panel-visual-badges

name	panel-visual-badges
description	Create visually rich, robust TypeScript UI components with panel architecture, combining enhanced features like retry logic, state persistence, and dynamic styling with a systematic workflow for visual enhancements.

Robust UI Panel Components

Build visually rich, robust TypeScript UI components using a panel architecture pattern. This skill combines enhanced panel features (retry logic, state persistence) with a systematic workflow for adding visual enhancements (badges, thumbnails, dynamic styling).

Architecture Overview

Core Panel Features

• Retry Logic: Automatically retries failed data fetches with exponential backoff.
• State Persistence: Saves panel state (expanded/collapsed, size) to localStorage.
• Detailed Error Handling: Provides granular error messages and recovery options.
• Visual Enhancements: Systematic approach for adding badges, thumbnails, and dynamic styling.

Panel (base class)
├── element: HTMLElement (outer container, .panel)
│   ├── header: HTMLElement (.panel-header)
│   │   ├── headerLeft (.panel-header-left)
│   │   │   ├── title (.panel-title)
│   │   │   └── newBadge (.panel-new-badge) [optional]
│   │   ├── statusBadge (.panel-data-badge) [optional]
│   │   └── countEl (.panel-count) [optional]
│   ├── content: HTMLElement (.panel-content)
│   └── resizeHandle (.panel-resize-handle)

Implementation Workflow

1. Define Constants and Configuration

// Panel configuration
const PANEL_DEFAULTS = {
  maxRetries: 3,
  initialRetryDelay: 1000, // 1s
};

// Visual configuration
const SOURCE_COLORS: { [key: string]: string } = {
  'Category A': '#FF6B6B',
  'Category B': '#4ECDC4',
  'default': '#95A5A6'
};

const THUMBNAIL_SIZE = 48; // pixels

2. Base Panel Class with Enhanced Features

export class Panel {
  protected element: HTMLElement;
  protected content: HTMLElement;
  protected panelId: string;
  private retryAttempts = 0;
  private retryDelay = PANEL_DEFAULTS.initialRetryDelay;

  constructor(options: PanelOptions) {
    // ... existing constructor code ...
    this.loadState();
  }

  protected async fetchWithRetry(url: string):<any> {
    while (this.retryAttempts < PANEL_DEFAULTS.maxRetries) {
      try {
        const response = await fetch(url);
        if (!response.ok) throw new Error(`HTTP ${response.status}`);
        return await response.json();
      } catch (error) {
        this.++;
         (. >= .) {
            ();
        }
          ( (resolve, .));
        . *= ;
      }
    }
  }

   ():  {
    .(, .({
      : !...(),
      : ...,
      : ...
    }));
  }

   ():  {
     savedState = .();
     (savedState) {
       { isExpanded, width, height } = .(savedState);
       (!isExpanded) ...();
       (width) ... = width;
       (height) ... = height;
    }
  }

  
   (: ):  {
     [source] || [];
  }

   (?: ):  {
     imageUrl || ;
  }
}

3. Creating Enhanced Components

export class NewsPanel extends Panel {
  private refreshTimer: ReturnType<typeof setInterval> | null = null;

  constructor() {
    super({ id: 'news', title: 'News Feed', showCount: true });
    this.fetchData();
    this.refreshTimer = setInterval(() => this.fetchData(), 60_000);
  }

  private async fetchData(): Promise<void> {
    try {
      const newsItems = await this.fetchWithRetry('/api/news');
      this.render(newsItems);
      this.setCount(newsItems.length);
      this.saveState();
    } catch (err) {
      this.showError(,  {
        . = ;
        . = .;
        .();
      });
    }
  }

   (: []):  {
     html = items.( ).();

    .();
  }

    ():  {
     (.) (.);
    .();
  }
}

4. Corresponding CSS

/* Panel structure */
.panel {
  border: 1px solid #ddd;
  border-radius: 8px;
  overflow: hidden;
}

/* News item styles */
.news-item {
  display: flex;
  gap: 16px;
  padding: 12px;
  border-bottom: 1px solid #eee;
}

.news-thumbnail {
  width: 48px;
  height: 48px;
  border-radius: 4px;
  object-fit: cover;
}

.news-badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 12px;
  color: white;
  margin-right: 8px;
}

Key Patterns

1. Panel Architecture: Base class handles core functionality (retry logic, state management)
2. Visual Enhancements: Systematic workflow for adding badges, thumbnails, and dynamic styling
3. Separation of Concerns:
   • TypeScript for logic and data-driven styles
   • CSS for structural and static styling
4. Error Handling: Built-in retry logic with user-friendly error displays
5. State Management: Automatic persistence of UI state

Best Practices

1. Constants First: Define colors, sizes, and configuration at the top
2. Helper Methods: Create focused methods for visual transformations
3. Template Literals: Build HTML with clear conditional rendering
4. CSS Coordination: Update stylesheets for every new visual element
5. Testing: Verify with edge cases (missing data, network errors)