Best JavaScript code snippet using puppeteer
popup.js
Source: popup.js
...22 $("#btnForward").click(function() {getBackgroundPage().then(callMethod("forward")).then(updateButtons)});23 $("#btnRewind").click(function() {getBackgroundPage().then(callMethod("rewind")).then(updateButtons)});24 $("#hlPageNo").click(function() {25 showGotoPage = true;26 updateButtons()27 .then(function() {28 $("#gotoPageForm input[name=pageNo]").val("").focus();29 })30 });31 $("#gotoPageForm").submit(function() {32 showGotoPage = false;33 var pageNo = this.pageNo.value;34 if (isNaN(pageNo)) updateButtons();35 else getBackgroundPage().then(callMethod("gotoPage", [pageNo-1])).then(updateButtons);36 return false;37 });38 updateButtons()39 .then(getBackgroundPage)40 .then(callMethod("getPlaybackState"))41 .then(function(state) {42 if (state != "PLAYING") $("#btnPlay").click();43 });44 setInterval(updateButtons, 500);45});46function updateButtons() {47 return getBackgroundPage().then(function(master) {48 return Promise.all([49 getSettings(),50 master.getPlaybackState(),51 master.getDocInfo(),52 master.getCurrentPage(),53 master.getActiveSpeech()54 ])55 })56 .then(spread(function(settings, state, docInfo, pageIndex, speech) {57 $("#imgLoading").toggle(state == "LOADING");58 $("#btnSettings").toggle(state == "STOPPED");59 $("#btnPlay").toggle(state == "PAUSED" || state == "STOPPED");60 $("#btnPause").toggle(state == "PLAYING");...
revisions.js
Source: revisions.js
...37 }.bind(this))38 .then(function() {39 this.set('loading', false);40 this.set('version', this.player.version);41 this.updateButtons();42 }.bind(this))43 .catch(function(e) {44 this.set('loading', true);45 this.set('error', error);46 this.updateButtons();47 }.bind(this));48 },49 prev: function() {50 if(!this.get('canGoPrev')) return;51 this.set('loading', true);52 this.set('error', false);53 this.player.goBack()54 .then(function() {55 this.set('version', this.player.version);56 this.set('loading', false);57 this.updateButtons();58 }.bind(this))59 .catch(function(e) {60 this.set('loading', false);61 this.set('error', e);62 this.updateButtons();63 });64 },65 next: function() {66 if(!this.get('canGoNext')) return;67 this.set('loading', true);68 this.set('error', false);69 this.player.goForward()70 .then(function() {71 this.set('version', this.player.version);72 this.set('loading', false);73 this.updateButtons();74 }.bind(this))75 .catch(function(e) {76 this.set('loading', false);77 this.set('error', e);78 this.updateButtons();79 }.bind(this));80 },81 goVersion: function() {82 var v = this.get('version');83 this.set('loading', true);84 this.set('error', false);85 this.player.goToVersion(v)86 .then(function() {87 this.set('version', this.player.version);88 this.set('loading', false);89 this.updateButtons();90 }.bind(this))91 .catch(function(e) {92 this.set('loading', false);93 this.set('error', e);94 this.updateButtons();95 }.bind(this)); 96 }, 97 restore: function() {98 if(window.confirm('Are you sure you want to restore this version')) {99 this.set('loading', true);100 this.set('error', false);101 this.player.saveCurrentVersion()102 .then(function() {103 this.set('loading', false);104 this.set('version', this.player.version);105 this.updateButtons();106 }.bind(this))107 .catch(function(e) {108 this.set('loading', false);109 this.set('error', e);110 }.bind(this))111 }112 },113 updateButtons: function() {114 this.set({115 canGoPrev: this.player.version > this.player.minVersion + 1,116 canGoNext: this.player.version < this.player.maxVersion117 });118 }119 });...
