如何查找div中是否有元素？

Question

我有一个帖子列表，其中一些有反应，一些没有。我想提取每个帖子的反应数量，问题是那些没有的人，没有 HTML 代码。

我尝试使用 print 进行调试。

print(len(driver.find_elements_by_xpath("//div[@class='occludable-update ember-view']")))
-----
Output: 4 - This is good, because I have 4 divs

print(len(driver.find_elements_by_xpath("//span[@class='v-align-middle social-details-social-counts__reactions-count']"))
----
Output:2 - This is good, because I have 2 posts that got reactions

当我试图查看某个帖子是否有反应时，

print(len(driver.find_elements_by_xpath("//div[@class='occludable-update ember-view']")[1].find_elements_by_xpath("//span[@class='v-align-middle social-details-social-counts__reactions-count']")))
----
Output: 2 - Why? Because the second div is empty...

HTML 代码

<div class="occludable-update ember-view">
  <ul class="social-details-social-counts ">
   <li class="social-details-social-counts__reactions social-details-social-counts__item ">
    <button class="social-details-social-counts__count-valuet " aria-label="1 Reaction’ post" type="button">
       <img class="reactions-icon social-detail">
       <span aria-hidden="true" class="v-align-middle social-details-social-counts__reactions-count">3</span>
    </button>
</li></ul>
</div>

<div class="occludable-update ember-view"> this div has no reaction </div>

<div class="occludable-update ember-view"> this div has no reaction </div>

<div class="occludable-update ember-view">
  <ul class="social-details-social-counts ">
   <li class="social-details-social-counts__reactions social-details-social-counts__item ">
    <button class="social-details-social-counts__count-valuet " aria-label="1 Reaction’ post" type="button">
       <img class="reactions-icon social-detail">
       <span aria-hidden="true" class="v-align-middle social-details-social-counts__reactions-count">3</span>
    </button>
</li></ul>
</div>

Answer 1

我发现了问题。在更好地记录自己之后，我发现使用子元素 .// 而不是 //

print(len(driver.find_elements_by_xpath("//div[@class='occludable-update ember-view']")[1].find_elements_by_xpath(".//span[@class='v-align-middle social-details-social-counts__reactions-count']")))

Answer 2

要定位延续元素，请使用 .

尝试以下：

driver.find_elements_by_xpath("//div[@class='occludable-update ember-view']")[1].find_elements_by_xpath(".//descendant::span[@class='v-align-middle social-details-social-counts__reactions-count']")

如何查找div中是否有元素？

How to find if there is an element in a div?

python-3.x

selenium

selenium-webdriver

webdriver

selenium-chromedriver