMetrics: {
    concurrent: Metrics;
    total: Metrics;
  };
}

3. General Action's API

The actions could be called from both admin and viewer users.

Text message

const textMessage = {
  text: 'Here is a message',
};

Chatroom.sendTextMessage(textMessage).then(
  () => {
    console.log('Message sent successfully');
  },
  (error) => {
    console.log('Message sending failed with error:', error);
  }
);

Parameter	Required	Description
text	Required	String. The maximum length of text message is 1000.

Custom message

const customMessage = {
  value: 'ANY CUSTOM VALUE YOU MAY HAVE',
};

Chatroom.sendCustomMessage(customMessage).then(
  () => {
    console.log('Message sent successfully');
  },
  (error) => {
    console.log('Message sending failed with error:', error);
  }
);

Parameter	Required	Description
value	Required	String. The custom value that you want to send with chatroom service.

Custom counter message

const customCounterMessage = {
  key: 'like',
  value: 'ANY CUSTOM VALUE YOU MAY HAVE',
};

Chatroom.sendCustomCounterMessage(customCounterMessage).then(
  () => {
    console.log('Message sent successfully');
  },
  (error) => {
    console.log('Message sending failed with error:', error);
  }
);

Parameter	Required	Description
key	Required	String. The key of increment count that you set when creating chatroom.
value	Optional	The custom value that you want to bring with the counter. Usually structure in JSON String.

Retrieve Chat Message History

The default without any query parameters will retrieve 100 messages from the latest to the oldest, and can continue to retrieve the next 100 messages by providing the beforeAt query parameter which can assign the receivedAt value of the first message from the previous response. If the response returns an empty array, it means no more message in the condition.

Only the INTERACTION_TYPE_TEXT, INTERACTION_TYPE_CUSTOM would be list.

Example 1

interface ReceivedHistoryMessage = ReceivedTextMessage | ReceivedCustomMessage

Chatroom.getChatMessages().then(
  (data: ReceivedHistoryMessage[])=>{
    console.log('Messages:', data)
    // Will get the latest 100 messages by default.
  },
  (error)=>{
    console.log('Get messages failed with error:', error);
  }
);

Example 2

function getYesterdayISOString() {
  const currentDate = new Date();
  currentDate.setDate(currentDate.getDate() - 1);
  return currentDate.toISOString();
}

const params = {
  afterAt: getYesterdayISOString(),
  limit: 50,
  fromOldest: true,
};

Chatroom.getChatMessages({ afterAt, limit, fromOldest }).then(
  (data: ReceivedHistoryMessage[]) => {
    console.log('Messages:', data);
    // Will get the oldest 50 messages after yesterday time.
  },
  (error) => {
    console.log('Get messages failed with error:', error);
  }
);

Parameter	Required	Description
beforeAt	Optional	List the messages before the time, default is current time. Will list from the latest in the chatroom if not provided.
limit	Optional	Number. The number of messages to retrieve. The default is 100.
afterAt	Optional	List the messages after the time. Will list from the latest until the time by default. If it is required to list from the setting time, please set the fromOldest to true.
fromOldest	Optional	Boolean. Indicate the list direction between interval. The default is false, will list messages from latest to oldest.

Further explanation of the parameters

• Assume there are chat messages existing in a chatroom, and have set the after_at and before_at boundary to list as follows:

m1 m2 m3 m4 m5 m6 m7 m8 m9 m10
   ^                 ^
   after_at          before_at

1. from_oldest=false, limit=2 => [m6, m7]

2. from_oldest=true, limit=2 => [m3, m4]

• Assume there are chat messages existing in a chatroom, and haven't set the after_at and before_at boundary to list as follows:

m1 m2 m3 m4 m5 m6 m7 m8 m9 m10

1. from_oldest=false, limit=2 => [m9, m10]

2. from_oldest=true, limit=2 => [m1, m2]

4. Admin Action's API

The actions could be called from admin users only.

Mute & Unmute the Chatroom

The admin user could mute & unmute the chatroom. Viewer user's message would be limited, only admin user could send message when the chatroom is muted.

// Mute the chat room. `onMuteReceived` would receive interaction message upon success.
Chatroom.mute();

// Unmute the chat room. `onUnmuteReceived` would receive interaction message upon success.
Chatroom.unmute();

Block & Unblock a User

The admin user could block / unblock a certain user. If a user in blocked, the user's future message would be hidden to other viewer users, and added 'blocked' label when sent to admin user.

// Block a user. `onBlockUserReceived` would receive interaction message upon success.
const userForBlock = {
  id: 'USER_ID_FOR_BLOCK',
  deviceId: 'USER_DEVICE_ID_FOR_BLOCK',
  customName: 'USER_CUSTOM_NAME_FOR_BLOCK',
};
Chatroom.blockUser(userForBlock);

// Unblock a user. `onUnblockUserReceived` would receive interaction message upon success.
const id = 'USER_ID_FOR_UNBLOCK';
Chatroom.unblockUser({ id });

Delete a Message

The admin user could delete specific message within the chatroom. If a message is deleted, user would receive its id.

// Delete a message. `onDeleteMessageReceived` would receive interaction message upon success.
const messageForDelete = {
  id: 'MESSAGE_FOR_DELETE_ID',
  sentAt: 'MESSAGE_FOR_DELETE_SENT_AT', //optional. would improve the message delete time.
  receivedAt: 'MESSAGE_FOR_DELETE_RECEIVED_AT', //optional. would improve the message delete time.
};
Chatroom.deleteMsg(messageForDelete);

Pin & Unpin a Message

The admin could pin / unpin a specific message within the chatroom.

// Pin a message. `onPinMessageReceived` would receive interaction message upon success.
const messageForPin = {
  id:'MESSAGE_ID';
  text:'MESSAGE_TEXT';
  sender:{
    id:'MESSAGE_SENDER_ID';
    deviceId:'MESSAGE_SENDER_DEVICE_ID';
    customName:'MESSAGE_SENDER_CUSTOM_NAME';
  };
}
Chatroom.pinMessage(messageForPin);

// Unpin a message. `onUnpinMessageReceived` would receive interaction message upon success.
const id = 'UNPIN_MESSAGE_ID';
Chatroom.unpinMessage({ id });

Show & Hide viewer info

Modify the visibility of viewer info in the chatroom.

If true, the user could receive the viewer info update; on the other hand, the viewer info would be invisible for viewer user.

// Update viewer info. `onUpdateViewerInfoReceived` would receive interaction message upon success.
const viewerInfo = {
  enabled: false,
};
Chatroom.updateViewerInfo(viewerInfo);

Update a user

The admin users could update their custom name by the function.

// Update a user.
const customName = 'Bella';
Chatroom.updateUser({ customName });