Puppeteer：未找到选择器的节点 - iframe 中的登录模式

Question

I want to go to the login page, click on the username, and type in the username.

This is what I have so far:

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()
})();

I continue to get this error:

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

I don't get it; when I do, document.querySelector in the console with that path, I'm returned the input; why is it not able to find that node?

Answer 1

the element is in an iframe. so first you need to get the frame and then select the element from that frame. You would typically do:

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 });

However, there is an issue with out-of-process frames, so you need to launch chromium with --disable-features=site-per-process . The following should work:

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 });