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December 26, 2022 14:23
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loads all jpegs and makes a pdf with them
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| load = async (url) => { | |
| var head= document.getElementsByTagName('head')[0]; | |
| var script= document.createElement('script'); | |
| script.type= 'text/javascript'; | |
| script.src= url; | |
| return new Promise(resolve => { | |
| script.addEventListener('load', resolve); | |
| head.appendChild(script); | |
| }); | |
| } | |
| getDataUri = async (url) => { | |
| var image = new Image(); | |
| image.crossOrigin = "Anonymous"; | |
| return new Promise(resolve => { | |
| image.onload = function () { | |
| var canvas = document.createElement('canvas'); | |
| canvas.width = this.naturalWidth; // or 'width' if you want a special/scaled size | |
| canvas.height = this.naturalHeight; // or 'height' if you want a special/scaled size | |
| canvas.getContext('2d').drawImage(this, 0, 0); | |
| // ... or get as Data URI | |
| resolve(canvas.toDataURL('image/png')); | |
| }; | |
| image.src = url; | |
| }); | |
| } | |
| begin = async () => { | |
| console.log('Loading libraries') | |
| await Promise.all([ | |
| load('https://github.com/devongovett/blob-stream/releases/download/v0.1.3/blob-stream.js'), | |
| load('https://github.com/devongovett/pdfkit/releases/download/v0.8.0/pdfkit.js'), | |
| ]); | |
| console.log('Initing PDF') | |
| const doc = new PDFDocument({ | |
| size: 'a4', | |
| autoFirstPage: false, | |
| }); | |
| const stream = doc.pipe(blobStream()); | |
| stream.on('finish', () => { | |
| url = stream.toBlobURL('application/pdf'); | |
| window.open(url, "zhe book"); | |
| console.log('Popup should have opened now.'); | |
| }); | |
| const promises = []; | |
| const addImage = async (imgEl) => { | |
| const i = promises.length; | |
| await Promise.all(promises); | |
| if (imgEl && imgEl.src) { | |
| console.log('adding page', i); | |
| const uri = await getDataUri(imgEl.src); | |
| doc.addPage().image(uri, 0, 0, { | |
| fit: [600, 780], | |
| align: 'center', | |
| valign: 'center' | |
| }); | |
| } else { | |
| doc.addPage(); | |
| console.log('page empty', i) | |
| } | |
| }; | |
| let pageEls = document.querySelectorAll('.outer_page'); | |
| for (pageEl of pageEls) { | |
| const i = promises.length; | |
| console.log('loading page', i); | |
| pageEl.scrollIntoView(); | |
| let imgEl; | |
| const startT = Date.now(); | |
| while (!imgEl && (Date.now() - startT < 5000)) { | |
| await new Promise(r => setTimeout(r, 10)); | |
| imgEl = pageEl.querySelector('.absimg'); | |
| } | |
| promises.push(addImage(imgEl)); | |
| } | |
| console.log('waiting for page', promises.length); | |
| await Promise.all(promises); | |
| console.log('Making PDF'); | |
| doc.end(); | |
| } | |
| begin(); |
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