Frontend-Widgets/html-pattern-generator.html at main · monapdx/Frontend-Widgets · 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>HTML Pattern Instance Generator</title>
  <style>
html { -webkit-text-size-adjust: 100%; }
img, video, canvas, svg { max-width: 100%; height: auto; }


    * { box-sizing: border-box; }
    body {
      margin: 0;
      font-family: Arial, sans-serif;
      background: #f6f7fb;
      color: #1f2937;
    }
    .app {
      max-width: 1100px;
      margin: 0 auto;
      padding: 24px;
      display: grid;
      grid-template-columns: 360px 1fr;
      gap: 20px;
    }
    .panel {
      background: #fff;
      border: 1px solid #e5e7eb;
      border-radius: 16px;
      padding: 18px;
      box-shadow: 0 8px 30px rgba(0,0,0,0.05);
    }
    h1 {
      margin: 0 0 8px;
      font-size: 1.5rem;
    }
    p {
      margin: 0 0 16px;
      line-height: 1.45;
      color: #4b5563;
    }
    label {
      display: block;
      margin: 14px 0 8px;
      font-weight: 700;
      font-size: 0.95rem;
    }
    textarea, input {
      width: 100%;
      border: 1px solid #d1d5db;
      border-radius: 10px;
      padding: 12px;
      font: inherit;
      background: #fff;
    }
    textarea {
      min-height: 220px;
      resize: vertical;
      line-height: 1.45;
    }
    .hint {
      margin-top: 8px;
      font-size: 0.86rem;
      color: #6b7280;
    }
    .buttons {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 16px;
    }
    button {
      border: 0;
      border-radius: 999px;
      padding: 10px 16px;
      font: inherit;
      font-weight: 700;
      cursor: pointer;
      background: #111827;
      color: #fff;
    }
    button.secondary {
      background: #e5e7eb;
      color: #111827;
    }
    .output-grid {
      display: grid;
      gap: 16px;
    }
    .output-box {
      border: 1px solid #e5e7eb;
      border-radius: 12px;
      overflow: hidden;
      background: #fff;
    }
    .output-box h2 {
      margin: 0;
      padding: 12px 14px;
      font-size: 0.95rem;
      background: #f9fafb;
      border-bottom: 1px solid #e5e7eb;
    }
    .output-box .content {
      padding: 14px;
    }
    .output-toolbar {
      display: flex;
      justify-content: flex-end;
      gap: 10px;
      margin-bottom: 12px;
    }
    .mini-btn {
      border-radius: 999px;
      padding: 8px 12px;
      font-size: 0.88rem;
      background: #eef2ff;
      color: #1f2937;
    }
    #preview {
      min-height: 240px;
      background: linear-gradient(180deg, #ffffff 0%, #fbfbfd 100%);
    }
    pre {
      margin: 0;
      white-space: pre-wrap;
      word-break: break-word;
      font-family: Consolas, Monaco, monospace;
      font-size: 0.9rem;
    }
    .example-card {
      border: 1px dashed #cbd5e1;
      border-radius: 12px;
      padding: 12px;
      margin-top: 14px;
      background: #f8fafc;
    }
    .example-card code {
      display: block;
      white-space: pre-wrap;
      font-family: Consolas, Monaco, monospace;
      font-size: 0.85rem;
      color: #0f172a;
    }
    @media (max-width: 860px) {
      .app {
        grid-template-columns: 1fr;
      }
    }
  </style>
</head>
<body>
  <div class="app">
    <section class="panel">
      <h1>HTML Pattern Instance Generator</h1>
      <p>
        Paste an HTML pattern, choose how many copies you want, and use placeholders like
        <strong>{{i}}</strong>, <strong>{{n}}</strong>, or <strong>{{i:02}}</strong>.
      </p>

      <label for="count">Number of instances</label>
      <input id="count" type="number" min="1" value="6" />

      <label for="pattern">HTML pattern</label>
      <textarea id="pattern"><div class="card card-{{i}}">
  <h3>Card {{i}}</h3>
  <p>This is item {{i}} of {{n}}.</p>
  <a href="#item-{{i:02}}">Open item {{i:02}}</a>
</div></textarea>
      <div class="hint">
        Supported placeholders: {{i}} = current number, {{n}} = total count, {{i:02}} = zero-padded index.
      </div>

