Selenium python execute async script
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1) как правильно использовать selenium execute_async_script — как обернуть кусок js кода делающий return(value); в call back и правильно скормить selenium’у ?
Допустим есть js код, который мне написали для выбора значения со страницы, так вот если я обзову это функцией async_get_price и вместо console.log(price); напишу return price; — какой код надо добавить чтобы чтобы возвращаемое значение попало в call back и далее в результат driver.execute_async_script()?
если упрощеннно:
———cut————
function async_get_price() return 10.1;
>
async_get_price();
———cut————
Как вызывть этот код с call back из driver.execute_async_script()?
2) И ещё вопрос — асинхронный вызов предполагает возврат значения не сразу. Что делает питоновский код использующий result=driver.execute_async_script(«some js code») — ждёт некоторый timeout пока асинхронный код успеет вернуть значение или сразу возвращает управление и result ещё надо обрабатывть в питоне пока он не окажется изменён?
1) поскольку ф-ия callback подставляется автоматически последним аргументом и возвращает уже свой аргумент, то код нужно предварить объявлением адреса вызова как переменной:
«var callback = arguments[arguments.length — 1];»
а в месте возврата результата вызвать этот адрес с возвращаемым значением как параметром:
Кусок кода из вопроса в итоге будет выглядеть так:
———cut————
var callback = arguments[arguments.length — 1];
function async_get_price() return 10.1;
>
value2return=async_get_price();
callback(value2return)
———cut————
Питоновская ф-я совершает асинхронный вызов и возвращает управление синхронно, отдавая резльтат или exception спустя таймаут в милисекундах, который задается вызовом set_script_timeout(), например:
При использовании надстройки elementium над selenium не поддерживается вызов execute_async_script(), так что надо вызывать его из selenium объекта который использовался для инициализации elementium объекта, то есть в нижеследующем примере:
print «Opening browser instance..»
browser=webdriver.Firefox()
print «Initializing elementium selenium extention..»
se = SeElements(browser)
вызов должен быть исполнен для объекта browser:
1.9.8. selenium.webdriver.remote.webdriver¶
ABC’s allow custom implementations of Webdriver to be registered so that isinstance type checks will succeed.
class selenium.webdriver.remote.webdriver. WebDriver ( command_executor=’http://127.0.0.1:4444′, keep_alive=True, file_detector=None, options: Union[selenium.webdriver.common.options.BaseOptions, List[selenium.webdriver.common.options.BaseOptions]] = None ) [source] ¶
Controls a browser by sending commands to a remote server. This server is expected to be running the WebDriver wire protocol as defined at https://github.com/SeleniumHQ/selenium/wiki/JsonWireProtocol.
- session_id — String ID of the browser session started and controlled by this WebDriver.
- capabilities — Dictionary of effective capabilities of this browser session as returned by the remote server. See https://github.com/SeleniumHQ/selenium/wiki/DesiredCapabilities
- command_executor — remote_connection.RemoteConnection object used to execute commands.
- error_handler — errorhandler.ErrorHandler object used to handle errors.
Create a new driver that will issue commands using the wire protocol.
- command_executor — Either a string representing URL of the remote server or a custom remote_connection.RemoteConnection object. Defaults to ‘http://127.0.0.1:4444/wd/hub’.
- keep_alive — Whether to configure remote_connection.RemoteConnection to use HTTP keep-alive. Defaults to True.
- file_detector — Pass custom file detector object during instantiation. If None, then default LocalFileDetector() will be used.
- options — instance of a driver options.Options class
Adds a cookie to your current session.
- cookie_dict: A dictionary object, with required keys — “name” and “value”; optional keys — “path”, “domain”, “secure”, “httpOnly”, “expiry”, “sameSite”
driver.add_cookie('name' : 'foo', 'value' : 'bar'>) driver.add_cookie('name' : 'foo', 'value' : 'bar', 'path' : '/'>) driver.add_cookie('name' : 'foo', 'value' : 'bar', 'path' : '/', 'secure' : True>) driver.add_cookie('name' : 'foo', 'value' : 'bar', 'sameSite' : 'Strict'>)
Injects a credential into the authenticator.
add_virtual_authenticator ( options: selenium.webdriver.common.virtual_authenticator.VirtualAuthenticatorOptions ) → None [source] ¶
Adds a virtual authenticator with the given options.
Returns a ApplicationCache Object to interact with the browser app cache.
Goes one step backward in the browser history.
returns the drivers current capabilities being used.
Closes the current window.
Creates a web element with the specified element_id .
Gets the URL of the current page.
Returns the handle of the current window.
driver.current_window_handle
Delete all cookies in the scope of the session.
Deletes a single cookie with the given name.
driver.delete_cookie('my_cookie')
returns the drivers current desired capabilities being used.
execute ( driver_command: str, params: dict = None ) → dict [source] ¶
Sends a command to be executed by a command.CommandExecutor.
- driver_command: The name of the command to execute as a string.
- params: A dictionary of named parameters to send with the command.
The command’s JSON response loaded into a dictionary object.
