All Real Time Listeners - CometChat Docs

AI Integration Quick Reference

// User Listener — online/offline presence
CometChat.addUserListener("ID", new CometChat.UserListener({
  onUserOnline: (user) => { },
  onUserOffline: (user) => { }
}));

// Message Listener — messages, typing, receipts, reactions
CometChat.addMessageListener("ID", new CometChat.MessageListener({
  onTextMessageReceived: (msg) => { },
  onMediaMessageReceived: (msg) => { },
  onTypingStarted: (indicator) => { },
  onMessagesRead: (receipt) => { }
}));

// Group Listener — member join/leave/kick/ban/scope changes
CometChat.addGroupListener("ID", new CometChat.GroupListener({
  onGroupMemberJoined: (action, joinedUser, joinedGroup) => { },
  onGroupMemberLeft: (action, leftUser, leftGroup) => { }
}));

// Call Listener — incoming/outgoing call events
CometChat.addCallListener("ID", new CometChat.CallListener({
  onIncomingCallReceived: (call) => { },
  onOutgoingCallAccepted: (call) => { }
}));

// Always clean up
CometChat.removeUserListener("ID");
CometChat.removeMessageListener("ID");
CometChat.removeGroupListener("ID");
CometChat.removeCallListener("ID");

Real-time listeners let you receive live events — messages, presence changes, group updates, and call signals — as they happen. The pattern is the same for all four listener types:

Register a listener with a unique ID using addXListener()
Handle events in the callback methods
Remove the listener with removeXListener() when it’s no longer needed

Each listener ID must be unique. Re-registering with the same ID replaces the previous listener. Always remove listeners on component unmount or page navigation to prevent memory leaks.

Always remove listeners when they’re no longer needed (e.g., on component unmount or page navigation). Failing to remove listeners can cause memory leaks and duplicate event handling.

CometChat provides 4 listeners viz.

User Listener

Receive online/offline presence events for users.

Method	Information
onUserOnline(user: CometChat.User)	This method is triggered when a user comes online and is available to chat. The details of the user can be obtained from the user object received as the method parameter.
onUserOffline(user: CometChat.User)	This method is triggered when a user goes offline. The details of the user can be obtained from the User object received as the parameter.

To add the UserListener:

TypeScript
JavaScript

const listenerID: string = "UNIQUE_LISTENER_ID";
CometChat.addUserListener(
  listenerID,
  new CometChat.UserListener({
    onUserOnline: (onlineUser: CometChat.User) => {
      /* when someuser/friend comes online, user will be received here */
      console.log("On User Online:", { onlineUser });
    },
    onUserOffline: (offlineUser: CometChat.User) => {
      /* when someuser/friend went offline, user will be received here */
      console.log("On User Offline:", { offlineUser });
    },
  })
);

const listenerID = "UNIQUE_LISTENER_ID";
CometChat.addUserListener(
  listenerID,
  new CometChat.UserListener({
    onUserOnline: (onlineUser) => {
      console.log("On User Online:", { onlineUser });
    },
    onUserOffline: (offlineUser) => {
      console.log("On User Offline:", { offlineUser });
    },
  })
);

Remove the listener when no longer needed:

TypeScript
JavaScript

let listenerID: string = "UNIQUE_LISTENER_ID";
CometChat.removeUserListener(listenerID);

let listenerID = "UNIQUE_LISTENER_ID";
CometChat.removeUserListener(listenerID);

Group Listener

Receive events when group members join, leave, are kicked/banned, or have their scope changed.

