<script type="text/javascript" src= '/js/pdf.js'></script> <style> #the-canvas { border: 1px solid black; direction: ltr; width: 100%; height: auto; display: none; } #paginator { display: none; text-align: center; margin-bottom: 10px; } #loadingWrapper { display: none; justify-content: center; align-items: center; width: 100%; height: 350px; } #loading { display: inline-block; width: 50px; height: 50px; border: 3px solid #d2d0d0;; border-radius: 50%; border-top-color: #383838; animation: spin 1s ease-in-out infinite; -webkit-animation: spin 1s ease-in-out infinite; } @keyframes spin { to { -webkit-transform: rotate(360deg); } } @-webkit-keyframes spin { to { -webkit-transform: rotate(360deg); } } </style> <div id="paginator"> <button id="prev">Previous</button> <button id="next">Next</button> <span>Page: <span id="page_num"></span> / <span id="page_count"></span></span> </div> <div id="embed-pdf-container"> <div id="loadingWrapper"> <div id="loading"></div> </div> <canvas id="the-canvas"></canvas> </div> <script type="text/javascript"> window.onload = function() { // If absolute URL from the remote server is provided, configure the CORS // header on that server. var url = "{{.Site.BaseURL}}" + '{{ .Get "url" }}'; var hidePaginator = "{{ .Get "hidePaginator" }}" === "true"; var hideLoader = "{{ .Get "hideLoader" }}" === "true"; var selectedPageNum = parseInt("{{ .Get "renderPageNum" }}") || 1; // 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 = "{{.Site.BaseURL}}" + '/js/pdf.worker.js'; // Change the Scale value for lower or higher resolution. var pdfDoc = null, pageNum = selectedPageNum, pageRendering = false, pageNumPending = null, scale = 3, canvas = document.getElementById('the-canvas'), ctx = canvas.getContext('2d'), paginator = document.getElementById("paginator"), loadingWrapper = document.getElementById('loadingWrapper'); // Attempt to show paginator and loader if enabled showPaginator(); showLoader(); /** * Get page info from document, resize canvas accordingly, and render page. * @param num Page number. */ function renderPage(num) { pageRendering = true; // Using promise to fetch the page pdfDoc.getPage(num).then(function(page) { var viewport = page.getViewport({scale: scale}); canvas.height = viewport.height; canvas.width = viewport.width; // Render PDF page into canvas context var renderContext = { canvasContext: ctx, viewport: viewport }; var renderTask = page.render(renderContext); // Wait for rendering to finish renderTask.promise.then(function() { pageRendering = false; showContent(); if (pageNumPending !== null) { // New page rendering is pending renderPage(pageNumPending); pageNumPending = null; } }); }); // Update page counters document.getElementById('page_num').textContent = num; } /** * Hides loader and shows canvas */ function showContent() { loadingWrapper.style.display = 'none'; canvas.style.display = 'block'; } /** * If we haven't disabled the loader, show loader and hide canvas */ function showLoader() { if(hideLoader) return loadingWrapper.style.display = 'flex'; canvas.style.display = 'none'; } /** * If we haven't disabled the paginator, show paginator */ function showPaginator() { if(hidePaginator) return paginator.style.display = 'block'; } /** * If another page rendering in progress, waits until the rendering is * finished. Otherwise, executes rendering immediately. */ function queueRenderPage(num) { if (pageRendering) { pageNumPending = num; } else { renderPage(num); } } /** * Displays previous page. */ function onPrevPage() { if (pageNum <= 1) { return; } pageNum--; queueRenderPage(pageNum); } document.getElementById('prev').addEventListener('click', onPrevPage); /** * Displays next page. */ function onNextPage() { if (pageNum >= pdfDoc.numPages) { return; } pageNum++; queueRenderPage(pageNum); } document.getElementById('next').addEventListener('click', onNextPage); /** * Asynchronously downloads PDF. */ pdfjsLib.getDocument(url).promise.then(function(pdfDoc_) { pdfDoc = pdfDoc_; var numPages = pdfDoc.numPages; document.getElementById('page_count').textContent = numPages; // If the user passed in a number that is out of range, render the last page. if(pageNum > numPages) { pageNum = numPages } // Initial/first page rendering renderPage(pageNum); }); } </script>