使用Selenium WebDriver等待元素的属性更改值 [英] Using selenium webdriver to wait the attribute of element to change value
问题描述
我有一个属性为"aria-busy"的元素,当进行数据搜索和处理时,该元素从true变为false.如果达到20秒并且属性未从true更改为false,我如何使用硒预期条件和显式等待来等待默认时间(例如20秒).抛出异常.我有关注者,但它确实不起作用
I have one element with attribute "aria-busy" that changes from true to false when data is in searching and done. How can I use selenium Expected Conditions and Explicit Waits to wait a default time like 20 seconds, if 20 seconds reaches and the attribute is not changed from true to false. throw exceptions. I have following, but it does not really work
import selenium.webdriver.support.ui as ui
from selenium.webdriver.support import expected_conditions as EC
<div id="xxx" role="combobox" aria-busy="false" /div>
class Ele:
def __init__(self, driver, locator)
self.wait = ui.WebDriverWait(driver, timeout=20)
def waitEle(self):
try:
e = self.driver.find_element_by_xpath('//div[@id='xxxx']')
self.wait.until(EC.element_selection_state_to_be((e.get_attribute('aria-busy'), 'true')))
expect:
raise Exception('wait timeout')
推荐答案
期望条件只是可调用,您可以将其定义为简单函数:
An Expected Condition is just a callable, you can define it as a simple function:
def not_busy(driver):
try:
element = driver.find_element_by_id("xxx")
except NoSuchElementException:
return False
return element.get_attribute("aria-busy") == "false"
self.wait.until(not_busy)
不过,有些通用和模块化的做法是遵循内置的预期条件"的样式,并创建一个覆盖的__call__()
魔术方法:
A bit more generic and modular, though, would be to follow the style of the built-in Expected Conditions and create a class with a overriden __call__()
magic method:
from selenium.webdriver.support import expected_conditions as EC
class wait_for_the_attribute_value(object):
def __init__(self, locator, attribute, value):
self.locator = locator
self.attribute = attribute
self.value = value
def __call__(self, driver):
try:
element_attribute = EC._find_element(driver, self.locator).get_attribute(self.attribute)
return element_attribute == self.value
except StaleElementReferenceException:
return False
用法:
self.wait.until(wait_for_the_attribute_value((By.ID, "xxx"), "aria-busy", "false"))
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