如何在定位元素之前等待框架加载? [英] How to wait for a frame to load before locating an element?

问题描述

我试图等待Selenium切换变化的帧，然后再等待另一个元素.即

I'm trying to wait for Selenium to switch changing frames before waiting on another element. I.e.

var wait = new WebDriverWait(driver, 15);
wait.Until(ExpectedConditions.FrameToBeAvailableAndSwitchToIt(By.Id("frameA"));

var wait2 = new WebDriverWait(driver, 15);
// wait for element within frameA to exist
wait2.Until(ExpectedConditions.ElementExists(By.Id("elementA")));

如果我在第二次等待之前扔了一个简单的Thread.Sleep(1000);，它就可以正常工作，但是如果没有，我会得到以下错误:

If I toss in a simple Thread.Sleep(1000); before the second wait it functions fine, but without that I get the following error:

'unknown error: unhandled inspector error: {"code":-32000,"message":"Cannot find context with specified id"}
    enter code here

在等待填充该框架中的元素之前，是否有更好的方法来等待框架上下文切换完成?

Is there a better way to wait for the frame context to switch finishing before waiting for an element within that frame to be populated?

推荐答案

您需要考虑以下几点:

切换到框架的代码行看起来很完美，不会引发任何错误:

The line of code to switch to the frame looks perfect which doesn't throws any error :

var wait = new WebDriverWait(driver, 15);
wait.Until(ExpectedConditions.FrameToBeAvailableAndSwitchToIt(By.Id("frameA"));

在下一行中，您尝试了 ExpectedConditions 方法 ElementExists .根据 API文档 > ElementExists 方法定义为:

In the next line you have tried the ExpectedConditions method ElementExists. As per the API Docs ElementExists Method is defined as :

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.

硒不能与元素交互，直到元素可见.因此，您需要使用方法 ElementIsVisible 如下:

Selenium can't interact with elements until the element is visible. Hence you need to use the method ElementIsVisible as follows :

var wait2 = new WebDriverWait(driver, 15);
wait2.Until(ExpectedConditions.ElementIsVisible(By.Id("elementA")));

在这里您可以找到有关交易方式的详细讨论在iframe下使用#document

Here you can find a detailed discussion on Ways to deal with #document under iframe

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