Selenium click不生效 报错selenium.common.exceptions.InvalidArgumentException

记录在使用selenium过程中踩的坑------

在使用selenium时，用click点击网站弹出的文件上传框的“上传文件”按钮不生效，报错selenium.common.exceptions.InvalidArgumentException

log如下：

test_xxxxxx.py::test_xxxxxxx FAILED [100%]Traceback (most recent call last):
  File "F:\xxxxxxxx\page\BasePage.py", line 20, in box_click
    element.click()
  File "F:\Python\lib\site-packages\selenium\webdriver\remote\webelement.py", line 80, in click
    self._execute(Command.CLICK_ELEMENT)
  File "F:\Python\lib\site-packages\selenium\webdriver\remote\webelement.py", line 633, in _execute
    return self._parent.execute(command, params)
  File "F:\Python\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 321, in execute
    self.error_handler.check_response(response)
  File "F:\Python\lib\site-packages\selenium\webdriver\remote\errorhandler.py", line 242, in check_response
    raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.InvalidArgumentException: Message: invalid argument
  (Session info: chrome=78.0.3904.97)

元素的定位是这样： Select_File = (By.CSS_SELECTOR, "input[type=file]")

解决方法：

    def action_click(self, locator):
        temp = 1
        log = self._log
        while temp < 5:
            try:
                element = WebDriverWait(self._driver, 5, 1).until(expected_conditions.element_to_be_clickable(locator))
                # element.click()
                ActionChains(self._driver).click(element).perform()
            except Exception as e:
                time.sleep(0.5)
                temp += 1
                # traceback.print_exc()
                log.logger.debug(traceback.print_exc())
            else:
                break
            # 尝试5次仍失败，则终止
            if temp == 5:
                self.save_screen()
                raise Exception("Fail to click")

把element.click()改为 ActionChains(self._driver).click(element).perform()

原先用的click方法是

File "F:\Python\lib\site-packages\selenium\webdriver\remote\webelement.py", line 80, in click

    self._execute(Command.CLICK_ELEMENT)

换为ActionChains的

至于为什么第一种方式不可以，现在还没弄懂。

引申：

两种Click有什么不同？

下面是我的一点小见解。

我大致看了一下源码，第一种方式是对远程的web driver post 一个请求/session/$sessionId/element/$id/click 去进行click操作

Communicates with the Remote WebDriver server using the WebDriver wire protocol

https://github.com/SeleniumHQ/selenium/wiki/JsonWireProtocol

Python\lib\site-packages\selenium\webdriver\remote\webelement.py

def click(self):

"""Clicks the element."""

self._execute(Command.CLICK_ELEMENT)

Python\Lib\site-packages\selenium\webdriver\remote\remote_connection.py

Command.CLICK_ELEMENT: ('POST', '/session/$sessionId/element/$id/click')

第二种方式是模拟鼠标操作，对元素进行点击，再post /session/$sessionId/actions

Python\Lib\site-packages\selenium\webdriver\common\action_chains.py

ActionChains are a way to automate low level interactions such as

mouse movements, mouse button actions, key press, and context menu interactions.

This is useful for doing more complex actions like hover over and drag and drop.

    def click(self, on_element=None):
        """
        Clicks an element.

        :Args:
         - on_element: The element to click.
           If None, clicks on current mouse position.
        """
        if on_element:
            self.move_to_element(on_element)
        if self._driver.w3c:
            self.w3c_actions.pointer_action.click()
            self.w3c_actions.key_action.pause()
            self.w3c_actions.key_action.pause()
        else:
            self._actions.append(lambda: self._driver.execute(
                                 Command.CLICK, {'button': 0}))
        return self

Python\Lib\site-packages\selenium\webdriver\common\actions\action_builder.py

    def perform(self):
        enc = {"actions": []}
        for device in self.devices:
            encoded = device.encode()
            if encoded['actions']:
                enc["actions"].append(encoded)
        self.driver.execute(Command.W3C_ACTIONS, enc)

Command.W3C_ACTIONS: ('POST', '/session/$sessionId/actions')