simple-slider.js
Source: simple-slider.js
...19var paused = false;20window.onload = function() {21 preload(images);22 show();23 updateButtons();24}25function preload(arrayOfImages) {26 $.each(arrayOfImages, function(index, image){27 $('<img/>')[0].src = 'img/' + dir + image;28 });29}30function previousImage() {31 if (current > 0) {32 current--;33 }34 else {35 current = last;36 }37 updateButtons();38 if (!paused)39 resetTimer();40 show();41}42function nextImage() {43 if (current < last) {44 current++;45 }46 else {47 current = first;48 }49 updateButtons();50 if (!paused)51 resetTimer();52 show();53}54function show() {55 if (none) {56 document.getElementById("simple-slider-center").innerHTML = "<img src='img/" + dir + images[current] + "' >";57 updateButtons();58 }59 else if (fade) {60 $('#next').attr("src","img/" + dir + images[current]).hide().fadeIn('slow');61 updateButtons();62 }63 else64 alert('Select a transition');65}66function goto(image_num) {67 current = image_num;68 updateButtons()69 resetTimer();70 show();71}72//This function displays the active button73function updateButtons() {74 //Reprints the button list, with the active button highlighted75 var button_list = '';76 for (var i = 0; i <= last; i++) {77 if (current==i)78 button_list += ' <img src="img/buttons/selected_image.png" onclick="goto(' + i + ')"> ';79 else80 button_list += ' <img src="img/buttons/default_image.png" onclick="goto(' + i + ')"> ';81 }82 if (paused)83 button_list += ' <img src="img/buttons/play.png" onclick="resume()"> ';84 else85 button_list += ' <img src="img/buttons/pause.png" onclick="pause()"> ';86 document.getElementById("simple-slider-buttons").innerHTML = button_list;87}88function pause() {89 paused = true;90 clearInterval(counter);91 updateButtons();92}93function resume() {94 paused = false;95 clearInterval(counter);96 counter = setInterval(timer, (time * 1000));97 updateButtons();98}99function resetTimer() {100 clearInterval(counter);101 counter = setInterval(timer, (time * 1000));102}103var counter = setInterval(timer, (time * 1000)); //1000 will run it every 1 second104function timer() {105 if (current < last) {106 current++;107 show();108 }109 else {110 current = first;111 show();...
SortListBtn.js
Source: SortListBtn.js
1import React from 'react'2import { View, TouchableOpacity, Text, StyleSheet, Dimensions } from 'react-native'3const {width} = Dimensions.get('window')4export default class SortListBtn extends React.Component{5 state = {6 following: false,7 fun: false,8 sport: false,9 buttons:[10 {name: 'Following', isSet: false},11 {name: 'Fun', isSet: false},12 {name: 'Sport', isSet: false},13 {name: 'Study', isSet: false}14 ]15 }16 _onButtonPress = (index) => {17 const {buttons} = this.state18 const {setSort} = this.props19 let updateButtons = buttons.map(btn => btn)20 if (index == 0){21 updateButtons[index].isSet = !buttons[index].isSet22 this.setState({buttons: updateButtons})23 } else {24 updateButtons[index].isSet = !buttons[index].isSet25 updateButtons.forEach((btn, btnIndex) => {26 if (btn.name != 'Following' && btnIndex != index ){27 btn.isSet = false28 }29 })30 this.setState({buttons: updateButtons})31 }32 setSort(updateButtons)33 34 }35 render(){36 const buttons = this.state.buttons.map((button, index) => {37 return(38 <TouchableOpacity key={button.name} onPress={() => this._onButtonPress(index)}>39 <View style={[styles.button, (button.isSet) ? {backgroundColor: '#FE4C4C'} : null ]}>40 <Text 41 adjustsFontSizeToFit 42 style={[styles.text, (button.isSet) ? {color: 'white'} : null]} 43 >44 {button.name}</Text>45 </View>46 </TouchableOpacity>47 )48 })49 return(50 <View style={styles.container}>51 {buttons}52 </View>53 )54 }55}56const styles = StyleSheet.create({57 container: {58 width: '100%',59 height: 45,60 flexDirection: 'row',61 alignItems: 'center',62 justifyContent: 'space-between',63 paddingHorizontal: 864 },65 button:{66 borderColor: '#FE4C4C',67 borderWidth: 1,68 backgroundColor: 'white',69 width: width * 0.23,70 height: width * 0.09,71 borderRadius: 15,72 alignItems: 'center',73 justifyContent: 'center'74 },75 text:{76 fontFamily: 'Jellee-Roman',77 color: '#FE4C4C'78 }...
