| 1 |
/** |
| 2 |
* Easy Invoice Document PDF Generation using html2canvas |
| 3 |
* Generates PDF from the actual rendered invoice/quote HTML |
| 4 |
* |
| 5 |
* @package Easy_Invoice |
| 6 |
* @version 1.0.0 |
| 7 |
*/ |
| 8 |
|
| 9 |
(function() { |
| 10 |
'use strict'; |
| 11 |
|
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/** ISO 216 A4 (portrait) — explicit mm so PDF page size is always A4 in viewers. */ |
| 13 |
const A4_MM = { width: 210, height: 297 }; |
| 14 |
|
| 15 |
// Global Document PDF Generator Class |
| 16 |
window.DocumentPdfGenerator = class DocumentPdfGenerator { |
| 17 |
constructor(documentType = 'invoice') { |
| 18 |
this.documentType = documentType; // 'invoice' or 'quote' |
| 19 |
this.init(); |
| 20 |
} |
| 21 |
|
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init() { |
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// Add html2canvas script if not already loaded |
| 24 |
if (typeof html2canvas === 'undefined') { |
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this.loadScript('https://cdnjs.cloudflare.com/ajax/libs/html2canvas/1.4.1/html2canvas.min.js', () => { |
| 26 |
this.loadScript('https://cdnjs.cloudflare.com/ajax/libs/jspdf/2.5.1/jspdf.umd.min.js', () => { |
| 27 |
this.setupPDFButtons(); |
| 28 |
}); |
| 29 |
}); |
| 30 |
} else { |
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this.setupPDFButtons(); |
| 32 |
} |
| 33 |
} |
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|
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loadScript(src, callback) { |
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const script = document.createElement('script'); |
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script.src = src; |
| 38 |
script.onload = callback; |
| 39 |
document.head.appendChild(script); |
| 40 |
} |
| 41 |
|
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setupPDFButtons() { |
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// Find all PDF download buttons |
| 44 |
const pdfButtons = document.querySelectorAll('.download-pdf-btn, .ei-download-pdf'); |
| 45 |
|
| 46 |
pdfButtons.forEach(button => { |
| 47 |
button.addEventListener('click', (e) => { |
| 48 |
e.preventDefault(); |
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this.generatePDF(); |
| 50 |
}); |
| 51 |
}); |
| 52 |
} |
| 53 |
|
| 54 |
/** |
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* Max canvas edge length (px) — browsers cap canvas size; long invoices exceed this in one shot. |
| 56 |
*/ |
| 57 |
static get MAX_CANVAS_EDGE() { |
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return 10000; |
| 59 |
} |
| 60 |
|
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/** |
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* Vertical slice height (CSS px) per html2canvas capture when content is very tall. |
| 63 |
*/ |
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static get SLICE_HEIGHT_CSS() { |
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return 3200; |
| 66 |
} |
| 67 |
|
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/** |
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* @returns {{width:number,height:number}} A4 size in mm (portrait). |
| 70 |
*/ |
| 71 |
static getA4SizeMm() { |
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return { width: A4_MM.width, height: A4_MM.height }; |
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} |
| 74 |
|
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/** |
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* Append an A4 portrait page (matches initial document format). |
| 77 |
* |
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* @param {Object} pdf jsPDF instance |
| 79 |
*/ |
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static addA4Page(pdf) { |
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pdf.addPage('a4', 'p'); |
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} |
| 83 |
|
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/** |
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* Padding-top + border-top of the invoice/quote root (CSS px), matching visible HTML inset. |
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* |
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* @param {HTMLElement} el |
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* @returns {number} |
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*/ |
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getContentPaddingTopPx(el) { |
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const s = window.getComputedStyle(el); |
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return (parseFloat(s.paddingTop) || 0) + (parseFloat(s.borderTopWidth) || 0); |
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} |
| 94 |
|
| 95 |
/** |
