923 lines
30 KiB
JavaScript
923 lines
30 KiB
JavaScript
/**
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* html2pdf.js v0.9.1
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* Copyright (c) 2018 Erik Koopmans
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* Released under the MIT License.
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*/
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(function (global, factory) {
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typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory(require('es6-promise/auto'), require('jspdf'), require('html2canvas')) :
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typeof define === 'function' && define.amd ? define(['es6-promise/auto', 'jspdf', 'html2canvas'], factory) :
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(global.html2pdf = factory(null,global.jsPDF,global.html2canvas));
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}(this, (function (auto,jsPDF,html2canvas) { 'use strict';
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jsPDF = jsPDF && jsPDF.hasOwnProperty('default') ? jsPDF['default'] : jsPDF;
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html2canvas = html2canvas && html2canvas.hasOwnProperty('default') ? html2canvas['default'] : html2canvas;
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var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) {
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return typeof obj;
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} : function (obj) {
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return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj;
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};
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var _extends = Object.assign || function (target) {
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for (var i = 1; i < arguments.length; i++) {
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var source = arguments[i];
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for (var key in source) {
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if (Object.prototype.hasOwnProperty.call(source, key)) {
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target[key] = source[key];
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}
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}
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}
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return target;
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};
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// Determine the type of a variable/object.
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var objType = function objType(obj) {
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var type = typeof obj === 'undefined' ? 'undefined' : _typeof(obj);
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if (type === 'undefined') return 'undefined';else if (type === 'string' || obj instanceof String) return 'string';else if (type === 'number' || obj instanceof Number) return 'number';else if (type === 'function' || obj instanceof Function) return 'function';else if (!!obj && obj.constructor === Array) return 'array';else if (obj && obj.nodeType === 1) return 'element';else if (type === 'object') return 'object';else return 'unknown';
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};
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// Create an HTML element with optional className, innerHTML, and style.
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var createElement = function createElement(tagName, opt) {
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var el = document.createElement(tagName);
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if (opt.className) el.className = opt.className;
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if (opt.innerHTML) {
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el.innerHTML = opt.innerHTML;
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var scripts = el.getElementsByTagName('script');
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for (var i = scripts.length; i-- > 0; null) {
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scripts[i].parentNode.removeChild(scripts[i]);
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}
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}
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for (var key in opt.style) {
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el.style[key] = opt.style[key];
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}
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return el;
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};
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// Deep-clone a node and preserve contents/properties.
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var cloneNode = function cloneNode(node, javascriptEnabled) {
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// Recursively clone the node.
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var clone = node.nodeType === 3 ? document.createTextNode(node.nodeValue) : node.cloneNode(false);
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for (var child = node.firstChild; child; child = child.nextSibling) {
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if (javascriptEnabled === true || child.nodeType !== 1 || child.nodeName !== 'SCRIPT') {
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clone.appendChild(cloneNode(child, javascriptEnabled));
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}
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}
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if (node.nodeType === 1) {
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// Preserve contents/properties of special nodes.
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if (node.nodeName === 'CANVAS') {
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clone.width = node.width;
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clone.height = node.height;
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clone.getContext('2d').drawImage(node, 0, 0);
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} else if (node.nodeName === 'TEXTAREA' || node.nodeName === 'SELECT') {
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clone.value = node.value;
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}
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// Preserve the node's scroll position when it loads.
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clone.addEventListener('load', function () {
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clone.scrollTop = node.scrollTop;
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clone.scrollLeft = node.scrollLeft;
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}, true);
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}
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// Return the cloned node.
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return clone;
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};
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// Convert units from px using the conversion value 'k' from jsPDF.
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var unitConvert = function unitConvert(obj, k) {
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if (objType(obj) === 'number') {
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return obj * 72 / 96 / k;
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} else {
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var newObj = {};
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for (var key in obj) {
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newObj[key] = obj[key] * 72 / 96 / k;
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}
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return newObj;
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}
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};
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// Convert units to px using the conversion value 'k' from jsPDF.
