使用 Selenium WebDriver 测试元素是否存在? [英] Test if element is present using Selenium WebDriver?

问题描述

有没有办法测试一个元素是否存在?任何 findElement 方法都会以异常结束，但这不是我想要的，因为可能元素不存在并且没关系，这不是测试失败，因此异常不能成为解决方案.

Is there a way how to test if an element is present? Any findElement method would end in an exception, but that is not what I want, because it can be that an element is not present and that is okay, that is not a fail of the test, so an exception can not be the solution.

我找到了这篇文章:Selenium c# Webdriver:等到元素出现但这是针对 C# 的，我不太擅长.谁能把代码翻译成Java?抱歉各位，我在 Eclipse 中试过了，但我没有把它正确地融入 Java 代码中.

I've found this post: Selenium c# Webdriver: Wait Until Element is Present But this is for C# and I am not very good at it. Can anyone translate the code into Java? I am sorry guys, I tried it out in Eclipse but I don't get it right into Java code.

这是代码:

public static class WebDriverExtensions{
    public static IWebElement FindElement(this IWebDriver driver, By by, int timeoutInSeconds){

        if (timeoutInSeconds > 0){
            var wait = new WebDriverWait(driver, TimeSpan.FromSeconds(timeoutInSeconds));
            return wait.Until(drv => drv.FindElement(by));
        }

        return driver.FindElement(by);
    }
}

推荐答案

使用 findElements 而不是 findElement.

findElements 将返回一个空列表.

要检查一个元素是否存在，你可以试试这个

To check that an element is present, you could try this

Boolean isPresent = driver.findElements(By.yourLocator).size() > 0

如果至少找到一个元素，则返回 true，如果不存在则返回 false.

This will return true if at least one element is found and false if it does not exist.

官方文档推荐这种方法:

findElement 不应用于查找不存在的元素，而应使用 findElements(By) 并断言零长度响应.

findElement should not be used to look for non-present elements, use findElements(By) and assert zero length response instead.

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