72 lines
1.7 KiB
JavaScript
72 lines
1.7 KiB
JavaScript
var pdfjsLib = window['pdfjs-dist/build/pdf'];
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function renderPage() {
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document.getElementById('pdfprogress').innerHTML = 'Идет подготовка страницы ...';
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pageRendering = true;
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// Using promise to fetch the page
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pdfDoc.getPage(pageNum).then(function(page, ) {
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var canvas = document.getElementById('the-canvas');
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var context = canvas.getContext('2d');
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var viewport = page.getViewport({scale: scale});
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canvas.height = viewport.height;
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canvas.width = viewport.width;
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// Render PDF page into canvas context
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var renderContext = {
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canvasContext: context,
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viewport: viewport
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};
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var renderTask = page.render(renderContext);
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// Wait for rendering to finish
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renderTask.promise.then(function() {
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pageRendering = false;
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if (pageNumPending !== null) {
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// New page rendering is pending
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renderPage(pageNumPending);
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pageNumPending = null;
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}
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});
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});
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document.getElementById('zoompdf').innerHTML = scale + 'x';
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document.getElementById('pdfprogress').innerHTML = 'Приятного чтения ↓';
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if (typeof prevlink !== 'undefined')
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document.getElementById('prevbutton').href = prevlink + '/'+ scale;
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if (typeof nextlink !== 'undefined')
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document.getElementById('nextbutton').href = nextlink + '/'+ scale;
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}
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function pdfzoomin(){
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scale += 0.25;
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renderPage();
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}
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function pdfzoomout(){
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scale -= 0.25;
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renderPage();
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}
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function startpdfviewer(){
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pdfjsLib.getDocument(url).promise.then(function(pdfDoc_) {
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pdfDoc = pdfDoc_;
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renderPage();
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});
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}
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