方便地导出公众号文章中以图片形式上传的试卷，让您一键开卷！
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// ==UserScript==
// @name 微信公众号 PDF 导出脚本
// @namespace mem.ac/weixin-print-to-pdf
// @version 1.4.2
// @description 方便地导出公众号文章中以图片形式上传的试卷，让您一键开卷！
// @author memset0
// @license AGPL-v3.0
// @match https://mp.weixin.qq.com/s*
// @updateurl https://cdn.jsdelivr.net/gh/memset0/weixin-print-to-pdf/index.js
// @downloadurl https://cdn.jsdelivr.net/gh/memset0/weixin-print-to-pdf/index.js
// @run-at document-start
// ==/UserScript==
const CSS = `
.mem-print-container {
}
.mem-print-settings {
margin: auto;
padding: 16px;
}
.mem-print-settings-btn-group button {
margin-right: 6px;
}
#mem-print-main {
line-height: 0px;
margin-bottom: 20px;
/* padding: 16px;
border: 1px solid #D9DADC; */
}
#mem-print-main button {
margin-right: 8px;
}
`;
function log(...args) {
console.log('[@memset0/weixin-print-to-pdf]', ...args);
}
function isInteger(value) {
const converted = +value;
return !isNaN(converted) && Number.isInteger(converted);
}
function applyFilter(iterable, filterPattern) {
const illegalFilter = (msg) => (alert('Illegal filter: ' + String(msg)), []);
const flag = [];
for (const _ in iterable) {
flag.push(false);
}
if (!filterPattern || filterPattern == '-') {
for (const i in flag) {
flag[+i] = true;
}
} else {
const filters = filterPattern.split(',');
for (const filter of filters) {
if (filter.includes('-')) {
const splited = filter.split('-');
if (splited.length > 2) {
return illegalFilter('wrong interval');
}
if (!splited[0]) {
splited[0] = 0;
}
if (!splited[1]) {
splited[1] = iterable.length - 1;
}
if (!isInteger(splited[0]) || !isInteger(splited[1])) {
return illegalFilter('not a number');
}
for (let i = +splited[0] - 1; i < +splited[1]; i++) {
if (i < 0 || i >= flag.length) {
return illegalFilter('out of range');
}
flag[i] = true;
}
} else {
if (!isInteger(filter)) {
return illegalFilter('not a number');
}
const x = +filter - 1;
if (x < 0 || x >= flag.length) {
return illegalFilter('out of range');
}
flag[x] = true;
}
}
}
log('apply filter:', filter, flag);
const result = [];
for (const i in iterable) {
if (flag[+i]) {
result.push(iterable[+i]);
}
}
return result;
}
function scrollTo(type) {
const scrollSpeed = 50;
if (type !== 'top' && type !== 'bottom') { throw new Error('type error!'); }
const scrollHeight = document.documentElement.scrollHeight || document.body.scrollHeight;
let promiseResolve = null;
let lastTimestamp = null;
let scrollRecords = [];
function scrollAnimated(timestamp) {
const currentScroll = document.documentElement.scrollTop || document.body.scrollTop;
scrollRecords.push(currentScroll);
if (scrollRecords.length > 5) {
scrollRecords.shift();
let finishedFlag = true;
for (let i = 1; i < scrollRecords.length; i++) {
if (scrollRecords[i] !== scrollRecords[i - 1]) {
finishedFlag = false;
break;
}
}
if (finishedFlag) {
// log('finish', scrollRecords, finishedFlag);
return promiseResolve(type);
}
}
if (lastTimestamp === null) {
lastTimestamp = timestamp;
} else {
const deltaTimestamp = timestamp - lastTimestamp;
lastTimestamp = timestamp;
window.scrollTo(0, currentScroll + scrollSpeed * (type === 'top' ? -deltaTimestamp : +deltaTimestamp));
log(type, currentScroll, scrollHeight, deltaTimestamp);
}
window.requestAnimationFrame(scrollAnimated);
}
return new Promise((resolve) => {
promiseResolve = resolve;
window.requestAnimationFrame(scrollAnimated);
});
}
async function printToPdf(width, height, margin, html) {
log('print to pdf', width, height, margin);
// await scrollTo('top');
// await scrollTo('bottom');
const pixeledMargin = String(margin).split(' ').map((s) => (s + 'px')).join(' ');
const printStyle =
'<style> /* normalize browsers */ html, body { margin: 0 !important; padding: 0 !important; } </style>' +
'<style> /* page settings */ @page { size: ' + width + 'px ' + height + 'px; margin: ' + pixeledMargin + '; } </style>' +
'<style> div.page { width: ' + (width - margin * 2) + 'px; height: ' + (height - margin * 2) + 'px; } </style>';
html = printStyle + html;
// const document = unsafeWindow.document; // seemingly needless
const blob = new Blob([html], { type: 'text/html;charset=utf-8' });
const blobUrl = URL.createObjectURL(blob);
log('blob url:', blobUrl);
const $iframe = document.createElement('iframe');
$iframe.style.display = 'none';
$iframe.src = blobUrl;
document.body.appendChild($iframe);
$iframe.onload = () => {
setTimeout(() => {
$iframe.focus();
$iframe.contentWindow.print();
}, 1);
};
}
function generateHtmlFromContent(options) {
let html = '';
for (const $element of applyFilter(document.getElementById('js_content').children, options.filter)) {
console.log($element);
html += $element.outerHTML + '\n\n';
}
return html;
}
function generateHtmlFromPictures(options) {
const minimalImageSize = 100;
let html = '<style>' +
'div.page { page-break-after: always; display: flex; justify-content: center; align-items: center; }' +
'div.page>img { width: 100%; max-width: 100%; max-height: 100%; }' +
'div.page>img { border: solid 1px #fff0; } /* this line is magic */' +
'</style>';
