Merge pull request #568 from tiwariav/bugifx/order_pdf_resolution

bugfix/invoice_pdf_resolution
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Arvind Tiwari 2018-02-07 19:15:09 +05:30 committed by GitHub
commit 3049e84961
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4 changed files with 13 additions and 388 deletions

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/**
* @license
*
* MIT License
*
* Copyright (c) 2017 Erik Koopmans
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
/**
* Generate a PDF from an HTML element or string using html2canvas and jsPDF.
*
* @param {Element|string} source The source element or HTML string.
* @param {Object=} opt An object of optional settings: 'margin', 'filename',
* 'image' ('type' and 'quality'), and 'html2canvas' / 'jspdf', which are
* sent as settings to their corresponding functions.
*/
var html2pdf = (function(html2canvas, jsPDF) {
/* ---------- MAIN FUNCTION ---------- */
var html2pdf = function(source, opt) {
// Handle input.
opt = objType(opt) === 'object' ? opt : {};
var source = html2pdf.parseInput(source, opt);
// Determine the PDF page size.
var pageSize = jsPDF.getPageSize(opt.jsPDF);
pageSize.inner = {
width: pageSize.width - opt.margin[1] - opt.margin[3],
height: pageSize.height - opt.margin[0] - opt.margin[2]
};
pageSize.inner.ratio = pageSize.inner.height / pageSize.inner.width;
// Copy the source element into a PDF-styled container div.
var container = html2pdf.makeContainer(source, pageSize);
var overlay = container.parentElement;
// Get the locations of all hyperlinks.
if (opt.enableLinks) {
// Find all anchor tags and get the container's bounds for reference.
opt.links = [];
var links = container.querySelectorAll('a');
var containerRect = unitConvert(container.getBoundingClientRect(), pageSize.k);
// Treat each client rect as a separate link (for text-wrapping).
Array.prototype.forEach.call(links, function(link) {
var clientRects = link.getClientRects();
for (var i=0; i<clientRects.length; i++) {
var clientRect = unitConvert(clientRects[i], pageSize.k);
clientRect.left -= containerRect.left;
clientRect.top -= containerRect.top;
opt.links.push({ el: link, clientRect: clientRect });
}
});
}
// Render the canvas and pass the result to makePDF.
var onRendered = opt.html2canvas.onrendered || function() {};
opt.html2canvas.onrendered = function(canvas) {
onRendered(canvas);
document.body.removeChild(overlay);
html2pdf.makePDF(canvas, pageSize, opt);
}
html2canvas(container, opt.html2canvas);
};
html2pdf.parseInput = function(source, opt) {
// Parse the opt object.
opt.jsPDF = opt.jsPDF || {};
opt.html2canvas = opt.html2canvas || {};
opt.filename = opt.filename && objType(opt.filename) === 'string' ? opt.filename : 'file.pdf';
opt.enableLinks = opt.hasOwnProperty('enableLinks') ? opt.enableLinks : true;
opt.image = opt.image || {};
opt.image.type = opt.image.type || 'jpeg';
opt.image.quality = opt.image.quality || 0.95;
// Parse the margin property of the opt object.
switch (objType(opt.margin)) {
case 'undefined':
opt.margin = 0;
case 'number':
opt.margin = [opt.margin, opt.margin, opt.margin, opt.margin];
break;
case 'array':
if (opt.margin.length === 2) {
opt.margin = [opt.margin[0], opt.margin[1], opt.margin[0], opt.margin[1]];
}
if (opt.margin.length === 4) {
break;
}
default:
throw 'Invalid margin array.';
}
// Parse the source element/string.
if (!source) {
throw 'Missing source element or string.';
} else if (objType(source) === 'string') {
source = createElement('div', { innerHTML: source });
} else if (objType(source) === 'element') {
source = cloneNode(source, opt.html2canvas.javascriptEnabled);
} else {
throw 'Invalid source - please specify an HTML Element or string.';
}
// Return the parsed input (opt is modified in-place, no need to return).
return source;
};
html2pdf.makeContainer = function(source, pageSize) {
// Define the CSS styles for the container and its overlay parent.
var overlayCSS = {
position: 'fixed', overflow: 'hidden', zIndex: 1000,
left: 0, right: 0, bottom: 0, top: 0,
backgroundColor: 'rgba(0,0,0,0.8)'
};
var containerCSS = {
position: 'absolute', width: pageSize.inner.width + pageSize.unit,
left: 0, right: 0, top: 0, height: 'auto', margin: 'auto',
backgroundColor: 'white'
};
// Set the overlay to hidden (could be changed in the future to provide a print preview).
overlayCSS.opacity = 0;
// Create and attach the elements.
