在用Python Selenium单击另一个按钮后出现子元素按钮时，单击该按钮？

Question

当我尝试单击仅在单击父按钮后才出现的按钮时，Selenium Webdriver的click()功能在Python中遇到了麻烦。

from selenium import webdriver
from selenium.webdriver.common.keys import Keys

url = "https://law.lexmachina.com/cases/?pending-from=2000-01-01&pending-to=2000-02-01&filters=true&tab=summary&view=analytics&cols=475"
driver.get(url)
driver = webdriver.Chrome()
elem0 = driver.find_element_by_id('export-icon-container') # this works

all_children_by_css = elem0.find_elements_by_css_selector("*") # this works, but doesn't click on the sub-button (XLS) one successfully when I run below... 
all_children_by_css[0].click() # this just makes the parent button's little window appear and disappear, the same as elem0.click() does.

>>> all_children_by_css[0] # this is the webElement that I thought was for the XLS button
<selenium.webdriver.remote.webelement.WebElement (session="6b4a559408fa4d512f8596759d81eaf7", 
element="d83be2ca-c879-4706-85ef-db7120d345a3")>

基本上，我想通过Webdriver导出XLS文件，以便以后可以在循环中使用数据过滤器的URL进行操作。

我在下面提供了带注释的屏幕截图，其中详细说明了我要单击的按钮以及与之关联的检查代码。

Answer 1

我建议查看页面上是否有直接导出的API。如果没有，您可能需要动态等待。您可以尝试以下类似方法。

from selenium import webdriver
from selenium.webdriver.common.keys import Keys
from selenium.webdriver.support import expected_conditions as EC
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.common.by import By

driver = webdriver.Chrome()
url = "https://law.lexmachina.com/cases/?pending-from=2000-01-01&pending-to=2000-02-01&filters=true&tab=summary&view=analytics&cols=475"
driver.get(url)

#Click on Export Icon
elem0 = driver.find_element_by_id('export-icon-container').click() 

#Wait for XLS option to show up
wait = WebDriverWait(driver, 10)
ExportOption= wait.until(EC.element_to_be_clickable((By.XPATH, "//button[@data-action='export-item'][contains(text(),'XLS')]")))
ExportOption.click()