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FieldValue
Package@cometchat/chat-uikit-react
FrameworkReact.js
ComponentsCometChatConversations, CometChatCallLogs, CometChatUsers, CometChatMessageHeader, CometChatMessageList, CometChatMessageComposer
LayoutTabbed sidebar (Chat, Calls, Users) + message view
PrerequisiteComplete React.js Integration first
PatternFull-featured messaging app with multiple sections
This guide builds a tabbed messaging UI — Chat, Calls, and Users tabs in the sidebar, with a message view on the right. Good for full-featured apps that need more than just conversations. This assumes you’ve already completed React.js Integration (project created, UI Kit installed, init + login working).

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What You’re Building

Three sections working together:
  1. Tab bar — switches between Chat, Calls, and Users
  2. Sidebar — renders the list for the active tab
  3. Message view — header + messages + composer for the selected item

​
Full Code

Replace your src/App.tsx with the following. This assumes init() and login() already happen in src/main.tsx (as shown in the integration guide).
src/App.tsx
import { useState } from "react";
import { CometChat } from "@cometchat/chat-sdk-javascript";
import {
  CometChatProvider,
  CometChatConversations,
  CometChatUsers,
  CometChatCallLogs,
  CometChatMessageHeader,
  CometChatMessageList,
  CometChatMessageComposer,
} from "@cometchat/chat-uikit-react";
import "@cometchat/chat-uikit-react/styles";
import "./App.css";

type Tab = "chat" | "calls" | "users";

function App() {
  const [activeTab, setActiveTab] = useState<Tab>("chat");
  const [selectedUser, setSelectedUser] = useState<CometChat.User | undefined>(undefined);
  const [selectedGroup, setSelectedGroup] = useState<CometChat.Group | undefined>(undefined);

  const handleConversationClick = (conversation: CometChat.Conversation) => {
    const entity = conversation.getConversationWith();
    if (conversation.getConversationType() === "user") {
      setSelectedUser(entity as CometChat.User);
      setSelectedGroup(undefined);
    } else {
      setSelectedGroup(entity as CometChat.Group);
      setSelectedUser(undefined);
    }
  };

  const handleUserClick = (user: CometChat.User) => {
    setSelectedUser(user);
    setSelectedGroup(undefined);
  };

  const handleCallClick = (call: any) => {
    const initiator = call.getInitiator();
    const receiver = call.getReceiver();
    const loggedInUser = CometChat.getLoggedinUser
      ? undefined
      : undefined;

    // Determine the other party in the call
    if (receiver instanceof CometChat.User) {
      setSelectedUser(receiver);
      setSelectedGroup(undefined);
    } else if (receiver instanceof CometChat.Group) {
      setSelectedUser(undefined);
      setSelectedGroup(receiver);
    } else if (initiator instanceof CometChat.User) {
      setSelectedUser(initiator);
      setSelectedGroup(undefined);
    }
  };

  return (
    <CometChatProvider>
      <div className="tabbed-chat">
        <div className="sidebar">
          <div className="tab-bar">
            <button
              className={`tab-button ${activeTab === "chat" ? "tab-button--active" : ""}`}
              onClick={() => setActiveTab("chat")}
            >
              Chats
            </button>
            <button
              className={`tab-button ${activeTab === "calls" ? "tab-button--active" : ""}`}
              onClick={() => setActiveTab("calls")}
            >
              Calls
            </button>
            <button
              className={`tab-button ${activeTab === "users" ? "tab-button--active" : ""}`}
              onClick={() => setActiveTab("users")}
            >
              Users
            </button>
          </div>

          <div className="sidebar-list">
            {activeTab === "chat" && (
              <CometChatConversations onItemClick={handleConversationClick} />
            )}
            {activeTab === "calls" && (
              <CometChatCallLogs onItemClick={handleCallClick} />
            )}
            {activeTab === "users" && (
              <CometChatUsers onItemClick={handleUserClick} />
            )}
          </div>
        </div>

        {selectedUser || selectedGroup ? (
          <div className="messages-wrapper">
            <CometChatMessageHeader user={selectedUser} group={selectedGroup} />
            <CometChatMessageList user={selectedUser} group={selectedGroup} />
            <CometChatMessageComposer user={selectedUser} group={selectedGroup} />
          </div>
        ) : (
          <div className="empty-conversation">
            Select a conversation to start chatting
          </div>
        )}
      </div>
    </CometChatProvider>
  );
}

export default App;
src/App.css
.tabbed-chat {
  display: flex;
  height: 100vh;
  width: 100%;
}

.sidebar {
  width: 360px;
  height: 100%;
  display: flex;
  flex-direction: column;
  border-right: 1px solid #eee;
}

.tab-bar {
  display: flex;
  border-bottom: 1px solid #eee;
  background: var(--cometchat-background-color-01, #fff);
}

.tab-button {
  flex: 1;
  padding: 12px 0;
  border: none;
  background: none;
  cursor: pointer;
  font: var(--cometchat-font-body-medium, 500 14px Roboto);
  color: var(--cometchat-text-color-secondary, #727272);
  border-bottom: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}

.tab-button:hover {
  color: var(--cometchat-text-color-primary, #141414);
}

.tab-button--active {
  color: var(--cometchat-text-color-highlight, #6851d6);
  border-bottom-color: var(--cometchat-primary-color, #6851d6);
}

.sidebar-list {
  flex: 1;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.messages-wrapper {
  flex: 1;
  height: 100%;
  display: flex;
  flex-direction: column;
}

.empty-conversation {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
  background: var(--cometchat-background-color-03, #f5f5f5);
  color: var(--cometchat-text-color-secondary, #727272);
  font: var(--cometchat-font-body-regular, 400 14px Roboto);
}

​
How It Works

  1. Tab state — activeTab controls which list component renders in the sidebar.
  2. Conditional rendering — only the active tab’s component mounts. Switching tabs unmounts the previous list and mounts the new one.
  3. Unified selection — all three tabs feed into the same selectedUser / selectedGroup state. Clicking any item (conversation, call log, or user) updates the message panel.
  4. Call log handling — when a call log is clicked, the receiver (user or group) is extracted and passed to the message components.

​
Adding More Tabs

To add a Groups tab, import CometChatGroups and add another tab button + conditional render: 
import { CometChatGroups } from "@cometchat/chat-uikit-react";

// Add to Tab type:
type Tab = "chat" | "calls" | "users" | "groups";

// Add button in tab-bar:
<button
  className={`tab-button ${activeTab === "groups" ? "tab-button--active" : ""}`}
  onClick={() => setActiveTab("groups")}
>
  Groups
</button>

// Add in sidebar-list:
{activeTab === "groups" && (
  <CometChatGroups
    onItemClick={(group: CometChat.Group) => {
      setSelectedGroup(group);
      setSelectedUser(undefined);
    }}
  />
)}
You can follow the same pattern for any additional tabs (Settings, Contacts, etc.).

​
Run

npm run dev
Open http://localhost:5173. You should see the tab bar at the top of the sidebar. Switch between Chats, Calls, and Users — clicking any item loads the message view on the right.

​
Next Steps

Conversation List + Messages

Two-panel layout without tabs

Components Overview

Browse all prebuilt UI components

Theming

Customize colors, fonts, and styles