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bd898b7f56
puppeteer/docs/api.md
Andrey Lushnikov bd898b7f56 Implement function as a part of a page.waitFor shortcut 
This patch adds a function as a possible argument to
page.waitFor shortcut.

Fixes #91.
2017-07-27 17:09:28 -07:00

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Puppeteer API

Table of Contents

Puppeteer

Puppeteer is a Node library which provides a high-level API to control Chromium over the DevTools Protocol.

Puppeteer provides a top-level require which has a Browser class. The following is a typical example of using a Browser class to drive automation:

const {Browser} = require('puppeteer');
const browser = new Browser();
browser.newPage().then(async page => {
  await page.navigate('https://google.com');
  // other actions...
  browser.close();
});

Emulation

Puppeteer supports device emulation with two primitives:

To aid emulation, puppeteer provides a list of device descriptors which could be obtained via the require('puppeteer/DeviceDescriptors') command. Below is an example of emulating iPhone 6 in puppeteer:

const {Browser} = require('puppeteer');
const devices = require('puppeteer/DeviceDescriptors');
const iPhone = devices['iPhone 6'];
const browser = new Browser();
browser.newPage().then(async page => {
  await Promise.all([
    page.setUserAgent(iPhone.userAgent),
    page.setViewport(iPhone.viewport)
  ]);
  await page.navigate('https://google.com');
  // other actions...
  browser.close();
});

List of all available devices is available in the source code: DeviceDescriptors.js.

class: Browser

Browser manages a browser instance, creating it with a predefined settings, opening and closing pages. Instantiating Browser class does not necessarily result in launching browser; the instance will be launched when the need will arise.

A typical scenario of using Browser is opening a new page and navigating it to a desired URL:

const {Browser} = require('puppeteer');
const browser = new Browser();
browser.newPage().then(async page => {
  await page.navigate('https://example.com');
  browser.close();
})

new Browser([options])

  • options <Object> Set of configurable options to set on the browser. Can have the following fields:
    • headless <boolean> Wether to run chromium in headless mode. Defaults to true.
    • executablePath <string> Path to a chromium executable to run instead of bundled chromium.
    • args <Array<string>> Additional arguments to pass to the chromium instance. List of chromium flags could be found here.

browser.close()

Closes browser with all the pages (if any were opened). The browser object itself is considered to be disposed and could not be used anymore.

browser.newPage()

browser.stderr

A Readable Stream that represents the browser process's stderr. For example, stderr could be piped into process.stderr:

const {Browser} = require('puppeteer');
const browser = new Browser();
browser.stderr.pipe(process.stderr);
browser.version().then(version => {
  console.log(version);
  browser.close();
});

browser.stdout

A Readable Stream that represents the browser process's stdout. For example, stdout could be piped into process.stdout:

const {Browser} = require('puppeteer');
const browser = new Browser();
browser.stdout.pipe(process.stdout);
browser.version().then(version => {
  console.log(version);
  browser.close();
});

browser.version()

  • returns: <Promise<string>> String describing browser version. For headless chromium, this is similar to HeadlessChrome/61.0.3153.0. For non-headless, this is Chrome/61.0.3153.0.

Note

the format of browser.version() is not fixed and might change with future releases of the library.

class: Page

Page provides methods to interact with browser page. Page could be thought about as a browser tab, so one Browser instance might have multiple Page instances.

An example of creating a page, navigating it to a URL and saving screenshot as screenshot.png:

const {Browser} = require('puppeteer');
const browser = new Browser();
browser.newPage().then(async page =>
  await page.navigate('https://example.com');
  await page.screenshot({path: 'screenshot.png'});
  browser.close();
});

event: 'console'

Emitted when a page calls one of console API methods, e.g. console.log or console.dir.

If multiple arguments are passed over to the console API call, these arguments are dispatched in an event.