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var toPx = function toPx(val, k) {
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return Math.floor(val * k / 72 * 96);
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};
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/* ----- CONSTRUCTOR ----- */
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var Worker = function Worker(opt) {
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// Create the root parent for the proto chain, and the starting Worker.
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var root = _extends(Worker.convert(Promise.resolve()), JSON.parse(JSON.stringify(Worker.template)));
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var self = Worker.convert(Promise.resolve(), root);
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// Set progress, optional settings, and return.
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self = self.setProgress(1, Worker, 1, [Worker]);
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self = self.set(opt);
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return self;
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};
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// Boilerplate for subclassing Promise.
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Worker.prototype = Object.create(Promise.prototype);
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Worker.prototype.constructor = Worker;
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// Converts/casts promises into Workers.
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Worker.convert = function convert(promise, inherit) {
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// Uses prototypal inheritance to receive changes made to ancestors' properties.
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promise.__proto__ = inherit || Worker.prototype;
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return promise;
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};
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Worker.template = {
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prop: {
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src: null,
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container: null,
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overlay: null,
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canvas: null,
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img: null,
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pdf: null,
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pageSize: null
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},
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progress: {
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val: 0,
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state: null,
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n: 0,
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stack: []
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},
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opt: {
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filename: 'file.pdf',
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margin: [0, 0, 0, 0],
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image: { type: 'jpeg', quality: 0.95 },
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enableLinks: true,
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html2canvas: {},
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jsPDF: {}
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}
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};
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/* ----- FROM / TO ----- */
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Worker.prototype.from = function from(src, type) {
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function getType(src) {
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switch (objType(src)) {
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case 'string':
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return 'string';
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case 'element':
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return src.nodeName.toLowerCase === 'canvas' ? 'canvas' : 'element';
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default:
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return 'unknown';
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}
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}
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return this.then(function from_main() {
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type = type || getType(src);
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switch (type) {
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case 'string':
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return this.set({ src: createElement('div', { innerHTML: src }) });
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case 'element':
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return this.set({ src: src });
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case 'canvas':
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return this.set({ canvas: src });
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case 'img':
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return this.set({ img: src });
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default:
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return this.error('Unknown source type.');
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}
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});
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};
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Worker.prototype.to = function to(target) {
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// Route the 'to' request to the appropriate method.
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switch (target) {
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case 'container':
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return this.toContainer();
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case 'canvas':
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return this.toCanvas();
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case 'img':
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return this.toImg();
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case 'pdf':
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return this.toPdf();
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default:
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return this.error('Invalid target.');
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}
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};
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Worker.prototype.toContainer = function toContainer() {
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// Set up function prerequisites.
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var prereqs = [function checkSrc() {
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return this.prop.src || this.error('Cannot duplicate - no source HTML.');
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}, function checkPageSize() {
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return this.prop.pageSize || this.setPageSize();
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}];
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return this.thenList(prereqs).then(function toContainer_main() {
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// Define the CSS styles for the container and its overlay parent.
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var overlayCSS = {
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position: 'fixed', overflow: 'hidden', zIndex: 1000,
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left: 0, right: 0, bottom: 0, top: 0,
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backgroundColor: 'rgba(0,0,0,0.8)'
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};
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var containerCSS = {
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position: 'absolute', width: this.prop.pageSize.inner.width + this.prop.pageSize.unit,
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left: 0, right: 0, top: 0, height: 'auto', margin: 'auto',
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backgroundColor: 'white'
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};
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// Set the overlay to hidden (could be changed in the future to provide a print preview).
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overlayCSS.opacity = 0;
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// Create and attach the elements.
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var source = cloneNode(this.prop.src, this.opt.html2canvas.javascriptEnabled);
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this.prop.overlay = createElement('div', { className: 'html2pdf__overlay', style: overlayCSS });
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this.prop.container = createElement('div', { className: 'html2pdf__container', style: containerCSS });
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this.prop.container.appendChild(source);
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this.prop.overlay.appendChild(this.prop.container);
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document.body.appendChild(this.prop.overlay);
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});
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};
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Worker.prototype.toCanvas = function toCanvas() {
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// Set up function prerequisites.
