115 lines
4.2 KiB
HTML
115 lines
4.2 KiB
HTML
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>PDF Page Extractor and Cover Generator</title>
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<script src="https://cdnjs.cloudflare.com/ajax/libs/pdf-lib/1.17.1/pdf-lib.min.js"></script>
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<script src="https://cdnjs.cloudflare.com/ajax/libs/pdf.js/2.10.377/pdf.min.js"></script>
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<style>
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#pdf-render {
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max-width: 100%;
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height: auto;
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border: 1px solid #ddd;
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margin-top: 20px;
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}
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</style>
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</head>
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<body>
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<h2>Upload a PDF and Extract Specific Pages</h2>
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<input type="file" id="pdfFile" accept="application/pdf">
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<br><br>
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<label for="startPage">Start Page:</label>
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<input type="number" id="startPage" min="1">
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<label for="endPage">End Page:</label>
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<input type="number" id="endPage" min="1">
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<br><br>
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<button onclick="extractPages()">Extract Pages</button>
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<br><br>
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<a id="downloadLink" style="display: none;">Download Extracted PDF</a>
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<h2>Generate PDF Cover Page</h2>
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<input type="file" id="pdf-upload" accept="application/pdf">
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<canvas id="pdf-render"></canvas>
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<script>
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async function extractPages() {
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const fileInput = document.getElementById('pdfFile');
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const startPage = parseInt(document.getElementById('startPage').value);
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const endPage = parseInt(document.getElementById('endPage').value);
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if (!fileInput.files.length) {
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alert('Please upload a PDF file.');
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return;
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}
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if (isNaN(startPage) || isNaN(endPage) || startPage <= 0 || endPage < startPage) {
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alert('Please enter a valid page range.');
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return;
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}
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const file = fileInput.files[0];
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const arrayBuffer = await file.arrayBuffer();
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const pdfDoc = await PDFLib.PDFDocument.load(arrayBuffer);
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const totalPages = pdfDoc.getPageCount();
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if (startPage > totalPages || endPage > totalPages) {
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alert('Page range exceeds the total number of pages in the PDF.');
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return;
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}
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const newPdfDoc = await PDFLib.PDFDocument.create();
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for (let i = startPage - 1; i < endPage; i++) {
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const [copiedPage] = await newPdfDoc.copyPages(pdfDoc, [i]);
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newPdfDoc.addPage(copiedPage);
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}
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const pdfBytes = await newPdfDoc.save();
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const blob = new Blob([pdfBytes], { type: 'application/pdf' });
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const downloadLink = document.getElementById('downloadLink');
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downloadLink.href = URL.createObjectURL(blob);
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downloadLink.download = 'extracted_pages.pdf';
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downloadLink.style.display = 'block';
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downloadLink.textContent = 'Download Extracted PDF';
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}
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document.getElementById('pdf-upload').addEventListener('change', async function(event) {
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const file = event.target.files[0];
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if (file && file.type === "application/pdf") {
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const fileReader = new FileReader();
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fileReader.onload = async function() {
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const typedArray = new Uint8Array(this.result);
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const loadingTask = pdfjsLib.getDocument(typedArray);
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try {
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const pdf = await loadingTask.promise;
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const page = await pdf.getPage(1); // 获取第一页
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const viewport = page.getViewport({ scale: 1.5 });
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const canvas = document.getElementById('pdf-render');
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const context = canvas.getContext('2d');
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canvas.width = viewport.width;
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canvas.height = viewport.height;
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// 渲染页面
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const renderContext = {
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canvasContext: context,
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viewport: viewport
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};
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await page.render(renderContext).promise;
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console.log('封面生成成功');
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} catch (error) {
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console.error('无法加载 PDF 文件:', error);
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}
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};
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fileReader.readAsArrayBuffer(file);
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} else {
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alert('请选择一个有效的 PDF 文件');
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}
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});
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</script>
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</body>
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</html>
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