Puppeteer: How to handle multiple tabs?

Question

Scenario: Web form for developer app registration with two part workflow.

Page 1: Fill out developer app details and click on button to create Application ID, which opens, in a new tab...

Page 2: The App ID page. I need to copy the App ID from this page, then close the tab and go back to Page 1 and fill in the App ID (saved from Page 2), then submit the form.

I understand basic usage - how to open Page 1 and click the button which opens Page 2 - but how do I get a handle on Page 2 when it opens in a new tab?

Example:

const puppeteer = require('puppeteer');

(async() => {
    const browser = await puppeteer.launch({headless: false, executablePath: '/Applications/Google Chrome.app'});
    const page = await browser.newPage();

    // go to the new bot registration page
    await page.goto('https://register.example.com/new', {waitUntil: 'networkidle'});

    // fill in the form info
    const form = await page.$('new-app-form');

    await page.focus('#input-appName');
    await page.type('App name here');

    await page.focus('#input-appDescription');
    await page.type('short description of app here');

    await page.click('.get-appId'); //opens new tab with Page 2

    // handle Page 2
    // get appID from Page 2
    // close Page 2

    // go back to Page 1
    await page.focus('#input-appId');
    await page.type(appIdSavedFromPage2);

    // submit the form
    await form.evaluate(form => form.submit());

    browser.close();
})();

Update 2017-10-25

• The work for Browser.pages has been completed and merged
• Fixes Emit new Page objects when new tabs created #386 and Request: browser.currentPage() or similar way to access Pages #443.

Still looking for a good usage example.

Answer 1

A new patch has been committed two days ago and now you can use browser.pages() to access all Pages in current browser. Works fine, tried myself yesterday :)

Edit:

An example how to get a JSON value of a new page opened as 'target: _blank' link.

const page = await browser.newPage();
await page.goto(url, {waitUntil: 'load'});

// click on a 'target:_blank' link
await page.click(someATag);

// get all the currently open pages as an array
let pages = await browser.pages();

// get the last element of the array (third in my case) and do some 
// hucus-pocus to get it as JSON...
const aHandle = await pages[3].evaluateHandle(() => document.body);

const resultHandle = await pages[3].evaluateHandle(body => 
  body.innerHTML, aHandle);

// get the JSON value of the page.
let jsonValue = await resultHandle.jsonValue();

// ...do something with JSON