public/pdfjs-viewer/form-viewer.html

<!DOCTYPE html>
<html dir="ltr" mozdisallowselectionprint>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
  <meta name="google" content="notranslate">
  <title>PDF Form Filler - Bento PDF</title>
  <link rel="stylesheet" href="pdf_viewer.css">
  <link rel="stylesheet" href="viewer.css">
  <style>
    body {
      margin: 0;
      padding: 0;
      font-family: sans-serif;
      background-color: #525252;
    }
    
    #viewerContainer {
      position: absolute;
      top: 0;
      right: 0;
      bottom: 0;
      left: 0;
      overflow: auto;
      background-color: #404040;
    }
    
    .toolbar {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      height: 48px;
      background-color: #323639;
      box-shadow: 0 1px 4px rgba(0,0,0,0.3);
      display: flex;
      align-items: center;
      padding: 0 10px;
      z-index: 1000;
      gap: 10px;
    }
    
    .toolbar button {
      background-color: rgba(255,255,255,0.1);
      border: none;
      color: #fff;
      padding: 8px 12px;
      cursor: pointer;
      border-radius: 4px;
      font-size: 13px;
    }
    
    .toolbar button:hover {
      background-color: rgba(255,255,255,0.2);
    }
    
    .toolbar button:disabled {
      opacity: 0.5;
      cursor: not-allowed;
    }
    
    .toolbar .page-info {
      color: #fff;
      font-size: 13px;
      margin: 0 10px;
    }
    
    .toolbar input[type="number"] {
      width: 60px;
      padding: 4px 8px;
      background-color: rgba(255,255,255,0.1);
      border: 1px solid rgba(255,255,255,0.2);
      color: #fff;
      border-radius: 4px;
      text-align: center;
    }
    
    #viewerContainer {
      top: 48px;
    }
    
    #viewer {
      padding-top: 20px;
    }
    
    .page {
      margin: 10px auto;
      border: 1px solid #999;
      box-shadow: 0 4px 10px rgba(0,0,0,0.5);
    }
    
    .toolbar .spacer {
      flex: 1;
    }
    
    .toolbar .zoom-controls {
      display: flex;
      gap: 5px;
      align-items: center;
    }
    
    .toolbar select {
      background-color: rgba(255,255,255,0.1);
      border: 1px solid rgba(255,255,255,0.2);
      color: #fff;
      padding: 6px 10px;
      border-radius: 4px;
      cursor: pointer;
    }
    
    .toolbar select option {
      background-color: #323639;
      color: #fff;
    }
  </style>
</head>
<body>
  <div class="toolbar">
    <button id="previousPage" title="Previous Page">‹</button>
    <input type="number" id="pageNumber" min="1" value="1">
    <span class="page-info">/ <span id="numPages">--</span></span>
    <button id="nextPage" title="Next Page">›</button>
    
    <div class="spacer"></div>
    
    <div class="zoom-controls">
      <button id="zoomOut" title="Zoom Out">−</button>
      <select id="scaleSelect">
        <option value="auto">Auto</option>
        <option value="page-fit">Fit Page</option>
        <option value="page-width">Fit Width</option>
        <option value="0.5">50%</option>
        <option value="0.75">75%</option>
        <option value="1" selected>100%</option>
        <option value="1.25">125%</option>
        <option value="1.5">150%</option>
        <option value="2">200%</option>
      </select>
      <button id="zoomIn" title="Zoom In">+</button>
    </div>
    
    <button id="download" title="Save & Download">Download</button>
  </div>
  
  <div id="viewerContainer">
    <div id="viewer" class="pdfViewer"></div>
  </div>

