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August 9, 2012 02:16
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How to render a full PDF using Mozilla's pdf.js
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| <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> |
how to add zoom functionality in above mention code so that after zoom it stay on the same page?
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/pdfjs-dist@2.6.347/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>
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@WilsonYesidRiveraCasas don't use the unreleased/unstable version 2, please stick to version 1.x