An example of handling console event:

page.on('console', (...args) => {
  for (let i =0; i < args.length; ++i)
    console.log(`${i}: ${args[i]}`);
});
page.evaluate(() => console.log(5, 'hello', {foo: 'bar'}));

event: 'dialog'

Emitted when a javascript dialog, such as alert, prompt, confirm or beforeunload, gets opened on the page. Puppeteer can take action to the dialog via dialog's accept or dismiss methods.

event: 'frameattached'

Emitted when a frame gets attached.

event: 'framedetached'

Emitted when a frame gets detached.

event: 'framenavigated'

Emitted when a frame committed navigation.

event: 'load'

Emitted when a page's load event was dispatched.

event: 'pageerror'

Emitted when an unhandled exception happens on the page. The only argument of the event holds the exception message.

event: 'request'

Emitted when a page issues a request. The request object is a read-only object. In order to intercept and mutate requests, see page.setRequestInterceptor

event: 'requestfailed'

Emitted when a request is failed.

event: 'requestfinished'

Emitted when a request is successfully finished.

event: 'response'

Emitted when a response is received.

page.$(selector, pageFunction, ...args)

  • selector <string> A selector to be matched in the page
  • pageFunction <function(Element)> Function to be evaluated in-page with first element matching selector
  • ...args <...string> Arguments to pass to pageFunction
  • returns: <Promise<Object>> Promise which resolves to function return value.

Example:

const outerhtml = await page.$('#box', e => e.outerHTML);

Shortcut for page.mainFrame().$(selector, pageFunction, ...args).

page.$$(selector, pageFunction, ...args)

  • selector <string> A selector to be matched in the page
  • pageFunction <function(Element)> Function to be evaluated in-page for every matching element.
  • ...args <...string> Arguments to pass to pageFunction
  • returns: <Promise<Array<Object>>> Promise which resolves to array of function return values.

Example:

const headings = await page.$$('h1,h2,h3,h4', el => el.textContent);
for (const heading of headings) console.log(heading);

Shortcut for page.mainFrame().$$(selector, pageFunction, ...args).

page.addScriptTag(url)

  • url <string> Url of a script to be added
  • returns: <Promise> Promise which resolves as the script gets added and loads.

Adds a <script></script> tag to the page with the desired url. Alternatively, javascript could be injected to the page via page.injectFile method.

page.click(selector[, options])

  • selector <string> A query selector to search for element to click. If there are multiple elements satisfying the selector, the first will be clicked.
  • options <Object>
    • button <string> left, right, or middle, defaults to left.
    • clickCount <number> defaults to 1
  • returns: <Promise> Promise which resolves when the element matching selector is successfully clicked. Promise gets rejected if there's no element matching selector.

page.close()

  • returns: <Promise> Returns promise which resolves when page gets closed.

page.evaluate(pageFunction, ...args)

  • pageFunction <function|string> Function to be evaluated in browser context
  • ...args <...string> Arguments to pass to pageFunction
  • returns: <Promise<Object>> Promise which resolves to function return value

If the function, passed to the page.evaluate, returns a Promise, then page.evaluate would wait for the promise to resolve and return it's value.

const {Browser} = require('puppeteer');
const browser = new Browser();
browser.newPage().then(async page =>
  const result = await page.evaluate(() => {
    return Promise.resolve().then(() => 8 * 7);
  });
  console.log(result); // prints "56"
  browser.close();
});

A string can also be passed in instead of a function.

console.log(await page.evaluate('1 + 2')); // prints "3"

This is a shortcut for page.mainFrame().evaluate() method.

page.evaluateOnNewDocument(pageFunction, ...args)

  • pageFunction <function|string> Function to be evaluated in browser context
  • ...args <...string> Arguments to pass to pageFunction
  • returns: <Promise<Object>> Promise which resolves to function

Adds a function which would be invoked in one of the following scenarios:

  • whenever the page gets navigated
  • whenever the child frame gets attached or navigated. In this case, the function gets invoked in the context of the newly attached frame

The function is invoked after the document was created but before any of its scripts were run. This is useful to amend javascript environment, e.g. to seed Math.random

page.focus(selector)

  • selector <string> A query selector of element to focus. If there are multiple elements satisfying the selector, the first will be focused.
  • returns: <Promise> Promise which resolves when the element matching selector is successfully focused. Promise gets rejected if there's no element matching selector.

page.frames()

  • returns: <Array<Frame>> An array of all frames attached to the page.

page.goBack(options)

