webdriver等待多个元素之一出现 [英] webdriver wait for one of a multiple elements to appear

问题描述

有没有办法让webDriverWait等待许多元素之一出现并根据出现的元素采取相应的行动?

Is there a way to get a webDriverWait to wait for one of a number of elements to appear and to act accordingly based on which element appears?

此刻，我在try循环中执行了WebDriverWait，如果发生超时异常，我将运行备用代码，等待其他元素出现.这看起来很笨拙.有没有更好的办法?这是我的代码(笨拙):

At the moment I do a WebDriverWait within a try loop and if a timeout exception occurs I run the alternative code which waits for the other element to appear. This seems clumsy. Is there a better way? Here is my (clumsy) code:

try:
    self.waitForElement("//a[contains(text(), '%s')]" % mime)
    do stuff ....
except TimeoutException:
    self.waitForElement("//li[contains(text(), 'That file already exists')]")
    do other stuff ...

这需要等待整整10秒钟，然后才能查看系统上是否已存在该文件的消息.

It involves waiting an entire 10 seconds before it looks to see if the message that the file already exists on the system.

函数waitForElement只是执行许多WebDriverWait调用，如下所示:

The function waitForElement just does a number of WebDriverWait calls like so:

def waitForElement(self, xPathLocator, untilElementAppears=True):
    self.log.debug("Waiting for element located by:\n%s\nwhen untilElementAppears is set to %s" % (xPathLocator,untilElementAppears))
    if untilElementAppears:
        if xPathLocator.startswith("//title"):
            WebDriverWait(self.driver, 10).until(lambda driver : self.driver.find_element_by_xpath(xPathLocator))
        else:
            WebDriverWait(self.driver, 10).until(lambda driver : self.driver.find_element_by_xpath(xPathLocator).is_displayed())
    else:   
        WebDriverWait(self.driver, 10).until(lambda driver : len(self.driver.find_elements_by_xpath(xPathLocator))==0)

有人有任何建议以更有效的方式实现这一目标吗?

Anybody got any suggestions to accomplish this in a more efficient way?

推荐答案

创建一个将标识符映射到xpath查询并返回匹配标识符的函数.

Create a function that takes a map of identifiers to xpath queries and returns the identifier that was matched.

def wait_for_one(self, elements):
    self.waitForElement("|".join(elements.values())
    for (key, value) in elements.iteritems():
        try:
            self.driver.find_element_by_xpath(value)
        except NoSuchElementException:
            pass
        else:
            return key

def othermethod(self):

    found = self.wait_for_one({
        "mime": "//a[contains(text(), '%s')]",
        "exists_error": "//li[contains(text(), 'That file already exists')]"
    })

    if found == 'mime':
        do stuff ...
    elif found == 'exists_error':
        do other stuff ...

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