Method	Information
onGroupMemberJoined(action: CometChat.Action, joinedUser: CometChat.User, joinedGroup: CometChat.Group)	This method is triggered when a user joins any group. All the members present in the group will receive this event.
onGroupMemberLeft(action: CometChat.Action, leftUser: CometChat.User, leftGroup: CometChat.Group)	This method is triggered when a user who was a member of any group leaves the group. All the members of the group receive this event.
onGroupMemberKicked(action: CometChat.Action, kickedUser: CometChat.User, kickedBy: CometChat.User, kickedFrom: CometChat.Group)	This method is triggered when a user is kicked from a group. All the members including the user receive this event
onGroupMemberBanned(action: CometChat.Action, bannedUser: CometChat.User, bannedBy: CometChat.User, bannedFrom: CometChat.Group)	This method is triggered when a user is banned from a group. All the members including the user receive this event
onGroupMemberUnbanned(action: CometChat.Action, unbannedUser: CometChat.User, unbannedBy: CometChat.User, unbannedFrom: CometChat.Group)	This method is triggered when a user is banned from a group. All the members of the group receive this event.
onGroupMemberScopeChanged(action: CometChat.Action, changedUser: CometChat.User, newScope: string, oldScope: string, changedGroup: CometChat.Group)	This method is triggered when the scope of any Group Member has been changed. All the members that are a part of that group receive this event
onMemberAddedToGroup(action: CometChat.Action, userAdded: CometChat.User, addedBy: CometChat.User, addedTo: CometChat.Group)	This method is triggered when a user is added to any group. All the members including the user himself receive this event.

To add the GroupListener:

TypeScript
JavaScript

CometChat.addGroupListener(
  "UNIQUE_LISTENER_ID",
  new CometChat.GroupListener({
    onGroupMemberJoined: (
      message: CometChat.Action,
      joinedUser: CometChat.User,
      joinedGroup: CometChat.Group
    ) => {
      console.log("onGroupMemberJoined", { message, joinedUser, joinedGroup });
    },
    onGroupMemberLeft: (
      message: CometChat.Action,
      leftUser: CometChat.User,
      leftGroup: CometChat.Group
    ) => {
      console.log("onGroupMemberLeft", { message, leftUser, leftGroup });
    },
    onGroupMemberKicked: (
      message: CometChat.Action,
      kickedUser: CometChat.User,
      kickedBy: CometChat.User,
      kickedFrom: CometChat.Group
    ) => {
      console.log("onGroupMemberKicked", {
        message,
        kickedUser,
        kickedBy,
        kickedFrom,
      });
    },
    onGroupMemberBanned: (
      message: CometChat.Action,
      bannedUser: CometChat.User,
      bannedBy: CometChat.User,
      bannedFrom: CometChat.Group
    ) => {
      console.log("onGroupMemberBanned", {
        message,
        bannedUser,
        bannedBy,
        bannedFrom,
      });
    },
    onGroupMemberUnbanned: (
      message: CometChat.Action,
      unbannedUser: CometChat.User,
      unbannedBy: CometChat.User,
      unbannedFrom: CometChat.Group
    ) => {
      console.log("onGroupMemberUnbanned", {
        message,
        unbannedUser,
        unbannedBy,
        unbannedFrom,
      });
    },
    onGroupMemberScopeChanged: (
      message: CometChat.Action,
      changedUser: CometChat.User,
      newScope: string,
      oldScope: string,
      changedGroup: CometChat.Group
    ) => {
      console.log("onGroupMemberScopeChanged", {
        message,
        changedUser,
        newScope,
        oldScope,
        changedGroup,
      });
    },
    onMemberAddedToGroup: (
      message: CometChat.Action,
      userAdded: CometChat.User,
      addedby: CometChat.User,
      addedTo: CometChat.Group
    ) => {
      console.log("onMemberAddedToGroup", {
        message,
        userAdded,
        addedby,
        addedTo,
      });
    },
  })
);

CometChat.addGroupListener(
  "UNIQUE_LISTENER_ID",
  new CometChat.GroupListener({
    onGroupMemberJoined: (message, joinedUser, joinedGroup) => {
      console.log("onGroupMemberJoined", { message, joinedUser, joinedGroup });
    },
    onGroupMemberLeft: (message, leftUser, leftGroup) => {
      console.log("onGroupMemberLeft", { message, leftUser, leftGroup });
    },
    onGroupMemberKicked: (message, kickedUser, kickedBy, kickedFrom) => {
      console.log("onGroupMemberKicked", {
        message,
        kickedUser,
        kickedBy,
        kickedFrom,
      });
    },
    onGroupMemberBanned: (message, bannedUser, bannedBy, bannedFrom) => {
      console.log("onGroupMemberBanned", {
        message,
        bannedUser,
        bannedBy,
        bannedFrom,
      });
    },
    onGroupMemberUnbanned: (
      message,
      unbannedUser,
      unbannedBy,
      unbannedFrom
    ) => {
      console.log("onGroupMemberUnbanned", {
        message,
        unbannedUser,
        unbannedBy,
        unbannedFrom,
      });
    },
    onGroupMemberScopeChanged: (
      message,
      changedUser,
      newScope,
      oldScope,
      changedGroup
    ) => {
      console.log("onGroupMemberScopeChanged", {
        message,
        changedUser,
        newScope,
        oldScope,
        changedGroup,
      });
    },
    onMemberAddedToGroup: (message, userAdded, addedby, addedTo) => {
      console.log("onMemberAddedToGroup", {
        message,
        userAdded,
        addedby,
        addedTo,
      });
    },
  })
);

