硒-等待元素存在，可见且可交互 [英] Selenium - wait until element is present, visible and interactable

问题描述

我有一个硒脚本(python)，单击一个答复按钮以使该类anonemail出现.出现班级anonemail所需的时间有所不同.因此，我必须使用sleep直到元素出现.我想等到班级出现，而不要使用睡眠.我听说过等待命令，但是我不知道如何使用它们.

I have a selenium script (python) that clicks a reply button to make the class anonemail appear. The time it takes for the class anonemail to appear varies. Because of that I have to use sleep until the element has appeared. I want to wait until the class has appeared instead of using sleep. I have heard about wait commands, but I don't know how to use them.

这是我到目前为止所拥有的:

This is what I have thus far:

browser.find_element_by_css_selector(".reply-button").click()
sleep(5)
email=browser.find_element_by_css_selector(".anonemail").get_attribute("value")

推荐答案

根据最佳做法:

• 如果您的用例是验证任何元素的存在，则需要诱导

• If your usecase is to validate the presence of any element you need to induce WebDriverWait setting the expected_conditions as presence_of_element_located() which is the expectation for checking that an element is present on the DOM of a page. This does not necessarily mean that the element is visible. So the effective line of code will be:

WebDriverWait(browser, 20).until(EC.presence_of_element_located((By.CSS_SELECTOR, ".reply-button"))).click()

如果用例是要提取任何元素的任何属性，则需要引入

If your usecase is to extract any attribute of any element you need to induce WebDriverWait setting the expected_conditions as visibility_of_element_located(locator) which is an expectation for checking that an element is present on the DOM of a page and visible. Visibility means that the element is not only displayed but also has a height and width that is greater than 0. So in your usecase effectively the line of code will be:

email = WebDriverWait(driver, 20).until(EC.visibility_of_element_located((By.CSS_SELECTOR, "element_css"))).get_attribute("value")

如果您的用例是对任何元素调用 click() ，则需要诱导

If your usecase is to invoke click() on any element you need to induce WebDriverWait setting the expected_conditions as element_to_be_clickable() which is an expectation for for checking an element is visible and enabled such that you can click it. So in your usecase effectively the line of code will be:

WebDriverWait(browser, 20).until(EC.element_to_be_clickable((By.CSS_SELECTOR, ".reply-button"))).click()

您可以在以下位置找到一些详细的讨论:

You can find a couple of detailed discussion in:

• WebDriverWait无法按预期工作
• 硒:检查元素的存在

• WebDriverWait not working as expected
• Selenium: Check for the presence of element

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