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Worker | Playwright

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.

• worker.on("close")
• worker.evaluate(expression, **kwargs)
• worker.evaluate_handle(expression, **kwargs)
• worker.url

• type: <Worker>

Emitted when this dedicated WebWorker is terminated.

• arg <[EvaluationArgument]> Optional argument to pass to page_function
• expression <str> JavaScript expression to be evaluated in the browser context. If it looks like a function declaration, it is interpreted as a function. Otherwise, evaluated as an expression.
• force_expr <bool> Whether to treat given expression as JavaScript evaluate expression, even though it looks like an arrow function. Optional.
• returns: <Serializable>

Returns the return value of page_function

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. DevTools Protocol also supports transferring some additional values that are not serializable by JSON: -0, NaN, Infinity, -Infinity, and bigint literals.

• arg <[EvaluationArgument]> Optional argument to pass to page_function
• expression <str> JavaScript expression to be evaluated in the browser context. If it looks like a function declaration, it is interpreted as a function. Otherwise, evaluated as an expression.
• force_expr <bool> Whether to treat given expression as JavaScript evaluate expression, even though it looks like an arrow function. Optional.
• returns: <JSHandle>

Returns the return value of page_function as in-page object (JSHandle).

The only difference between worker.evaluate and worker.evaluateHandle is that worker.evaluateHandle returns in-page object (JSHandle).

If the function passed to the worker.evaluateHandle returns a Promise, then worker.evaluateHandle would wait for the promise to resolve and return its value.

• returns: <str>

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