  • options <Object> Navigation parameters which might have the following properties:
    • timeout <number> Maximum navigation time in milliseconds, defaults to 30 seconds.
    • waitUntil <string> When to consider navigation succeeded, defaults to load. Could be either:
      • load - consider navigation to be finished when the load event is fired.
      • networkidle - consider navigation to be finished when the network activity stays "idle" for at least networkIdleTimeoutms.
    • networkIdleInflight <number> Maximum amount of inflight requests which are considered "idle". Takes effect only with waitUntil: 'networkidle' parameter.
    • networkIdleTimeout <number> A timeout to wait before completing navigation. Takes effect only with waitUntil: 'networkidle' parameter.
  • returns: <Promise<Response>> Promise which resolves to the main resource response. In case of multiple redirects, the navigation will resolve with the response of the last redirect. If can not go back, resolves to null.

Navigate to the previous page in history.

page.goForward(options)

  • options <Object> Navigation parameters which might have the following properties:
    • timeout <number> Maximum navigation time in milliseconds, defaults to 30 seconds.
    • waitUntil <string> When to consider navigation succeeded, defaults to load. Could be either:
      • load - consider navigation to be finished when the load event is fired.
      • networkidle - consider navigation to be finished when the network activity stays "idle" for at least networkIdleTimeoutms.
    • networkIdleInflight <number> Maximum amount of inflight requests which are considered "idle". Takes effect only with waitUntil: 'networkidle' parameter.
    • networkIdleTimeout <number> A timeout to wait before completing navigation. Takes effect only with waitUntil: 'networkidle' parameter.
  • returns: <Promise<Response>> Promise which resolves to the main resource response. In case of multiple redirects, the navigation will resolve with the response of the last redirect. If can not go back, resolves to null.

Navigate to the next page in history.

page.hover(selector)

  • selector <string> A query selector to search for element to hover. If there are multiple elements satisfying the selector, the first will be hovered.
  • returns: <Promise> Promise which resolves when the element matching selector is successfully hovered. Promise gets rejected if there's no element matching selector.

page.injectFile(filePath)

  • filePath <string> Path to the javascript file to be injected into page.
  • returns: <Promise> Promise which resolves when file gets successfully evaluated in page.

page.keyboard

page.mainFrame()

  • returns: <Frame> returns page's main frame.

Page is guaranteed to have a main frame which persists during navigations.

page.mouse

page.navigate(url, options)

  • url <string> URL to navigate page to
  • options <Object> Navigation parameters which might have the following properties:
    • timeout <number> Maximum navigation time in milliseconds, defaults to 30 seconds.
    • waitUntil <string> When to consider navigation succeeded, defaults to load. Could be either:
      • load - consider navigation to be finished when the load event is fired.
      • networkidle - consider navigation to be finished when the network activity stays "idle" for at least networkIdleTimeoutms.
    • networkIdleInflight <number> Maximum amount of inflight requests which are considered "idle". Takes effect only with waitUntil: 'networkidle' parameter.
    • networkIdleTimeout <number> A timeout to wait before completing navigation. Takes effect only with waitUntil: 'networkidle' parameter.
  • returns: <Promise<Response>> Promise which resolves to the main resource response. In case of multiple redirects, the navigation will resolve with the response of the last redirect.

The page.navigate will throw an error if:

  • there's an SSL error (e.g. in case of self-signed certificates).
  • target URL is invalid.
  • the timeout is exceeded during navigation.

page.pdf(options)

  • options <Object> Options object which might have the following properties:
    • path <string> The file path to save the PDF to.
    • scale <number> Scale of the webpage rendering. Defaults to 1.
    • displayHeaderFooter <boolean> Display header and footer. Defaults to false.
    • printBackground <boolean> Print background graphics. Defaults to false.
    • landscape <boolean> Paper orientation. Defaults to false.
    • pageRanges <string> Paper ranges to print, e.g., '1-5, 8, 11-13'. Defaults to the empty string, which means print all pages.
    • format <string> Paper format. If set, takes priority over width or height options. Defaults to 'Letter'.
    • width <string> Paper width, accepts values labeled with units.
    • height <string> Paper height, accepts values labeled with units.
    • margin <Object> Paper margins, defaults to none.
      • top <string> Top margin, accepts values labeled with units.
      • right <string> Right margin, accepts values labeled with units.
      • bottom <string> Bottom margin, accepts values labeled with units.
      • left <string> Left margin, accepts values labeled with units.
  • returns: <Promise<Buffer>> Promise which resolves with PDF buffer.