Remove the listener when no longer needed:

TypeScript
JavaScript

let listenerID: string = "UNIQUE_LISTENER_ID";
CometChat.removeGroupListener(listenerID);

let listenerID = "UNIQUE_LISTENER_ID";
CometChat.removeGroupListener(listenerID);

Message Listener

Receive events for incoming messages, typing indicators, read/delivery receipts, message edits/deletes, reactions, and moderation results.

Method	Information
onTextMessageReceived(message: CometChat.TextMessage)	This event is triggered when a Text Message is received.
onMediaMessageReceived(message: CometChat.MediaMessage)	This event is triggered when a Media Message is received.
onCustomMessageReceived(message: CometChat.CustomMessage)	This event is triggered when a Custom Message is received.
onTypingStarted(typingIndicator: CometChat.TypingIndicator)	This event is triggered when a user starts typing in a user/group conversation
onTypingEnded(typingIndicator: CometChat.TypingIndicator)	This event is triggered when a user stops typing in a user/group conversation.
onMessagesDelivered(messageReceipt: CometChat.MessageReceipt)	This event is triggered when a set of messages are marked as delivered for any particular conversation.
onMessagesRead(messageReceipt: CometChat.MessageReceipt)	This event is triggered when a set of messages are marked as read for any particular conversation.
onMessageEdited(message: CometChat.BaseMessage)	This method is triggered when a particular message has been edited in a user/group conversation.
onMessageDeleted(message: CometChat.BaseMessage)	This event is triggered when a particular message is deleted in a user/group conversation.
onTransientMessageReceived(receipt: CometChat.TransientMessage)	This event is triggered when a Transient Message is received.
onMessageReactionAdded(receipt: CometChat.ReactionEvent)	This event is triggered when a reaction is added to a message in a user/group conversation.
onMessageReactionRemoved(receipt: CometChat.ReactionEvent)	This event is triggered when a reaction is remove from a message in a user/group conversation.
onMessageModerated(message: CometChat.BaseMessage)	This event is triggered when a message sent by the logged-in user is successfully processed by moderation and receives either an `approved` or `disapproved` status.
onMessagesDeliveredToAll(receipt: CometChat.MessageReceipt)	This event is triggered when a group message is delivered to all members. Group conversations only.
onMessagesReadByAll(receipt: CometChat.MessageReceipt)	This event is triggered when a group message is read by all members. Group conversations only.
onAIAssistantMessageReceived(message: CometChat.AIAssistantMessage)	This event is triggered when a persisted AI assistant reply is received after an agent run completes.
onAIToolResultReceived(message: CometChat.AIToolResultMessage)	This event is triggered when a persisted AI tool result message is received after an agent run completes.
onAIToolArgumentsReceived(message: CometChat.AIToolArgumentMessage)	This event is triggered when a persisted AI tool argument message is received after an agent run completes.
To add the `MessageListener`, you need to use the `addMessageListener()` method provided by the `CometChat` class.

