---
description: API reference for RtkJoinButton component (Flutter Library)
title: RtkJoinButton
image: https://developers.cloudflare.com/og-docs.png
---

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# RtkJoinButton

Last updated Aug 24, 2026|Copy as Markdown| [View as Markdown](https://0f4bf0fb.previews.developers.cloudflare.com/realtime/realtimekit/ui-kit/api-reference/flutter/rtk-join-button/index.md)| [Agent setup](https://0f4bf0fb.previews.developers.cloudflare.com/agent-setup/)

A button widget for joining a RealtimeKit meeting room. Provides visual feedback during the joining process.

## Properties

| Property | Type | Required | Default | Description |
| --- | --- | --- | --- | --- |
| `meeting` | `RealtimekitClient` | ✅ | - | Meeting client instance |
| `onMeetingJoined` | `VoidCallback?` | ❌ | - | Callback invoked when the meeting is joined |
| `rtkDesignToken` | `RtkDesignTokens?` | ❌ | Global design tokens | Design tokens for customization |
| `height` | `double?` | ❌ | - | Height of the button |
| `width` | `double?` | ❌ | - | Width of the button |
| `isDisabled` | `bool` | ❌ | `false` | Whether the button is disabled |

## Usage Examples

### Basic Usage

```dart
import 'package:realtimekit_ui/realtimekit_ui.dart';

RtkJoinButton(
  meeting: yourMeetingInstance,
)
```

### With Properties

```dart
import 'package:realtimekit_ui/realtimekit_ui.dart';

RtkJoinButton(
  meeting: yourMeetingInstance,
  onMeetingJoined: () {
    // Handle successful join
  },
  height: 50.0,
  width: 200.0,
  isDisabled: false,
)
```

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