ethanyoo.com/layouts/shortcodes/embed-pdf.html

264 lines
7.3 KiB
HTML

{{- if not ($.Page.Scratch.Get "embed-pdf-count") -}}
<script type="text/javascript" src= '/js/pdf-js/build/pdf.js'></script>
<style>
#embed-pdf-container {
position: relative;
width: 100%;
height: auto;
min-height: 20vh;
/* overflow-y:scroll; */
}
.pdf-canvas {
border: 1px solid black;
direction: ltr;
width: 100%;
height: auto;
display: none;
}
#the-canvas {
border: 1px solid black;
direction: ltr;
width: 100%;
height: auto;
display: none;
}
.pdf-loadingWrapper {
display: none;
justify-content: center;
align-items: center;
width: 100%;
height: 350px;
}
.pdf-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;
}
{{/* Download link */}}
#overlayText {
word-wrap: break-word;
display: grid;
justify-content: end;
}
#overlayText a {
position: relative;
top: 10px;
right: 4px;
color: #000;
margin: auto;
background-color: #eeeeee;
padding: 0.3em 1em;
border: solid 2px;
border-radius: 12px;
border-color: #00000030;
text-decoration: none;
}
#overlayText svg {
height: clamp(1em, 2vw, 1.4em);
width: clamp(1em, 2vw, 1.4em);
}
@keyframes spin {
to { -webkit-transform: rotate(360deg); }
}
@-webkit-keyframes spin {
to { -webkit-transform: rotate(360deg); }
}
</style>
{{- end -}}
{{- $.Page.Scratch.Add "embed-pdf-count" 1 -}}
<div class="embed-pdf-container" id="embed-pdf-container-{{ substr (.Get "url" | md5) 0 8 }}">
<div class="pdf-loadingWrapper" id="pdf-loadingWrapper-{{ substr (.Get "url" | md5) 0 8 }}">
<div class="pdf-loading" id="pdf-loading-{{ substr (.Get "url" | md5) 0 8 }}"></div>
</div>
<div id="overlayText">
<a href="{{ .Get "url" }}" aria-label="Download" download>
<svg aria-hidden="true" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 18 18">
<path d="M9 13c.3 0 .5-.1.7-.3L15.4 7 14 5.6l-4 4V1H8v8.6l-4-4L2.6 7l5.7 5.7c.2.2.4.3.7.3zm-7 2h14v2H2z" />
</svg>
</a>
</div>
<canvas class="pdf-canvas" id="pdf-canvas-{{ substr (.Get "url" | md5) 0 8 }}"></canvas>
</div>
<div class="pdf-paginator" id="pdf-paginator-{{ substr (.Get "url" | md5) 0 8 }}">
<button id="pdf-prev-{{ substr (.Get "url" | md5) 0 8 }}">Previous</button>
<button id="pdf-next-{{ substr (.Get "url" | md5) 0 8 }}">Next</button> &nbsp; &nbsp;
<span>
<span class="pdf-pagenum" id="pdf-pagenum-{{ substr (.Get "url" | md5) 0 8 }}"></span> / <span class="pdf-pagecount" id="pdf-pagecount-{{ substr (.Get "url" | md5) 0 8 }}"></span>
</span>
<a class="pdf-source" id="pdf-source-{{ substr (.Get "url" | md5) 0 8 }}" href="{{ .Get "url" }}">[pdf]</a>
</div>
<noscript>
View the PDF file <a class="pdf-source" id="pdf-source-noscript-{{ substr (.Get "url" | md5) 0 8 }}" href="{{ .Get "url" }}">here</a>.
</noscript>
<script type="text/javascript">
(function(){
var url = '{{ .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.
if (pdfjsLib.GlobalWorkerOptions.workerSrc == '')
pdfjsLib.GlobalWorkerOptions.workerSrc = "{{.Site.BaseURL}}" + 'js/pdf-js/build/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('pdf-canvas-{{ substr (.Get "url" | md5) 0 8 }}'),
ctx = canvas.getContext('2d'),
paginator = document.getElementById("pdf-paginator-{{ substr (.Get "url" | md5) 0 8 }}"),
loadingWrapper = document.getElementById('pdf-loadingWrapper-{{ substr (.Get "url" | md5) 0 8 }}');
// 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('pdf-pagenum-{{ substr (.Get "url" | md5) 0 8 }}').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('pdf-prev-{{ substr (.Get "url" | md5) 0 8 }}').addEventListener('click', onPrevPage);
/**
* Displays next page.
*/
function onNextPage() {
if (pageNum >= pdfDoc.numPages) {
return;
}
pageNum++;
queueRenderPage(pageNum);
}
document.getElementById('pdf-next-{{ substr (.Get "url" | md5) 0 8 }}').addEventListener('click', onNextPage);
/**
* Asynchronously downloads PDF.
*/
pdfjsLib.getDocument(url).promise.then(function(pdfDoc_) {
pdfDoc = pdfDoc_;
var numPages = pdfDoc.numPages;
document.getElementById('pdf-pagecount-{{ substr (.Get "url" | md5) 0 8 }}').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>