var overlay = createElement('div', { className: 'html2pdf__overlay', style: overlayCSS });
var container = createElement('div', { className: 'html2pdf__container', style: containerCSS });
container.appendChild(source);
overlay.appendChild(container);
document.body.appendChild(overlay);
// Enable page-breaks.
var pageBreaks = source.querySelectorAll('.html2pdf__page-break');
var pxPageHeight = pageSize.inner.height * pageSize.k / 72 * 96;
Array.prototype.forEach.call(pageBreaks, function(el) {
el.style.display = 'block';
var clientRect = el.getBoundingClientRect();
el.style.height = pxPageHeight - (clientRect.top % pxPageHeight) + 'px';
}, this);
// Return the container.
return container;
};
html2pdf.makePDF = function(canvas, pageSize, opt) {
// Calculate the number of pages.
var ctx = canvas.getContext('2d');
var pxFullHeight = canvas.height;
var pxPageHeight = Math.floor(canvas.width * pageSize.inner.ratio);
var nPages = Math.ceil(pxFullHeight / pxPageHeight);
// Create a one-page canvas to split up the full image.
var pageCanvas = document.createElement('canvas');
var pageCtx = pageCanvas.getContext('2d');
var pageHeight = pageSize.inner.height;
pageCanvas.width = canvas.width;
pageCanvas.height = pxPageHeight;
// Initialize the PDF.
var pdf = new jsPDF(opt.jsPDF);
for (var page=0; page<nPages; page++) {
// Trim the final page to reduce file size.
if (page === nPages-1) {
pageCanvas.height = pxFullHeight % pxPageHeight;
pageHeight = pageCanvas.height * pageSize.inner.width / pageCanvas.width;
}
// Display the page.
var w = pageCanvas.width;
var h = pageCanvas.height;
pageCtx.fillStyle = 'white';
pageCtx.fillRect(0, 0, w, h);
pageCtx.drawImage(canvas, 0, page*pxPageHeight, w, h, 0, 0, w, h);
// Add the page to the PDF.
if (page) pdf.addPage();
var imgData = pageCanvas.toDataURL('image/' + opt.image.type, opt.image.quality);
pdf.addImage(imgData, opt.image.type, opt.margin[1], opt.margin[0],
pageSize.inner.width, pageHeight);
// Add hyperlinks.
if (opt.enableLinks) {
var pageTop = page * pageSize.inner.height;
opt.links.forEach(function(link) {
if (link.clientRect.top > pageTop && link.clientRect.top < pageTop + pageSize.inner.height) {
var left = opt.margin[1] + link.clientRect.left;
var top = opt.margin[0] + link.clientRect.top - pageTop;
pdf.link(left, top, link.clientRect.width, link.clientRect.height, { url: link.el.href });
}
});
}
}
// Finish the PDF.
pdf.save( opt.filename );
}
/* ---------- UTILS ---------- */
// Determine the type of a variable/object.
var objType = function(obj) {
if (typeof obj === 'undefined') return 'undefined';
else if (typeof obj === 'string' || obj instanceof String) return 'string';
else if (typeof obj === 'number' || obj instanceof Number) return 'number';
else if (!!obj && obj.constructor === Array) return 'array';
else if (obj && obj.nodeType === 1) return 'element';
else if (typeof obj === 'object') return 'object';
else return 'unknown';
};
// Create an HTML element with optional className, innerHTML, and style.
var createElement = function(tagName, opt) {
var el = document.createElement(tagName);
if (opt.className) el.className = opt.className;
if (opt.innerHTML) {
el.innerHTML = opt.innerHTML;
var scripts = el.getElementsByTagName('script');
for (var i = scripts.length; i-- > 0; null) {
scripts[i].parentNode.removeChild(scripts[i]);
}
}
for (var key in opt.style) {
el.style[key] = opt.style[key];
}
return el;
};
// Deep-clone a node and preserve contents/properties.
var cloneNode = function(node, javascriptEnabled) {
// Recursively clone the node.
var clone = node.nodeType === 3 ? document.createTextNode(node.nodeValue) : node.cloneNode(false);
for (var child = node.firstChild; child; child = child.nextSibling) {
if (javascriptEnabled === true || child.nodeType !== 1 || child.nodeName !== 'SCRIPT') {
clone.appendChild(cloneNode(child, javascriptEnabled));
}
}
if (node.nodeType === 1) {
// Preserve contents/properties of special nodes.
if (node.nodeName === 'CANVAS') {
clone.width = node.width;
clone.height = node.height;
clone.getContext('2d').drawImage(node, 0, 0);
} else if (node.nodeName === 'TEXTAREA' || node.nodeName === 'SELECT') {
clone.value = node.value;
}
// Preserve the node's scroll position when it loads.
