Join a Group

Join a Group

In order to start participating in group conversations, you will have to join a group. You can do so using the joinGroup() method.

Join Group

var GUID = "GUID";
var password = "";
var groupType = CometChat.GROUP_TYPE.PUBLIC;

CometChat.joinGroup(GUID, groupType, password).then(
group => {
  console.log("Group joined successfully:", group);
}, error => {
  console.log("Group joining failed with exception:", error);
}
);

Typescript

var GUID: string = "GUID";

CometChat.joinGroup(GUID, CometChat.GroupType.Public).then(
  (group: CometChat.Group) => {
      console.log("Group joined successfully:", group);
  }, (error: CometChat.CometChatException) => {
      console.log("Group joining failed with exception:", error);
  }
);  

The joinGroup() method takes the below parameters

Parameter	Description
GUID	The GUID of the group you would like to join.
groupType	Type of the group. CometChat provides 3 types of groups viz. a. CometChatConstants.GROUP_TYPE_PUBLIC (public) b. CometChatConstants.GROUP_TYPE___PASSWORD (password) c. CometChatConstants.GROUP_TYPE_PRIVATE (private)
password	Password is mandatory in case of a password protected group.

Once you have joined a group successfully, you can send and receive messages in that group.

CometChat keeps a track of the groups joined and you do not need to join the group every time you want to communicate in the group.

You can identify if a group is joined using the hasJoined parameter in the Group object.

Real-time Group Member Joined Events

In other words, as a member of a group, how do I know if someone joins the group when my app is running?

If a user joins any group, the members of the group receive a real-time event in the onGroupMemberJoined() method of the GroupListener class.

Group Listener

CometChat.addGroupListener(
  "UNIQUE_LISTNER_ID",
  new CometChat.GroupListener({
      onGroupMemberJoined: (message, joinedUser, joinedGroup) => {
          console.log("User joined", { message, joinedUser, joinedGroup });
      }
  })
);

Typescript

CometChat.addGroupListener(
  "UNIQUE_LISTNER_ID",
  new CometChat.GroupListener({
      onGroupMemberJoined: (message: CometChat.Action, joinedUser: CometChat.User, joinedGroup: CometChat.Group) => {
          console.log("User joined", { message, joinedUser, joinedGroup });
      }
  })
);

Missed Group Member Joined Events

In other words, as a member of a group, how do I know if someone joins the group when my app is not running?

When you retrieve the list of previous messages if a member has joined any group that the logged-in user is a member of, the list of messages will contain an Action message. An Action message is a sub-class of BaseMessage class.

For the group member joined event, in the Action object received, the following fields can help you get the relevant information-

1. action - joined
2. actionBy - User object containing the details of the user who joined the group
3. actionFor- Group object containing the details of the group the user has joined