Python 等待加载程序消失

我也试过这个：

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

self.wait = WebDriverWait(driver, 10)

self.wait.until(EC.invisibility_of_element_located((By.XPATH, "//*[@id='loader_mid'][contains(@style, 'display: block')]")))

我不知道如何检查，但可能我的元素总是出现在页面上，selenium认为它就在那里，唯一改变的是参数显示从无变为块。我想我可以得到像字符串这样的属性，并检查是否有单词“block”，但它是如此错误，我想。。。请帮帮我。

重申了您的答案（并进行了一些错误处理），以使人们更容易找到解决方案：）

导入所需的类：

self.wait.until_not(EC.presence_of_element_located((By.XPATH, "//*[@id='loader_mid'][contains(@style, 'display: block')]")))

配置变量：

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

代码解决方案：

SHORT_TIMEOUT  = 5   # give enough time for the loading element to appear
LONG_TIMEOUT = 30  # give enough time for loading to finish
LOADING_ELEMENT_XPATH = '//*[@id="xPath"]/xPath/To/The/Loading/Element'

---

以下代码创建一个无限循环，直到元素消失：

try:
    # wait for loading element to appear
    # - required to prevent prematurely checking if element
    #   has disappeared, before it has had a chance to appear
    WebDriverWait(driver, SHORT_TIMEOUT
        ).until(EC.presence_of_element_located((By.XPATH, LOADING_ELEMENT_XPATH)))

    # then wait for the element to disappear
    WebDriverWait(driver, LONG_TIMEOUT
        ).until_not(EC.presence_of_element_located((By.XPATH, LOADING_ELEMENT_XPATH)))

except TimeoutException:
    # if timeout exception was raised - it may be safe to 
    # assume loading has finished, however this may not 
    # always be the case, use with caution, otherwise handle
    # appropriately.
    pass 

---

使用预期条件：元素不可见

这对我来说很好

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

while True:
        try:
            WebDriverWait(driver, 1).until(EC.presence_of_element_located((By.XPATH, 'your_xpath')))
        except TimeoutException:
            break

---

您是否尝试过检查隐藏在加载程序后面的元素的可见性？是的，这对我没有帮助。但不知何故，第二种变体现在起作用了。奇怪。是的，这很奇怪。问题是，元素可能没有时间先加载，所以它会立即跳出循环并继续。此外，无限循环很少是一件好事，除非有办法取消它们，而且它们通常应该在循环中有某种睡眠，以防止资源（cpu）的过度使用。这是一个天才的答案。多年来，我一直在为这个确切的想法奋斗，这是一个完美的解决方案。非常感谢。

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

while True:
        try:
            WebDriverWait(driver, 1).until(EC.presence_of_element_located((By.XPATH, 'your_xpath')))
        except TimeoutException:
            break

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


WebDriverWait(driver, timeout).until(EC.invisibility_of_element_located((By.ID, "loader-mid")))