Editor.js
Source: Editor.js
1Ext.define("BuddiLive.controller.budget.Editor", {2 "extend": "Ext.app.Controller",3 "stores": [4 "transaction.split.FromComboboxStore",5 "transaction.split.ToComboboxStore"6 ],7 "init": function() {8 this.control({9 "budgeteditor combobox": {10 "blur": this.updateButtons,11 "select": this.updateButtons,12 "afterrender": this.updateButtons13 },14 "budgeteditor textfield": {15 "blur": this.updateButtons,16 "afterrender": this.updateButtons,17 "keyup": this.updateButtons18 },19 "budgeteditor button[itemId='ok']": {"click": this.ok},20 "budgeteditor button[itemId='cancel']": {"click": this.cancel}21 });22 },23 24 "cancel": function(component){25 component.up("budgeteditor").close();26 },27 28 "ok": function(component){29 var me = this;30 var window = component.up("budgeteditor");31 var panel = window.initialConfig.panel;32 var selected = window.initialConfig.selected;33 var request = {};34 request.action = (selected ? "update" : "insert");35 if (selected) request.id = selected.id;36 request.name = window.down("textfield[itemId='name']").getValue();37 request.periodType = window.down("textfield[itemId='periodType']").getValue();38 request.parent = window.down("parentcombobox[itemId='parent']").getValue();39 request.type = window.down("combobox[itemId='type']").getValue();40 var conn = new Ext.data.Connection();41 conn.request({42 "url": "data/categories",43 "headers": {44 "Accept": "application/json"45 },46 "method": "POST",47 "jsonData": request,48 "success": function(response){49 window.close();50 panel.fireEvent("reload", panel);51 me.getTransactionSplitFromComboboxStoreStore().load();52 me.getTransactionSplitToComboboxStoreStore().load();53 },54 "failure": function(response){55 BuddiLive.app.error(response);56 }57 });58 },59 60 "updateButtons": function(component, foo, bar, baz){61 var window = component.up("budgeteditor");62 var ok = window.down("button[itemId='ok']");63 var name = window.down("textfield[itemId='name']");64 var periodType = window.down("textfield[itemId='periodType']");65 var type = window.down("combobox[itemId='type']");66 67 ok.setDisabled(name.getValue().length == 0 || periodType.getValue().length == 0 || type.getValue().length == 0);68 }...
menu-contents.js
Source: menu-contents.js
...18 }19 },20 processDied = function() {21 process = null;22 updateButtons();23 },24 setStateClass = function(selection, state) {25 selection.classed(state, function(d, i) {26 return d.state === state;27 });28 },29 updateButtons = function() {30 menuContainer.contentElement.selectAll(".menu-item")31 .each(function(d, i) {32 d.state = d.getState(33 menuState,34 process && process.buttonSpec === d35 );36 })37 .call(setStateClass, "active")38 .call(setStateClass, "ready")39 .call(setStateClass, "disabled");40 };41 menuState.onChange(updateButtons);42 menuContainer.onVisibilityChanged(function() {43 killProcess();44 updateButtons();45 });46 updateButtons();47 return {48 setButtons: function(buttonSpec) {49 buttonSpec.forEach(function(spec) {50 var trigger = function() {51 var wasActive = spec.state === "active";52 killProcess();53 process = spec.f(54 wasActive,55 d3.select(this),56 processDied57 );58 if (process) {59 process.buttonSpec = spec;60 }61 updateButtons();62 },63 64 button = menuContainer.contentElement65 .append(spec.element)66 .datum(spec)67 .classed("menu-item", true)68 .attr("id", function(d, i) {69 return "file-menu-" + spec.text.replace(" ", "-");70 })71 .text(function(d, i) {72 return spec.text;73 })74 .on("click", trigger);75 if (spec.hover) {...
