The Worker class represents a WebWorker. worker event is emitted on the page object to signal a worker creation. close event is emitted on the worker object when the worker is gone.
def handle_worker(worker):
print("worker created: " + worker.url)
worker.on("close", lambda: print("worker destroyed: " + worker.url))
page.on('worker', handle_worker)
print("current workers:")
for worker in page.workers:
print(" " + worker.url)
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.
Usage
worker.evaluate(expression)
worker.evaluate(expression, **kwargs)
Arguments
JavaScript expression to be evaluated in the browser context. If the expression evaluates to a function, the function is automatically invoked.
arg EvaluationArgument (optional)#
Optional argument to pass to expression.
Returns
evaluate_handleAdded before v1.9 worker.evaluate_handleReturns 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.
Usage
worker.evaluate_handle(expression)
worker.evaluate_handle(expression, **kwargs)
Arguments
JavaScript expression to be evaluated in the browser context. If the expression evaluates to a function, the function is automatically invoked.
arg EvaluationArgument (optional)#
Optional argument to pass to expression.
Returns
Properties urlAdded before v1.9 worker.urlUsage
Returns
Events on("close")Added before v1.9 worker.on("close")Emitted when this dedicated WebWorker is terminated.
Usage
worker.on("close", handler)
Event data
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