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var prereqs = [function checkContainer() {
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return document.body.contains(this.prop.container) || this.toContainer();
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}];
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// Fulfill prereqs then create the canvas.
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return this.thenList(prereqs).then(function toCanvas_main() {
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// Handle old-fashioned 'onrendered' argument.
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var options = _extends({}, this.opt.html2canvas);
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delete options.onrendered;
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return html2canvas(this.prop.container, options);
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}).then(function toCanvas_post(canvas) {
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// Handle old-fashioned 'onrendered' argument.
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var onRendered = this.opt.html2canvas.onrendered || function () {};
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onRendered(canvas);
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this.prop.canvas = canvas;
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document.body.removeChild(this.prop.overlay);
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});
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};
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Worker.prototype.toImg = function toImg() {
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// Set up function prerequisites.
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var prereqs = [function checkCanvas() {
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return this.prop.canvas || this.toCanvas();
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}];
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// Fulfill prereqs then create the image.
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return this.thenList(prereqs).then(function toImg_main() {
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var imgData = this.prop.canvas.toDataURL('image/' + this.opt.image.type, this.opt.image.quality);
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this.prop.img = document.createElement('img');
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this.prop.img.src = imgData;
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});
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};
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Worker.prototype.toPdf = function toPdf() {
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// Set up function prerequisites.
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var prereqs = [function checkCanvas() {
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return this.prop.canvas || this.toCanvas();
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}];
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// Fulfill prereqs then create the image.
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return this.thenList(prereqs).then(function toPdf_main() {
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// Create local copies of frequently used properties.
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var canvas = this.prop.canvas;
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var opt = this.opt;
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// Calculate the number of pages.
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var ctx = canvas.getContext('2d');
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var pxFullHeight = canvas.height;
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var pxPageHeight = Math.floor(canvas.width * this.prop.pageSize.inner.ratio);
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var nPages = Math.ceil(pxFullHeight / pxPageHeight);
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// Define pageHeight separately so it can be trimmed on the final page.
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var pageHeight = this.prop.pageSize.inner.height;
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// Create a one-page canvas to split up the full image.
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var pageCanvas = document.createElement('canvas');
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var pageCtx = pageCanvas.getContext('2d');
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pageCanvas.width = canvas.width;
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pageCanvas.height = pxPageHeight;
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// Initialize the PDF.
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this.prop.pdf = this.prop.pdf || new jsPDF(opt.jsPDF);
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for (var page = 0; page < nPages; page++) {
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// Trim the final page to reduce file size.
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if (page === nPages - 1) {
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pageCanvas.height = pxFullHeight % pxPageHeight;
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pageHeight = pageCanvas.height * this.prop.pageSize.inner.width / pageCanvas.width;
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}
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// Display the page.
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var w = pageCanvas.width;
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var h = pageCanvas.height;
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pageCtx.fillStyle = 'white';
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pageCtx.fillRect(0, 0, w, h);
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pageCtx.drawImage(canvas, 0, page * pxPageHeight, w, h, 0, 0, w, h);
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// Add the page to the PDF.
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if (page) this.prop.pdf.addPage();
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var imgData = pageCanvas.toDataURL('image/' + opt.image.type, opt.image.quality);
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this.prop.pdf.addImage(imgData, opt.image.type, opt.margin[1], opt.margin[0], this.prop.pageSize.inner.width, pageHeight);
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}
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});
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};
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/* ----- OUTPUT / SAVE ----- */
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Worker.prototype.output = function output(type, options, src) {
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// Redirect requests to the correct function (outputPdf / outputImg).
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src = src || 'pdf';
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if (src.toLowerCase() === 'img' || src.toLowerCase() === 'image') {
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return this.outputImg(type, options);
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} else {
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return this.outputPdf(type, options);
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}
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};
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Worker.prototype.outputPdf = function outputPdf(type, options) {
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// Set up function prerequisites.
