木偶- iFrame内的链接

Question

我必须将广告链接放在此页的要点下面。

我正在尝试木偶，但我有麻烦，因为广告是一个iframe！

我可以使用Chrome控制台成功地获得我所需要的：

document.querySelector('#adContainer a').href

Puppetter

const puppeteer = require('puppeteer');

(async () => {
  const browser = await puppeteer.launch();
  const page = await browser.newPage();
  page.setViewport({width: 1440, height: 1000})
  await page.goto('https://www.amazon.co.uk/dp/B07DDDB34D', {waitUntil: 'networkidle2'})

  await page.waitFor(2500);

  const elementHandle = await page.$eval('#adContainer a', el => el.href);

  console.log(elementHandle);
  await page.screenshot({path: 'example.png', fullPage: false});

  await browser.close();
})();

错误:错误:找不到元素匹配选择器"#adContainer“

​

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编辑：

const browser = await puppeteer.launch();
  const page = await browser.newPage();
  page.setViewport({width: 1440, height: 1000})
  await page.goto('https://www.amazon.co.uk/dp/B07DDDB34D', {waitUntil: 'networkidle2'})

const adFrame = page.frames().find(frame => frame.name().includes('"adServer":"cs'))
const urlSelector = '#sp_hqp_shared_inner > div > a';
const url = await adFrame.$eval(urlSelector, element => element.textContent);
console.log(url);


  await browser.close();

Run：https://try-puppeteer.appspot.com/

Answer 1

您需要在框架内部执行该查询，该查询可以通过page.frames()访问。

const adFrame = page.frames().find(frame => frame.name().includes('<some text only appearing in name of this iFrame>');
const urlSelector = '#sp_hqp_shared_inner > div > a';
const url = await adFrame.$eval(urlSelector, element => element.textContent);
console.log(url);

我是怎么得到那个网址的选择器的：

​

Discaimer我自己也没试过。另外，我认为在iFrame中获取url的适当方法是类似于这。

const url = await adFrame.evaluate((sel) => {
  return document.querySelectorAll(sel)[0].href;
}, urlSelector);

Answer 2

每次加载页面时，您都必须切换到要处理的框架。

async getRequiredLink() {
    return await this.page.evaluate(() => {
        let iframe = document.getElementById('frame_id'); //pass id of your frame
        let doc = iframe.contentDocument; // changing the context to the working frame
        let ele = doc.querySelector('you-selector'); // selecting the required element
        return ele.href;
    });
}