TypeScript
JavaScript

CometChat.addMessageListener(
  "UNIQUE_LISTENER_ID",
  new CometChat.MessageListener({
    onTextMessageReceived: (textMessage: CometChat.TextMessage) => {
      console.log("Text message received successfully", textMessage);
    },
    onMediaMessageReceived: (mediaMessage: CometChat.MediaMessage) => {
      console.log("Media message received successfully", mediaMessage);
    },
    onCustomMessageReceived: (customMessage: CometChat.CustomMessage) => {
      console.log("Custom message received successfully", customMessage);
    },
    onMessagesDelivered: (messageReceipt: CometChat.MessageReceipt) => {
      console.log("Message Delivered", messageReceipt);
    },
    onMessagesRead: (messageReceipt: CometChat.MessageReceipt) => {
      console.log("Message Read", messageReceipt);
    },
    onTypingStarted: (typingIndicator: CometChat.TypingIndicator) => {
      console.log("Typing Started", typingIndicator);
    },
    onTypingEnded: (typingIndicator: CometChat.TypingIndicator) => {
      console.log("Typing Ended", typingIndicator);
    },
    onMessageDeleted: (message: CometChat.BaseMessage) => {
      console.log("Message Delted", message);
    },
    onMessageEdited: (message: CometChat.BaseMessage) => {
      console.log("Message Edited", message);
    },
    onTransientMessageReceived: (message: CometChat.TransientMessage) => {
      console.log("Transient Message received", message);
    },
    onMessageReactionAdded: (reaction: CometChat.ReactionEvent) => {
      console.log("Message Reaction added", reaction);
    },
    onMessageReactionRemoved: (reaction: CometChat.ReactionEvent) => {
      console.log("Message Reaction removed", reaction);
    },
    onMessageModerated: (message: CometChat.BaseMessage) => {
      console.log("Message Moderated", message);
    },
    onMessagesDeliveredToAll: (messageReceipt: CometChat.MessageReceipt) => {
      console.log("Message Delivered to All", messageReceipt);
    },
    onMessagesReadByAll: (messageReceipt: CometChat.MessageReceipt) => {
      console.log("Message Read by All", messageReceipt);
    },
    onAIAssistantMessageReceived: (message: CometChat.AIAssistantMessage) => {
      console.log("AI Assistant message received", message);
    },
    onAIToolResultReceived: (message: CometChat.AIToolResultMessage) => {
      console.log("AI Tool result received", message);
    },
    onAIToolArgumentsReceived: (message: CometChat.AIToolArgumentMessage) => {
      console.log("AI Tool arguments received", message);
    },
  })
);

CometChat.addMessageListener(
  "UNIQUE_LISTENER_ID",
  new CometChat.MessageListener({
    onTextMessageReceived: (textMessage) => {
      console.log("Text message received successfully", textMessage);
    },
    onMediaMessageReceived: (mediaMessage) => {
      console.log("Media message received successfully", mediaMessage);
    },
    onCustomMessageReceived: (customMessage) => {
      console.log("Custom message received successfully", customMessage);
    },
    onMessagesDelivered: (messageReceipt) => {
      console.log("Message Delivered", messageReceipt);
    },
    onMessagesRead: (messageReceipt) => {
      console.log("Message Read", messageReceipt);
    },
    onTypingStarted: (typingIndicator) => {
      console.log("Typing Started", typingIndicator);
    },
    onTypingEnded: (typingIndicator) => {
      console.log("Typing Ended", typingIndicator);
    },
    onMessageDeleted: (message) => {
      console.log("Message Deleted", message);
    },
    onMessageEdited: (message) => {
      console.log("Message Edited", message);
    },
    onTransientMessageReceived: (message) => {
      console.log("Transient Message received", message);
    },
    onMessageReactionAdded: (reaction) => {
      console.log("Message Reaction added", reaction);
    },
    onMessageReactionRemoved: (reaction) => {
      console.log("Message Reaction removed", reaction);
    },
    onMessageModerated: (message) => {
      console.log("Message Moderated", message);
    },
    onMessagesDeliveredToAll: (messageReceipt) => {
      console.log("Message Delivered to All", messageReceipt);
    },
    onMessagesReadByAll: (messageReceipt) => {
      console.log("Message Read by All", messageReceipt);
    },
    onAIAssistantMessageReceived: (message) => {
      console.log("AI Assistant message received", message);
    },
    onAIToolResultReceived: (message) => {
      console.log("AI Tool result received", message);
    },
    onAIToolArgumentsReceived: (message) => {
      console.log("AI Tool arguments received", message);
    },
  })
);

Remove the listener when no longer needed:

TypeScript
JavaScript

let listenerID: string = "UNIQUE_LISTENER_ID";
CometChat.removeMessageListener(listenerID);

let listenerID = "UNIQUE_LISTENER_ID";
CometChat.removeMessageListener(listenerID);

Call Listener

Receive events for incoming and outgoing call state changes.

