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* Add Blogtrottr as newsletter provider * Fixed absLangURL issue with sections in footer * Added embed-pdf shortcode pdf-js is sered locally to preserve privacy and comply with GDPR Co-authored-by: Emruz Hossain <[email protected]>
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<!-- | ||
SPDX-License-Identifier: MIT | ||
This shortcut was originally taken from: https://github.com/anvithks/hugo-embed-pdf-shortcode, | ||
where it is available under the MIT License, where it was originally created by https://github.com/anvithks | ||
Since the project seems discontinued, it has been re-created here | ||
--> | ||
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<!-- Load the PDF-JS from the local folder (should be updated over time) --> | ||
<script src= '/js/pdf-js/build/pdf.js'></script> | ||
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<!-- Set the navigation menu --> | ||
<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> | ||
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<!-- And the canvas where the PDF will load --> | ||
<div id="embed-pdf-container"> | ||
<div id="loadingWrapper"> | ||
<div id="loading"></div> | ||
</div> | ||
<canvas id="the-canvas"></canvas> | ||
</div> | ||
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<!-- This script gets the PDF, sets it and passes it on to the already-loaded pdf-js --> | ||
<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 "src" }}'; | ||
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var hidePaginator = "{{ .Get "hidePaginator" }}" === "true"; | ||
var hideLoader = "{{ .Get "hideLoader" }}" === "true"; | ||
var selectedPageNum = parseInt("{{ .Get "renderPageNum" }}") || 1; | ||
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// Loaded via <script> tag, create shortcut to access PDF.js exports. | ||
var pdfjsLib = window['pdfjs-dist/build/pdf']; | ||
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// The workerSrc property shall be specified. | ||
pdfjsLib.GlobalWorkerOptions.workerSrc = "{{.Site.BaseURL}}" + '/js/pdf-js/build/pdf.worker.js'; | ||
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// 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'); | ||
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// Attempt to show paginator and loader if enabled | ||
showPaginator(); | ||
showLoader(); | ||
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/** | ||
* 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; | ||
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// Render PDF page into canvas context | ||
var renderContext = { | ||
canvasContext: ctx, | ||
viewport: viewport | ||
}; | ||
var renderTask = page.render(renderContext); | ||
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// Wait for rendering to finish | ||
renderTask.promise.then(function() { | ||
pageRendering = false; | ||
showContent(); | ||
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if (pageNumPending !== null) { | ||
// New page rendering is pending | ||
renderPage(pageNumPending); | ||
pageNumPending = null; | ||
} | ||
}); | ||
}); | ||
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// Update page counters | ||
document.getElementById('page_num').textContent = num; | ||
} | ||
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/** | ||
* Hides loader and shows canvas | ||
*/ | ||
function showContent() { | ||
loadingWrapper.style.display = 'none'; | ||
canvas.style.display = 'block'; | ||
} | ||
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/** | ||
* 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'; | ||
} | ||
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/** | ||
* If we haven't disabled the paginator, show paginator | ||
*/ | ||
function showPaginator() { | ||
if(hidePaginator) return | ||
paginator.style.display = 'block'; | ||
} | ||
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/** | ||
* 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); | ||
} | ||
} | ||
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/** | ||
* Displays previous page. | ||
*/ | ||
function onPrevPage() { | ||
if (pageNum <= 1) { | ||
return; | ||
} | ||
pageNum--; | ||
queueRenderPage(pageNum); | ||
} | ||
document.getElementById('prev').addEventListener('click', onPrevPage); | ||
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/** | ||
* Displays next page. | ||
*/ | ||
function onNextPage() { | ||
if (pageNum >= pdfDoc.numPages) { | ||
return; | ||
} | ||
pageNum++; | ||
queueRenderPage(pageNum); | ||
} | ||
document.getElementById('next').addEventListener('click', onNextPage); | ||
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/** | ||
* Asynchronously downloads PDF. | ||
*/ | ||
pdfjsLib.getDocument(url).promise.then(function(pdfDoc_) { | ||
pdfDoc = pdfDoc_; | ||
var numPages = pdfDoc.numPages; | ||
document.getElementById('page_count').textContent = numPages; | ||
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// If the user passed in a number that is out of range, render the last page. | ||
if(pageNum > numPages) { | ||
pageNum = numPages | ||
} | ||
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// Initial/first page rendering | ||
renderPage(pageNum); | ||
}); | ||
} | ||
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</script> | ||
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<!-- Finally, make the canvas more beautiful --> | ||
<style> | ||
#the-canvas { | ||
border: 1px solid black; | ||
direction: ltr; | ||
width: 100%; | ||
height: auto; | ||
display: none; | ||
} | ||
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#paginator { | ||
display: none; | ||
text-align: center; | ||
margin-bottom: 10px; | ||
} | ||
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#loadingWrapper { | ||
display: none; | ||
justify-content: center; | ||
align-items: center; | ||
width: 100%; | ||
height: 350px; | ||
} | ||
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#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; | ||
} | ||
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@keyframes spin { | ||
to { -webkit-transform: rotate(360deg); } | ||
} | ||
@-webkit-keyframes spin { | ||
to { -webkit-transform: rotate(360deg); } | ||
} | ||
</style> |
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Nice to see new features added. One thought...
This "pdf-js" bundle adds about 15MB+ to the generated site. It would be nice to provide the ability to disable the feature to keep sizes down if the feature is not desired.
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I agree @eishundo. Opened an issue to track this: #685