WebDriver 的 Python 绑定中的 selenium.wait_for_condition 等效项 [英] selenium.wait_for_condition equivalent in Python bindings for WebDriver

问题描述

我正在将一些测试从 Selenium 转移到 WebDriver.我的问题是我找不到 selenium.wait_for_condition 的等价物.Python 绑定目前是否有这个，还是仍在计划中?

I'm moving some tests from Selenium to the WebDriver. My problem is that I can't find an equivalent for selenium.wait_for_condition. Do the Python bindings have this at the moment, or is it still planned?

推荐答案

目前无法将 wait_for_condition 与 WebDriver 一起使用.python selenium 代码确实提供了 DrivenSelenium 类来访问旧的 selenium 方法，但它不能做 wait_for_condition.selenium wiki 提供了一些相关信息.

Currently it isn't possible to use wait_for_condition with WebDriver. The python selenium code does provide the DrivenSelenium class for accessing the old selenium methods, but it can't do wait_for_condition. The selenium wiki has some info on that.

最好的办法是使用 WebDriverWait 类.这是一个辅助类，它定期执行一个函数，等待它返回 True.我的一般用法是

Your best bet is to use the WebDriverWait class. This is a helper class that periodically executes a function waiting for it to return True. My general usage is

driver = webdriver.Firefox()
driver.get('http://example.com')
add = driver.find_element_by_id("ajax_button")
add.click()
source = driver.page_source

def compare_source(driver):
    try:
        return source != driver.page_source
    except WebDriverException:
        pass

WebDriverWait(driver, 5).until(compare_source)
# and now do some assertions

这个解决方案绝不是理想的.. try/except 对于页面请求/响应周期延迟等待某些 ajax 活动完成的情况是必要的.如果在请求/响应周期中调用 compare_source get，它将抛出 WebDriverException.

This solution is by no means ideal.. The try/except is necessary for situations where the page request/response cycle is delayed waiting for some ajax activity to complete. If compare_source get's called in the midst of the request/response cycle it'll throw a WebDriverException.

WebDriverWait 的测试范围看看也很有帮助.

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