Version: 1.10.0

Events

Playwright allows listening to various types of events happening in the web page, such as network requests, creation of child pages, dedicated workers etc. There are several ways to subscribe to such events:

Waiting for event#

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:

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

Wait for popup window:

with page.expect_popup() as popup:
page.evaluate("window.open()")
popup.value.goto("https://wikipedia.org")

Adding/removing event listener#

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:

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/")

Adding one-off listeners#

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

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

API reference#