java - 使用另一个 WebElement 时获取 WebElement

Question

我正在尝试使用 Selenium 获取另一个提取元素内的元素。但我得到了意想不到的结果。例如，下面的代码在循环中返回相同的“数据时间”和推文时间。请注意“data-item-id”如何不同，但“data-time”是相同的。我试图获取与循环中的元素相关的“数据时间”。知道我的错误是什么吗？

    driver.get("https://twitter.com/CNN");

    List<WebElement> tweets = driver.findElements(By.xpath("//li[contains(@class, 'js-stream-item')]"));

    for (int i = 0; i < tweets.size(); i++) {
        System.out.println(tweets.get(i).getAttribute("data-item-id"));
        WebElement tweetTime = tweets.get(i).findElement(By.xpath("//div[1]/div[2]/div[1]/small/a/span"));
        System.out.println(tweetTime.getAttribute("data-time"));
        System.out.println(tweetTime.getText());
        System.out.println("-----------------------------------");
    }

输出

964597320301121536
1518812897
Feb 16
-----------------------------------
966636880702840834
1518812897
Feb 16
-----------------------------------
966638057217757184
1518812897
Feb 16
-----------------------------------
966636332721360896
1518812897
Feb 16
-----------------------------------
966633486797942784
1518812897
Feb 16
-----------------------------------
966630573740523520
1518812897
Feb 16
-----------------------------------
966627896474460160
1518812897
Feb 16
-----------------------------------
966624849732034560
1518812897
Feb 16
-----------------------------------
966622030526402561
1518812897
Feb 16
-----------------------------------
966611062052343808
1518812897
Feb 16
-----------------------------------
966605886792830976
1518812897
Feb 16
-----------------------------------
966604093719482373
1518812897
Feb 16
-----------------------------------
966602318522265600
1518812897
Feb 16
-----------------------------------
966600547364233216
1518812897
Feb 16
-----------------------------------
966598713903865857
1518812897
Feb 16
-----------------------------------
966594943216242688
1518812897
Feb 16
-----------------------------------
966591153700245505
1518812897
Feb 16
-----------------------------------
966587390805577730
1518812897
Feb 16
-----------------------------------
966587263147741185
1518812897
Feb 16
-----------------------------------
966585227618541568
1518812897
Feb 16
-----------------------------------
966583600673099777
1518812897
Feb 16
-----------------------------------

Answer 1

这是常见问题:要在每个 tweets.get(i) 中查找元素，您应该在 XPath 的开头指定代表当前节点(上下文)的点:

".//div[1]/div[2]/div[1]/small/a/span"  # first node found inside current tweet

而不是

"//div[1]/div[2]/div[1]/small/a/span"  # first node found in DOM