Puppeteer：如何提交表单？

Question

Using puppeteer , how could you programmatically submit a form? So far I've been able to do this using page.click('.input[type="submit"]') if the form actually includes a submit input. But for forms that don't include a submit input, focusing on the form text input element and using page.press('Enter') doesn't seem to actually cause the form to submit:

const puppeteer = require('puppeteer');

(async() => {

    const browser = await puppeteer.launch();
    const page = await browser.newPage();
    await page.goto('https://stackoverflow.com/', {waitUntil: 'load'});
    console.log(page.url());

    // Type our query into the search bar
    await page.focus('.js-search-field');
    await page.type('puppeteer');

    // Submit form
    await page.press('Enter');

    // Wait for search results page to load
    await page.waitForNavigation({waitUntil: 'load'});


    console.log('FOUND!', page.url());

    // Extract the results from the page
    const links = await page.evaluate(() => {
      const anchors = Array.from(document.querySelectorAll('.result-link a'));
      return anchors.map(anchor => anchor.textContent);
    });
    console.log(links.join('\n'));
    browser.close();

})();

Answer 1

Try this

const form = await page.$('form-selector');
await form.evaluate(form => form.submit());

---

For v0.11.0 and laters:

await page.$eval('form-selector', form => form.submit());

Answer 2

If you are attempting to fill out and submit a login form , you can use the following:

await page.goto('https://www.example.com/login');

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

await page.click('#submit');

await page.waitForNavigation();

console.log('New Page URL:', page.url());

Answer 3

I was scraping a SPA, and I had to use waitForNetworkIdle since the form submit was not triggering a page navigation event. Instead it submitted data to the server, and updated the DOM of the page which was already loaded.

const [response] = await Promise.all([        
    page.waitForNetworkIdle(),
    page.click('#form-submit-button'),
]);

When to use waitForNetworkIdle

I suspect that if you open a normal web browser, submit the form, and look to see if the page URL has changed or not. If it has not changed, you should use waitForNetworkIdle .

Also, take this advice with a grain of salt, I've only been using puppeteer for an hour.