The width, height, and margin options accept values labeled with units. Unlabeled values are treated as pixels.

A few examples:

  • page.pdf({width: 100}) - prints with width set to 100 pixels
  • page.pdf({width: '100px'}) - prints with width set to 100 pixels
  • page.pdf({width: '10cm'}) - prints with width set to 10 centimeters.

All possible units are:

  • px - pixel
  • in - inch
  • cm - centimeter
  • mm - millimeter

The format options are:

  • Letter: 8.5in x 11in
  • Legal: 8.5in x 14in
  • Tabloid: 11in x 17in
  • Ledger: 17in x 11in
  • A0: 33.1in x 46.8in
  • A1: 23.4in x 33.1in
  • A2: 16.5in x 23.4in
  • A3: 11.7in x 16.5in
  • A4: 8.27in x 11.7in
  • A5: 5.83in x 8.27in

Note

Generating a pdf is currently only supported in Chrome headless.

page.plainText()

page.press(key[, options])

Shortcut for keyboard.down and keyboard.up.

page.reload(options)

  • options <Object> Navigation parameters which might have the following properties:
    • timeout <number> Maximum navigation time in milliseconds, defaults to 30 seconds.
    • waitUntil <string> When to consider navigation succeeded, defaults to load. Could be either:
      • load - consider navigation to be finished when the load event is fired.
      • networkidle - consider navigation to be finished when the network activity stays "idle" for at least networkIdleTimeoutms.
    • networkIdleInflight <number> Maximum amount of inflight requests which are considered "idle". Takes effect only with waitUntil: 'networkidle' parameter.
    • networkIdleTimeout <number> A timeout to wait before completing navigation. Takes effect only with waitUntil: 'networkidle' parameter.
  • returns: <Promise<Response>> Promise which resolves to the main resource response. In case of multiple redirects, the navigation will resolve with the response of the last redirect.

page.screenshot([options])

  • options <Object> Options object which might have the following properties:
    • path <string> The file path to save the image to. The screenshot type will be inferred from file extension.
    • type <string> Specify screenshot type, could be either jpeg or png. Defaults to 'png'.
    • quality <number> The quality of the image, between 0-100. Not applicable to png images.
    • fullPage <boolean> When true, takes a screenshot of the full scrollable page. Defaults to false.
    • clip <Object> An object which specifies clipping region of the page. Should have the following fields:
      • x <number> x-coordinate of top-left corner of clip area
      • y <number> y-coordinate of top-left corner of clip area
      • width <number> width of clipping area
      • height <number> height of clipping area
  • returns: <Promise<Buffer>> Promise which resolves to buffer with captured screenshot

page.setContent(html)

  • html <string> HTML markup to assign to the page.
  • returns: <Promise> Promise which resolves when the content is successfully assigned.

page.setExtraHTTPHeaders(headers)

  • headers <Map> A map of additional http headers to be sent with every request.
  • returns: <Promise> Promise which resolves when additional headers are installed

The extra HTTP headers will be sent with every request the page initiates.

Note

page.setExtraHTTPHeaders does not guarantee the order of headers in the outgoing requests.

page.setInPageCallback(name, callback)

  • name <string> Name of the callback to be assigned on window object
  • callback <function> Callback function which will be called in puppeteer's context.
  • returns: <Promise> Promise which resolves when callback is successfully initialized

The in-page callback allows page to asynchronously reach back to the Puppeteer. An example of a page showing amount of CPU's:

const os = require('os');
const {Browser} = require('puppeteer');
const browser = new Browser();

browser.newPage().then(async page =>
  await page.setInPageCallback('getCPUCount', () => os.cpus().length);
  await page.evaluate(async () => {
    alert(await window.getCPUCount());
  });
  browser.close();
});

page.setRequestInterceptor(interceptor)

  • interceptor <function> Callback function which accepts a single argument of type <InterceptedRequest>.
  • returns: <Promise> Promise which resolves when request interceptor is successfully installed on the page.

