WebDriverWait未按预期工作

Question

我正在使用selenium来抓取一些数据。

有按钮在页面上，我点击说"custom_cols“。这个按钮为我打开一个窗口，在那里我可以选择我的列。

这个新窗口有时需要一些时间来打开(大约5秒)。为了处理这件事我用了

WebDriverWait 

延迟20秒。但是，有时它无法在新窗口中选择find元素，即使元素是可见的。在剩余的时间里，这种情况只发生一次-它正常工作。

我在其他地方也使用了相同的函数(WebDriverWait)，这是预期的工作。我的意思是，它等待直到元素变得可见，然后点击它的时候，它找到它。

我的问题是，为什么新窗口上的元素是不可见的，即使我在等待元素变得可见。添加这里，我尝试增加延迟时间，但我仍然偶尔得到这个错误。

我的密码在这里

def wait_for_elem_xpath(self, delay = None, xpath = ""):
    if delay is None:
        delay = self.delay

    try:
        myElem = WebDriverWait(self.browser, delay).until(EC.presence_of_element_located((By.XPATH , xpath)))
    except TimeoutException:
        print ("xpath: Loading took too much time!")
    return myElem
select_all_performance = '//*[@id="mks"]/body/div[7]/div[2]/div/div/div/div/div[2]/div/div[2]/div[2]/div/div[1]/div[1]/section/header/div'
self.wait_for_elem_xpath(xpath = select_all_performance).click()

Answer 1

一旦您等待元素并在尝试调用click()方法而不是使用presence_of_element_located()方法时向前迈进，您需要使用element_to_be_clickable()，如下所示：

try:
    myElem = WebDriverWait(self.browser, delay).until(EC.element_to_be_clickable((By.XPATH , xpath)))

更新

根据您在评论中的反问，这里有三种方法的详细内容：

presence_of_element_located

定位(定位器)的定义如下：

class selenium.webdriver.support.expected_conditions.presence_of_element_located(locator)

Parameter : locator - used to find the element returns the WebElement once it is located

Description : An expectation for checking that an element is present on the DOM of a page. This does not necessarily mean that the element is visible or interactable (i.e. clickable). 

visibility_of_element_located

定位(定位器)的定义如下：

class selenium.webdriver.support.expected_conditions.visibility_of_element_located(locator)

Parameter : locator -  used to find the element returns the WebElement once it is located and visible

Description : An expectation for checking that an element is present on the DOM of a page and visible. Visibility means that the element is not only displayed but also has a height and width that is greater than 0.

element_to_be_clickable

可点击(定位器)的定义如下：

class selenium.webdriver.support.expected_conditions.element_to_be_clickable(locator)

Parameter : locator - used to find the element returns the WebElement once it is visible, enabled and interactable (i.e. clickable).

Description : An Expectation for checking an element is visible, enabled and interactable such that you can click it.