Method	Information
onIncomingCallReceived(call: CometChat.Call)	This event is triggered when the logged-in user receives an incoming call. The details of the call can be obtained from the Call object received as the method parameter.
onOutgoingCallAccepted(call: CometChat.Call)	This event is triggered when the call initiated by the logged-in user is accepted by the recipient. The details of the call can be obtained from the Call object received as the method parameter.
onOutgoingCallRejected(call: CometChat.Call)	This event is triggered when the call initiated by the logged-in user is rejected by the recipient. The details of the call can be obtained from the Call object received as the method parameter
onIncomingCallCancelled(call: CometChat.Call)	This event is triggered when an incoming call is canceled by the initiator of the call. The details of the call can be obtained from the Call object received as the method parameter
onCallEndedMessageReceived(call: CometChat.Call)	This event is triggered when a call ends. The call object contains the final status and duration.

To add the CallListener:

TypeScript
JavaScript

CometChat.addCallListener(
  "UNIQUE_LISTENER_ID",
  new CometChat.CallListener({
    onIncomingCallReceived: (call: CometChat.Call) => {
      console.log("Incoming call:", call);
    },
    onOutgoingCallAccepted: (call: CometChat.Call) => {
      console.log("Outgoing call accepted:", call);
    },
    onOutgoingCallRejected: (call: CometChat.Call) => {
      console.log("Outgoing call rejected:", call);
    },
    onIncomingCallCancelled: (call: CometChat.Call) => {
      console.log("Incoming call canceled:", call);
    },
    onCallEndedMessageReceived: (call: CometChat.Call) => {
      console.log("Call ended message:", call);
    },
  })
);

CometChat.addCallListener(
  "UNIQUE_LISTENER_ID",
  new CometChat.CallListener({
    onIncomingCallReceived(call) {
      console.log("Incoming call:", call);
    },
    onOutgoingCallAccepted(call) {
      console.log("Outgoing call accepted:", call);
    },
    onOutgoingCallRejected(call) {
      console.log("Outgoing call rejected:", call);
    },
    onIncomingCallCancelled(call) {
      console.log("Incoming call canceled:", call);
    },
    onCallEndedMessageReceived(call) {
      console.log("Call ended message:", call);
    },
  })
);

Remove the listener when no longer needed:

TypeScript
JavaScript

let listenerID: string = "UNIQUE_LISTENER_ID";
CometChat.removeCallListener(listenerID);

let listenerID = "UNIQUE_LISTENER_ID";
CometChat.removeCallListener(listenerID);

AI Assistant Listener

The AIAssistantListener provides real-time streaming events from AI Agent runs. These events are received as the agent processes a user’s message, before the final persisted messages arrive via the MessageListener.

Method	Information
onAIAssistantEventReceived(event: CometChat.AIAssistantBaseEvent)	This event is triggered for each streaming event during an AI Agent run (run start, tool calls, text message streaming, run finished). See `AIAssistantBaseEvent` for the event structure.

TypeScript
JavaScript

const listenerID: string = "UNIQUE_LISTENER_ID";
CometChat.addAIAssistantListener(
  listenerID,
  new CometChat.AIAssistantListener({
    onAIAssistantEventReceived: (event: CometChat.AIAssistantBaseEvent) => {
      console.log("AI Assistant event:", event.getType(), event);
    },
  })
);

const listenerID = "UNIQUE_LISTENER_ID";
CometChat.addAIAssistantListener(
  listenerID,
  new CometChat.AIAssistantListener({
    onAIAssistantEventReceived: (event) => {
      console.log("AI Assistant event:", event.getType(), event);
    },
  })
);

To remove the listener:

TypeScript
JavaScript

CometChat.removeAIAssistantListener("UNIQUE_LISTENER_ID");

CometChat.removeAIAssistantListener("UNIQUE_LISTENER_ID");

Ongoing Call Listener (Calls SDK)

The OngoingCallListener provides real-time callbacks for active call session events. It is part of the CometChat Calls SDK (not the Chat SDK) and is used with CallSettingsBuilder.setCallListener() or CometChatCalls.addCallEventListener(). All three calling flows — Call Session, Standalone Calling, and Ringing — use the same OngoingCallListener.

