# Building a Custom UI (TypeScript)

## Example HTML

```html
<div id="status">Disconnected</div>
<button id="connect">Connect</button>

<div id="chat"></div>

<input id="input" type="text" placeholder="Type message..." disabled />
<button id="send" disabled>Send</button>
```

***

## TypeScript Implementation

```ts
import {
  ConvaiClient,
  type ConvaiClientState,
  type ChatMessage
} from '@convai/web-sdk/vanilla';

const client = new ConvaiClient();

const statusEl = document.getElementById('status') as HTMLDivElement;
const connectBtn = document.getElementById('connect') as HTMLButtonElement;
const chatEl = document.getElementById('chat') as HTMLDivElement;
const inputEl = document.getElementById('input') as HTMLInputElement;
const sendBtn = document.getElementById('send') as HTMLButtonElement;

// State updates
client.on('stateChange', (state) => {
  updateStatus(state);
  updateControls(state);
});

// New messages
client.on('message', (msg) => {
  if (msg.type === 'user-transcription' || msg.type === 'bot-llm-text') {
    addMessageToUI(msg);
  }
});

function updateStatus(state: ConvaiClientState) {
  if (!state.isConnected) return statusEl.textContent = 'Disconnected';
  statusEl.textContent = state.agentState;
}

function updateControls(state: ConvaiClientState) {
  const connected = state.isConnected;
  connectBtn.disabled = connected;
  inputEl.disabled = !connected;
  sendBtn.disabled = !connected;
}

function addMessageToUI(msg: ChatMessage) {
  const div = document.createElement('div');
  div.className = msg.type === 'user-transcription' ? 'user' : 'bot';
  div.textContent = msg.content;
  chatEl.appendChild(div);
  chatEl.scrollTop = chatEl.scrollHeight;
}

// Connect logic
connectBtn.addEventListener('click', async () => {
  await client.connect({
    apiKey: 'your-api-key',
    characterId: 'your-character-id',
    // endUserId: 'user-uuid', // Optional for memory
  });
});

// Send message
function sendMessage() {
  const text = inputEl.value.trim();
  if (text) {
    client.sendUserTextMessage(text);
    inputEl.value = '';
  }
}

sendBtn.addEventListener('click', sendMessage);
inputEl.addEventListener('keypress', (e) => {
  if (e.key === 'Enter') sendMessage();
});
```

***

## Adding Audio/Video Controls

```ts
await client.audioControls.toggleAudio();
await client.videoControls.toggleVideo();
await client.screenShareControls.toggleScreenShare();
```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.convai.com/api-docs/plugins-and-integrations/web-plugins/convai-web-sdk/vanilla-typescript/building-a-custom-ui-typescript.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.