main.js
Source: main.js
...5 const ul = document.querySelector('ul');6 const slides = ul.children;7 const dots = [];8 let currentIndex = 0;9 function updateButtons() {10 prev.classList.remove('hidden');11 next.classList.remove('hidden');12 if (currentIndex === 0) {13 prev.classList.add('hidden');14 }15 if (currentIndex === slides.length - 1) {16 next.classList.add('hidden');17 }18 }19 function moveSlides() {20 const slideWidth = slides[0].getBoundingClientRect().width;21 ul.style.transform = `translateX(${-1 * slideWidth * currentIndex}px)`; 22 }23 function setupdots() {24 for (let i = 0; i < slides.length; i++) {25 const button = document.createElement('button');26 button.addEventListener('click', () => {27 currentIndex = i;28 updateDots();29 updateButtons();30 moveSlides();31 });32 dots.push(button);33 document.querySelector('nav').appendChild(button);34 }35 dots[0].classList.add('current');36 }37 function updateDots() {38 dots.forEach(dot => {39 dot.classList.remove('current');40 });41 dots[currentIndex].classList.add('current');42 }43 updateButtons();44 setupdots();45 next.addEventListener('click', () => {46 currentIndex++;47 updateButtons();48 updateDots();49 // getBoundingClientRect()ã¡ã½ããã®widthããããã£ã§è¦ç´ ã®å¹
ãåå¾ã§ãã50 moveSlides();51 });52 prev.addEventListener('click', () => {53 currentIndex--;54 updateButtons();55 updateDots();56 // getBoundingClientRect()ã¡ã½ããã®widthããããã£ã§è¦ç´ ã®å¹
ãåå¾ã§ãã57 moveSlides();58 });59 window.addEventListener('resize', () => {60 moveSlides();61 })...
history.js
Source: history.js
...6 if (typeof undo !== "function" || typeof redo !== "function")7 throw new Error("Undo and Redo must be both functions");8 redoHistory = [];9 history.push({ undo, redo });10 updateButtons();11}12export function undo () {13 let undoed = history.pop();14 if (!undoed)15 return;16 redoHistory.push(undoed);17 undoed.undo();18}19export function redo () {20 let redoed = redoHistory.pop();21 if (!redoed)22 return;23 history.push(redoed);24 redoed.redo();25}26export function reset () {27 history = [];28 redoHistory = [];29 updateButtons();30}31function updateButtons () {32 undoButton.classList[history.length ? `remove` : `add`](`disabled`);33 redoButton.classList[redoHistory.length ? `remove` : `add`](`disabled`);34}35export function init () {36 undoButton = document.getElementById(`undoButton`);37 redoButton = document.getElementById(`redoButton`);38 undoButton.addEventListener(`click`, () => { undo(); updateButtons(); });39 redoButton.addEventListener(`click`, () => { redo(); updateButtons(); });40 updateButtons();...
Using AI Code Generation
1const puppeteer = require('puppeteer');2(async () => {3 const browser = await puppeteer.launch({headless: false});4 const page = await browser.newPage();5 await page.screenshot({path: 'example.png'});6 await page.click('input[name="q"]');7 await page.keyboard.type('Hello World');8 await page.keyboard.press('Enter');9 await page.waitForNavigation();10 await page.screenshot({path: 'example2.png'});11 await browser.close();12})();13const puppeteer = require('puppeteer');14(async () => {15 const browser = await puppeteer.launch({headless: false});16 const page = await browser.newPage();17 await page.screenshot({path: 'example.png'});18 await page.click('input[name="q"]');19 await page.keyboard.type('Hello World');20 await page.keyboard.press('Enter');21 await page.waitForNavigation();22 await page.screenshot({path: 'example2.png'});23 await browser.close();24})();25const puppeteer = require('puppeteer');26(async () => {27 const browser = await puppeteer.launch({headless: false});28 const page = await browser.newPage();29 await page.screenshot({path: 'example.png'});30 await page.click('input[name="q"]');31 await page.keyboard.type('Hello World');32 await page.keyboard.press('Enter');33 await page.waitForNavigation();34 await page.screenshot({path: 'example2.png'});35 await browser.close();36})();37const puppeteer = require('puppeteer');38(async () => {39 const browser = await puppeteer.launch({headless: false});40 const page = await browser.newPage();41 await page.screenshot({path: 'example.png'});42 await page.click('input[name="q"]');43 await page.keyboard.type('Hello World');44 await page.keyboard.press('Enter');45 await page.waitForNavigation();46 await page.screenshot({path: 'example2.png'});47 await browser.close();48})();
