You can integrate the CometChat Chat Builder widget into any static HTML website by embedding a few lines of code directly into your HTML files. Once installed, it will:
  • Load and initialize the widget on page load
  • Automatically log in a predefined user
  • Display a docked chat window on your website

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Quick Steps to Embed CometChat Widget

1

Register on CometChat & Gather Your Keys

Before you begin, sign up at the CometChat Dashboard and create a new app. Copy:
  • App ID
  • Region
  • Auth Key
2

Include the Chat-Embed Script in `<head>`

Add this inside the <head> section of your HTML file to load the CometChat bundle:
<script defer src="https://cdn.jsdelivr.net/npm/@cometchat/chat-embed@latest/dist/main.js"></script>
3

Embed & Initialize the Widget in `<body>`

Paste the following just before the closing </body> tag:
<div id="cometChatMount"></div>

<script>
  const COMETCHAT_CREDENTIALS = {
    appID:     "<YOUR_APP_ID>",
    appRegion: "<YOUR_APP_REGION>",
    authKey:   "<YOUR_AUTH_KEY>",
  };

  const COMETCHAT_USER_UID = "UID"; // Replace with your actual user UID

  const COMETCHAT_LAUNCH_OPTIONS = {
    targetElementID: "cometChatMount",   // Element ID to mount the widget
    isDocked:        true,               // true = floating bubble, false = embedded
    width:           "700px",            // Widget width
    height:          "500px",            // Widget height

    // Optional advanced settings:
    // variantID:        "YOUR_VARIANT_ID",    // Variant configuration ID
    // chatType:         "user",               // "user" or "group"
    // defaultChatID:    "uid_or_guid",        // UID or GUID to open chat by default
    // dockedAlignment:  "right",              // For docked mode: "left" or "right"
  };

  window.addEventListener("DOMContentLoaded", () => {
    CometChatApp.init(COMETCHAT_CREDENTIALS)
      .then(() => {
        console.log("[CometChat] Initialized successfully");
        return CometChatApp.login({ uid: COMETCHAT_USER_UID });
      })
      .then(user => {
        console.log("[CometChat] Logged in as:", user);
        return CometChatApp.launch(COMETCHAT_LAUNCH_OPTIONS);
      })
      .then(() => {
        console.log("[CometChat] Chat launched!");
      })
      .catch(error => {
        console.error("[CometChat] Error:", error);
      });
  });
</script>
Replace <YOUR_APP_ID>, <YOUR_APP_REGION>, <YOUR_AUTH_KEY>, and COMETCHAT_USER_UID with your actual credentials and user ID.
4

Troubleshooting

  • Widget not loading? Check the browser console for errors and verify your App ID, Region & Auth Key.
  • User login fails? Ensure the COMETCHAT_USER_UID exists under Users in your CometChat Dashboard.
  • Script blocked? Confirm you’re using the correct <script> URL and that no CSP or ad-blockers are preventing it.

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Advanced JavaScript APIs

Once the widget is loaded, interact with it via the global CometChatApp object:

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Chat and Call Methods

// Chat with a particular user
CometChatApp.chatWithUser("UID");

// Chat with a particular group
CometChatApp.chatWithGroup("GUID");

// Initiate calls with a particular user
CometChatApp.callUser("UID");

// Initiate calls with a particular group
CometChatApp.callGroup("GUID");

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UI Event Listeners

// Message received listener
CometChatApp.uiEvent("onMessageReceived", (msg) => {
  console.log("New message received:", msg);
});

// Chat opened listener (for docked mode)
CometChatApp.uiEvent("onOpenChat", (args) => {
  console.log("Chat opened", args);
});

// Chat closed listener (for docked mode)
CometChatApp.uiEvent("onCloseChat", (args) => {
  console.log("Chat closed", args);
});

// Active chat change listener
CometChatApp.uiEvent("onActiveChatChanged", (args) => {
  console.log("onActiveChatChanged", args);
});

​
User and Group Management

// Create or update a user on-the-fly
const user = new CometChatApp.CometChat.User("UID");
user.setName("User Name");
user.setAvatar("https://example.com/uid.png");
user.setLink("https://example.com/profile/uid");

CometChatApp.createOrUpdateUser(user).then((createdUser) => {
  console.log("User created/updated", createdUser);
});

// Create or update a group on-the-fly
const group = new CometChatApp.CometChat.Group("GUID", "GROUP_NAME", "public");
CometChatApp.createOrUpdateGroup(group).then((createdGroup) => {
  console.log("Group created/updated", createdGroup);
});

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Authentication Methods

// Login with authToken
CometChatApp.login({ authToken: "your-auth-token" }); // More secure

// Login with UID
CometChatApp.login({ uid: "your-uid" });  // Less secure

// User logout
CometChatApp.logout();

// Logout listener
CometChatApp.uiEvent("onLogout", (args) => {
  console.log("onLogout", args);
});

​
Localization

With language localization, our Chat Widget adapts to the language of a specific country or region. Chat Widget allows you to detect the language of your users based on their browser settings and set the language of the widget accordingly. You can also set the language manually using the CometChatApp.localize method. The CometChat App supports localization for multiple languages, allowing you to provide a tailored experience for users across different regions. You can find the list of supported languages and their corresponding language codes below:
LanguageCode
English (United States)en-US
English (United Kingdom)en-GB
Dutchnl
Frenchfr
Germande
Hindihi
Italianit
Japaneseja
Koreanko
Portuguesept
Russianru
Spanishes
Turkishtr
Chinesezh
Chinese (Traditional)zh-TW
Malayms
Swedishsv
Lithuanianlt
Hungarianhu
CometChatApp.localize(LANGUAGE_CODE);

Eg. CometChatApp.localize('en-US');
It takes the following parameters:
ParameterDescriptionType
LANGUAGE_CODEThe language code the texts to be translated intoRequired

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Need Help?

If you have questions or run into issues, reach out to CometChat Support.