Created
August 9, 2012 02:16
-
-
Save fcingolani/3300351 to your computer and use it in GitHub Desktop.
How to render a full PDF using Mozilla's 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> | |
| <!-- really dirty! this is just a test drive ;) --> | |
| <script type="text/javascript" src="https://raw.github.com/mozilla/pdf.js/gh-pages/build/pdf.js"></script> | |
| <script type="text/javascript"> | |
| function renderPDF(url, canvasContainer, options) { | |
| var options = options || { scale: 1 }; | |
| function renderPage(page) { | |
| var viewport = page.getViewport(options.scale); | |
| var canvas = document.createElement('canvas'); | |
| var ctx = canvas.getContext('2d'); | |
| var renderContext = { | |
| canvasContext: ctx, | |
| viewport: viewport | |
| }; | |
| canvas.height = viewport.height; | |
| canvas.width = viewport.width; | |
| canvasContainer.appendChild(canvas); | |
| page.render(renderContext); | |
| } | |
| function renderPages(pdfDoc) { | |
| for(var num = 1; num <= pdfDoc.numPages; num++) | |
| pdfDoc.getPage(num).then(renderPage); | |
| } | |
| PDFJS.disableWorker = true; | |
| PDFJS.getDocument(url).then(renderPages); | |
| } | |
| </script> | |
| <div id="holder"></div> | |
| <script type="text/javascript"> | |
| renderPDF('sample.pdf', document.getElementById('holder')); | |
| </script> | |
| </body> | |
| </html> |
is it possible to JUST render specific range or page o a pdf ? like... page 3 to page 6 ?
`
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <script src="pdf.js"></script> <script src="jquery.js"></script>PDF.js 'Hello, world!' example
<script> // If absolute URL from the remote server is provided, configure the CORS // header on that server. var url = 'pdff.pdf'; // Loaded via <script> tag, create shortcut to access PDF.js exports.
var pdfjsLib = window['pdfjs-dist/build/pdf'];
// The workerSrc property shall be specified.
pdfjsLib.GlobalWorkerOptions.workerSrc = 'worker.js';
var loadingTask = pdfjsLib.getDocument(url);
loadingTask.promise.then(function(pdf) {
var __TOTAL_PAGES = pdf.numPages;
// Fetch the first page
var pageNumber = 1;
for( let i=1; i<=__TOTAL_PAGES; i+=1){
var id ='the-canvas'+i;
$('#canvas_div').append("<div style='background-color:gray;text-align: center;padding:20px;' ><canvas calss='the-canvas' id='"+id+"'></canvas></div>");
var canvas = document.getElementById(id);
//var pageNumber = 1;
renderPage(canvas, pdf, pageNumber++, function pageRenderingComplete() {
if (pageNumber > pdf.numPages) {
return;
}
// Continue rendering of the next page
renderPage(canvas, pdf, pageNumber++, pageRenderingComplete);
});
}
});
function renderPage(canvas, pdf, pageNumber, callback) {
pdf.getPage(pageNumber).then(function(page) {
var scale = 1.5;
var viewport = page.getViewport({scale: scale});
var pageDisplayWidth = viewport.width;
var pageDisplayHeight = viewport.height;
//var pageDivHolder = document.createElement();
// Prepare canvas using PDF page dimensions
//var canvas = document.createElement(id);
var context = canvas.getContext('2d');
canvas.width = pageDisplayWidth;
canvas.height = pageDisplayHeight;
// pageDivHolder.appendChild(canvas);
// Render PDF page into canvas context
var renderContext = {
canvasContext: context,
viewport: viewport
};
page.render(renderContext).promise.then(callback);
});
}
</script>
<html>
`
doesn't work with the newest version, 2.6.347
It`s working now
<div id="my_canvas"></div>
<script src="https://cdn.jsdelivr.net/npm/[email protected]/build/pdf.min.js" />
<script>
function renderPDF(url, canvasContainer) {
function renderPage(page) {
let viewport = page.getViewport({scale: .5})
const DPI = 72;
const PRINT_OUTPUT_SCALE = DPI/72;
const scale = canvasContainer.clientWidth / viewport.width;
const canvas = document.createElement('canvas')
const ctx = canvas.getContext('2d')
viewport = page.getViewport({scale})
canvas.width = Math.floor(viewport.width * PRINT_OUTPUT_SCALE);
canvas.height = Math.floor(viewport.height * PRINT_OUTPUT_SCALE);
canvas.style.width = '100%';
canvas.style.transform = 'scale(1,1)';
canvas.style.transformOrigin = '0% 0%';
const canvasWrapper = document.createElement('div');
canvasWrapper.style.width = '100%';
canvasWrapper.style.height = '100%';
canvasWrapper.appendChild(canvas);
const renderContext = {
canvasContext: ctx,
viewport,
}
canvasContainer.appendChild(canvasWrapper)
page.render(renderContext)
}
function renderPages(pdfDoc) {
for (let num = 1; num <= pdfDoc.numPages; num += 1)
pdfDoc.getPage(num).then(renderPage)
}
pdfjsLib.disableWorker = true
pdfjsLib.getDocument(url).promise.then(renderPages)
}
renderPDF('../files/test.pdf', document.getElementById('my_canvas')) //div element
</script>
thanks @levenokk
Thank you @levenokk
how to add zoom functionality in above mention code so that after zoom it stay on the same page?
add html zoom
<div id="zoom_controls">
<button id="zoom_in">+</button>
<button id="zoom_out">-</button>
</div>
<script> document.getElementById('zoom_in').addEventListener('click', (e) => { if(options.scale < 4) { options.scale += 0.5; document.querySelector("#holder").style.zoom = options.scale; } }); document.getElementById('zoom_out').addEventListener('click', (e) => { if(options.scale > 1) { options.scale -= 0.5; document.querySelector("#holder").style.zoom = options.scale; } }); </script>
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
how to add zoom functionality in above mention code so that after zoom it stay on the same page?