Callbacks

Callback	Parameter	Description
`onUserJoined(user)`	`user` object	A remote participant joined the call
`onUserLeft(user)`	`user` object	A remote participant left the call
`onUserListUpdated(userList)`	Array of `user` objects	The participant list changed (join or leave)
`onCallEnded()`	—	The call session terminated (1:1 calls only, fires for both participants)
`onCallEndButtonPressed()`	—	The local user clicked the end call button
`onSessionTimeout()`	—	The call was auto-terminated due to inactivity. v4.1.0+
`onScreenShareStarted()`	—	The local user started sharing their screen
`onScreenShareStopped()`	—	The local user stopped sharing their screen
`onUserMuted(event)`	`event` object	A participant’s mute state changed
`onCallSwitchedToVideo(event)`	`event` object	An audio call was upgraded to video
`onMediaDeviceListUpdated(deviceList)`	`deviceList` object	Available audio/video devices changed
`onRecordingStarted(event)`	`event` object	A user started recording the call
`onRecordingStopped()`	—	Recording was stopped
`onError(error)`	`CometChatCallsException`	An error occurred during the call session

Callback Parameter Shapes

user object (received by onUserJoined, onUserLeft):

Property	Type	Description
`name`	`string`	Display name of the user
`avatar`	`string`	URL of the user’s avatar
`uid`	`string`	UID of the user

onUserListUpdated(userList) — receives an array of user objects with the same shape as above. onUserMuted(event):

Property	Type	Description
`event.muted.name`	`string`	Name of the muted user
`event.muted.uid`	`string`	UID of the muted user
`event.muted.isAudioMuted`	`boolean`	Whether audio is muted
`event.muted.isVideoMuted`	`boolean`	Whether video is muted
`event.mutedBy.name`	`string`	Name of the user who muted
`event.mutedBy.uid`	`string`	UID of the user who muted

onCallSwitchedToVideo(event):

Property	Type	Description
`event.sessionId`	`string`	Session ID of the call
`event.initiator.name`	`string`	Name of the user who initiated the switch
`event.initiator.uid`	`string`	UID of the initiator
`event.responder.name`	`string`	Name of the responder
`event.responder.uid`	`string`	UID of the responder

onMediaDeviceListUpdated(deviceList):

Property	Type	Description
`deviceList.videoInputDevices`	`MediaDeviceInfo[]`	Available cameras
`deviceList.audioInputDevices`	`MediaDeviceInfo[]`	Available microphones
`deviceList.audioOutputDevices`	`MediaDeviceInfo[]`	Available speakers/headphones

onRecordingStarted(event):

Property	Type	Description
`event.user.name`	`string`	Name of the user who started recording
`event.user.uid`	`string`	UID of the user who started recording

onRecordingStopped(), onCallEnded(), onSessionTimeout(), onCallEndButtonPressed(), onScreenShareStarted(), onScreenShareStopped() — receive no arguments.

TypeScript
JavaScript

const listenerId: string = "UNIQUE_LISTENER_ID";

CometChatCalls.addCallEventListener(listenerId, {
  onUserJoined: (user: any) => {
    console.log("User joined:", user);
  },
  onUserLeft: (user: any) => {
    console.log("User left:", user);
  },
  onCallEnded: () => {
    console.log("Call ended");
  },
  onCallEndButtonPressed: () => {
    console.log("End call button pressed");
  },
  onError: (error: any) => {
    console.log("Call error:", error);
  },
});

// Remove listener when done
CometChatCalls.removeCallEventListener(listenerId);

const listenerId = "UNIQUE_LISTENER_ID";

CometChatCalls.addCallEventListener(listenerId, {
  onUserJoined: (user) => {
    console.log("User joined:", user);
  },
  onUserLeft: (user) => {
    console.log("User left:", user);
  },
  onCallEnded: () => {
    console.log("Call ended");
  },
  onCallEndButtonPressed: () => {
    console.log("End call button pressed");
  },
  onError: (error) => {
    console.log("Call error:", error);
  },
});

// Remove listener when done
CometChatCalls.removeCallEventListener(listenerId);

Receive events when the user’s authentication state changes — login success/failure and logout success/failure.