clone.addEventListener('load', function() {
clone.scrollTop = node.scrollTop;
clone.scrollLeft = node.scrollLeft;
}, true);
}
// Return the cloned node.
return clone;
}
// Convert units using the conversion value 'k' from jsPDF.
var unitConvert = function(obj, k) {
var newObj = {};
for (var key in obj) {
newObj[key] = obj[key] * 72 / 96 / k;
}
return newObj;
};
// Get dimensions of a PDF page, as determined by jsPDF.
jsPDF.getPageSize = function(orientation, unit, format) {
// Decode options object
if (typeof orientation === 'object') {
var options = orientation;
orientation = options.orientation;
unit = options.unit || unit;
format = options.format || format;
}
// Default options
unit = unit || 'mm';
format = format || 'a4';
orientation = ('' + (orientation || 'P')).toLowerCase();
var format_as_string = ('' + format).toLowerCase();
// Size in pt of various paper formats
pageFormats = {
'a0' : [2383.94, 3370.39], 'a1' : [1683.78, 2383.94],
'a2' : [1190.55, 1683.78], 'a3' : [ 841.89, 1190.55],
'a4' : [ 595.28, 841.89], 'a5' : [ 419.53, 595.28],
'a6' : [ 297.64, 419.53], 'a7' : [ 209.76, 297.64],
'a8' : [ 147.40, 209.76], 'a9' : [ 104.88, 147.40],
'a10' : [ 73.70, 104.88], 'b0' : [2834.65, 4008.19],
'b1' : [2004.09, 2834.65], 'b2' : [1417.32, 2004.09],
'b3' : [1000.63, 1417.32], 'b4' : [ 708.66, 1000.63],
'b5' : [ 498.90, 708.66], 'b6' : [ 354.33, 498.90],
'b7' : [ 249.45, 354.33], 'b8' : [ 175.75, 249.45],
'b9' : [ 124.72, 175.75], 'b10' : [ 87.87, 124.72],
'c0' : [2599.37, 3676.54], 'c1' : [1836.85, 2599.37],
'c2' : [1298.27, 1836.85], 'c3' : [ 918.43, 1298.27],
'c4' : [ 649.13, 918.43], 'c5' : [ 459.21, 649.13],
'c6' : [ 323.15, 459.21], 'c7' : [ 229.61, 323.15],
'c8' : [ 161.57, 229.61], 'c9' : [ 113.39, 161.57],
'c10' : [ 79.37, 113.39], 'dl' : [ 311.81, 623.62],
'letter' : [612, 792],
'government-letter' : [576, 756],
'legal' : [612, 1008],
'junior-legal' : [576, 360],
'ledger' : [1224, 792],
'tabloid' : [792, 1224],
'credit-card' : [153, 243]
};
// Unit conversion
switch (unit) {
case 'pt': k = 1; break;
case 'mm': k = 72 / 25.4; break;
case 'cm': k = 72 / 2.54; break;
case 'in': k = 72; break;
case 'px': k = 72 / 96; break;
case 'pc': k = 12; break;
case 'em': k = 12; break;
case 'ex': k = 6; break;
default:
throw ('Invalid unit: ' + unit);
}
// Dimensions are stored as user units and converted to points on output
if (pageFormats.hasOwnProperty(format_as_string)) {
pageHeight = pageFormats[format_as_string][1] / k;
pageWidth = pageFormats[format_as_string][0] / k;
} else {
try {
pageHeight = format[1];
pageWidth = format[0];
} catch (err) {
throw new Error('Invalid format: ' + format);
}
}
// Handle page orientation
if (orientation === 'p' || orientation === 'portrait') {
orientation = 'p';
if (pageWidth > pageHeight) {
tmp = pageWidth;
pageWidth = pageHeight;
pageHeight = tmp;
}
} else if (orientation === 'l' || orientation === 'landscape') {
orientation = 'l';
if (pageHeight > pageWidth) {
tmp = pageWidth;
pageWidth = pageHeight;
pageHeight = tmp;
}
} else {
throw('Invalid orientation: ' + orientation);
}
// Return information (k is the unit conversion ratio from pts)
var info = { 'width': pageWidth, 'height': pageHeight, 'unit': unit, 'k': k };
return info;
};
// Expose the html2pdf function.
return html2pdf;
}(html2canvas, jsPDF));

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{% block js_extra %}
{% if order %}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jspdf/1.3.5/jspdf.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/html2canvas/0.4.1/html2canvas.min.js"></script>
<script src="{% static 'hosting/js/html2canvas.min.js' %}"></script>
<script src="{% static 'hosting/js/html2pdf.js' %}"></script>
<script src="{% static 'hosting/js/order.js' %}"></script>
{% endif %}