After the request interceptor is installed on the page, every request will be reported to the interceptor. The InterceptedRequest could be modified and then either continued via the continue() method, or aborted via the abort() method.

En example of a naive request interceptor which aborts all image requests:

const {Browser} = require('puppeteer');
const browser = new Browser();

browser.newPage().then(async page =>
  await page.setRequestInterceptor(interceptedRequest => {
    if (interceptedRequest.url.endsWith('.png') || interceptedRequest.url.endsWith('.jpg'))
      interceptedRequest.abort();
    else
      interceptedRequest.continue();
  });
  await page.navigate('https://example.com');
  browser.close();
});

page.setUserAgent(userAgent)

  • userAgent <string> Specific user agent to use in this page
  • returns: <Promise> Promise which resolves when the user agent is set.

page.setViewport(viewport)

  • viewport <Object> An object with two fields:
    • width <number> Specify page's width in pixels.
    • height <number> Specify page's height in pixels.
    • deviceScaleFactor <number> Specify device scale factor (could be though of as dpr). Defaults to 1.
    • isMobile <boolean> Weather the meta viewport tag is taken into account. Defaults to false.
    • hasTouch<boolean> Specify if viewport supports touch events. Defaults to false
    • isLandscape <boolean> Specify if viewport is in the landscape mode. Defaults to false.
  • returns: <Promise> Promise which resolves when the dimensions are updated.

Note

in certain cases, setting viewport will reload the page so that the isMobile or hasTouch options will be able to interfere in project loading.

The page's viewport size defines page's dimensions, observable from page via window.innerWidth / window.innerHeight. The viewport size defines a size of page screenshot (unless a fullPage option is given).

In case of multiple pages in one browser, each page can have its own viewport size.

page.title()

page.type(text)

  • text <string> A text to type into a focused element.
  • returns: <Promise> Promise which resolves when the text has been successfully typed.

Sends a keydown, keypress/input, and keyup event for each character in the text.

To press a special key, use page.press.

page.uploadFile(selector, ...filePaths)

  • selector <string> A query selector to a file input
  • ...filePaths <string> Sets the value of the file input these paths
  • returns: <Promise> Promise which resolves when the value is set.

page.url()

  • returns: <string> Current page url.

This is a shortcut for page.mainFrame().url()

page.viewport()

page.waitFor(selectorOrFunctionOrTimeout[, options])

This is a shortcut method for frame.waitForSelector or page.mainFrame().waitForFunction().

This method behaves differently with respect to the type of the first parameter:

  • if selectorOrFunctionOrTimeout is a string, than the first argument is treated as a selector to wait for and the method is a shortcut for frame.waitForSelector
  • if selectorOrFunctionOrTimeout is a function, than the first argument is treated as a predicate to wait for and the method is a shortcut for frame.waitForFunction().
  • if selectorOrFunctionOrTimeout is a number, than the first argument is treated as a timeout in milliseconds and the method returns a promise which resolves after the timeout
  • otherwise, an exception is thrown

The method is a shortcut for page.mainFrame().waitFor().

page.waitForFunction(pageFunction[, options], ...args)

  • pageFunction <function|string> Function to be evaluated in browser context
  • options <Object> Optional waiting parameters
    • polling <string|number> An interval at which the pageFunction is executed, defaults to raf. If polling is a number, then it is treated as an interval in milliseconds at which the function would be executed. If polling is a string, then it could be one of the following values:
      • raf - to constantly execute pageFunction in requestAnimationFrame callback. This is the tightest polling mode which is suitable to observe styling changes.
      • mutation - to execute pageFunction on every DOM mutation.
    • timeout <number> maximum time to wait for in milliseconds. Defaults to 30000 (30 seconds).
  • ...args <...Object> Arguments to pass to pageFunction
  • returns: <Promise> Promise which resolves when element specified by selector string is added to DOM.

