Verification

• Console logs
• Page errors
• Page events

Console logs

Console messages logged in the page can be brought into the Playwright context.

Sync

# Listen for all console logs

page.on("console", msg => print(msg.text))

# Listen for all console events and handle errors

page.on("console", lambda msg: print(f"error: {msg.text}") if msg.type == "error" else None)

# Get the next console log

with page.expect_console_message() as msg_info:

# Issue console.log inside the page

page.evaluate("console.log('hello', 42, { foo: 'bar' })")

msg = msg_info.value

# Deconstruct print arguments

msg.args[0].json_value() # hello

msg.args[1].json_value() # 42

Async

# Listen for all console logs

page.on("console", msg => print(msg.text))

# Listen for all console events and handle errors

page.on("console", lambda msg: print(f"error: {msg.text}") if msg.type == "error" else None)

# Get the next console log

async with page.expect_console_message() as msg_info:

# Issue console.log inside the page

await page.evaluate("console.log('hello', 42, { foo: 'bar' })")

msg = await msg_info.value

# Deconstruct print arguments

await msg.args[0].json_value() # hello

await msg.args[1].json_value() # 42

API reference

• ConsoleMessage
• Page
• page.on("console")

Page errors

Listen for uncaught exceptions in the page with the pagerror event.

Sync

# Log all uncaught errors to the terminal

page.on("pageerror", lambda exc: print(f"uncaught exception: {exc}"))

# Navigate to a page with an exception.

page.goto("data:text/html,<script>throw new Error('test')</script>")

Async

# Log all uncaught errors to the terminal

page.on("pageerror", lambda exc: print(f"uncaught exception: {exc}"))

# Navigate to a page with an exception.

await page.goto("data:text/html,<script>throw new Error('test')</script>")

API reference

• Page
• page.on("pageerror")

Page events

"requestfailed"

page.on("requestfailed", lambda request: print(request.url + " " + request.failure.error_text))

"dialog" - handle alert, confirm, prompt

page.on("dialog", lambda dialog: dialog.accept())

"popup" - handle popup windows

Sync

with page.expect_popup() as popup_info:

page.click("#open")

popup = popup_info.value

Async

async with page.expect_popup() as popup_info:

await page.click("#open")

popup = await popup_info.value

API reference

• Page
• page.on("requestfailed")
• page.on("dialog")
• page.on("popup")