Collaborative Whiteboard Bubble

The CometChatCollaborativeWhiteboardBubble component renders collaborative whiteboard messages within chat. It displays a banner image, title, subtitle, and an action button that opens the whiteboard in a new fullscreen window.

Overview

The Collaborative Whiteboard Bubble component processes CometChat.CustomMessage objects of type extension_whiteboard to display collaborative whiteboard content:

Message Object Processing: Extracts whiteboard URL from message metadata
Theme-aware Banner Images: Automatically selects light/dark banner images based on current theme
Localized Text: Displays title, subtitle, and button text using localization keys
Sender/Receiver Styling: Supports outgoing (right-aligned) and incoming (left-aligned) visual variants
Action Button: Opens the whiteboard URL in a new fullscreen window
Accessibility: Full keyboard navigation and screen reader support

Live Preview — Default collaborative whiteboard bubble preview. Open in Storybook ↗

Basic Usage

Simple Whiteboard Message

import { Component } from '@angular/core';
import { CometChat } from '@cometchat/chat-sdk-javascript';
import { 
  CometChatCollaborativeWhiteboardBubbleComponent, 
  MessageBubbleAlignment 
} from '@cometchat/chat-uikit-angular';

@Component({
  selector: 'app-whiteboard-message',
  standalone: true,
  imports: [CometChatCollaborativeWhiteboardBubbleComponent],
  template: `
    <cometchat-collaborative-whiteboard-bubble
      [message]="whiteboardMessage"
      [alignment]="MessageBubbleAlignment.LEFT"
    ></cometchat-collaborative-whiteboard-bubble>
  `
})
export class WhiteboardMessageComponent {
  whiteboardMessage!: CometChat.CustomMessage;
  MessageBubbleAlignment = MessageBubbleAlignment;
}

Incoming vs Outgoing Messages

import { Component } from '@angular/core';
import { CometChat } from '@cometchat/chat-sdk-javascript';
import { 
  CometChatCollaborativeWhiteboardBubbleComponent, 
  MessageBubbleAlignment 
} from '@cometchat/chat-uikit-angular';

@Component({
  selector: 'app-message-list',
  standalone: true,
  imports: [CometChatCollaborativeWhiteboardBubbleComponent],
  template: `
    <!-- Incoming message (left-aligned) -->
    <cometchat-collaborative-whiteboard-bubble
      [message]="incomingMessage"
      [alignment]="MessageBubbleAlignment.LEFT"
    ></cometchat-collaborative-whiteboard-bubble>

    <!-- Outgoing message (right-aligned) -->
    <cometchat-collaborative-whiteboard-bubble
      [message]="outgoingMessage"
      [alignment]="MessageBubbleAlignment.RIGHT"
    ></cometchat-collaborative-whiteboard-bubble>
  `
})
export class MessageListComponent {
  incomingMessage!: CometChat.CustomMessage;
  outgoingMessage!: CometChat.CustomMessage;
  MessageBubbleAlignment = MessageBubbleAlignment;
}

With Event Handler

import { Component } from '@angular/core';
import { CometChat } from '@cometchat/chat-sdk-javascript';
import { CometChatCollaborativeWhiteboardBubbleComponent } from '@cometchat/chat-uikit-angular';

@Component({
  selector: 'app-interactive-whiteboard',
  standalone: true,
  imports: [CometChatCollaborativeWhiteboardBubbleComponent],
  template: `
    <cometchat-collaborative-whiteboard-bubble
      [message]="whiteboardMessage"
      (buttonClick)="onWhiteboardOpen($event)"
    ></cometchat-collaborative-whiteboard-bubble>
  `
})
export class InteractiveWhiteboardComponent {
  whiteboardMessage!: CometChat.CustomMessage;

  onWhiteboardOpen(url: string): void {
    console.log('Whiteboard opened:', url);
    // Custom handling - the component already opens the URL in a new window
  }
}

