Puppeteer wait until page is completely loaded

问题

I am working on creating PDF from web page.

The application on which I am working is single page application.

I tried many options and suggestion on https://github.com/GoogleChrome/puppeteer/issues/1412

But it is not working

    const browser = await puppeteer.launch({
    executablePath: 'C:\\Program Files (x86)\\Google\\Chrome\\Application\\chrome.exe',
    ignoreHTTPSErrors: true,
    headless: true,
    devtools: false,
    args: ['--no-sandbox', '--disable-setuid-sandbox']
});

const page = await browser.newPage();

await page.goto(fullUrl, {
    waitUntil: 'networkidle2'
});

await page.type('#username', 'scott');
await page.type('#password', 'tiger');

await page.click('#Login_Button');
await page.waitFor(2000);

await page.pdf({
    path: outputFileName,
    displayHeaderFooter: true,
    headerTemplate: '',
    footerTemplate: '',
    printBackground: true,
    format: 'A4'
});

What I want is to generate PDF report as soon as Page is loaded completely.

I don't want to write any type of delays i.e. await page.waitFor(2000);

I can not do waitForSelector because the page has charts and graphs which are rendered after calculations.

Help will be appreciated.

回答1:

You can use page.waitForNavigation() to wait for the new page to load completely before generating a PDF:

await page.goto(fullUrl, {
  waitUntil: 'networkidle0',
});

await page.type('#username', 'scott');
await page.type('#password', 'tiger');

await page.click('#Login_Button');

await page.waitForNavigation({
  waitUntil: 'networkidle0',
});

await page.pdf({
  path: outputFileName,
  displayHeaderFooter: true,
  headerTemplate: '',
  footerTemplate: '',
  printBackground: true,
  format: 'A4',
});

If there is a certain element that is generated dynamically that you would like included in your PDF, consider using page.waitForSelector() to ensure that the content is visible:

await page.waitForSelector('#example', {
  visible: true,
});

回答2:

I always like to wait for selectors, as many of them are a great indicator that the page has fully loaded:

await page.waitForSelector('#blue-button');

回答3:

In some cases, the best solution for me was:

await page.goto(url, { waitUntil: 'domcontentloaded' });

回答4:

Wrap the page.click and page.waitForNavigation in a Promise.all

  await Promise.all([
    page.click('#submit_button'),
    page.waitForNavigation({ waitUntil: 'networkidle0' })
  ]);

来源：https://stackoverflow.com/questions/52497252/puppeteer-wait-until-page-is-completely-loaded

标签

pdf-generation

Puppeteer

google-chrome-headless