硒提取问题：等待/未找到元素 [英] Selenium Extraction Problems: Waits/Not Finding Elements

问题描述

在chrome和firefox中，一切都很好，直到我需要提取文本。我得到这个错误：

In both chrome and firefox, everything is fine up until I need to extract text. I get this error:

h3 = next(element for element in h3s if element.is_displayed())
StopIteration

我甚至添加了流畅的等待。

I even added a fluent wait.

browser = webdriver.Firefox()
browser.get('https://www.voilanorbert.com/')
inputElement = browser.find_element_by_id("form-search-name")
inputElement.send_keys(leadslist[i][0])
inputElement = browser.find_element_by_id("form-search-domain")
inputElement.send_keys(leadslist[i][1])
searchbutton = browser.find_element_by_name("search")
searchbutton.click()

wait = WebDriverWait(browser, 20)
wait.until(EC.visibility_of_element_located((By.CSS_SELECTOR, "div.results")))
wait2 = WebDriverWait(browser, 3000, poll_frequency=100, ignored_exceptions=[ElementNotVisibleException])
wait2.until(EC.presence_of_all_elements_located((By.CSS_SELECTOR, "h3.one")))
h3s = browser.find_elements_by_css_selector('h3.one')
h3 = next(element for element in h3s if element.is_displayed())
result = h3.text

，所以它只是一个空的列表。
一些图片可能会有帮助：
这是前面的图片：

I think its because its not actually extracting anything, so its just an empty list. Some pictures that will probably help: This is the before picture:

这是后图：

This is the after picture:

我需要提取什么是文本中心显示类的结果类。

/ p>

推荐答案

答案很简单，你只需要一个不同的选择器，等待搜索结果。
下面的方法（C＃）工作得很好，它会减少你的代码与几行。

The answer is fairly simple, you just need a different selector when waiting for the search result. The approach below (C#) works perfectly, it'll reduce your code with a few lines.

一个结果DIV完成。它是唯一具有文本中心显示类的元素，所以这是所有的选择器需要。
一旦显示这样的DIV，你知道在哪里精确定位H3元素（它是所述DIV的子元素）。
因此，只需等待以下元素在您点击搜索按钮后可见：

One "result DIV" becomes visible when the search is done. It is the only element with the "text-center displayed" class, so that's all your selector needs. Once such a DIV is displayed, you know where to pinpoint the H3 element (it's a child of said DIV). So simply wait for the below element to become visible after you've clicked the search button:

        IWebElement headerResult = w.Until(ExpectedConditions.ElementIsVisible(By.CssSelector("div[class=\"text-center displayed\"] h3")));
        string result = headerResult.Text;

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