Method	Description
`loginSuccess(user)`	User logged in successfully. Provides the `User` object.
`loginFailure(error)`	Login failed. Provides a `CometChatException`.
`logoutSuccess()`	User logged out successfully.
`logoutFailure(error)`	Logout failed. Provides a `CometChatException`.

TypeScript
JavaScript

const listenerID: string = "UNIQUE_LISTENER_ID";
CometChat.addLoginListener(
  listenerID,
  new CometChat.LoginListener({
    loginSuccess: (user: CometChat.User) => {
      console.log("LoginListener :: loginSuccess", user);
    },
    loginFailure: (error: CometChat.CometChatException) => {
      console.log("LoginListener :: loginFailure", error);
    },
    logoutSuccess: () => {
      console.log("LoginListener :: logoutSuccess");
    },
    logoutFailure: (error: CometChat.CometChatException) => {
      console.log("LoginListener :: logoutFailure", error);
    }
  })
);

const listenerID = "UNIQUE_LISTENER_ID";
CometChat.addLoginListener(
  listenerID,
  new CometChat.LoginListener({
    loginSuccess: (user) => {
      console.log("LoginListener :: loginSuccess", user);
    },
    loginFailure: (error) => {
      console.log("LoginListener :: loginFailure", error);
    },
    logoutSuccess: () => {
      console.log("LoginListener :: logoutSuccess");
    },
    logoutFailure: (error) => {
      console.log("LoginListener :: logoutFailure", error);
    }
  })
);

Remove the listener when no longer needed:

CometChat.removeLoginListener("UNIQUE_LISTENER_ID");

Connection Listener

Receive events when the WebSocket connection state changes.

Method	Description
`onConnected()`	SDK has an active connection to CometChat servers.
`inConnecting()`	SDK is attempting to establish or re-establish a connection.
`onDisconnected()`	SDK is disconnected due to network issues or other errors.
`onFeatureThrottled()`	A feature has been throttled due to rate limiting.

TypeScript
JavaScript

const listenerID: string = "UNIQUE_LISTENER_ID";
CometChat.addConnectionListener(
  listenerID,
  new CometChat.ConnectionListener({
    onConnected: () => {
      console.log("ConnectionListener :: connected");
    },
    inConnecting: () => {
      console.log("ConnectionListener :: connecting");
    },
    onDisconnected: () => {
      console.log("ConnectionListener :: disconnected");
    },
    onFeatureThrottled: () => {
      console.log("ConnectionListener :: feature throttled");
    }
  })
);

const listenerID = "UNIQUE_LISTENER_ID";
CometChat.addConnectionListener(
  listenerID,
  new CometChat.ConnectionListener({
    onConnected: () => {
      console.log("ConnectionListener :: connected");
    },
    inConnecting: () => {
      console.log("ConnectionListener :: connecting");
    },
    onDisconnected: () => {
      console.log("ConnectionListener :: disconnected");
    },
    onFeatureThrottled: () => {
      console.log("ConnectionListener :: feature throttled");
    }
  })
);

Remove the listener when no longer needed:

CometChat.removeConnectionListener("UNIQUE_LISTENER_ID");

Next Steps

Receive Messages

Handle incoming messages in real-time

Typing Indicators

Show when users are typing

User Presence

Track online/offline status of users

Connection Status

Monitor SDK connection state changes

​User Listener

​Group Listener

​Message Listener

​Call Listener

​AI Assistant Listener

​Ongoing Call Listener (Calls SDK)

​Callbacks

​Callback Parameter Shapes

​Login Listener

​Connection Listener

​Next Steps

Receive Messages

Typing Indicators

User Presence

Connection Status

User Listener

Group Listener

Message Listener

Call Listener

AI Assistant Listener

Ongoing Call Listener (Calls SDK)

Callbacks

Callback Parameter Shapes

Login Listener

Connection Listener

Next Steps