Properties

Property	Type	Default	Description
`message`	`CometChat.CustomMessage`	required	The CometChat.CustomMessage object containing collaborative whiteboard metadata
`alignment`	`MessageBubbleAlignment`	`MessageBubbleAlignment.LEFT`	The alignment of the message bubble. `LEFT` for incoming/receiver messages, `RIGHT` for outgoing/sender messages
`disableInteraction`	`boolean`	`false`	When true, disables the action button and other interactive elements within the bubble

Events

Event	Payload Type	Description
`buttonClick`	`string`	Emitted when the action button is clicked. Contains the whiteboard URL string

Message Metadata Structure

The component extracts the whiteboard URL from the following metadata path:

{
  "@injected": {
    "extensions": {
      "whiteboard": {
        "board_url": "https://example.com/whiteboard/456"
      }
    }
  }
}

Advanced Usage

Complete Chat Message Component

import { Component, Input } from '@angular/core';
import { CommonModule } from '@angular/common';
import { CometChat } from '@cometchat/chat-sdk-javascript';
import { 
  CometChatCollaborativeWhiteboardBubbleComponent, 
  MessageBubbleAlignment 
} from '@cometchat/chat-uikit-angular';

@Component({
  selector: 'app-whiteboard-chat-message',
  standalone: true,
  imports: [CommonModule, CometChatCollaborativeWhiteboardBubbleComponent],
  template: `
    <div class="message-container" [class.outgoing]="isOutgoing">
      <div class="message-bubble">
        <cometchat-collaborative-whiteboard-bubble
          [message]="message"
          [alignment]="alignment"
          (buttonClick)="handleWhiteboardOpen($event)"
        ></cometchat-collaborative-whiteboard-bubble>
      </div>
      <div class="message-metadata">
        <span class="timestamp">{{ message.getSentAt() * 1000 | date:'short' }}</span>
      </div>
    </div>
  `,
  styles: [`
    .message-container {
      display: flex;
      flex-direction: column;
      margin-bottom: 12px;
      max-width: 70%;
    }

    .message-container.outgoing {
      align-self: flex-end;
      align-items: flex-end;
    }

    .message-bubble {
      display: inline-block;
    }

    .message-metadata {
      display: flex;
      align-items: center;
      gap: 6px;
      margin-top: 4px;
      font-size: 11px;
      color: #999;
    }
  `]
})
export class WhiteboardChatMessageComponent {
  @Input() message!: CometChat.CustomMessage;
  @Input() loggedInUserId!: string;

  get isOutgoing(): boolean {
    return this.message.getSender().getUid() === this.loggedInUserId;
  }

  get alignment(): MessageBubbleAlignment {
    return this.isOutgoing ? MessageBubbleAlignment.RIGHT : MessageBubbleAlignment.LEFT;
  }

  handleWhiteboardOpen(url: string): void {
    console.log('Whiteboard URL:', url);
    // Additional tracking or custom handling
  }
}

Message List with Whiteboard Bubbles

import { Component, OnInit } from '@angular/core';
import { CommonModule } from '@angular/common';
import { CometChat } from '@cometchat/chat-sdk-javascript';
import { 
  CometChatCollaborativeWhiteboardBubbleComponent, 
  MessageBubbleAlignment 
} from '@cometchat/chat-uikit-angular';

@Component({
  selector: 'app-whiteboard-message-list',
  standalone: true,
  imports: [CommonModule, CometChatCollaborativeWhiteboardBubbleComponent],
  template: `
    <div class="message-list">
      @for (message of messages; track message.getId()) {
        <div class="message-wrapper" [class.outgoing]="isOutgoing(message)">
          <cometchat-collaborative-whiteboard-bubble
            [message]="message"
            [alignment]="getAlignment(message)"
            (buttonClick)="onWhiteboardOpen($event)"
          ></cometchat-collaborative-whiteboard-bubble>
        </div>
      }
    </div>
  `,
  styles: [`
    .message-list {
      display: flex;
      flex-direction: column;
      gap: 8px;
      padding: 16px;
    }

