FAQ selenium无法click的一个案例分享(1)

案例描述

• http://sahitest.com/demo/php/fileUpload.htm

• 来自助教咨询

• 点击网页的第一个选择文件，如图

• 

示例代码

 from selenium import webdriver  
 ​
 driver = webdriver.Chrome()  
 driver.get('http://sahitest.com/demo/php/fileUpload.htm')  
 ​
 driver.find_element('id','file').click()

• 运行效果：报错了：invalid argument，无效的参数

 D:\Python39\python.exe D:/pythonProject/deom1.py
 Traceback (most recent call last):
   File "D:\pythonProject\deom1.py", line 8, in <module>
     driver.find_element('id','file').click()
   File "D:\Python39\lib\site-packages\selenium\webdriver\remote\webelement.py", line 88, in click
     self._execute(Command.CLICK_ELEMENT)
   File "D:\Python39\lib\site-packages\selenium\webdriver\remote\webelement.py", line 396, in _execute
     return self._parent.execute(command, params)
   File "D:\Python39\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 435, in execute
     self.error_handler.check_response(response)
   File "D:\Python39\lib\site-packages\selenium\webdriver\remote\errorhandler.py", line 247, in check_response
     raise exception_class(message, screen, stacktrace)
 selenium.common.exceptions.InvalidArgumentException: Message: invalid argument
   (Session info: chrome=104.0.5112.81)
 Stacktrace:
 Backtrace:
     Ordinal0 [0x004F5FD3+2187219]
     Ordinal0 [0x0048E6D1+1763025]
     Ordinal0 [0x003A3D40+802112]
     Ordinal0 [0x003C9171+954737]
     Ordinal0 [0x003ECB8C+1100684]
     Ordinal0 [0x003C8394+951188]
     Ordinal0 [0x003ECDA4+1101220]
     Ordinal0 [0x003FCFC2+1167298]
     Ordinal0 [0x003EC9A6+1100198]
     Ordinal0 [0x003C6F80+946048]
     Ordinal0 [0x003C7E76+949878]
     GetHandleVerifier [0x007990C2+2721218]
     GetHandleVerifier [0x0078AAF0+2662384]
     GetHandleVerifier [0x0058137A+526458]
     GetHandleVerifier [0x00580416+522518]
     Ordinal0 [0x00494EAB+1789611]
     Ordinal0 [0x004997A8+1808296]
     Ordinal0 [0x00499895+1808533]
     Ordinal0 [0x004A26C1+1844929]
     BaseThreadInitThunk [0x7635FA29+25]
     RtlGetAppContainerNamedObjectPath [0x773A7A9E+286]
     RtlGetAppContainerNamedObjectPath [0x773A7A6E+238]
 ​
 ​
 进程已结束，退出代码为 1
 ​

解决方法

• 用鼠标方法

 from selenium import webdriver  
 from selenium.webdriver import ActionChains  
   
 driver = webdriver.Chrome()  
 driver.get('http://sahitest.com/demo/php/fileUpload.htm')  
 ele_fie = driver.find_element('id','file')  
 ActionChains(driver).click(ele_fie).perform()

说明

• 不是很好解释

• 提交了问题到stackoverflow：https://stackoverflow.com/questions/73356693/why-click-method-didnt-take-effect-but-actionchains-works-fine，看看有无大神帮忙解释下。

参考答案

In the DOM I see, the input element has attribute type=file, which means it is a file upload dialog that is related to OS and Selenium cannot perform operations on this one directly. Hence ActionChains.

翻译: 的确，在网页上，input标签是有这个属性的type=file，这是一个文件上传的对话框，跟OS相关，selenium无法对该元素直接执行操作，因此(?)可以用ActionChains。