      <div class="buttons">
        <button id="generateBtn">Generate</button>
        <button id="copyBtn" class="secondary">Copy HTML</button>
        <button id="copyPreviewBtn" class="secondary">Copy Preview HTML</button>
        <button id="downloadBtn" class="secondary">Download .html</button>
      </div>

      <div class="example-card">
        <strong>Example pattern idea</strong>
        <code>&lt;li class="menu-item item-{{i}}"&gt;Menu Item {{i}}&lt;/li&gt;</code>
      </div>
    </section>

    <section class="output-grid">
      <div class="panel output-box">
        <h2>Rendered preview</h2>
        <div class="content">
          <div class="output-toolbar">
            <button id="copyRenderedBtn" class="mini-btn">Copy Rendered HTML</button>
          </div>
          <div id="preview"></div>
        </div>
      </div>

      <div class="panel output-box">
        <h2>Generated HTML</h2>
        <div class="content">
          <div class="output-toolbar">
            <button id="copyCodeBtn" class="mini-btn">Copy Code</button>
          </div>
          <pre id="codeOutput"></pre>
        </div>
      </div>
    </section>
  </div>

  <script>
    const countInput = document.getElementById('count');
    const patternInput = document.getElementById('pattern');
    const preview = document.getElementById('preview');
    const codeOutput = document.getElementById('codeOutput');
    const generateBtn = document.getElementById('generateBtn');
    const copyBtn = document.getElementById('copyBtn');
    const copyPreviewBtn = document.getElementById('copyPreviewBtn');
    const copyRenderedBtn = document.getElementById('copyRenderedBtn');
    const copyCodeBtn = document.getElementById('copyCodeBtn');
    const downloadBtn = document.getElementById('downloadBtn');

    function padNumber(value, width) {
      return String(value).padStart(width, '0');
    }

    function fillPattern(pattern, index, total) {
      return pattern
        .replace(/\{\{\s*n\s*\}\}/g, total)
        .replace(/\{\{\s*i:(\d+)\s*\}\}/g, (_, width) => padNumber(index, Number(width)))
        .replace(/\{\{\s*i\s*\}\}/g, index);
    }

    function generateInstances() {
      const total = Math.max(1, Number(countInput.value) || 1);
      const pattern = patternInput.value;
      const parts = [];

      for (let i = 1; i <= total; i += 1) {
        parts.push(fillPattern(pattern, i, total));
      }

      const html = parts.join('\n\n');
      preview.innerHTML = html;
      codeOutput.textContent = html;
      return html;
    }

    async function copyTextToClipboard(text, button, defaultLabel) {
      try {
        await navigator.clipboard.writeText(text);
        button.textContent = 'Copied!';
        setTimeout(() => {
          button.textContent = defaultLabel;
        }, 1200);
      } catch (error) {
        alert('Could not copy to clipboard.');
      }
    }

    async function copyHtml() {
      const html = generateInstances();
      await copyTextToClipboard(html, copyBtn, 'Copy HTML');
    }

    async function copyPreviewHtml() {
      generateInstances();
      await copyTextToClipboard(preview.innerHTML, copyPreviewBtn, 'Copy Preview HTML');
    }

    async function copyRenderedHtml() {
      generateInstances();
      await copyTextToClipboard(preview.innerHTML, copyRenderedBtn, 'Copy Rendered HTML');
    }

    async function copyCodeHtml() {
      const html = generateInstances();
      await copyTextToClipboard(html, copyCodeBtn, 'Copy Code');
    }

    function downloadHtml() {
      const html = generateInstances();
      const blob = new Blob([html], { type: 'text/html' });
      const url = URL.createObjectURL(blob);
      const a = document.createElement('a');
      a.href = url;
      a.download = 'generated-patterns.html';
      a.click();
      URL.revokeObjectURL(url);
    }

    generateBtn.addEventListener('click', generateInstances);
    copyBtn.addEventListener('click', copyHtml);
    copyPreviewBtn.addEventListener('click', copyPreviewHtml);
    copyRenderedBtn.addEventListener('click', copyRenderedHtml);
    copyCodeBtn.addEventListener('click', copyCodeHtml);
    downloadBtn.addEventListener('click', downloadHtml);

    countInput.addEventListener('input', generateInstances);
    patternInput.addEventListener('input', generateInstances);

    generateInstances();
  </script>
</body>
</html>