为什么看起来像水豚“等待页面加载”？计时器适用于匹配器，但不适用于查找器？ [英] Why does it seem like the Capybara "wait for page to load" timer works for matchers but not finders?

问题描述

我目前正在运行一项测试，检查特定元素，然后对其进行处理。该元素需要花费一些时间才能完成javascript的播放，但是在计时器内，我已经设置了水豚。

I'm currently running a test that checks for a specific element and then do some stuff to it. The element takes a little for the javascript to finish kicking in, but well within the timer I've got Capybara set for.

出于某种原因

assert session.has_xpath?(xpath_route)

工作正常，但

assert link=session.first(:xpath, xpath_route)

失败，表示找不到元素。很快-在等待计时器用完之前很久。

fails, saying it could not find the element. And quickly - long before the wait timer would run out.

我只能假设这意味着计时器仅适用于匹配器，而不是查找器，这很好，但是如何我强迫它继续查找，直到找到我要查找的元素为止。

I can only assume this means the timer only applies to matchers, not finders, which is fine, but how can I force it to keep looking until it finds the element I'm looking for?

推荐答案

假设超时确实是正确的，您是正确的首先使用 时不适用。但是您可以使用 wait_until 方法，该方法将一直重试直到超时到期或该块返回真实值为止，因此：

You are correct assuming that the timeout does not apply when using first. But you can use the wait_until method, which will keep retrying until either the timeout expires, or the block returns something truthy, so:

page.wait_until() do
  session.first(:xpath, xpath_route)
end

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