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var prereqs = [function checkPdf() {
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return this.prop.pdf || this.toPdf();
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}];
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// Fulfill prereqs then perform the appropriate output.
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return this.thenList(prereqs).then(function outputPdf_main() {
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/* Currently implemented output types:
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* https://rawgit.com/MrRio/jsPDF/master/docs/jspdf.js.html#line992
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* save(options), arraybuffer, blob, bloburi/bloburl,
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* datauristring/dataurlstring, dataurlnewwindow, datauri/dataurl
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*/
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return this.prop.pdf.output(type, options);
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});
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};
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Worker.prototype.outputImg = function outputImg(type, options) {
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// Set up function prerequisites.
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var prereqs = [function checkImg() {
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return this.prop.img || this.toImg();
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}];
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// Fulfill prereqs then perform the appropriate output.
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return this.thenList(prereqs).then(function outputImg_main() {
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switch (type) {
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case undefined:
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case 'img':
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return this.prop.img;
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case 'datauristring':
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case 'dataurlstring':
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return this.prop.img.src;
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case 'datauri':
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case 'dataurl':
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return document.location.href = this.prop.img.src;
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default:
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throw 'Image output type "' + type + '" is not supported.';
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}
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});
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};
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Worker.prototype.save = function save(filename) {
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// Set up function prerequisites.
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var prereqs = [function checkPdf() {
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return this.prop.pdf || this.toPdf();
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}];
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// Fulfill prereqs, update the filename (if provided), and save the PDF.
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return this.thenList(prereqs).set(filename ? { filename: filename } : null).then(function save_main() {
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this.prop.pdf.save(this.opt.filename);
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});
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};
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/* ----- SET / GET ----- */
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Worker.prototype.set = function set$$1(opt) {
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// TODO: Implement ordered pairs?
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// Silently ignore invalid or empty input.
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if (objType(opt) !== 'object') {
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return this;
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}
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// Build an array of setter functions to queue.
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var fns = Object.keys(opt || {}).map(function (key) {
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if (key in Worker.template.prop) {
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// Set pre-defined properties.
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return function set_prop() {
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this.prop[key] = opt[key];
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};
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} else {
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switch (key) {
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case 'margin':
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return this.setMargin.bind(this, opt.margin);
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case 'jsPDF':
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return function set_jsPDF() {
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this.opt.jsPDF = opt.jsPDF;return this.setPageSize();
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};
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case 'pageSize':
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return this.setPageSize.bind(this, opt.pageSize);
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default:
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// Set any other properties in opt.
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return function set_opt() {
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this.opt[key] = opt[key];
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};
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}
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}
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}, this);
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// Set properties within the promise chain.
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return this.then(function set_main() {
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return this.thenList(fns);
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});
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};
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Worker.prototype.get = function get$$1(key, cbk) {
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return this.then(function get_main() {
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// Fetch the requested property, either as a predefined prop or in opt.
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var val = key in Worker.template.prop ? this.prop[key] : this.opt[key];
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return cbk ? cbk(val) : val;
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});
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};
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Worker.prototype.setMargin = function setMargin(margin) {
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return this.then(function setMargin_main() {
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// Parse the margin property: [top, left, bottom, right].
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switch (objType(margin)) {
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case 'number':
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margin = [margin, margin, margin, margin];
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case 'array':
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if (margin.length === 2) {
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margin = [margin[0], margin[1], margin[0], margin[1]];
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}
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if (margin.length === 4) {
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break;
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}
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default:
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return this.error('Invalid margin array.');
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}
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// Set the margin property, then update pageSize.
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this.opt.margin = margin;
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}).then(this.setPageSize);
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};
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Worker.prototype.setPageSize = function setPageSize(pageSize) {
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return this.then(function setPageSize_main() {
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// Retrieve page-size based on jsPDF settings, if not explicitly provided.
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pageSize = pageSize || jsPDF.getPageSize(this.opt.jsPDF);
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// Add 'inner' field if not present.
