download-pdf.html
1.9 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
<html>
<head>
<script src="/dist/tesseract.dev.js"></script>
</head>
<body>
<div>
<input type="file" id="uploader">
<button id="download-pdf" disabled="true">Download PDF</button>
</div>
<textarea id="board" readonly rows="8" cols="80">Upload an image file</textarea>
<script>
const { createWorker } = Tesseract;
const worker = createWorker({
corePath: '/node_modules/tesseract.js-core/tesseract-core.wasm.js',
logger: m => console.log(m),
});
const uploader = document.getElementById('uploader');
const dlBtn = document.getElementById('download-pdf');
const recognize = async ({ target: { files } }) => {
await worker.load();
await worker.loadLanguage('eng');
await worker.initialize('eng');
const { data: { text } } = await worker.recognize(files[0]);
const board = document.getElementById('board');
board.value = text;
dlBtn.disabled = false;
};
const downloadPDF = async () => {
const filename = 'tesseract-ocr-result.pdf';
const { data } = await worker.getPDF('Tesseract OCR Result');
const blob = new Blob([new Uint8Array(data)], { type: 'application/pdf' });
if (navigator.msSaveBlob) {
// IE 10+
navigator.msSaveBlob(blob, filename);
} else {
const link = document.createElement('a');
if (link.download !== undefined) {
const url = URL.createObjectURL(blob);
link.setAttribute('href', url);
link.setAttribute('download', filename);
link.style.visibility = 'hidden';
document.body.appendChild(link);
link.click();
document.body.removeChild(link);
}
}
};
uploader.addEventListener('change', recognize);
dlBtn.addEventListener('click', downloadPDF);
</script>
</body>
</html>