JSHandle represents an in-page JavaScript object. JSHandles can be created with the page.evaluate_handle() method.
window_handle = page.evaluate_handle("window")
window_handle = await page.evaluate_handle("window")
JSHandle prevents the referenced JavaScript object being garbage collected unless the handle is exposed with js_handle.dispose(). JSHandles are auto-disposed when their origin frame gets navigated or the parent context gets destroyed.
JSHandle instances can be used as an argument in page.eval_on_selector(), page.evaluate() and page.evaluate_handle() methods.
Methods disposeAdded before v1.9 jsHandle.disposeThe jsHandle.dispose method stops referencing the element handle.
Usage
Returns
evaluateAdded before v1.9 jsHandle.evaluateReturns the return value of expression.
This method passes this handle as the first argument to expression.
If expression returns a Promise, then handle.evaluate would wait for the promise to resolve and return its value.
Usage
tweet_handle = page.query_selector(".tweet .retweets")
assert tweet_handle.evaluate("node => node.innerText") == "10 retweets"
tweet_handle = await page.query_selector(".tweet .retweets")
assert await tweet_handle.evaluate("node => node.innerText") == "10 retweets"
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 jsHandle.evaluate_handleReturns the return value of expression as a JSHandle.
This method passes this handle as the first argument to expression.
The only difference between jsHandle.evaluate and jsHandle.evaluateHandle is that jsHandle.evaluateHandle returns JSHandle.
If the function passed to the jsHandle.evaluateHandle returns a Promise, then jsHandle.evaluateHandle would wait for the promise to resolve and return its value.
See page.evaluate_handle() for more details.
Usage
js_handle.evaluate_handle(expression)
js_handle.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
get_propertiesAdded before v1.9 jsHandle.get_propertiesThe method returns a map with own property names as keys and JSHandle instances for the property values.
Usage
handle = page.evaluate_handle("({ window, document })")
properties = handle.get_properties()
window_handle = properties.get("window")
document_handle = properties.get("document")
handle.dispose()
handle = await page.evaluate_handle("({ window, document })")
properties = await handle.get_properties()
window_handle = properties.get("window")
document_handle = properties.get("document")
await handle.dispose()
Returns
get_propertyAdded before v1.9 jsHandle.get_propertyFetches a single property from the referenced object.
Usage
js_handle.get_property(property_name)
Arguments
Returns
json_valueAdded before v1.9 jsHandle.json_valueReturns a JSON representation of the object. If the object has a toJSON function, it will not be called.
note
The method will return an empty JSON object if the referenced object is not stringifiable. It will throw an error if the object has circular references.
Usage
Returns
Properties as_elementAdded before v1.9 jsHandle.as_elementReturns either null or the object handle itself, if the object handle is an instance of ElementHandle.
Usage
Returns
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