denser-chat/viewer.html at main · denser-org/denser-chat · GitHub

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<!DOCTYPE html>
<html>
<head>
    <title>PDF Viewer with Annotations</title>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/pdf.js/3.11.174/pdf.min.js"></script>
    <style>
        body {
            margin: 0;
            padding: 0;
            background-color: #525659;
        }
        #viewerContainer {
            width: 100vw;
            min-height: 100vh;
            padding: 20px;
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 20px;
        }
        .pageContainer {
            position: relative;
            background-color: white;
            box-shadow: 0 0 10px rgba(0,0,0,0.3);
            margin-bottom: 20px;
        }
        .highlight-annotation {
            position: absolute;
            background-color: rgba(255, 255, 0, 0.3);
            border: 2px solid rgba(255, 255, 0, 0.5);
            pointer-events: none;
            z-index: 1;
        }
        .pageNumber {
            position: absolute;
            bottom: -25px;
            left: 50%;
            transform: translateX(-50%);
            background-color: #525659;
            color: white;
            padding: 2px 8px;
            border-radius: 4px;
            font-family: Arial, sans-serif;
        }
    </style>
</head>
<body>
    <div id="viewerContainer"></div>

    <script>
        // Configure PDF.js worker
        pdfjsLib.GlobalWorkerOptions.workerSrc = 'https://cdnjs.cloudflare.com/ajax/libs/pdf.js/3.11.174/pdf.worker.min.js';

        // Get URL parameters
        const urlParams = new URLSearchParams(window.location.search);
        const pdfUrl = urlParams.get('file');
        const initialPageNumber = parseInt(urlParams.get('pageNumber')) || 1;

        // Get annotations array
        let annotations = [];
        try {
            const annotationsParam = urlParams.get('annotations');
            if (annotationsParam) {
                annotations = JSON.parse(annotationsParam);
            }
        } catch (error) {
            console.error('Error parsing annotations:', error);
        }

        console.log('Initial Page:', initialPageNumber);
        console.log('Annotations:', annotations);

        async function renderPage(pdf, pageNumber, scale) {
            // Get the page
            const page = await pdf.getPage(pageNumber);

            // Create page container
            const pageContainer = document.createElement('div');
            pageContainer.className = 'pageContainer';
            pageContainer.id = `page-${pageNumber}`;

            // Create canvas
            const canvas = document.createElement('canvas');
            const context = canvas.getContext('2d');

            // Get viewport
            const viewport = page.getViewport({ scale });

            // Set dimensions
            canvas.width = viewport.width;
            canvas.height = viewport.height;
            pageContainer.style.width = `${viewport.width}px`;
            pageContainer.style.height = `${viewport.height}px`;

            // Add page number
            const pageLabel = document.createElement('div');
            pageLabel.className = 'pageNumber';
            pageLabel.textContent = `Page ${pageNumber}`;
            pageContainer.appendChild(pageLabel);

            // Add canvas to container
            pageContainer.appendChild(canvas);

            // Render PDF page
            await page.render({
                canvasContext: context,
                viewport: viewport
            }).promise;

            // Filter and add highlights for this page
            const pageAnnotations = annotations.filter(ann => (ann.page + 1) === pageNumber);
            if (pageAnnotations.length > 0) {
                console.log(`Adding ${pageAnnotations.length} highlights to page ${pageNumber}`);

                pageAnnotations.forEach((ann, index) => {
                    if (ann.width > 0 && ann.height > 0) {
                        const highlight = document.createElement('div');
                        highlight.className = 'highlight-annotation';

                        // Scale the coordinates
                        const scaledX = ann.x * scale;
                        const scaledY = viewport.height - ((ann.y + ann.height) * scale);
                        const scaledWidth = ann.width * scale;
                        const scaledHeight = ann.height * scale;

                        Object.assign(highlight.style, {
                            left: `${scaledX}px`,
                            top: `${scaledY}px`,
                            width: `${scaledWidth}px`,
                            height: `${scaledHeight}px`
                        });

                        pageContainer.appendChild(highlight);
                        console.log(`Highlight ${index + 1} added on page ${pageNumber}:`, highlight.style);
                    }
                });
            }

            return pageContainer;
        }

        async function renderPDF() {
            try {
                if (!pdfUrl) throw new Error('No PDF URL provided');

                // Load the PDF
                const loadingTask = pdfjsLib.getDocument(pdfUrl);
                const pdf = await loadingTask.promise;

                // Calculate scale
                const firstPage = await pdf.getPage(1);
                const originalViewport = firstPage.getViewport({ scale: 1.0 });
                const desiredWidth = window.innerWidth * 0.8;
                const scale = desiredWidth / originalViewport.width;

                // Get container
                const container = document.getElementById('viewerContainer');

                // Render all pages
                for (let pageNum = 1; pageNum <= pdf.numPages; pageNum++) {
                    const pageContainer = await renderPage(pdf, pageNum, scale);
                    container.appendChild(pageContainer);
                }

                // Scroll to initial page
                const targetPage = document.getElementById(`page-${initialPageNumber}`);
                if (targetPage) {
                    targetPage.scrollIntoView({ behavior: 'smooth', block: 'start' });
                }

            } catch (error) {
                console.error('Error:', error);
                document.getElementById('viewerContainer').innerHTML = `
                    <div style="color: white; padding: 20px;">
                        Error: ${error.message}<br>
                        Please make sure the URL includes the correct parameters.
                    </div>`;
            }
        }

        // Start rendering
        renderPDF();
    </script>
</body>
</html>