playwright.async_api._generated.Worker Class Reference

Inheritance diagram for playwright.async_api._generated.Worker:

Collaboration diagram for playwright.async_api._generated.Worker:

Public Member Functions
None	on (self, Literal["close"] event, typing.Callable[["Worker"], "typing.Union[typing.Awaitable[None], None]"] f)
None	on (self, Literal["console"] event, typing.Callable[["ConsoleMessage"], "typing.Union[typing.Awaitable[None], None]"] f)
None	on (self, str event, typing.Callable[..., typing.Union[typing.Awaitable[None], None]] f)
None	once (self, Literal["close"] event, typing.Callable[["Worker"], "typing.Union[typing.Awaitable[None], None]"] f)
None	once (self, Literal["console"] event, typing.Callable[["ConsoleMessage"], "typing.Union[typing.Awaitable[None], None]"] f)
None	once (self, str event, typing.Callable[..., typing.Union[typing.Awaitable[None], None]] f)
str	url (self)
typing.Any	evaluate (self, str expression, typing.Optional[typing.Any] arg=None)
"JSHandle"	evaluate_handle (self, str expression, typing.Optional[typing.Any] arg=None)
AsyncEventContextManager	expect_event (self, str event, typing.Optional[typing.Callable] predicate=None, *typing.Optional[float] timeout=None)
Public Member Functions inherited from playwright._impl._async_base.AsyncBase
None	__init__ (self, Any impl_obj)
str	__str__ (self)
None	remove_listener (self, Any event, Any f)
Public Member Functions inherited from playwright._impl._impl_to_api_mapping.ImplWrapper
str	__repr__ (self)

Additional Inherited Members
Protected Member Functions inherited from playwright._impl._async_base.AsyncBase
Callable[..., None]	_wrap_handler (self, Union[Callable[..., Any], Any] handler)
Protected Attributes inherited from playwright._impl._async_base.AsyncBase
	_loop
Protected Attributes inherited from playwright._impl._impl_to_api_mapping.ImplWrapper
	_impl_obj

Member Function Documentation

evaluate()

typing.Any playwright.async_api._generated.Worker.evaluate	(		self,
		str	expression,
		typing.Optional[typing.Any]	arg = None
	)

Worker.evaluate

Returns the return value of `expression`.

If the function passed to the `worker.evaluate()` returns a [Promise], then `worker.evaluate()`
would wait for the promise to resolve and return its value.

If the function passed to the `worker.evaluate()` returns a non-[Serializable] value, then
`worker.evaluate()` returns `undefined`. Playwright also supports transferring some additional values that
are not serializable by `JSON`: `-0`, `NaN`, `Infinity`, `-Infinity`.

Parameters
----------
expression : str
    JavaScript expression to be evaluated in the browser context. If the expression evaluates to a function, the
    function is automatically invoked.
arg : Union[Any, None]
    Optional argument to pass to `expression`.

Returns
-------
Any

evaluate_handle()

"JSHandle" playwright.async_api._generated.Worker.evaluate_handle	(		self,
		str	expression,
		typing.Optional[typing.Any]	arg = None
	)

Worker.evaluate_handle

Returns the return value of `expression` as a `JSHandle`.

The only difference between `worker.evaluate()` and `worker.evaluate_handle()` is that
`worker.evaluate_handle()` returns `JSHandle`.

If the function passed to the `worker.evaluate_handle()` returns a [Promise], then
`worker.evaluate_handle()` would wait for the promise to resolve and return its value.

Parameters
----------
expression : str
    JavaScript expression to be evaluated in the browser context. If the expression evaluates to a function, the
    function is automatically invoked.
arg : Union[Any, None]
    Optional argument to pass to `expression`.

Returns
-------
JSHandle

expect_event()

AsyncEventContextManager playwright.async_api._generated.Worker.expect_event	(		self,
		str	event,
		typing.Optional[typing.Callable]	predicate = None,
		*typing.Optional[float]	timeout = None
	)

Worker.expect_event

Waits for event to fire and passes its value into the predicate function. Returns when the predicate returns truthy
value. Will throw an error if the page is closed before the event is fired. Returns the event data value.

**Usage**

```py
async with worker.expect_event(\"console\") as event_info:
    await worker.evaluate(\"console.log(42)\")
message = await event_info.value
```

Parameters
----------
event : str
    Event name, same one typically passed into `*.on(event)`.
predicate : Union[Callable, None]
    Receives the event data and resolves to truthy value when the waiting should resolve.
timeout : Union[float, None]
    Maximum time to wait for in milliseconds. Defaults to `30000` (30 seconds). Pass `0` to disable timeout. The
    default value can be changed by using the `browser_context.set_default_timeout()`.

Returns
-------
EventContextManager

on() [1/3]

None playwright.async_api._generated.Worker.on	(		self,
		Literal["close"]	event,
		typing.Callable[["Worker"], "typing.Union[typing.Awaitable[None], None]"]	f
	)

Emitted when this dedicated [WebWorker](https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API) is
terminated.

Reimplemented from playwright._impl._async_base.AsyncBase.

on() [2/3]

None playwright.async_api._generated.Worker.on	(		self,
		Literal["console"]	event,
		typing.Callable[ ["ConsoleMessage"], "typing.Union[typing.Awaitable[None], None]" ]	f
	)

Emitted when JavaScript within the worker calls one of console API methods, e.g. `console.log` or `console.dir`.

Reimplemented from playwright._impl._async_base.AsyncBase.

on() [3/3]

None playwright.async_api._generated.Worker.on	(		self,
		str	event,
		typing.Callable[..., typing.Union[typing.Awaitable[None], None]]	f
	)

Registers the function ``f`` to the event name ``event``.

Reimplemented from playwright._impl._async_base.AsyncBase.

once() [1/3]

None playwright.async_api._generated.Worker.once	(		self,
		Literal["close"]	event,
		typing.Callable[["Worker"], "typing.Union[typing.Awaitable[None], None]"]	f
	)

Emitted when this dedicated [WebWorker](https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API) is
terminated.

Reimplemented from playwright._impl._async_base.AsyncBase.

once() [2/3]

None playwright.async_api._generated.Worker.once	(		self,
		Literal["console"]	event,
		typing.Callable[ ["ConsoleMessage"], "typing.Union[typing.Awaitable[None], None]" ]	f
	)

Emitted when JavaScript within the worker calls one of console API methods, e.g. `console.log` or `console.dir`.

Reimplemented from playwright._impl._async_base.AsyncBase.

once() [3/3]

None playwright.async_api._generated.Worker.once	(		self,
		str	event,
		typing.Callable[..., typing.Union[typing.Awaitable[None], None]]	f
	)

The same as ``self.on``, except that the listener is automatically
removed after being called.

Reimplemented from playwright._impl._async_base.AsyncBase.

url()

str playwright.async_api._generated.Worker.url

(

self

)

Worker.url

Returns
-------
str

---

The documentation for this class was generated from the following file:

• docs/help/help-venv/lib/python3.12/site-packages/playwright/async_api/_generated.py