WebDriverWait无法按预期工作

Question

我正在使用selenium来抓取一些数据。

我单击的页面上有一个按钮，说“ custom_cols”。此按钮为我打开一个窗口，从中可以选择列。

此新窗口有时需要一些时间才能打开（大约5秒钟）。所以我已经使用了

WebDriverWait

延迟为20秒。但是有时它无法在新窗口中选择查找元素，即使该元素可见。在其余时间中，这种情况仅发生十次一次。

我在其他地方也使用了相同的功能（WebDriverWait），并且可以正常使用。我的意思是，它等待直到元素变得可见，然后在找到它时单击它。

我的问题是，即使我正在等待元素可见，为什么新窗口上的元素也不可见。要在此处添加，我尝试增加延迟时间，但有时仍会收到该错误。

我的代码在这里

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

一旦您等待该元素并在尝试调用click()方法而不是使用presence_of_element_located()method时继续前进，则需要使用
element_to_be_clickable()

以下方法：

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

更新资料

根据您在评论中的反问题，以下是这三种方法的详细信息：

present_of_element_located

present_of_element_located（locator）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).

visible_of_element_located

visible_of_element_located（locator）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

element_to_be_clickable（locator）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.