Svelte

To make the most of this guide, you will need:

• A TalkJS account
• A Svelte app to which you'd like to add TalkJS chat

To get started, install @talkjs/web-components:

1npm install @talkjs/web-components

To view an existing sample conversation, import the components and theme into your app:

1<script lang="ts">
2  import '@talkjs/web-components';
3  import '@talkjs/web-components/default.css';
4</script>

Next, add the t-chatbox web component and styling:

1<script lang="ts">
2  import '@talkjs/web-components';
3  import '@talkjs/web-components/default.css';
4
5  const appId = '<APP_ID>';
6</script>
7
8<main>
9  <div class="wrapper">
10    <t-chatbox
11      app-id={appId}
12      user-id="sample_user_alice"
13      conversation-id="sample_conversation"
14    ></t-chatbox>
15  </div>
16</main>
17
18<style>
19  .wrapper {
20    width: 400px;
21    height: 600px;
22  }
23</style>

The t-chatbox component has the following attributes:

• appId: Your TalkJS app ID. You can find your app ID on the Settings page of your TalkJS dashboard. For this guide, use the app ID for your test mode, which has built-in sample users and conversations.

• userId: An identifier for the current user to send messages as. This example uses the ID of an existing sample user, sample_user_alice.
• conversationId: An identifier of the conversation that you want to view. This example uses the ID for a built-in sample conversation, sample_conversation.

Run your app. You should get something like the following:

You now have a fully-featured chat window running in your app. Try sending a message!

To view the conversation as a different user, change the userId. For example, try switching the userId to sample_user_sebastian to view the other side of the sample conversation.

If the chat window doesn't show up, make sure that you've entered your app ID correctly.

So far in this guide we've used a sample user and conversation. Next, we'll create new users and a conversation between them, and sync them with the TalkJS servers. To do this, we'll use the JavaScript Data API.

Install the @talkjs/core package:

1npm install @talkjs/core

Then import getTalkSession from the package into your component:

1<script setup>
2  import '@talkjs/web-components';
3  import '@talkjs/web-components/default.css';
4  import { getTalkSession } from '@talkjs/core';
5</script>

Add the following code to the script section of your component:

1const userId = 'frank';
2const otherUserId = 'nina';
3const conversationId = 'my_conversation';
4
5const session = getTalkSession({ appId, userId });
6session.currentUser.createIfNotExists({ name: 'Frank' });
7session.user(otherUserId).createIfNotExists({ name: 'Nina' });
8const conversation = session.conversation(conversationId);
9conversation.createIfNotExists();
10conversation.participant(otherUserId).createIfNotExists();

Update the t-chatbox component in your template to use the new variables:

1<t-chatbox
2  app-id={appId}
3  user-id={userId}
4  conversation-id={conversationId}
5></t-chatbox>

This code creates a new TalkJS session, which provides access to a continuous, up-to-date flow of your TalkJS data. It then creates two new users and a conversation between them.

Here's the code so far, so that you can see how it all fits together:

1<script lang="ts">
2  import '@talkjs/web-components';
3  import '@talkjs/web-components/default.css';
4  import { getTalkSession } from '@talkjs/core';
5
6  // Define the TalkJS configuration
7  const appId = '<APP_ID>';
8  const userId = 'frank';
9  const otherUserId = 'nina';
10  const conversationId = 'my_conversation';
11
12  const session = getTalkSession({ appId, userId });
13  session.currentUser.createIfNotExists({ name: 'Frank' });
14  session.user(otherUserId).createIfNotExists({ name: 'Nina' });
15  const conversation = session.conversation(conversationId);
16  conversation.createIfNotExists();
17  conversation.participant(otherUserId).createIfNotExists();
18</script>
19
20<main>
21  <div class="wrapper">
22    <t-chatbox
23      app-id={appId}
24      user-id={userId}
25      conversation-id={conversationId}
26    ></t-chatbox>
27  </div>
28</main>
29
30<style>
31  .wrapper {
32    width: 400px;
33    height: 600px;
34  }
35</style>

With a custom theme, you can change any aspect of your chat to match your own style, giving you full control over the look and feel of your chat UI.

First, adjust your CSS import like so:

1- import '@talkjs/web-components/default.css';
2+ import '@talkjs/web-components/base.css';

Download the theme files from our open source theme-default GitHub repo. Then, extract the files and add them to your own source code. Update your imports to point at the downloaded files:

1<script lang="ts">
2  import '@talkjs/web-components';
3  import '@talkjs/web-components/base.css';
4  import { getTalkSession } from '@talkjs/core';
5
6  // Use the path to the files you copied
7  import * as customTheme from './customTheme';
8  import './customTheme/index.css';
9</script>

Pass the custom theme to the chatbox:

1<t-chatbox
2  app-id={appId}
3  user-id={userId}
4  conversation-id={conversationId}
5  theme={customTheme}
6></t-chatbox>

You can now customize any aspect of your theme by editing the CSS and JavaScript files of the individual components in the custom-theme folder directly.

For styling changes, edit the CSS files. For example, to give message field a different background color, you can edit the custom-theme/components/MessageField.css file. If you change background-color: #ececec to background-color: lightblue, then the message field gets a light blue background color:

For behavior changes, edit the JavaScript files. For example, to add a new message action, add the following to the MessageActionMenu.js file:

1return html`
2  <div className="t-theme-message-action-menu">
3    ${permissions.canReply &&
4    html`<button t-action="reply" onClick=${() => setReferencedMessage(message.id)}>${t.REPLY_TO_MESSAGE}</button>`}
5    ${permissions.canDelete &&
6    html`<button t-action="delete" onClick=${() => chatbox.deleteMessage(message.id)}>${t.DELETE_MESSAGE}</button>`}
7    <button t-action="example" onClick=${() => console.log('This is an example message action')}>
8      Example message action
9    </button>
10  </div>
11`;

You should now see Example message action in the message action menu for your messages:

Check your browser console, and you should see "This is an example message action" logged to the console.

Once you're using TalkJS in production you'll need to enable authentication, so that only legitimate users can connect to your chat. You'll need a backend server that can generate tokens for your users to authenticate with. See our Authentication docs for more detail on how to set this up.

To pass the token to your chatbox, add the token prop:

1<t-chatbox
2  app-id={appId}
3  user-id={userId}
4  conversation-id={conversationId}
5  theme={customTheme}
6  token={token}
7/>

You also need to pass the token to your session:

1const session = getTalkSession({ appId, userId, token });

The token is different each time you connect to TalkJS, so you'll need to call your backend to generate it.

Once you are happy that your chat is loading without errors when you provide a token, go the the Settings page of your dashboard and enable the Authentication (identity verification) option in the Security settings section. When authentication is enabled, only users with a valid token can connect to your chat.

For more ways to customize your chat, see our Chatbox reference docs.