    .message-wrapper {
      display: flex;
      max-width: 70%;
    }

    .message-wrapper.outgoing {
      align-self: flex-end;
    }
  `]
})
export class WhiteboardMessageListComponent implements OnInit {
  messages: CometChat.CustomMessage[] = [];
  loggedInUser!: CometChat.User;

  async ngOnInit(): Promise<void> {
    this.loggedInUser = await CometChat.getLoggedinUser();
  }

  isOutgoing(message: CometChat.CustomMessage): boolean {
    return message.getSender().getUid() === this.loggedInUser?.getUid();
  }

  getAlignment(message: CometChat.CustomMessage): MessageBubbleAlignment {
    return this.isOutgoing(message) 
      ? MessageBubbleAlignment.RIGHT 
      : MessageBubbleAlignment.LEFT;
  }

  onWhiteboardOpen(url: string): void {
    console.log('Opening whiteboard:', url);
  }
}

Customization

Styling with CSS Variables

The Collaborative Whiteboard Bubble component uses CSS variables exclusively for easy customization:

/* Custom whiteboard bubble styling */
cometchat-collaborative-whiteboard-bubble {
  /* Spacing */
  --cometchat-spacing-1: 4px;
  --cometchat-spacing-2: 8px;
  --cometchat-spacing-3: 12px;
  --cometchat-spacing-4: 16px;

  /* Typography */
  --cometchat-font-heading4-medium: 500 16px 'Inter';
  --cometchat-font-body-regular: 400 14px 'Inter';
  --cometchat-font-button-medium: 500 14px 'Inter';

  /* Colors - Incoming messages */
  --cometchat-background-color-01: #FFFFFF;
  --cometchat-background-color-02: #F5F5F5;
  --cometchat-text-color-primary: #141414;
  --cometchat-text-color-secondary: #666666;

  /* Colors - Outgoing messages */
  --cometchat-primary-button-background: #6852D6;
  --cometchat-primary-button-text: #FFFFFF;

  /* Border radius */
  --cometchat-radius-2: 8px;
  --cometchat-radius-3: 12px;

  /* Border colors */
  --cometchat-border-color-light: #E0E0E0;
}

Available CSS Variables

Variable	Purpose	Default
`--cometchat-spacing-1` to `--cometchat-spacing-4`	Padding, margin, gap	`4px` to `16px`
`--cometchat-font-heading4-medium`	Title font	`500 16px Roboto`
`--cometchat-font-body-regular`	Subtitle font	`400 14px Roboto`
`--cometchat-font-button-medium`	Button text font	`500 14px Roboto`
`--cometchat-background-color-01`	Bubble background	`#FFFFFF`
`--cometchat-background-color-02`	Body section background	`#F5F5F5`
`--cometchat-text-color-primary`	Title color	`#141414`
`--cometchat-text-color-secondary`	Subtitle color	`#666666`
`--cometchat-primary-button-background`	Button background	`#6852D6`
`--cometchat-primary-button-text`	Button text color	`#FFFFFF`
`--cometchat-radius-2`	Border radius	`8px`
`--cometchat-border-color-light`	Border color	`#E0E0E0`

Custom Color Schemes

/* Blue theme */
.theme-blue cometchat-collaborative-whiteboard-bubble {
  --cometchat-primary-button-background: #1976D2;
  --cometchat-primary-color: #1976D2;
}

/* Green theme */
.theme-green cometchat-collaborative-whiteboard-bubble {
  --cometchat-primary-button-background: #4CAF50;
  --cometchat-primary-color: #4CAF50;
}

/* Dark theme */
[data-theme="dark"] cometchat-collaborative-whiteboard-bubble {
  --cometchat-background-color-01: #1E1E1E;
  --cometchat-background-color-02: #2C2C2C;
  --cometchat-text-color-primary: #FFFFFF;
  --cometchat-text-color-secondary: #B0B0B0;
  --cometchat-border-color-light: #404040;
}

Custom Button Styling

/* Custom button styling */
::ng-deep .cometchat-collaborative-whiteboard-bubble__button {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border-radius: 20px;
  padding: 10px 20px;
  font-weight: 600;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  transition: transform 0.2s, box-shadow 0.2s;
}

::ng-deep .cometchat-collaborative-whiteboard-bubble__button:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

Accessibility

The Collaborative Whiteboard Bubble component is fully accessible and follows WCAG 2.1 Level AA guidelines.