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* Collect bottom Y positions (px from top of root) for table rows and summary blocks |
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* so PDF page breaks avoid cutting through a line item row. |
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* |
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* @param {HTMLElement} root |
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* @returns {number[]} Sorted unique pixel positions (content-relative, 0 .. scrollHeight) |
| 101 |
*/ |
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collectRowBottomsPx(root) { |
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const rr = root.getBoundingClientRect(); |
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const bottoms = []; |
| 105 |
|
| 106 |
const addEl = (el) => { |
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if (!el || !el.getBoundingClientRect) { |
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return; |
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} |
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const r = el.getBoundingClientRect(); |
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const bottom = r.bottom - rr.top + root.scrollTop; |
| 112 |
if (bottom > 0) { |
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bottoms.push(bottom); |
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} |
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}; |
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|
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root.querySelectorAll('table tbody > tr').forEach(addEl); |
| 118 |
|
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root.querySelectorAll( |
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'.invoice-summary, .quote-summary, [class*="invoice-summary"], [class*="quote-summary"]' |
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).forEach(addEl); |
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|
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const sorted = [...new Set(bottoms)].sort((a, b) => a - b); |
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return sorted; |
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} |
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|
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/** |
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* Build non-overlapping vertical slices [start,end) in px that stay under maxChunkPx |
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* and end on the nearest row bottom when possible (avoids slicing mid-row in html2canvas). |
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* |
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* @param {number} totalHeightPx |
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* @param {number[]} rowBottomsPx |
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* @param {number} maxChunkPx |
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* @returns {Array<{start:number,end:number}>} |
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*/ |
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buildRowAlignedSlices(totalHeightPx, rowBottomsPx, maxChunkPx) { |
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const slices = []; |
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let start = 0; |
| 139 |
while (start < totalHeightPx) { |
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let end = Math.min(start + maxChunkPx, totalHeightPx); |
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const backs = rowBottomsPx.filter((b) => b > start && b <= end); |
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if (backs.length) { |
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end = Math.max(...backs); |
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} |
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if (end <= start) { |
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end = Math.min(start + maxChunkPx, totalHeightPx); |
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} |
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slices.push({ start, end }); |
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start = end; |
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} |
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return slices; |
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} |
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|
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/** |
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* Row / block bottoms within a vertical slice, expressed in mm from the top of that slice's image. |
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* |
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* @param {number[]} rowBottomsPx |
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* @param {number} sliceStartPx |