Using AI Code Generation
1const puppeteer = require('puppeteer');2(async () => {3 const browser = await puppeteer.launch();4 const page = await browser.newPage();5 await page.click('input[name="q"]');6 await page.keyboard.type('puppeteer');7 await page.keyboard.press('Enter');8 await page.waitForNavigation();9 await page.screenshot({ path: 'example.png' });10 await browser.close();11})();12const puppeteer = require('puppeteer');13(async () => {14 const browser = await puppeteer.launch();15 const page = await browser.newPage();16 await page.click('input[name="q"]');17 await page.keyboard.type('puppeteer');18 await page.keyboard.press('Enter');19 await page.waitForNavigation();20 await page.screenshot({ path: 'example.png' });21 await browser.close();22})();23const puppeteer = require('puppeteer');24(async () => {25 const browser = await puppeteer.launch();26 const page = await browser.newPage();27 await page.click('input[name="q"]');28 await page.keyboard.type('puppeteer');29 await page.keyboard.press('Enter');30 await page.waitForNavigation();31 await page.screenshot({ path: 'example.png' });32 await browser.close();33})();34const puppeteer = require('puppeteer');35(async () => {36 const browser = await puppeteer.launch();37 const page = await browser.newPage();38 await page.click('input[name="q"]');39 await page.keyboard.type('puppeteer');40 await page.keyboard.press('Enter');41 await page.waitForNavigation();
Using AI Code Generation
1const puppeteer = require('puppeteer');2(async () => {3 const browser = await puppeteer.launch();4 const page = await browser.newPage();5 await page.waitFor(1000);6 await page.evaluate(() => {7 document.querySelector('input[type="submit"]').click();8 });9 await page.waitFor(1000);10 await browser.close();11})();12const Nightmare = require('nightmare');13const nightmare = Nightmare({ show: true });14 .wait(1000)15 .evaluate(() => {16 document.querySelector('input[type="submit"]').click();17 })18 .wait(1000)19 .end()20 .then(() => {21 console.log('done');22 })23 .catch(error => {24 console.error('Search failed:', error);25 });26var casper = require('casper').create();27 this.waitForSelector('input[type="submit"]', function() {28 this.click('input[type="submit"]');29 });30});31casper.run();32var webdriver = require('selenium-webdriver'),33 until = webdriver.until;34var driver = new webdriver.Builder()35 .forBrowser('chrome')36 .build();37driver.wait(until.elementLocated(By.css('input[type="submit"]')), 10000);38driver.findElement(By.css('input[type="submit"]')).click();39driver.quit();40describe('angularjs homepage', function() {41 it('should greet the named user', function() {42 element(By.css('input[type="submit"]')).click();43 });44});45browser.click('input[type="submit"]');46import { Selector } from 'testcafe';47test('My first test
Using AI Code Generation
1const { PuppeteerCrawler } = require("apify");2const { log } = Apify.utils;3Apify.main(async () => {4 const requestList = new Apify.RequestList({5 });6 await requestList.initialize();7 const crawler = new PuppeteerCrawler({8 handlePageFunction: async ({ page, request }) => {9 await page.waitForSelector("button");10 await page.click("button");
Using AI Code Generation
1const puppeteer = require('puppeteer');2const puppeteerClass = require('./puppeteerClass');3(async () => {4 const browser = await puppeteer.launch();5 const page = await browser.newPage();6 await page.screenshot({path: 'example.png'});7 await browser.close();8})();9class Puppeteer {10 constructor() {11 this.puppeteer = require('puppeteer');12 }13 async updateButtons() {14 try {15 const browser = await this.puppeteer.launch();16 const page = await browser.newPage();17 await page.screenshot({path: 'example.png'});18 await browser.close();19 } catch (e) {20 console.log(e);21 }22 }23}24module.exports = Puppeteer;
Using AI Code Generation
