index.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Pdf Web Example</title>
<link rel="stylesheet" href="styles.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/pdf.js/2.3.200/pdf.min.js"></script>
<script src="main.dart.js"></script>
<script>
async function displayPdf(pdf) {
let doc = await pdfjsLib.getDocument(pdf).promise;
document.getElementById('page_count').innerText = doc.numPages;
let metadata = await doc.getMetadata();
let title = metadata.info.Title || 'Untitled';
document.getElementById('title').innerText = title;
document.title = title;
let author = metadata.info.Author || '';
let producer = metadata.info.Producer || '';
document.getElementById('author').innerText = author + ' | ' + producer;
let currentPage = 1;
document.getElementById('prev').addEventListener('click', () => {
if (currentPage <= 1) {
return;
}
currentPage--;
renderPage(doc, currentPage);
});
document.getElementById('next').addEventListener('click', () => {
if (currentPage >= doc.numPages) {
return;
}
currentPage++;
renderPage(doc, currentPage);
});
renderPage(doc, currentPage);
}
async function renderPage(doc, pageNum) {
document.getElementById('page_num').innerText = pageNum;
let page = await doc.getPage(pageNum);
let viewport = page.getViewport({ scale: 1 });
let canvas = document.getElementById('container');
canvas.width = viewport.width;
canvas.height = viewport.height;
let renderContext = {
canvasContext: canvas.getContext('2d'),
viewport: viewport
};
await page.render(renderContext).promise;
document.getElementById('toolbar-loading').style.display = 'none';
document.getElementById('toolbar-content').style.display = '';
document.getElementById('container').style.display = '';
document.getElementById('author').style.display = '';
}
function ready() {
// Dart is fully loaded
let pdf = buildPdf();
displayPdf(pdf);
};
</script>
</head>
<body>
<div class="toolbar">
<div id="toolbar-loading">Loading ...</div>
<div id="toolbar-content" style="display:none;">
<button id="prev">Previous</button>
<button id="next">Next</button>
<span>Page: <span id="page_num"></span> / <span id="page_count"></span></span>
<span id="title"></span>
</div>
</div>
<canvas id="container" style="display:none;"></canvas>
<div id="author" style="display:none;"></div>
</body>
</html>