  <script type="module">
    import * as pdfjsLib from './pdf.mjs';
    import { EventBus, PDFViewer, PDFLinkService } from './pdf_viewer.mjs';

    pdfjsLib.GlobalWorkerOptions.workerSrc = './pdf.worker.mjs';

    const eventBus = new EventBus();
    const linkService = new PDFLinkService({ eventBus });
    
    const pdfViewer = new PDFViewer({
      container: document.getElementById('viewerContainer'),
      viewer: document.getElementById('viewer'),
      eventBus,
      linkService,
      enableScripting: true,
      enableXfa: true,
      renderer: 'canvas'
    });
    
    linkService.setViewer(pdfViewer);

    let pdfDocument = null;
    let currentScale = 1.0;

    // Listen for messages from parent window
    window.addEventListener('message', async (event) => {
      if (event.data.type === 'loadPDF') {
        const { data } = event.data;
        loadPDF(data);
      } else if (event.data.type === 'getData') {
        const pdfData = await getPDFData();
        window.parent.postMessage({ type: 'pdfData', data: pdfData }, '*');
      }
    });

    async function loadPDF(data) {
      try {
        const loadingTask = pdfjsLib.getDocument({
          data,
          enableXfa: true,
        });
        pdfDocument = await loadingTask.promise;
        pdfViewer.setDocument(pdfDocument);
        linkService.setDocument(pdfDocument);
        
        document.getElementById('numPages').textContent = pdfDocument.numPages;
        document.getElementById('pageNumber').max = pdfDocument.numPages;
        
        // Notify parent that PDF is loaded
        window.parent.postMessage({ type: 'pdfLoaded', numPages: pdfDocument.numPages }, '*');
      } catch (error) {
        console.error('Error loading PDF:', error);
        window.parent.postMessage({ type: 'error', message: error.message }, '*');
      }
    }

    async function getPDFData() {
      if (!pdfDocument) return null;
      
      // Get the PDF data with form fields filled
      const data = await pdfDocument.saveDocument();
      return data;
    }

    // Navigation controls
    document.getElementById('previousPage').addEventListener('click', () => {
      if (pdfViewer.currentPageNumber > 1) {
        pdfViewer.currentPageNumber--;
      }
    });

    document.getElementById('nextPage').addEventListener('click', () => {
      if (pdfViewer.currentPageNumber < pdfDocument?.numPages) {
        pdfViewer.currentPageNumber++;
      }
    });

    document.getElementById('pageNumber').addEventListener('change', (e) => {
      const pageNum = parseInt(e.target.value);
      if (pageNum >= 1 && pageNum <= pdfDocument?.numPages) {
        pdfViewer.currentPageNumber = pageNum;
      }
    });

    // Zoom controls
    document.getElementById('zoomIn').addEventListener('click', () => {
      currentScale = Math.min(currentScale + 0.1, 3.0);
      pdfViewer.currentScale = currentScale;
      document.getElementById('scaleSelect').value = currentScale.toFixed(2);
    });

    document.getElementById('zoomOut').addEventListener('click', () => {
      currentScale = Math.max(currentScale - 0.1, 0.1);
      pdfViewer.currentScale = currentScale;
      document.getElementById('scaleSelect').value = currentScale.toFixed(2);
    });

    document.getElementById('scaleSelect').addEventListener('change', (e) => {
      const value = e.target.value;
      if (value === 'auto' || value === 'page-fit' || value === 'page-width') {
        pdfViewer.currentScaleValue = value;
      } else {
        currentScale = parseFloat(value);
        pdfViewer.currentScale = currentScale;
      }
    });

    // Download button
    document.getElementById('download').addEventListener('click', async () => {
      const data = await getPDFData();
      if (data) {
        window.parent.postMessage({ type: 'downloadPDF', data: Array.from(data) }, '*');
      }
    });

    // Update page number display when page changes
    eventBus.on('pagechanging', (evt) => {
      document.getElementById('pageNumber').value = evt.pageNumber;
      document.getElementById('previousPage').disabled = evt.pageNumber <= 1;
      document.getElementById('nextPage').disabled = evt.pageNumber >= pdfDocument?.numPages;
    });

    // Notify parent that viewer is ready
    window.parent.postMessage({ type: 'viewerReady' }, '*');
  </script>
</body>
</html>