1const puppeteer = require('puppeteer');2const puppeteerExtra = require('puppeteer-extra');3const pluginStealth = require('puppeteer-extra-plugin-stealth');4puppeteerExtra.use(pluginStealth());5async function run() {6 const browser = await puppeteerExtra.launch({ headless: false });7 const page = await browser.newPage();8 await page.waitForSelector('input[name="email"]');9 await page.type('input[name="email"]', 'email');10 await page.type('input[name="pass"]', 'password');11 await page.click('button[name="login"]');12 await page.waitForSelector('._1vp5');13 await page.evaluate(() => {14 document.querySelector('._1vp5').click();15 });16 await page.waitForSelector('._1vp5');17 await page.evaluate(() => {18 document.querySelector('._1vp5').click();19 });20 await page.waitForSelector('._1vp5');21 await page.evaluate(() => {22 document.querySelector('._1vp5').click();23 });24 await page.waitForSelector('._1vp5');25 await page.evaluate(() => {26 document.querySelector('._1vp5').click();27 });28 await page.waitForSelector('._1vp5');29 await page.evaluate(() => {30 document.querySelector('._1vp5').click();31 });32}33run();
Using AI Code Generation
1const { PuppeteerCrawler } = require('apify');2const puppeteer = require('puppeteer');3const { log } = Apify.utils;4Apify.main(async () => {5 const browser = await puppeteer.launch({6 });7 const crawler = new PuppeteerCrawler({8 handlePageFunction: async ({ page, request }) => {9 await crawler.updateButtons(page, request);10 },11 });12 await crawler.run();13 await browser.close();14});15## How to use the `updateCookies()` method16The `updateCookies()` method is used to update cookies in Puppeteer's `page` object. It accepts two arguments:17const { PuppeteerCrawler } = require('apify');18const puppeteer = require('puppeteer');19const { log } = Apify.utils;20Apify.main(async () => {21 const browser = await puppeteer.launch({22 });23 const crawler = new PuppeteerCrawler({24 handlePageFunction: async ({ page, request }) => {25 await crawler.updateCookies(page, request);26 },27 });28 await crawler.run();29 await browser.close();30});31## How to use the `updateHeaders()` method32The `updateHeaders()` method is used to update headers in Puppeteer's `page` object. It accepts two arguments:33const { PuppeteerCrawler } = require('apify');34const puppeteer = require('puppeteer');35const { log } = Apify.utils;36Apify.main(async ()
Using AI Code Generation
1const { PuppeteerCrawler } = require('apify');2const crawler = new PuppeteerCrawler({3 handlePageFunction: async ({ page, request }) => {4 await page.waitForSelector('.button');5 await page.evaluate(() => {6 updateButtons();7 });8 },9});10### `updateInputs()`11const { PuppeteerCrawler } = require('apify');12const crawler = new PuppeteerCrawler({13 handlePageFunction: async ({ page, request }) => {14 await page.waitForSelector('.button');15 await page.evaluate(() => {16 updateInputs();17 });18 },19});20### `updateSelects()`21const { PuppeteerCrawler } = require('apify');22const crawler = new PuppeteerCrawler({23 handlePageFunction: async ({ page, request }) => {24 await page.waitForSelector('.button');25 await page.evaluate(() => {26 updateSelects();27 });28 },29});30### `updateTextareas()`31const { PuppeteerCrawler } = require('apify');32const crawler = new PuppeteerCrawler({33 handlePageFunction: async ({ page, request }) => {34 await page.waitForSelector('.button');35 await page.evaluate(() => {36 updateTextareas();37 });
Using AI Code Generation
1const puppeteer = require('puppeteer');2(async () => {3 const browser = await puppeteer.launch();4 const page = await browser.newPage();5 await page.addScriptTag({path: './updateButtons.js'});6 await page.evaluate(() => {7 updateButtons();8 });9 await page.screenshot({path: 'example.png'});10 await browser.close();11})();12function updateButtons() {13 var buttons = document.getElementsByTagName('button');14 for (var i = 0; i < buttons.length; i++) {15 buttons[i].textContent = 'Click Me';16 buttons[i].className = 'btn btn-primary';17 }18}19const puppeteer = require('puppeteer');20(async () => {21 const browser = await puppeteer.launch();22 const page = await browser.newPage();23 await page.screenshot({path: 'example
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I strongly advise against evaluating or parsing crawled data in Node.js if you are anyway using puppeteer for crawling. When you are using puppeteer you already have a browser with a great sandbox for JavaScript code running in another process. Why risk that kind of isolation and "rebuild" a parser in your Node.js script? If your Node.js script breaks, your whole script will fail. In the worst case, you might even expose your machine to serious risks when you try to run untrusted code inside your main thread.