for (const $image of applyFilter(document.getElementById('js_content').querySelectorAll('img'), options.filter)) {
const imageSrc = $image.getAttribute('data-src');
const imageWidth = $image.getAttribute('width');
if (!imageSrc) { continue; }
if (imageWidth && imageWidth < minimalImageSize) { continue; }
html += '<div class="page"><img src="' + imageSrc + '"></div>';
// log(imageWidth, imageSrc);
}
return html;
}
class Settings {
createElement() {
this.$inputs = {};
const $dialog = document.createElement('dialog');
$dialog.innerHTML = '<h1 class="mem-print-settings-title">Settings</h1>';
$dialog.className = 'mem-print-settings';
for (const name of Object.keys(this.defaults)) {
const $label = document.createElement('label');
const $input = document.createElement('input');
this.$inputs[name] = $input;
$label.innerText = name;
if (this.defaults[name] !== '') {
$label.innerText += '(default: ' + this.defaults[name] + ')'
}
$label.innerText += ': ';
$input.name = name;
$input.value = this.data[name];
$input.onblur = (event) => {
log('update', $input.name, $input.value);
this.updates[$input.name] = $input.value;
};
$label.appendChild($input);
$dialog.appendChild($label);
$dialog.appendChild(document.createElement('br'));
}
const $btnGroup = document.createElement('div');
$btnGroup.className = 'mem-print-settings-btn-group';
$dialog.appendChild($btnGroup);
const $resetButton = document.createElement('button');
$resetButton.innerText = 'Reset';
$resetButton.name = 'reset';
$resetButton.onclick = () => this.closeWindow(this.defaults);
$btnGroup.appendChild($resetButton);
const $cancelButton = document.createElement('button');
$cancelButton.innerText = 'Cancel';
$cancelButton.name = 'cancel';
$cancelButton.onclick = () => this.closeWindow({});
$btnGroup.appendChild($cancelButton);
const $submitButton = document.createElement('button');
$submitButton.innerText = 'Submit';
$submitButton.name = 'submit';
$submitButton.onclick = () => this.closeWindow(this.updates);
$btnGroup.appendChild($submitButton);
return $dialog;
}
openWindow() {
this.updates = {};
for (const name in this.$inputs) {
// log('dialog open:', name, this.data[name], this.$inputs[name].value);
this.$inputs[name].value = this.data[name];
}
this.$element.showModal();
}
closeWindow(update = null) {
if (update && Object.keys(update).length) {
for (const key in update) {
this.data[key] = update[key];
}
localStorage.setItem(this.storageKey, JSON.stringify(this.data));
}
log('dialog closed:', update, this.data);
this.$element.close();
}
constructor(storageKey = 'mem-print-settings') {
this.storageKey = storageKey;
this.data = {};
this.defaults = {
// Page Settings
width: 797, // A4 8.3inch * 11.7inch
height: 1123,
margin: 0,
zoom: 1,
// Element filters
filter: '',
};
if (localStorage.getItem(storageKey)) {
const storaged = localStorage.getItem(storageKey);
if (storaged) {
this.data = JSON.parse(storaged);
}
}
for (const key in this.defaults) {
if (!Object.keys(this.data).includes(key)) {
this.data[key] = this.defaults[key];
}
}
this.$element = this.createElement();
document.body.appendChild(this.$element);
if (typeof this.$element.showModal !== 'function') {
this.$element.hidden = true;
alert('Your browser doesn\'t support <dialog>, settings may not work.')
}
}
}
async function main() {
function generateDiv(id, className) {
const $div = document.createElement('div');
$div.id = id;
$div.className = className;
return $div;
}
function generateButton(buttonName, callback) {
const $btn = document.createElement('button');
$btn.innerText = buttonName;
$btn.style = 'padding-left: 4px; padding-right: 4px;'
$btn.onclick = () => {
log('Triggered by', [buttonName], $btn);
callback();
}
return $btn;
}
const settings = new Settings();
log(settings.data);
$mainContainer = generateDiv('mem-print-main', 'mem-print-container');
$sideContainer = generateDiv('mem-print-side', 'mem-print-container');
$style = document.createElement('style');
$style.innerHTML = CSS;
$mainContainer.appendChild($style);
document.getElementsByClassName('qr_code_pc')[0].appendChild($sideContainer);
document.getElementById('img-content').parentNode.insertBefore($mainContainer, document.getElementById('img-content'));
console.log($mainContainer, $sideContainer);
printContent = () => {
printToPdf(settings.data.width, settings.data.height, settings.data.margin, generateHtmlFromContent(settings.data));
}
$mainContainer.appendChild(generateButton('Print Content', printContent));
$sideContainer.appendChild(generateButton('Print Content', printContent));
printPictures = () => {
printToPdf(settings.data.width, settings.data.height, settings.data.margin, generateHtmlFromPictures(settings.data));
};
$mainContainer.appendChild(generateButton('Print Pictures', printPictures));
$sideContainer.appendChild(generateButton('Print Pictures', printPictures));
$mainContainer.appendChild(generateButton('Settings', () => { settings.openWindow(); }));
$sideContainer.appendChild(generateButton('Settings', () => { settings.openWindow(); }));
}
document.addEventListener('DOMContentLoaded', main);