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* @param {number} sliceEndPx |
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* @param {number} sliceHeightPx |
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* @param {number} imgHeightMm |
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* @returns {number[]} |
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*/ |
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breakPointsMmForSlice(rowBottomsPx, sliceStartPx, sliceEndPx, sliceHeightPx, imgHeightMm) { |
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const pts = rowBottomsPx |
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.filter((b) => b > sliceStartPx && b <= sliceEndPx) |
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.map((b) => ((b - sliceStartPx) / sliceHeightPx) * imgHeightMm); |
| 168 |
if (imgHeightMm > 0) { |
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pts.push(imgHeightMm); |
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} |
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return [...new Set(pts)].sort((a, b) => a - b); |
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} |
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|
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/** |
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* Compute html2canvas scale so width/height stay under browser canvas limits. |
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* |
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* @param {HTMLElement} el |
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* @param {number} baseScale |
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* @returns {number} |
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*/ |
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computeSafeScale(el, baseScale) { |
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const w = Math.max(1, el.scrollWidth); |
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const h = Math.max(1, el.scrollHeight); |
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const maxEdge = this.constructor.MAX_CANVAS_EDGE; |
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const maxScale = Math.min(maxEdge / w, maxEdge / h, baseScale); |
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return Math.max(0.2, Math.min(baseScale, maxScale)); |
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} |
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|
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/** |
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* Capture one vertical slice of an element (for very long content). |
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* |
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* @param {HTMLElement} element |
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* @param {number} offsetY |
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* @param {number} sliceHeight |
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* @param {number} scale |
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* @returns {Promise<HTMLCanvasElement>} |
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*/ |
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captureSlice(element, offsetY, sliceHeight, scale) { |
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// Lock the capture viewport to the element's own layout width so |
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// responsive CSS doesn't kick in and shrink columns mid-capture. |
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const lockedWidth = Math.max(1, element.scrollWidth); |
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return html2canvas(element, { |
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scale, |
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useCORS: true, |
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allowTaint: true, |
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backgroundColor: '#ffffff', |
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logging: false, |
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imageTimeout: 15000, |
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windowWidth: lockedWidth, |
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width: lockedWidth, |
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onclone: (_doc, clone) => { |
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const node = clone; |
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node.style.overflow = 'hidden'; |
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node.style.boxSizing = 'border-box'; |
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node.style.marginTop = -offsetY + 'px'; |
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node.style.height = sliceHeight + 'px'; |