Instead, try to do as much parsing as possible inside the context of the page. You can even do an evil eval
call there. There worst that could happen? Your browser hangs or crashes.
Imagine the following HTML page (very much simplified). You are trying to read the text which is pushed into an array. The only information you have is that there is an additional attribute id
which is set to target-data
.
<html>
<body>
<!--- ... -->
<script>
var arr = [];
// some complex code...
arr.push({
id: 'not-interesting-data',
data: 'some data you do not want to crawl',
});
// more complex code here...
arr.push({
id: 'target-data',
data: 'THIS IS THE DATA YOU WANT TO CRAWL', // <---- You want to get this text
});
// more code...
arr.push({
id: 'some-irrelevant-data',
data: 'again, you do not want to crawl this',
});
</script>
<!--- ... -->
</body>
</html>
Here is a simple example what your code might look like right now:
await page.goto('http://...');
const crawledJsCode = await page.evaluate(() => document.querySelector('script').innerHTML);
In this example, the script extracts the JavaScript code from the page. Now we have the JavaScript code from the page and we "only" need to parse it, right? Well, this is the wrong approach. Don't try to rebuild a parser inside Node.js. Just use the browser. There are basically two approaches you can take to do that in your case.
JSON.parse
, a regex or eval
(eval only if really necessary)In this approach you are replacing native browser functions with your own "fake functions". Example:
const originalPush = Array.prototype.push;
Array.prototype.push = function (item) {
if (item && item.id === 'target-data') {
const data = item.data; // This is the data we are trying to crawl
window.exposedDataFoundFunction(data); // send this data back to Node.js
}
originalPush.apply(this, arguments);
}
This code replaces the original Array.prototype.push
function with our own function. Everything works as normal, but when an item with our target id is pushed into an array, a special condition is triggered. To inject this function into the page, you could use page.evaluateOnNewDocument
. To receive the data from Node.js you would have to expose a function to the browser via page.exposeFunction
:
// called via window.dataFound from within the fake Array.prototype.push function
await page.exposeFunction('exposedDataFoundFunction', data => {
// handle the data in Node.js
});
Now it doesn't really matter how complex the code of the page is, whether it happens inside some asynchronous handler or whether the page changes the surrounding code. As long as the target data is pushing the data into an array, we will get it.
You can use this approach for a lot of crawling. Check how the data is processed and replace the low level functions processing the data with your own proxy version of it.
Let's assume the first approach does not work for some reason. The data is in some script tag, but you are not able to get it by using fake functions.
Then you should parse the data, but not inside your Node.js environment. Do it inside the page context. You could run a regular expression or use JSON.parse
. But do it before returning the data back to Node.js. This approach has the benefit that if your code will crash your environment for some reason, it will not be your main script, but just your browser that crashes.
To give some example code. Instead of running the code from the original "bad code" sample, we change it to this:
const crawledJsCode = await page.evaluate(() => {
const code = document.querySelector('script').innerHTML; // instead of returning this
const match = code.match(/some tricky regex which extracts the data you want/); // we run our regex in the browser
return match; // and only return the results
});
This will only return the parts of the code we need, which can then be fruther processed from within Node.js.
Independent of which approach you choose, both ways are much better and more secure than running unknown code inside your main thread. If you absolutely have to process the data in your Node.js environment, use a regular expression for it like shown in the answer from trincot. You should never use eval to run untrusted code.
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