WCAG 2.1 Compliance

✅ 1.1.1 Non-text Content (Level A): Banner image has empty alt attribute (decorative)
✅ 1.3.1 Info and Relationships (Level A): Proper semantic structure with button element
✅ 2.1.1 Keyboard (Level A): All functionality available via keyboard
✅ 2.4.7 Focus Visible (Level AA): Clear focus indicators on action button
✅ 4.1.2 Name, Role, Value (Level A): Action button has accessible name via aria-label

Keyboard Support

Key	Action	Context
`Tab`	Navigate to action button	When component is in focus order
`Shift + Tab`	Navigate backwards	When button is focused
`Enter`	Activate button	When button is focused
`Space`	Activate button	When button is focused

ARIA Attributes

Attribute	Element	Value	Purpose
`aria-label`	Action button	Localized button text	Provides accessible name
`alt`	Banner image	Empty string	Marks image as decorative

Screen readers announce the component with:

Banner image: Skipped (decorative)
Title: “Collaborative Whiteboard” (or localized equivalent)
Subtitle: “Open whiteboard to draw together” (or localized equivalent)
Button: “Open Whiteboard, button” (or localized equivalent)

Best Practices

Always provide the complete CometChat.CustomMessage object to ensure the whiteboard URL is correctly extracted from metadata.

The component expects the whiteboard URL at metadata["@injected"]["extensions"]["whiteboard"]["board_url"]. Ensure your message objects have this structure.

Use the alignment property to distinguish between incoming and outgoing messages for proper visual styling.

Handle the buttonClick event if you need custom behavior beyond opening the URL in a new window.

The action button is automatically disabled when the whiteboard URL is missing or empty.

The component automatically selects the appropriate banner image based on the current theme (light/dark).

For troubleshooting tips, see the Troubleshooting Guide.

CometChatCollaborativeDocumentBubble: Displays collaborative document messages
CometChatFileBubble: Displays file attachment messages
CometChatMessageBubble: Parent component for message bubbles
CometChatMessageList: Displays lists of messages

Technical Details

Standalone Component: Can be imported and used independently
Change Detection: Uses OnPush change detection strategy for optimal performance
Dependencies:
- Angular CommonModule
- CometChat SDK for message types
- TranslatePipe for localization
BEM CSS: Follows Block Element Modifier naming convention
Accessibility: WCAG 2.1 Level AA compliant

​Overview

​Basic Usage

​Simple Whiteboard Message

​Incoming vs Outgoing Messages

​With Event Handler

​Properties

​Events

​Message Metadata Structure

​Advanced Usage

​Complete Chat Message Component

​Message List with Whiteboard Bubbles

​Customization

​Styling with CSS Variables

​Available CSS Variables

​Custom Color Schemes

​Custom Button Styling

​Accessibility

​WCAG 2.1 Compliance

​Keyboard Support

​ARIA Attributes

​Screen Reader Behavior

​Best Practices

​Related Components

​Technical Details

Overview

Basic Usage

Simple Whiteboard Message

Incoming vs Outgoing Messages

With Event Handler

Properties

Events

Message Metadata Structure

Advanced Usage

Complete Chat Message Component

Message List with Whiteboard Bubbles

Customization

Styling with CSS Variables

Available CSS Variables

Custom Color Schemes

Custom Button Styling

Accessibility

WCAG 2.1 Compliance

Keyboard Support

ARIA Attributes

Screen Reader Behavior

Best Practices

Related Components

Technical Details