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} |
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}); |
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} |
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|
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/** |
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* Append canvas to PDF with row-aware vertical crops. |
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* Continuation pages (not at document top) get the same top inset as the HTML root padding — no extra mm margin. |
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* |
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* @param {jsPDF} pdf |
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* @param {HTMLCanvasElement} canvas |
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* @param {number} pageWidthMm |
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* @param {number} pageHeightMm |
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* @param {number[]} breakPointsMm |
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* @param {boolean} prependPage Start this block on a new PDF page (multi-slice continuation). |
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* @param {number} fragmentTopPx Y offset of this bitmap’s top within documentContent (0 = full capture). |
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* @param {number} fragmentHeightPx Layout height (px) this bitmap represents (scrollHeight or slice height). |
| 233 |
* @param {number} padTopCssPx padding-top + border-top of documentContent (CSS px). |
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* @param {number} scale html2canvas scale factor. |
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*/ |
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addImagePagesRowAware( |
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pdf, |
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canvas, |
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pageWidthMm, |
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pageHeightMm, |
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breakPointsMm, |
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prependPage, |
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fragmentTopPx, |
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fragmentHeightPx, |
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padTopCssPx, |
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scale |
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) { |
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const imgHeightMm = (canvas.height * pageWidthMm) / canvas.width; |
| 249 |
const fullBreaks = [...new Set([0, ...breakPointsMm.filter((b) => b > 0 && b <= imgHeightMm), imgHeightMm])] |
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.filter((v, i, a) => i === 0 || v > a[i - 1] + 0.0001) |
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.sort((a, b) => a - b); |
| 252 |
|
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if (prependPage) { |
| 254 |
this.constructor.addA4Page(pdf); |
| 255 |
} |
| 256 |
|
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let y0mm = 0; |
| 258 |
let firstCrop = true; |
| 259 |
|
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while (y0mm < imgHeightMm - 0.0001) { |
| 261 |
const limit = y0mm + pageHeightMm; |
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const inRange = fullBreaks.filter((b) => b > y0mm && b <= limit); |
| 263 |
let y1mm; |
| 264 |
if (inRange.length) { |
| 265 |
y1mm = Math.max(...inRange); |
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} else { |
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const nextB = fullBreaks.find((b) => b > y0mm); |
| 268 |
if (nextB !== undefined && nextB - y0mm <= pageHeightMm) { |
| 269 |
y1mm = nextB; |
| 270 |
} else { |
| 271 |
y1mm = Math.min(limit, imgHeightMm); |
| 272 |
} |
| 273 |
} |
| 274 |
if (y1mm <= y0mm) { |
| 275 |
y1mm = Math.min(y0mm + pageHeightMm, imgHeightMm); |
| 276 |
} |
| 277 |
|
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const py0 = (y0mm / imgHeightMm) * canvas.height; |
| 279 |
const py1 = (y1mm / imgHeightMm) * canvas.height; |
| 280 |
const ch = Math.max(1, Math.round(py1 - py0)); |
| 281 |
|
| 282 |
const crop = document.createElement('canvas'); |
| 283 |
crop.width = canvas.width; |
| 284 |
crop.height = ch; |
| 285 |
const ctx = crop.getContext('2d'); |
| 286 |
ctx.drawImage(canvas, 0, py0, canvas.width, ch, 0, 0, canvas.width, ch); |
| 287 |
|
| 288 |
/** Document Y (px) at top of this strip; > 0 means below HTML padding — match that inset. */ |
| 289 |
const docYTop = fragmentTopPx + (py0 / canvas.height) * fragmentHeightPx; |
| 290 |
const padTopCanvasPx = |
| 291 |
