Selenium Java：获取指定文本tr元素data-key属性值的方法

Hey there! Let's break down why you're getting null here and fix it right away.

The core issue is simple: you're currently locating the <td> element that holds the text "Some name", but the data-key attribute you want is on its parent <tr> element. When you call elem.getAttribute("data-key") on the <td>, it's checking for that attribute on the wrong element—so it returns null as expected.

Here are a few straightforward solutions to get the correct attribute value:

Solution 1: Directly locate the parent <tr> element #

Adjust your XPath to target the <tr> that contains a child <td> with your target text. You can use either of these valid XPath expressions:

• //tr[td[text()='Some name']] (Finds a <tr> where any child <td> has the exact text)
• //td[text()='Some name']/parent::tr (Locates the <td> first, then navigates up to its parent <tr>)

Update your test code like this:

@Test
public void test() throws Exception {
    driver.navigate().to("some url");
    // Target the <tr> element directly
    WebElement trElem = driver.findElement(By.xpath("//tr[td[text()='Some name']]"));
    String val = trElem.getAttribute("data-key");
    System.out.print(val); // This should now return "20"
}

Solution 2: Navigate from the <td> to its parent <tr> #

If you need to keep the initial <td> locator for any reason, you can fetch the parent <tr> after locating the <td>:

@Test
public void test() throws Exception {
    driver.navigate().to("some url");
    WebElement tdElem = driver.findElement(By.xpath("//*[text() = 'Some name']"));
    // Traverse up to the parent <tr>
    WebElement trElem = tdElem.findElement(By.xpath("./parent::tr"));
    String val = trElem.getAttribute("data-key");
    System.out.print(val);
}

Bonus: Handle timing issues (if needed) #

If you still run into problems, it might be because the element isn't fully loaded when you try to access it. Use an explicit wait to ensure the <tr> is visible before interacting with it:

import org.openqa.selenium.support.ui.WebDriverWait;
import org.openqa.selenium.support.ui.ExpectedConditions;
import java.time.Duration;

@Test
public void test() throws Exception {
    driver.navigate().to("some url");
    WebDriverWait wait = new WebDriverWait(driver, Duration.ofSeconds(10));
    WebElement trElem = wait.until(
        ExpectedConditions.visibilityOfElementLocated(By.xpath("//tr[td[text()='Some name']]"))
    );
    String val = trElem.getAttribute("data-key");
    System.out.print(val);
}

Note on robust text matching #

If the <td> might have extra whitespace around "Some name", use these XPath tweaks to make the match more reliable:

• //tr[td[contains(text(), 'Some name')]] (Matches any <td> that includes the text)
• //tr[td[normalize-space(text())='Some name']] (Trims whitespace before checking for an exact match)

内容的提问来源于stack exchange，提问作者Daria