Shortcut for page.mainFrame().waitForFunction().

page.waitForNavigation(options)

  • options <Object> Navigation parameters which might have the following properties:
    • timeout <number> Maximum navigation time in milliseconds, defaults to 30 seconds.
    • waitUntil <string> When to consider navigation succeeded, defaults to load. Could be either:
      • load - consider navigation to be finished when the load event is fired.
      • networkidle - consider navigation to be finished when the network activity stays "idle" for at least networkIdleTimeoutms.
    • networkIdleInflight <number> Maximum amount of inflight requests which are considered "idle". Takes effect only with waitUntil: 'networkidle' parameter.
    • networkIdleTimeout <number> A timeout to wait before completing navigation. Takes effect only with waitUntil: 'networkidle' parameter.
  • returns: <Promise<Response>> Promise which resolves to the main resource response. In case of multiple redirects, the navigation will resolve with the response of the last redirect.

page.waitForSelector(selector[, options])

  • selector <string> A query selector to wait for on the page.
  • options <Object> Optional waiting parameters
    • visible <boolean> wait for element to be present in DOM and to be visible, i.e. to not have display: none or visibility: hidden CSS properties. Defaults to false.
    • timeout <number> maximum time to wait for in milliseconds. Defaults to 30000 (30 seconds).
  • returns: <Promise> Promise which resolves when the element matching selector appears in the page.

Shortcut for page.mainFrame().waitForSelector().

class: Keyboard

Keyboard provides an api for managing a virtual keyboard. The high level api is page.type, which takes raw characters and generates proper keydown, keypress/input, and keyup events on your page.

For finer control, you can use keyboard.down, keyboard.up, and keyboard.sendCharacter to manually fire events as if they were generated from a real keyboard.

An example of holding down Shift in order to select and delete some text:

page.type('Hello World!');
page.press('ArrowLeft');

page.keyboard.down('Shift');
for (let i = 0; i < ' World'.length; i++)
  page.press('ArrowLeft');
page.keyboard.up('Shift');

page.press('Backspace');
// Result text will end up saying 'Hello!'

keyboard.down(key[, options])

Dispatches a keydown event.

This will not send input events unless text is specified.

If key is a modifier key, Shift, Meta, Control, or Alt, subsequent key presses will be sent with that modifier active. To release the modifier key, use keyboard.up.

keyboard.sendCharacter(char)

  • char <string> Character to send into the page.
  • returns: <Promise>

Dispatches a keypress and input event. This does not send a keydown or keyup event.

page.keyboard.sendCharacter('嗨');

keyboard.up(key)

Dispatches a keyup event.

class: Mouse

mouse.click(x, y, [options])

Shortcut for mouse.move, mouse.down and mouse.up.

mouse.down([options])

  • options <Object>
    • button <string> left, right, or middle, defaults to left.
    • clickCount <number> defaults to 1
  • returns: <Promise>

Dispatches a mousedown event.

mouse.move(x, y)

Dispatches a mousemove event.

mouse.up([options])

  • options <Object>
    • button <string> left, right, or middle, defaults to left.
    • clickCount <number> defaults to 1
  • returns: <Promise>

Dispatches a mouseup event.

class: Dialog

Dialog objects are dispatched by page via the 'dialog' event.

An example of using Dialog class:

const {Browser} = require('puppeteer');
const browser = new Browser({headless: false});
browser.newPage().then(async page => {
  page.on('dialog', dialog => {
    console.log(dialog.message());
    dialog.dismiss();
    browser.close();
  });
  page.evaluate(() => alert('1'));
});

Note

Chrome Headless currently has issues with managing javascript dialogs, see issue 13

dialog.accept([promptText])

  • promptText <string> A text to enter in prompt. Does not cause any effects if the dialog's type is not prompt.
  • returns: <Promise> Promise which resolves when the dialog has being accepted.

dialog.dismiss()

  • returns: <Promise> Promise which resolves when the dialog has being dismissed.

dialog.message()

  • returns: <string> A message displayed in the dialog.

dialog.type

Dialog's type, could be one of the alert, beforeunload, confirm and prompt.

class: Frame

At every point of time, page exposes its current frame tree via the page.mainFrame() and frame.childFrames() methods.

Frame object's lifecycle is controlled by three events, dispatched on the page object:

  • 'frameattached' - fired when the frame gets attached to the page. Frame could be attached to the page only once.
  • 'framenavigated' - fired when the frame commits navigation to a different URL.
  • 'framedetached' - fired when the frame gets detached from the page. Frame could be detached from the page only once.

