不允许使用硒化合物类名称

问题描述

我有下面的代码，点击一个元素弹出一个屏幕并复制其中的文本

el1 = driver.find_element_by_id("keyDev-A")el1.click()el2 = driver.find_element_by_class_name(内容")打印(el2.text)

但是，当我试图让 selenium 用

el3 = driver.find_element(By.CLASS_NAME, "action-btn cancel alert-display")el3.??click()

它会产生一条错误消息:

无效的选择器:不允许复合类名

这是我试图让 selenium 点击的 HTML.关闭按钮.

我应该如何编写 el3 才能点击 关闭 按钮?
 解决方案 
Leon's注释 导致不再支持复合类名称的正确信息.你可以做的是尝试使用 css 选择器.在您的情况下，以下代码行应该可以帮助您获得所需的元素:
el3 = driver.find_element_by_css_selector(".action-btn.cancel.alert-display")
它在 class 属性中找到具有所有三个类(action-btn、cancel 和 alert-display)的元素.请注意，类的顺序在这里无关紧要，任何类都可能出现在类属性中的任何位置.只要元素具有所有三个类，它就会被选中.如果要固定类的顺序，可以使用以下 xpath :
el3 = driver.find_element_by_xpath("//*[@class='action-btn cancel alert-display']")
I have the below code that clicks on an element to pop up a screen and copy the text in it
el1 = driver.find_element_by_id("keyDev-A")
el1.click()
el2 = driver.find_element_by_class_name("content")
print(el2.text)
However, when I tried to get selenium to click on the button within that popup with
el3 = driver.find_element(By.CLASS_NAME, "action-btn cancel alert-display")
el3.click()
It produces an error message:
invalid selector: Compound class names not permitted
This is the HTML that I am trying to get selenium to click on. The Close button.
<div class="nav">
    <span class="action-btn confirm prompt-display">Confirm</span>
    <span class="action-btn cancel prompt-display">Cancel</span>
    <span class="action-btn cancel alert-display">Close</span>
</div>
How should I be writing el3 in order to click on the Close button?
 解决方案 
Leon's comment leads to the correct information that compound class names are no longer supported. What you could do instead is try using css selectors. In your case, the following line of code should help you get the element you want :
el3 = driver.find_element_by_css_selector(".action-btn.cancel.alert-display")
It finds the element with all three classes (action-btn, cancel and alert-display) in the class attribute. Do note that the order of the classes does not matter here and any of the classes may appear anywhere in the class attribute. As long as the element has all three classes, it will be selected. 
If you want the order of the classes to be fixed, you can use the following xpath :
el3 = driver.find_element_by_xpath("//*[@class='action-btn cancel alert-display']")