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if (!pageSize.hasOwnProperty('inner')) {
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pageSize.inner = {
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width: pageSize.width - this.opt.margin[1] - this.opt.margin[3],
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height: pageSize.height - this.opt.margin[0] - this.opt.margin[2]
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};
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pageSize.inner.px = {
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width: toPx(pageSize.inner.width, pageSize.k),
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height: toPx(pageSize.inner.height, pageSize.k)
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};
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pageSize.inner.ratio = pageSize.inner.height / pageSize.inner.width;
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}
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// Attach pageSize to this.
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this.prop.pageSize = pageSize;
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});
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};
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Worker.prototype.setProgress = function setProgress(val, state, n, stack) {
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// Immediately update all progress values.
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if (val != null) this.progress.val = val;
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if (state != null) this.progress.state = state;
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if (n != null) this.progress.n = n;
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if (stack != null) this.progress.stack = stack;
|
|
this.progress.ratio = this.progress.val / this.progress.state;
|
|
|
|
// Return this for command chaining.
|
|
return this;
|
|
};
|
|
|
|
Worker.prototype.updateProgress = function updateProgress(val, state, n, stack) {
|
|
// Immediately update all progress values, using setProgress.
|
|
return this.setProgress(val ? this.progress.val + val : null, state ? state : null, n ? this.progress.n + n : null, stack ? this.progress.stack.concat(stack) : null);
|
|
};
|
|
|
|
/* ----- PROMISE MAPPING ----- */
|
|
|
|
Worker.prototype.then = function then(onFulfilled, onRejected) {
|
|
// Wrap `this` for encapsulation.
|
|
var self = this;
|
|
|
|
return this.thenCore(onFulfilled, onRejected, function then_main(onFulfilled, onRejected) {
|
|
// Update progress while queuing, calling, and resolving `then`.
|
|
self.updateProgress(null, null, 1, [onFulfilled]);
|
|
return Promise.prototype.then.call(this, function then_pre(val) {
|
|
self.updateProgress(null, onFulfilled);
|
|
return val;
|
|
}).then(onFulfilled, onRejected).then(function then_post(val) {
|
|
self.updateProgress(1);
|
|
return val;
|
|
});
|
|
});
|
|
};
|
|
|
|
Worker.prototype.thenCore = function thenCore(onFulfilled, onRejected, thenBase) {
|
|
// Handle optional thenBase parameter.
|
|
thenBase = thenBase || Promise.prototype.then;
|
|
|
|
// Wrap `this` for encapsulation and bind it to the promise handlers.
|
|
var self = this;
|
|
if (onFulfilled) {
|
|
onFulfilled = onFulfilled.bind(self);
|
|
}
|
|
if (onRejected) {
|
|
onRejected = onRejected.bind(self);
|
|
}
|
|
|
|
// Cast self into a Promise to avoid polyfills recursively defining `then`.
|
|
var isNative = Promise.toString().indexOf('[native code]') !== -1 && Promise.name === 'Promise';
|
|
var selfPromise = isNative ? self : Worker.convert(_extends({}, self), Promise.prototype);
|
|
|
|
// Return the promise, after casting it into a Worker and preserving props.
|
|
var returnVal = thenBase.call(selfPromise, onFulfilled, onRejected);
|
|
return Worker.convert(returnVal, self.__proto__);
|
|
};
|
|
|
|
Worker.prototype.thenExternal = function thenExternal(onFulfilled, onRejected) {
|
|
// Call `then` and return a standard promise (exits the Worker chain).
|
|
return Promise.prototype.then.call(this, onFulfilled, onRejected);
|
|
};
|
|
|
|
Worker.prototype.thenList = function thenList(fns) {
|
|
// Queue a series of promise 'factories' into the promise chain.
|
|
var self = this;
|
|
fns.forEach(function thenList_forEach(fn) {
|
|
self = self.thenCore(fn);
|
|
});
|
|
return self;
|
|
};
|
|
|
|
Worker.prototype['catch'] = function (onRejected) {
|
|
// Bind `this` to the promise handler, call `catch`, and return a Worker.
