python - 如何在 jupyterhub 页面中使用 python-selenium 查找现有的 HTML 元素？

Question

我在 HTML 页面中有以下构造，我想选择 li元素(使用 python-selenium):

<li class="p-Menu-item p-mod-disabled" data-type="command" data-command="notebook:run-all-below">
    <div class="p-Menu-itemIcon"></div>
    <div class="p-Menu-itemLabel" style="">Run Selected Cell and All Below</div>
    <div class="p-Menu-itemShortcut" style=""></div>
    <div class="p-Menu-itemSubmenuIcon"></div>
</li>

我正在使用以下 xpath:

//li[@data-command='notebook:run-all-below']

但似乎没有找到该元素。
完整的、最小的工作示例代码:

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

driver = webdriver.Firefox()
driver.get("https://mybinder.org/v2/gh/jupyterlab/jupyterlab-demo/master?urlpath=lab/tree/demo")

# Wait for the page to be loaded
xpath = "//button[@title='Save the notebook contents and create checkpoint']"
element = WebDriverWait(driver, 600).until(
    EC.presence_of_element_located((By.XPATH, xpath))
)
time.sleep(10)
print("Page loaded")

# Find and click on menu "Run"
xpath_run = "//div[text()='Run']"
element = WebDriverWait(driver, 60).until(
    EC.element_to_be_clickable((By.XPATH, xpath_run))
)
element.click()
print("Clicked on 'Run'")

# Find and click on menu entry "Run Selected Cell and All Below"
xpath_runall = "//li[@data-command='notebook:run-all-below']"
element = WebDriverWait(driver, 600).until(
    EC.element_to_be_clickable((By.XPATH, xpath_runall))
)
print("Found element 'Run Selected Cell and All Below'")
element.click()
print("Clicked on 'Run Selected Cell and All Below'")

driver.close()

环境:

MacOS Mojave (10.14.6)

python 3.8.6

Selenium 3.8.0

壁虎驱动 0.26.0

附录
我一直在尝试使用 Firefox“Selenium IDE”插件记录这些步骤，该插件为 python 提供了以下步骤:

sdriver.get("https://hub.gke2.mybinder.org/user/jupyterlab-jupyterlab-demo-y0bp97e4/lab/tree/demo")
driver.set_window_size(1650, 916)
driver.execute_script("window.scrollTo(0,0)")
driver.find_element(By.CSS_SELECTOR, ".lm-mod-active > .lm-MenuBar-itemLabel").click()

当然，这也行不通。使用该代码行我得到一个错误

selenium.common.exceptions.NoSuchElementException: Message: Unable to locate element: .lm-mod-active > .lm-MenuBar-itemLabel

Answer 1

你离得够近了。事实上，您的整个程序只有一个问题，如下所示:

xpath_runall = "//li[@data-command='notebook:run-all-below']"由于第一个匹配的元素是 ，因此不会将带有文本的可见元素唯一标识为 Run Selected Cell 和 All Above隐藏 元素。

其他注意事项
更多优化:

标识为 xpath = "//button[@title='Save the notebook contents and create checkpoint']" 的元素是 可点击元素。所以而不是 EC 为 presence_of_element_located()您可以使用 element_to_be_clickable()

一旦元素通过 EC 返回为 element_to_be_clickable()您可以调用 click()在同一条线上。

xpath将带有文本的元素标识为 Run Selected Cell 和 All below 将是:

//li[@data-command='notebook:run-all-below']//div[@class='lm-Menu-itemLabel p-Menu-itemLabel' and text()='Run Selected Cell and All Below']

作为application通过 JavaScript 构建您需要使用 ActionChains .

解决方案
您的优化解决方案将是:

代码块:

from selenium import webdriver
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.common.by import By
from selenium.webdriver.support import expected_conditions as EC
from selenium.webdriver.common.action_chains import ActionChains

driver = webdriver.Firefox(executable_path=r'C:\WebDrivers\geckodriver.exe')
driver.get("https://mybinder.org/v2/gh/jupyterlab/jupyterlab-demo/master?urlpath=lab/tree/demo")
WebDriverWait(driver, 60).until(EC.element_to_be_clickable((By.XPATH, "//button[@title='Save the notebook contents and create checkpoint']")))
print("Page loaded")
WebDriverWait(driver, 20).until(EC.element_to_be_clickable((By.XPATH, "//div[text()='Run']"))).click()
print("Clicked on Run")
element = WebDriverWait(driver, 20).until(EC.element_to_be_clickable((By.XPATH, "//li[@data-command='notebook:run-all-below']//div[@class='lm-Menu-itemLabel p-Menu-itemLabel' and text()='Run Selected Cell and All Below']")))
ActionChains(driver).move_to_element(element).click(element).perform()
print("Clicked on Run Selected Cell and All Below")

控制台输出:

Page loaded
Clicked on Run
Clicked on Run Selected Cell and All Below