Asynchronously Executes JavaScript in the current window/frame.
script = "var callback = arguments[arguments.length - 1]; " \ "window.setTimeout(function()< callback('timeout') >, 3000);" driver.execute_async_script(script)
Synchronously Executes JavaScript in the current window/frame.
driver.execute_script('return document.title;')
Overrides the current file detector (if necessary) in limited context. Ensures the original file detector is set afterwards.
with webdriver.file_detector_context(UselessFileDetector): someinput.send_keys('/etc/hosts')
- file_detector_class — Class of the desired file detector. If the class is different from the current file_detector, then the class is instantiated with args and kwargs and used as a file detector during the duration of the context manager.
- args — Optional arguments that get passed to the file detector class during instantiation.
- kwargs — Keyword arguments, passed the same way as args.
Find an element given a By strategy and locator.
element = driver.find_element(By.ID, 'foo')
Find elements given a By strategy and locator.
elements = driver.find_elements(By.CLASS_NAME, 'foo')
Goes one step forward in the browser history.
Invokes the window manager-specific ‘full screen’ operation.
Loads a web page in the current browser session.
get_cookie ( name ) → Optional[Dict] [source] ¶
Get a single cookie by name. Returns the cookie if found, None if not.
driver.get_cookie('my_cookie')
Returns a set of dictionaries, corresponding to cookies visible in the current session.
Returns the list of credentials owned by the authenticator.
Gets the log for a given log type.
driver.get_log('browser') driver.get_log('driver') driver.get_log('client') driver.get_log('server')
Gets the screenshot of the current window as a base64 encoded string which is useful in embedded images in HTML.
driver.get_screenshot_as_base64()
Saves a screenshot of the current window to a PNG image file. Returns False if there is any IOError, else returns True. Use full paths in your filename.
- filename: The full path you wish to save your screenshot to. This should end with a .png extension.
driver.get_screenshot_as_file('/Screenshots/foo.png')
Gets the screenshot of the current window as a binary data.
driver.get_screenshot_as_png()
Gets the x,y position of the current window.
driver.get_window_position()
Gets the x, y coordinates of the window as well as height and width of the current window.
Gets the width and height of the current window.
Sets a sticky timeout to implicitly wait for an element to be found, or a command to complete. This method only needs to be called one time per session. To set the timeout for calls to execute_async_script, see set_script_timeout.
Gets a list of the available log types. This only works with w3c compliant browsers.
Maximizes the current window that webdriver is using.
Invokes the window manager-specific ‘minimize’ operation.
Returns the name of the underlying browser for this instance.
Gets the current orientation of the device.
orientation = driver.orientation
Gets the source of the current page.
Store common javascript scripts to be executed later by a unique hashable ID.
print_page ( print_options: Optional[selenium.webdriver.common.print_page_options.PrintOptions] = None ) → str [source] ¶
Takes PDF of the current page.
The driver makes a best effort to return a PDF based on the provided parameters.
Quits the driver and closes every associated window.
Refreshes the current page.
Removes all credentials from the authenticator.
remove_credential ( credential_id: Union[str, bytearray] ) → None [source] ¶
Removes a credential from the authenticator.
Removes a previously added virtual authenticator.
The authenticator is no longer valid after removal, so no methods may be called.
save_screenshot ( filename ) → bool [source] ¶
Saves a screenshot of the current window to a PNG image file. Returns False if there is any IOError, else returns True. Use full paths in your filename.
- filename: The full path you wish to save your screenshot to. This should end with a .png extension.
driver.save_screenshot('/Screenshots/foo.png')
Set the amount of time to wait for a page load to complete before throwing an error.
driver.set_page_load_timeout(30)
Set the amount of time that the script should wait during an execute_async_script call before throwing an error.
driver.set_script_timeout(30)
Sets whether the authenticator will simulate success or fail on user verification.
verified: True if the authenticator will pass user verification, False otherwise.
set_window_position ( x, y, windowHandle: str = ‘current’ ) → dict [source] ¶
Sets the x,y position of the current window. (window.moveTo)
- x: the x-coordinate in pixels to set the window position
- y: the y-coordinate in pixels to set the window position
driver.set_window_position(0,0)
Sets the x, y coordinates of the window as well as height and width of the current window. This method is only supported for W3C compatible browsers; other browsers should use set_window_position and set_window_size .
driver.set_window_rect(x=10, y=10) driver.set_window_rect(width=100, height=200) driver.set_window_rect(x=10, y=10, width=100, height=200)
Sets the width and height of the current window. (window.resizeTo)
driver.set_window_size(800,600)
Called before starting a new session.
This method may be overridden to define custom startup behavior.
start_session ( capabilities: dict ) → None [source] ¶
Creates a new session with the desired capabilities.
Called after executing a quit command.
This method may be overridden to define custom shutdown behavior.
element = driver.switch_to.active_element alert = driver.switch_to.alert driver.switch_to.default_content() driver.switch_to.frame('frame_name') driver.switch_to.frame(1) driver.switch_to.frame(driver.find_elements(By.TAG_NAME, "iframe")[0]) driver.switch_to.parent_frame() driver.switch_to.window('main')
Get all the timeouts that have been set on the current session.
Returns the title of the current page.
Remove a pinned script from storage.
Returns the id of the virtual authenticator.
Returns the handles of all windows within the current session.