docYTop > 0.5 && padTopCssPx > 0 ? Math.round(padTopCssPx * scale) : 0; |
| 292 |
|
| 293 |
let outCanvas = crop; |
| 294 |
if (padTopCanvasPx > 0) { |
| 295 |
const padded = document.createElement('canvas'); |
| 296 |
padded.width = crop.width; |
| 297 |
padded.height = ch + padTopCanvasPx; |
| 298 |
const pctx = padded.getContext('2d'); |
| 299 |
pctx.fillStyle = '#ffffff'; |
| 300 |
pctx.fillRect(0, 0, padded.width, padded.height); |
| 301 |
pctx.drawImage(crop, 0, padTopCanvasPx); |
| 302 |
outCanvas = padded; |
| 303 |
} |
| 304 |
|
| 305 |
// PNG is lossless — invoices are mostly text + tables, where |
| 306 |
// JPEG produces fuzzy edges and colour-fringe around glyphs. |
| 307 |
// The 'SLOW' compression flag tells jsPDF to use the better |
| 308 |
// (slower) inflate algorithm so the embedded bitmap retains |
| 309 |
// its full resolution. |
| 310 |
const cropData = outCanvas.toDataURL('image/png'); |
| 311 |
const segMm = (outCanvas.height * pageWidthMm) / outCanvas.width; |
| 312 |
|
| 313 |
if (!firstCrop) { |
| 314 |
this.constructor.addA4Page(pdf); |
| 315 |
} |
| 316 |
firstCrop = false; |
| 317 |
pdf.addImage(cropData, 'PNG', 0, 0, pageWidthMm, segMm, undefined, 'SLOW'); |
| 318 |
|
| 319 |
y0mm = y1mm; |
| 320 |
} |
| 321 |
} |
| 322 |
|
| 323 |
async generatePDF() { |
| 324 |
try { |
| 325 |
// Show loading state |
| 326 |
this.showLoading(); |
| 327 |
|
| 328 |
// Find the document content |
| 329 |
const documentContent = document.querySelector('.invoice-content') || |
| 330 |
document.querySelector('.quote-content') || |
| 331 |
document.querySelector('.receipt-container'); |
| 332 |
|
| 333 |
if (!documentContent) { |
| 334 |
throw new Error('Document content not found'); |
| 335 |
} |
| 336 |
|
| 337 |
// Get document data for filename |
| 338 |
const documentTitle = document.querySelector('.invoice-title')?.textContent || |
| 339 |
document.querySelector('.quote-title')?.textContent || |
| 340 |
document.querySelector('.receipt-title')?.textContent || |
| 341 |
this.documentType; |
| 342 |
const documentNumber = document.querySelector('.invoice-number')?.textContent || |
| 343 |
document.querySelector('.quote-number')?.textContent || |
| 344 |
document.querySelector('.receipt-number')?.textContent || |
| 345 |
''; |
| 346 |
const filename = `${documentTitle}-${documentNumber}-${new Date().toISOString().split('T')[0]}.pdf`; |
| 347 |
|
| 348 |
const jsPDF = window.jsPDF || window.jspdf?.jsPDF; |
| 349 |
if (!jsPDF) { |
| 350 |
throw new Error('jsPDF library not available'); |
| 351 |
} |
| 352 |
|
| 353 |
const a4 = this.constructor.getA4SizeMm(); |
| 354 |
const pdf = new jsPDF({ |
| 355 |
orientation: 'p', |
| 356 |
unit: 'mm', |
| 357 |
format: 'a4', |
| 358 |
// FlateDecode-compress the embedded bitmaps so a high-resolution |
| 359 |
// capture doesn't bloat the file to 20MB. |
| 360 |
compress: true, |
| 361 |
precision: 4 |
| 362 |
}); |
| 363 |
const pageWidthMm = a4.width; |
| 364 |
const pageHeightMm = a4.height; |
| 365 |
const imgWidthMm = pageWidthMm; |
| 366 |
|
| 367 |
// 2× the CSS pixel grid — matches retina display density, so text |
| 368 |
// edges stay crisp instead of soft. (Previous 1.5× produced the |
| 369 |
// "PDF quality is bad" customer report.) |
| 370 |
const baseScale = 2; |
| 371 |
const totalHeight = documentContent.scrollHeight; |
| 372 |
const totalWidth = documentContent.scrollWidth; |
| 373 |
const maxSingleCanvasPx = this.constructor.MAX_CANVAS_EDGE; |
| 374 |
const needsSlices = |
| 375 |
totalHeight * baseScale > maxSingleCanvasPx || |
| 376 |
totalWidth * baseScale > maxSingleCanvasPx; |
| 377 |
|
| 378 |
const rowBottomsPx = this.collectRowBottomsPx(documentContent); |
| 379 |
const padTopCssPx = this.getContentPaddingTopPx(documentContent); |
| 380 |
|
| 381 |
if (!needsSlices) { |
| 382 |
const scale = this.computeSafeScale(documentContent, baseScale); |
| 383 |
// Lock the capture viewport to the element's own layout width |
| 384 |
// so responsive media queries don't shrink the design mid-capture. |
| 385 |
const lockedWidth = Math.max(1, documentContent.scrollWidth); |
| 386 |
const canvas = await html2canvas(documentContent, { |
| 387 |
scale, |
| 388 |
useCORS: true, |
| 389 |
allowTaint: true, |
| 390 |
backgroundColor: '#ffffff', |
| 391 |
logging: false, |
| 392 |
imageTimeout: 15000, |
| 393 |
windowWidth: lockedWidth, |
| 394 |
width: lockedWidth |
| 395 |
}); |
| 396 |
const imgHeightMm = (canvas.height * imgWidthMm) / canvas.width; |
| 397 |
const breakMm = this.breakPointsMmForSlice( |
| 398 |
rowBottomsPx, |
| 399 |
0, |
| 400 |
totalHeight, |
| 401 |
totalHeight, |
| 402 |
imgHeightMm |
| 403 |
); |
| 404 |
this.addImagePagesRowAware( |
| 405 |
pdf, |
| 406 |
canvas, |
| 407 |
imgWidthMm, |
| 408 |
pageHeightMm, |
| 409 |
breakMm, |
| 410 |
false, |
| 411 |
0, |
| 412 |
totalHeight, |
| 413 |
padTopCssPx, |
| 414 |
scale |
| 415 |
