-
-
Save imolorhe/f8794d3bb55e1a8065b23bcd0efeebe1 to your computer and use it in GitHub Desktop.
pdf to image using pdf.js
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| <html> | |
| <body> | |
| <script type="text/javascript" src="//mozilla.github.io/pdf.js/build/pdf.js"></script> | |
| <script type="text/javascript"> | |
| var url = "https://docs.google.com/document/export?format=pdf&id=1ML11ZyyMpnAr6clIAwWrXD53pQgNR-DppMYwt9XvE6s&token=AC4w5Vg7fSWH1Hq0SgNckx4YCvnGPaScyw%3A1423618416864"; | |
| var pages = [], heights = [], width = 0, height = 0, currentPage = 1; | |
| var scale = 1.5; | |
| function draw() { | |
| var canvas = document.createElement('canvas'), ctx = canvas.getContext('2d'); | |
| canvas.width = width; | |
| canvas.height = height; | |
| for(var i = 0; i < pages.length; i++) | |
| ctx.putImageData(pages[i], 0, heights[i]); | |
| document.body.appendChild(canvas); | |
| } | |
| PDFJS.disableWorker = true; // due to CORS | |
| PDFJS.getDocument(url).then(function (pdf) { | |
| getPage(); | |
| function getPage() { | |
| pdf.getPage(currentPage).then(function(page) { | |
| console.log("Printing " + currentPage); | |
| var viewport = page.getViewport(scale); | |
| var canvas = document.createElement('canvas') , ctx = canvas.getContext('2d'); | |
| var renderContext = { canvasContext: ctx, viewport: viewport }; | |
| canvas.height = viewport.height; | |
| canvas.width = viewport.width; | |
| page.render(renderContext).then(function() { | |
| pages.push(ctx.getImageData(0, 0, canvas.width, canvas.height)); | |
| heights.push(height); | |
| height += canvas.height; | |
| if (width < canvas.width) width = canvas.width; | |
| if (currentPage < pdf.numPages) { | |
| currentPage++; | |
| getPage(); | |
| } | |
| else { | |
| draw(); | |
| } | |
| }); | |
| }); | |
| } | |
| }); | |
| </script> | |
| </body> | |
| </html> |
microwavePC is right, code needs to be updated. Here's a fix for the newest pdfjs library 2.14.305:
var pages = [], heights = [], width = 0, height = 0, currentPage = 1;
var scale = 1.5;
function draw() {
var canvas = document.createElement('canvas'), ctx = canvas.getContext('2d');
canvas.width = width;
canvas.height = height;
for(var i = 0; i < pages.length; i++)
ctx.putImageData(pages[i], 0, heights[i]);
document.body.appendChild(canvas);
}
const thisdoc = pdfjsLib.getDocument(url);
thisdoc.promise.then(function (pdf) {
getPage();
function getPage() {
pdf.getPage(currentPage).then(function(page) {
console.log("Printing:" + currentPage);
var viewport = page.getViewport({scale});
var canvas = document.createElement('canvas') , ctx = canvas.getContext('2d');
var renderContext = { canvasContext: ctx, viewport: viewport };
canvas.height = viewport.height;
canvas.width = viewport.width;
const mypage = page.render(renderContext)
mypage.promise.then(function() {
pages.push(ctx.getImageData(0, 0, canvas.width, canvas.height));
heights.push(height);
height += canvas.height;
if (width < canvas.width) width = canvas.width;
if (currentPage < pdf.numPages) {
currentPage++;
getPage();
}
else {
draw();
}
});
});
}
});
The code doesn't work, I think it's missing something
Not working for me either
Here is a similar function I wrote for pdfs to base64 images. The function returns an array of images depending upon the pdf page length.
<script src="https://cdnjs.cloudflare.com/ajax/libs/pdf.js/3.11.174/pdf.min.js" integrity="sha512-q+4liFwdPC/bNdhUpZx6aXDx/h77yEQtn4I1slHydcbZK34nLaR3cAeYSJshoxIOq3mjEf7xJE8YWIUHMn+oCQ==" crossorigin="anonymous" referrerpolicy="no-referrer"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/pdf.js/3.11.174/pdf.worker.min.js" integrity="sha512-BbrZ76UNZq5BhH7LL7pn9A4TKQpQeNCHOo65/akfelcIBbcVvYWOFQKPXIrykE3qZxYjmDX573oa4Ywsc7rpTw==" crossorigin="anonymous" referrerpolicy="no-referrer"></script>export async function PDFtoIMG(url) {
return new Promise(async (resolve, reject) => {
const existingPdfBytes = await fetch(url).then(res => res.arrayBuffer())
const fileArray = new Uint8Array(existingPdfBytes);
const doc = await pdfjsLib.getDocument({
data: fileArray,
useSystemFonts: true,
}).promise
console.log('PDFtoIMG: url, doc', url, doc)
const pages = []
const count = 1
for (let i = 1; i < doc.numPages + 1; i++) {
const page = await doc.getPage(i)
const viewport = page.getViewport({scale: 1.5})
const canvas = document.createElement('canvas')
const ctx = canvas.getContext('2d')
canvas.width = viewport.width
canvas.height = viewport.height
const task = page.render({canvasContext: ctx, viewport: viewport})
task.promise.then( () => {
pages.push(canvas.toDataURL())
if (count == doc.numPages) {
resolve(pages)
}
})
}
})
}
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
This code is old, not working...
PDFJS -> pdfjsLib