javascript - Puppeteer:找不到选择器的节点 - iframe 中的登录模式

Question

我想转到登录页面，单击用户名，然后输入用户名。

这是我目前所拥有的:

const puppeteer = require('puppeteer');

(async () => {
    const browser = await puppeteer.launch({ headless: false, slowMo: 200 });
    const page = await browser.newPage();
    await page.goto('https://fantasy.espn.com/basketball/team');
    await page.waitFor(2000);
    await page.click('#did-ui-view > div > section > section > form > section > div:nth-child(1) > div > label > span.input-wrapper > input');
    await page.waitFor(2000);
    await page.type('#did-ui-view > div > section > section > form > section > div:nth-child(1) > div > label > span.input-wrapper > input', 'hello', { delay: 100 });  
    await browser.close()
})();

我继续收到此错误:

 Error: No node found for selector: #did-ui-view > div > section > section > form > section > div:nth-child(1) > div > label > span.input-wrapper > input

我不明白；当我这样做时，控制台中的 document.querySelector 会返回输入；为什么找不到那个节点？

Answer 1

元素在 iframe 中。所以首先您需要获取框架，然后从该框架中选择元素。你通常会这样做:

let iframeHandle = await page.$('#disneyid-iframe');
let frame = await iframeHandle.contentFrame();
let inputElement = await frame.waitForSelector('#did-ui-view > div > section > section > form > section > div:nth-child(1) > div > label > span.input-wrapper > input')
await inputElement.type('hello', { delay: 100 });

但是，进程外框架存在问题，因此您需要使用 --disable-features=site-per-process 启动 chromium。以下应该有效:

const browser = await puppeteer.launch({headless: false, args: ['--disable-features=site-per-process']});
const page = await browser.newPage();
await page.goto('https://fantasy.espn.com/basketball/team', {waitUntil: ['load', 'domcontentloaded','networkidle0']});
await page.waitFor(5000);
let iframeHandle = await page.$('#disneyid-iframe');
let frame = await iframeHandle.contentFrame();
let inputElement = await frame.waitForSelector('#did-ui-view > div > section > section > form > section > div:nth-child(1) > div > label > span.input-wrapper > input')
await inputElement.type('hello', { delay: 100 });