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Events | Playwright Python

Playwright allows listening to various types of events happening on the web page, such as network requests, creation of child pages, dedicated workers etc. There are several ways to subscribe to such events, such as waiting for events or adding or removing event listeners.

Most of the time, scripts will need to wait for a particular event to happen. Below are some of the typical event awaiting patterns.

Wait for a request with the specified url using page.expect_request():

• Sync
• Async

with page.expect_request("**/*logo*.png") as first:
  page.goto("https://wikipedia.org")
print(first.value.url)

async with page.expect_request("**/*logo*.png") as first:
  await page.goto("https://wikipedia.org")
first_request = await first.value
print(first_request.url)

Wait for popup window:

• Sync
• Async

with page.expect_popup() as popup:
  page.get_by_text("open the popup").click()
popup.value.goto("https://wikipedia.org")

async with page.expect_popup() as popup:
  await page.get_by_text("open the popup").click()
child_page = await popup.value
await child_page.goto("https://wikipedia.org")

Sometimes, events happen in random time and instead of waiting for them, they need to be handled. Playwright supports traditional language mechanisms for subscribing and unsubscribing from the events:

• Sync
• Async

def print_request_sent(request):
  print("Request sent: " + request.url)

def print_request_finished(request):
  print("Request finished: " + request.url)

page.on("request", print_request_sent)
page.on("requestfinished", print_request_finished)
page.goto("https://wikipedia.org")

page.remove_listener("requestfinished", print_request_finished)
page.goto("https://www.openstreetmap.org/")

def print_request_sent(request):
  print("Request sent: " + request.url)

def print_request_finished(request):
  print("Request finished: " + request.url)

page.on("request", print_request_sent)
page.on("requestfinished", print_request_finished)
await page.goto("https://wikipedia.org")

page.remove_listener("requestfinished", print_request_finished)
await page.goto("https://www.openstreetmap.org/")

If a certain event needs to be handled once, there is a convenience API for that:

• Sync
• Async

page.once("dialog", lambda dialog: dialog.accept("2021"))
page.evaluate("prompt('Enter a number:')")

page.once("dialog", lambda dialog: dialog.accept("2021"))
await page.evaluate("prompt('Enter a number:')")

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