|
|
if (onRejected) {
|
|
onRejected = onRejected.bind(this);
|
|
}
|
|
var returnVal = Promise.prototype['catch'].call(this, onRejected);
|
|
return Worker.convert(returnVal, this);
|
|
};
|
|
|
|
Worker.prototype.catchExternal = function catchExternal(onRejected) {
|
|
// Call `catch` and return a standard promise (exits the Worker chain).
|
|
return Promise.prototype['catch'].call(this, onRejected);
|
|
};
|
|
|
|
Worker.prototype.error = function error(msg) {
|
|
// Throw the error in the Promise chain.
|
|
return this.then(function error_main() {
|
|
throw new Error(msg);
|
|
});
|
|
};
|
|
|
|
/* ----- ALIASES ----- */
|
|
|
|
Worker.prototype.using = Worker.prototype.set;
|
|
Worker.prototype.saveAs = Worker.prototype.save;
|
|
Worker.prototype.export = Worker.prototype.output;
|
|
Worker.prototype.run = Worker.prototype.then;
|
|
|
|
// Import dependencies.
|
|
// Get dimensions of a PDF page, as determined by jsPDF.
|
|
jsPDF.getPageSize = function (orientation, unit, format) {
|
|
// Decode options object
|
|
if ((typeof orientation === 'undefined' ? 'undefined' : _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
|
|
var 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':
|
|
var k = 1;break;
|
|
case 'mm':
|
|
var k = 72 / 25.4;break;
|
|
case 'cm':
|
|
var k = 72 / 2.54;break;
|
|
case 'in':
|
|
var k = 72;break;
|
|
case 'px':
|
|
var k = 72 / 96;break;
|
|
case 'pc':
|
|
var k = 12;break;
|
|
case 'em':
|
|
var k = 12;break;
|
|
case 'ex':
|
|
var 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)) {
|
|
var pageHeight = pageFormats[format_as_string][1] / k;
|
|
var pageWidth = pageFormats[format_as_string][0] / k;
|
|
} else {
|
|
try {
|
|
var pageHeight = format[1];
|
|
var pageWidth = format[0];
|
|
} catch (err) {
|
|
throw new Error('Invalid format: ' + format);
|
|
}
|
|
}
|
|
|
|
// Handle page orientation
|
|
if (orientation === 'p' || orientation === 'portrait') {
|
|
orientation = 'p';
|
|
if (pageWidth > pageHeight) {
|
|
var tmp = pageWidth;
|
|
pageWidth = pageHeight;
|
|
pageHeight = tmp;
|
|
}
|
|
} else if (orientation === 'l' || orientation === 'landscape') {
|
|
orientation = 'l';
|
|
if (pageHeight > pageWidth) {
|
|
var 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;
|
|
};
|
|
|
|
/* Pagebreak plugin:
|
|
|
|
Adds page-break functionality to the html2pdf library. Page-breaks can be
|
|
enabled by CSS styles, set on individual elements using selectors, or
|
|
avoided from breaking inside all elements.
|
|
|
|
Options on the `opt.pagebreak` object:
|
|
|
|
mode: String or array of strings: 'avoid-all', 'css', and/or 'legacy'
|
|
Default: ['css', 'legacy']
|
|
|
|
before: String or array of CSS selectors for which to add page-breaks
|
|
before each element. Can be a specific element with an ID
|
|
('#myID'), all elements of a type (e.g. 'img'), all of a class
|
|
('.myClass'), or even '*' to match every element.
|
|
|
|
after: Like 'before', but adds a page-break immediately after the element.
|
|
|
|
avoid: Like 'before', but avoids page-breaks on these elements. You can
|
|
enable this feature on every element using the 'avoid-all' mode.
|
|
*/
|
|
|
|
// Refs to original functions.
|
|
var orig = {
|
|
toContainer: Worker.prototype.toContainer
|
|
};
|
|
|
|
// Add pagebreak default options to the Worker template.