); |
| 416 |
} else { |
| 417 |
const sliceCss = this.constructor.SLICE_HEIGHT_CSS; |
| 418 |
let scale = this.computeSafeScale(documentContent, baseScale); |
| 419 |
scale = Math.min(scale, maxSingleCanvasPx / sliceCss); |
| 420 |
scale = Math.max(0.2, scale); |
| 421 |
|
| 422 |
const slices = this.buildRowAlignedSlices(totalHeight, rowBottomsPx, sliceCss); |
| 423 |
|
| 424 |
for (let i = 0; i < slices.length; i++) { |
| 425 |
const { start, end } = slices[i]; |
| 426 |
const sliceH = end - start; |
| 427 |
const canvas = await this.captureSlice(documentContent, start, sliceH, scale); |
| 428 |
const imgHeightMm = (canvas.height * imgWidthMm) / canvas.width; |
| 429 |
const breakMm = this.breakPointsMmForSlice( |
| 430 |
rowBottomsPx, |
| 431 |
start, |
| 432 |
end, |
| 433 |
sliceH, |
| 434 |
imgHeightMm |
| 435 |
); |
| 436 |
this.addImagePagesRowAware( |
| 437 |
pdf, |
| 438 |
canvas, |
| 439 |
imgWidthMm, |
| 440 |
pageHeightMm, |
| 441 |
breakMm, |
| 442 |
i > 0, |
| 443 |
start, |
| 444 |
sliceH, |
| 445 |
padTopCssPx, |
| 446 |
scale |
| 447 |
); |
| 448 |
} |
| 449 |
} |
| 450 |
|
| 451 |
// Download the PDF |
| 452 |
pdf.save(filename); |
| 453 |
|
| 454 |
// Hide loading state |
| 455 |
this.hideLoading(); |
| 456 |
|
| 457 |
} catch (error) { |
| 458 |
console.error('PDF generation failed:', error); |
| 459 |
this.hideLoading(); |
| 460 |
|
| 461 |
// Show error message |
| 462 |
if (typeof EasyInvoiceToast !== 'undefined') { |
| 463 |
EasyInvoiceToast.show('error', 'Failed to generate PDF. Please try again.'); |
| 464 |
} else if (typeof showMessage !== 'undefined') { |
| 465 |
showMessage('Failed to generate PDF. Please try again.', 'error'); |
| 466 |
} else { |
| 467 |
alert('Failed to generate PDF. Please try again.'); |
| 468 |
} |
| 469 |
} |
| 470 |
} |
| 471 |
|
| 472 |
showLoading() { |
| 473 |
// Create loading overlay |
| 474 |
const overlay = document.createElement('div'); |
| 475 |
overlay.id = 'pdf-loading-overlay'; |
| 476 |
overlay.style.cssText = ` |
| 477 |
position: fixed; |
| 478 |
top: 0; |
| 479 |
left: 0; |
| 480 |
width: 100%; |
| 481 |
height: 100%; |
| 482 |
background: rgba(0, 0, 0, 0.5); |
| 483 |
display: flex; |
| 484 |
justify-content: center; |
| 485 |
align-items: center; |
| 486 |
z-index: 9999; |
| 487 |
`; |
| 488 |
|
| 489 |
const spinner = document.createElement('div'); |
| 490 |
spinner.style.cssText = ` |
| 491 |
background: white; |
| 492 |
padding: 20px; |
| 493 |
border-radius: 8px; |
| 494 |
box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15); |
| 495 |
text-align: center; |
| 496 |
`; |
| 497 |
|
| 498 |
spinner.innerHTML = ` |
| 499 |
<div style="margin-bottom: 10px;"> |
| 500 |
<svg width="40" height="40" viewBox="0 0 40 40"> |
| 501 |
<circle cx="20" cy="20" r="18" stroke="#e3e3e3" stroke-width="4" fill="none"/> |
| 502 |
<circle cx="20" cy="20" r="18" stroke="#007cba" stroke-width="4" fill="none" |
| 503 |
stroke-dasharray="113" stroke-dashoffset="113" |
| 504 |
style="animation: spin 1s linear infinite; transform-origin: 50% 50%;"> |
| 505 |
<animate attributeName="stroke-dashoffset" values="113;0" dur="1s" repeatCount="indefinite"/> |
| 506 |
</circle> |
| 507 |
</svg> |
| 508 |
</div> |
| 509 |
<div style="color: #333; font-weight: 500;">Generating PDF...</div> |
| 510 |
`; |
| 511 |
|
| 512 |
overlay.appendChild(spinner); |
| 513 |
document.body.appendChild(overlay); |
| 514 |
|
| 515 |
// Add CSS animation |
| 516 |
const style = document.createElement('style'); |
| 517 |
style.textContent = ` |
| 518 |
@keyframes spin { |
| 519 |
0% { stroke-dashoffset: 113; } |
| 520 |
100% { stroke-dashoffset: 0; } |
| 521 |
} |
| 522 |
`; |
| 523 |
document.head.appendChild(style); |
| 524 |
} |
| 525 |
|
| 526 |
hideLoading() { |
| 527 |
const overlay = document.getElementById('pdf-loading-overlay'); |
| 528 |
if (overlay) { |
| 529 |
overlay.remove(); |
| 530 |
} |
| 531 |
} |
| 532 |
}; |
| 533 |
|
| 534 |
// Backward compatibility - keep InvoicePdfGenerator for existing code |
| 535 |
window.InvoicePdfGenerator = window.DocumentPdfGenerator; |
| 536 |
|
| 537 |
// Initialize when DOM is ready |
| 538 |
if (document.readyState === 'loading') { |
| 539 |
document.addEventListener('DOMContentLoaded', () => { |
| 540 |
// Auto-detect document type based on page content |
| 541 |
const isQuote = document.querySelector('.quote-content, .quote-title, .quote-number'); |
| 542 |
const documentType = isQuote ? 'quote' : 'invoice'; |
| 543 |
new DocumentPdfGenerator(documentType); |
| 544 |
}); |
| 545 |
} else { |
| 546 |
// Auto-detect document type based on page content |
| 547 |
const isQuote = document.querySelector('.quote-content, .quote-title, .quote-number'); |
| 548 |
const documentType = isQuote ? 'quote' : 'invoice'; |
| 549 |
new DocumentPdfGenerator(documentType); |
| 550 |
} |
| 551 |
|
| 552 |
})(); |
| 553 |
|