An example of dumping frame tree:

const {Browser} = new require('.');
const browser = new Browser({headless: true});

browser.newPage().then(async page => {
  await page.navigate('https://www.google.com/chrome/browser/canary.html');
  dumpFrameTree(page.mainFrame(), '');
  browser.close();

  function dumpFrameTree(frame, indent) {
    console.log(indent + frame.url());
    for (let child of frame.childFrames())
      dumpFrameTree(child, indent + '  ');
  }
});

frame.$(selector, pageFunction, ...args)

  • selector <string> A selector to be matched in the page
  • pageFunction <function(Element)> Function to be evaluated with first element matching selector
  • ...args <...string> Arguments to pass to pageFunction
  • returns: <Promise<Object>> Promise which resolves to function return value.

frame.$$(selector, pageFunction, ...args)

  • selector <string> A selector to be matched in the page
  • pageFunction <function(Element)> Function to be evaluted for every element matching selector.
  • ...args <...string> Arguments to pass to pageFunction
  • returns: <Promise<Array<Object>>> Promise which resolves to array of function return values.

frame.addScriptTag(url)

  • url <string> Url of a script to be added
  • returns: <Promise> Promise which resolves as the script gets added and loads.

Adds a <script></script> tag to the frame with the desired url. Alternatively, javascript could be injected to the frame via frame.injectFile method.

frame.childFrames()

frame.click(selector[, options])

  • selector <string> A query selector to search for element to click. If there are multiple elements satisfying the selector, the first will be clicked.
  • options <Object>
    • button <string> left, right, or middle, defaults to left.
    • clickCount <number> defaults to 1
  • returns: <Promise> Promise which resolves when the element matching selector is successfully clicked. Promise gets rejected if there's no element matching selector.

frame.evaluate(pageFunction, ...args)

  • pageFunction <function|string> Function to be evaluated in browser context
  • ...args <...string> Arguments to pass to pageFunction
  • returns: <Promise<Object>> Promise which resolves to function return value

If the function, passed to the frame.evaluate, returns a Promise, then frame.evaluate would wait for the promise to resolve and return it's value.

frame.focus(selector)

  • selector <string> A query selector of element to focus. If there are multiple elements satisfying the selector, the first will be focused.
  • returns: <Promise> Promise which resolves when the element matching selector is successfully focused. Promise gets rejected if there's no element matching selector.

frame.hover(selector)

  • selector <string> A query selector to search for element to hover. If there are multiple elements satisfying the selector, the first will be hovered.
  • returns: <Promise> Promise which resolves when the element matching selector is successfully hovered. Promise gets rejected if there's no element matching selector.

frame.injectFile(filePath)

  • filePath <string> Path to the javascript file to be injected into frame.
  • returns: <Promise> Promise which resolves when file gets successfully evaluated in frame.

frame.isDetached()

Returns true if the frame has being detached, or false otherwise.

frame.name()

Returns frame's name attribute as specified in the tag.

If the name is empty, returns the id attribute instead.

Note: This value is calculated once when the frame is created, and will not update if the attribute is changed later.

frame.parentFrame()

  • returns: <Frame> Returns parent frame, if any. Detached frames and main frames return null.

frame.title()

frame.url()

Returns frame's url.

frame.waitFor(selectorOrFunctionOrTimeout[, options])

This is a shortcut method for frame.waitForSelector or page.mainFrame().waitForFunction().

This method behaves differently with respect to the type of the first parameter:

  • if selectorOrFunctionOrTimeout is a string, than the first argument is treated as a selector to wait for and the method is a shortcut for frame.waitForSelector
  • if selectorOrFunctionOrTimeout is a function, than the first argument is treated as a predicate to wait for and the method is a shortcut for frame.waitForFunction().
  • if selectorOrFunctionOrTimeout is a number, than the first argument is treated as a timeout in milliseconds and the method returns a promise which resolves after the timeout
  • otherwise, an exception is thrown

frame.waitForFunction(pageFunction[, options], ...args)

  • pageFunction <function|string> Function to be evaluated in browser context
  • options <Object> Optional waiting parameters
    • polling <string|number> An interval at which the pageFunction is executed, defaults to raf. If polling is a number, then it is treated as an interval in milliseconds at which the function would be executed. If polling is a string, then it could be one of the following values:
      • raf - to constantly execute pageFunction in requestAnimationFrame callback. This is the tightest polling mode which is suitable to observe styling changes.
      • mutation - to execute pageFunction on every DOM mutation.
    • timeout <number> maximum time to wait for in milliseconds. Defaults to 30000 (30 seconds).
  • ...args <...Object> Arguments to pass to pageFunction
  • returns: <Promise> Promise which resolves when element specified by selector string is added to DOM.