|
|
Worker.template.opt.pagebreak = {
|
|
mode: ['css', 'legacy'],
|
|
before: [],
|
|
after: [],
|
|
avoid: []
|
|
};
|
|
|
|
Worker.prototype.toContainer = function toContainer() {
|
|
return orig.toContainer.call(this).then(function toContainer_pagebreak() {
|
|
// Setup root element and inner page height.
|
|
var root = this.prop.container;
|
|
var pxPageHeight = this.prop.pageSize.inner.px.height;
|
|
|
|
// Check all requested modes.
|
|
var modeSrc = [].concat(this.opt.pagebreak.mode);
|
|
var mode = {
|
|
avoidAll: modeSrc.indexOf('avoid-all') !== -1,
|
|
css: modeSrc.indexOf('css') !== -1,
|
|
legacy: modeSrc.indexOf('legacy') !== -1
|
|
};
|
|
|
|
// Get arrays of all explicitly requested elements.
|
|
var select = {};
|
|
var self = this;
|
|
['before', 'after', 'avoid'].forEach(function (key) {
|
|
var all = mode.avoidAll && key === 'avoid';
|
|
select[key] = all ? [] : [].concat(self.opt.pagebreak[key] || []);
|
|
if (select[key].length > 0) {
|
|
select[key] = Array.prototype.slice.call(root.querySelectorAll(select[key].join(', ')));
|
|
}
|
|
});
|
|
|
|
// Get all legacy page-break elements.
|
|
var legacyEls = root.querySelectorAll('.html2pdf__page-break');
|
|
legacyEls = Array.prototype.slice.call(legacyEls);
|
|
|
|
// Loop through all elements.
|
|
var els = root.querySelectorAll('*');
|
|
Array.prototype.forEach.call(els, function pagebreak_loop(el) {
|
|
// Setup pagebreak rules based on legacy and avoidAll modes.
|
|
var rules = {
|
|
before: false,
|
|
after: mode.legacy && legacyEls.indexOf(el) !== -1,
|
|
avoid: mode.avoidAll
|
|
};
|
|
|
|
// Add rules for css mode.
|
|
if (mode.css) {
|
|
// TODO: Check if this is valid with iFrames.
|
|
var style = window.getComputedStyle(el);
|
|
// TODO: Handle 'left' and 'right' correctly.
|
|
// TODO: Add support for 'avoid' on breakBefore/After.
|
|
var breakOpt = ['always', 'page', 'left', 'right'];
|
|
var avoidOpt = ['avoid', 'avoid-page'];
|
|
rules = {
|
|
before: rules.before || breakOpt.indexOf(style.breakBefore || style.pageBreakBefore) !== -1,
|
|
after: rules.after || breakOpt.indexOf(style.breakAfter || style.pageBreakAfter) !== -1,
|
|
avoid: rules.avoid || avoidOpt.indexOf(style.breakInside || style.pageBreakInside) !== -1
|
|
};
|
|
}
|
|
|
|
// Add rules for explicit requests.
|
|
Object.keys(rules).forEach(function (key) {
|
|
rules[key] = rules[key] || select[key].indexOf(el) !== -1;
|
|
});
|
|
|
|
// Get element position on the screen.
|
|
// TODO: Subtract the top of the container from clientRect.top/bottom?
|
|
var clientRect = el.getBoundingClientRect();
|
|
|
|
// Avoid: Check if a break happens mid-element.
|
|
if (rules.avoid && !rules.before) {
|
|
var startPage = Math.floor(clientRect.top / pxPageHeight);
|
|
var endPage = Math.floor(clientRect.bottom / pxPageHeight);
|
|
var nPages = Math.abs(clientRect.bottom - clientRect.top) / pxPageHeight;
|
|
|
|
// Turn on rules.before if the el is broken and is at most one page long.
|
|
if (endPage !== startPage && nPages <= 1) {
|
|
rules.before = true;
|
|
}
|
|
}
|
|
|
|
// Before: Create a padding div to push the element to the next page.
