squibview/examples/example_lazy.html at main · deftio/squibview · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>SquibView Lazy Loading Example</title>
  <link rel="icon" href="data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 32 32'><circle cx='16' cy='16' r='14' fill='%23f57c00' stroke='%23000' stroke-width='1'/><path d='M2 16h28M16 2a14 14 0 0114 14 14 14 0 01-14 14 14 14 0 01-14-14A14 14 0 0116 2zm0 0v28M9 16a7 7 0 0014 0 7 7 0 00-14 0z' fill='none' stroke='%23000' stroke-width='1'/></svg>">

  <!-- SquibView CSS -->
  <link rel="stylesheet" href="../dist/squibview.min.css">

  <!-- Shared example styles -->
  <link rel="stylesheet" href="examples.css">

  <style>
    /* Page-specific styles */
    .status {
      font-family: monospace;
      font-size: 14px;
    }

    #editor1, #editor2 {
      height: 600px;
    }
  </style>
</head>
<body>
  <div class="example-header">
    <h1 class="example-title">SquibView Lazy Loading Demo</h1>
    <p class="example-description">This example demonstrates the lazy-loading build of SquibView. Libraries like Mermaid, Highlight.js, MathJax, Leaflet, and Three.js are loaded only when needed.</p>
    <div id="status" class="status">Initializing...</div>
  </div>

  <!-- First Instance -->
  <div class="instance-container">
    <div class="instance-label">Instance 1: Full Feature Demo</div>
    <div id="editor1" class="editor-container"></div>
  </div>

  <!-- Second Instance -->
  <div class="instance-container">
    <div class="instance-label">Instance 2: Testing Duplicate Prevention</div>
    <div id="editor2" class="editor-container"></div>
  </div>

  <script type="module">
    import SquibView from '../dist/squibview.lazy.esm.min.js';

    const statusEl = document.getElementById('status');

    // Track library loading
    const originalLog = console.log;
    const originalError = console.error;
    let loadedLibraries = [];

    console.log = function(...args) {
      const msg = args.join(' ');
      if (msg.includes('SquibView')) {
        statusEl.textContent = msg;
      }
      originalLog.apply(console, args);
    };

    console.error = function(...args) {
      const msg = args.join(' ');
      if (msg.includes('SquibView')) {
        statusEl.textContent = '❌ ' + msg;
        statusEl.style.background = '#ffebee';
      }
      originalError.apply(console, args);
    };

    // Monitor script loading
    const observer = new MutationObserver((mutations) => {
      mutations.forEach((mutation) => {
        mutation.addedNodes.forEach((node) => {
          if (node.tagName === 'SCRIPT') {
            const libName =
              node.src.includes('mermaid') ? 'Mermaid' :
              node.src.includes('highlight') ? 'Highlight.js' :
              node.src.includes('mathjax') ? 'MathJax' :
              node.src.includes('leaflet') ? 'Leaflet' :
              node.src.includes('three') ? 'Three.js' :
              'Unknown';

            if (libName !== 'Unknown') {
              loadedLibraries.push(libName);
              statusEl.textContent = `✅ Lazy loaded: ${libName} (Total: ${loadedLibraries.join(', ')})`;
              statusEl.style.background = '#e8f5e9';
            }
          }
        });
      });
    });

    observer.observe(document.head, { childList: true });

    // Sample content with various features
    const sampleContent = `# SquibView Lazy Loading Test

## Markdown Rendering (Built-in)
This basic markdown rendering is handled by the bundled markdown-it library.

- Lists work immediately
- **Bold** and *italic* text
- [Links](https://github.com) work out of the box

## Code Highlighting (Lazy Loaded)

The following code block will trigger lazy loading of highlight.js:

\`\`\`javascript
// This will be syntax highlighted after hljs loads
function fibonacci(n) {
  if (n <= 1) return n;
  return fibonacci(n - 1) + fibonacci(n - 2);
}

console.log(fibonacci(10));
\`\`\`

## Math Equations (Lazy Loaded)

Inline math: $E = mc^2$ and block math:

$$
\\int_{-\\infty}^{\\infty} e^{-x^2} dx = \\sqrt{\\pi}
$$

## Mermaid Diagrams (Lazy Loaded)

\`\`\`mermaid
graph TD
    A[Start] --> B{Is Lazy Loading?}
    B -->|Yes| C[Load Only When Needed]
    B -->|No| D[Load Everything]
    C --> E[Save Bandwidth]
    D --> F[Larger Initial Load]
\`\`\`

## Geographic Data (Lazy Loaded)

\`\`\`geojson
{
  "type": "Feature",
  "geometry": {
    "type": "Point",
    "coordinates": [-122.4194, 37.7749]
  },
  "properties": {
    "name": "San Francisco",
    "description": "Leaflet loads only when this appears!"
  }
}
\`\`\`

## 3D Models (Lazy Loaded)

\`\`\`stl
solid cube
  facet normal 0 0 1
    outer loop
      vertex 0 0 1
      vertex 1 0 1
      vertex 1 1 1
    endloop
  endfacet
  facet normal 0 0 1
    outer loop
      vertex 0 0 1
      vertex 1 1 1
      vertex 0 1 1
    endloop
  endfacet
endsolid
\`\`\`
`;

    // Initialize first editor
    statusEl.textContent = 'Initializing Editor 1...';
    const editor1 = new SquibView('#editor1', {
      initialContent: sampleContent,
      view: 'split',
      theme: 'default'
    });

    // Initialize second editor with simpler content
    setTimeout(() => {
      statusEl.textContent = 'Initializing Editor 2...';
      const editor2 = new SquibView('#editor2', {
        initialContent: '# Second Instance\n\nThis tests that libraries are not loaded twice.\n\n```javascript\nconst test = "duplicate prevention";\n```',
        view: 'split',
        theme: 'default'
      });
    }, 1000);

    // Report final status
    setTimeout(() => {
      if (loadedLibraries.length > 0) {
        const unique = [...new Set(loadedLibraries)];
        statusEl.textContent = `✅ Successfully lazy loaded: ${unique.join(', ')}`;
        statusEl.style.background = '#c8e6c9';
      } else {
        statusEl.textContent = 'ℹ️ No external libraries needed yet';
      }
    }, 5000);
  </script>
</body>
</html>