The waitForFunction could be used to observe viewport size change:

const {Browser} = require('.');
const browser = new Browser();

browser.newPage().then(async page => {
  const watchDog = page.waitForFunction('window.innerWidth < 100);
  page.setViewport({width: 50, height: 50});
  await watchDog;
  browser.close();
});

frame.waitForSelector(selector[, options])

  • selector <string> CSS selector of awaited element,
  • options <Object> Optional waiting parameters
    • visible <boolean> wait for element to be present in DOM and to be visible, i.e. to not have display: none or visibility: hidden CSS properties. Defaults to false.
    • timeout <number> maximum time to wait for in milliseconds. Defaults to 30000 (30 seconds).
  • returns: <Promise> Promise which resolves when element specified by selector string is added to DOM.

Wait for the selector to appear in page. If at the moment of calling the method the selector already exists, the method will return immediately. If the selector doesn't appear after the timeout milliseconds of waiting, the function will throw.

This method works across navigations:

const {Browser} = new require('puppeteer');
const browser = new Browser();

browser.newPage().then(async page => {
  let currentURL;
  page.waitForSelector('img').then(() => console.log('First URL with image: ' + currentURL));
  for (currentURL of ['https://example.com', 'https://google.com', 'https://bbc.com'])
    await page.navigate(currentURL);
  browser.close();
});

class: Request

Whenever the page sends a request, the following events are emitted by puppeteer's page:

  • 'request' emitted when the request is issued by the page.
  • 'response' emitted when/if the response is received for the request.
  • 'requestfinished' emitted when the response body is downloaded and the request is complete.

If request fails at some point, then instead of 'requestfinished' event (and possibly instead of 'response' event), the 'requestfailed' event is emitted.

If request gets a 'redirect' response, the request is successfully finished with the 'requestfinished' event, and a new request is issued to a redirected url.

Request class represents requests which are sent by page. Request implements Body mixin, which in case of HTTP POST requests allows clients to call request.json() or request.text() to get different representations of request's body.

request.headers

  • <Map> A map of HTTP headers associated with the request.

request.method

Contains the request's method (GET, POST, etc.)

request.response()

  • returns: <Response> A matching Response object, or null if the response has not been received yet.

request.url

Contains the URL of the request.

class: Response

Response class represents responses which are received by page. Response implements Body mixin, which allows clients to call response.json() or response.text() to get different representations of response body.

response.headers

  • <Map> A map of HTTP headers associated with the response.

response.ok

Contains a boolean stating whether the response was successful (status in the range 200-299) or not.

response.request()

response.status

Contains the status code of the response (e.g., 200 for a success).

response.statusText

Contains the status message corresponding to the status code (e.g., OK for 200).

response.url

Contains the URL of the response.

class: InterceptedRequest

InterceptedRequest represents an intercepted request, which can be mutated and either continued or aborted. InterceptedRequest which is not continued or aborted will be in a 'hanging' state.

interceptedRequest.abort()

Aborts request.

interceptedRequest.continue()

Continues request.

interceptedRequest.headers

  • <Map> A map of HTTP headers associated with the request.

Headers could be mutated. Must not be changed in response to an authChallenge.

interceptedRequest.method

Contains the request's method (GET, POST, etc.)

If set this allows the request method to be overridden. Must not be changed in response to an authChallenge.

interceptedRequest.postData

Contains POST data for POST requests.

request.postData is mutable and could be written to. Must not be changed in response to an authChallenge.

interceptedRequest.url

If changed, the request url will be modified in a way that's not observable by page. Must not be changed in response to an authChallenge.

class: Body

body.buffer()

body.json()

body.text()

  • returns: <Promise<[text]>>