|
|
if (rules.before) {
|
|
var pad = createElement('div', { style: {
|
|
display: 'block',
|
|
height: pxPageHeight - clientRect.top % pxPageHeight + 'px'
|
|
} });
|
|
el.parentNode.insertBefore(pad, el);
|
|
}
|
|
|
|
// After: Create a padding div to fill the remaining page.
|
|
if (rules.after) {
|
|
var pad = createElement('div', { style: {
|
|
display: 'block',
|
|
height: pxPageHeight - clientRect.bottom % pxPageHeight + 'px'
|
|
} });
|
|
el.parentNode.insertBefore(pad, el.nextSibling);
|
|
}
|
|
});
|
|
});
|
|
};
|
|
|
|
// Add hyperlink functionality to the PDF creation.
|
|
|
|
// Main link array, and refs to original functions.
|
|
var linkInfo = [];
|
|
var orig$1 = {
|
|
toContainer: Worker.prototype.toContainer,
|
|
toPdf: Worker.prototype.toPdf
|
|
};
|
|
|
|
Worker.prototype.toContainer = function toContainer() {
|
|
return orig$1.toContainer.call(this).then(function toContainer_hyperlink() {
|
|
// Retrieve hyperlink info if the option is enabled.
|
|
if (this.opt.enableLinks) {
|
|
// Find all anchor tags and get the container's bounds for reference.
|
|
var container = this.prop.container;
|
|
var links = container.querySelectorAll('a');
|
|
var containerRect = unitConvert(container.getBoundingClientRect(), this.prop.pageSize.k);
|
|
linkInfo = [];
|
|
|
|
// Loop through each anchor tag.
|
|
Array.prototype.forEach.call(links, function (link) {
|
|
// Treat each client rect as a separate link (for text-wrapping).
|
|
var clientRects = link.getClientRects();
|
|
for (var i = 0; i < clientRects.length; i++) {
|
|
var clientRect = unitConvert(clientRects[i], this.prop.pageSize.k);
|
|
clientRect.left -= containerRect.left;
|
|
clientRect.top -= containerRect.top;
|
|
|
|
var page = Math.floor(clientRect.top / this.prop.pageSize.inner.height) + 1;
|
|
var top = this.opt.margin[0] + clientRect.top % this.prop.pageSize.inner.height;
|
|
var left = this.opt.margin[1] + clientRect.left;
|
|
|
|
linkInfo.push({ page: page, top: top, left: left, clientRect: clientRect, link: link });
|
|
}
|
|
}, this);
|
|
}
|
|
});
|
|
};
|
|
|
|
Worker.prototype.toPdf = function toPdf() {
|
|
return orig$1.toPdf.call(this).then(function toPdf_hyperlink() {
|
|
// Add hyperlinks if the option is enabled.
|
|
if (this.opt.enableLinks) {
|
|
// Attach each anchor tag based on info from toContainer().
|
|
linkInfo.forEach(function (l) {
|
|
this.prop.pdf.setPage(l.page);
|
|
this.prop.pdf.link(l.left, l.top, l.clientRect.width, l.clientRect.height, { url: l.link.href });
|
|
}, this);
|
|
|
|
// Reset the active page of the PDF to the final page.
|
|
var nPages = this.prop.pdf.internal.getNumberOfPages();
|
|
this.prop.pdf.setPage(nPages);
|
|
}
|
|
});
|
|
};
|
|
|
|
/**
|
|
* 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 html2pdf(src, opt) {
|
|
// Create a new worker with the given options.
|
|
var worker = new html2pdf.Worker(opt);
|
|
|
|
if (src) {
|
|
// If src is specified, perform the traditional 'simple' operation.
|
|
return worker.from(src).save();
|
|
} else {
|
|
// Otherwise, return the worker for new Promise-based operation.
|
|
return worker;
|
|
}
|
|
};
|
|
html2pdf.Worker = Worker;
|
|
|
|
return html2pdf;
|
|
|
|
})));
|