“ExpectedConditions.visibilityOfElementLocated”与“ExpectedConditions.visibilityOfElementLocated”之间的确切区别是什么？和“ExpectedConditions.presenceOfElementLocated”和“ExpectedConditions.presenceOfElementLocated” [英] What is the exact difference between "ExpectedConditions.visibilityOfElementLocated" and "ExpectedConditions.presenceOfElementLocated"

问题描述

如果我的问题听起来很重要，我提前道歉，我在QA和Selenium非常新。

My apologies in advance if my question sounds primary, I am very new at QA and Selenium.

之间的确切区别是：

 wait.until(ExpectedConditions.visibilityOfElementLocated
                    (By.xpath("//a[text()='Show advanced settings...']"))).click();

和

 wait.until(ExpectedConditions.presenceOfElementLocated
                    (By.xpath("//a[text()='Show advanced settings...']"))).click();

我看了这里但是没弄明白。

推荐答案

visibilityOfElmementLocated检查元素是否存在且是否可见。要检查可见性，请确保元素的高度和宽度大于0.

The visibilityOfElmementLocated checks to see if the element is present and also visible. To check visibility it makes sure the element has a height and width greater than 0.

presenceOfElementLocated只检查dom以查看它是否可以定位元素，无论其可见性如何。

The presenceOfElementLocated just checks the dom to see if it can locate an element no matter its visibility.

资料来源：
https://selenium.googlecode.com/git/docs/api/java/org/openqa/selenium/support/ui/ExpectedConditions .html＃visibilityOf-org.openqa.selenium.WebElement-

visibilityOf
public static ExpectedCondition visibilityOf（WebElement element）
An期望检查已知存在于页面的DOM上的元素是否可见。 可见性意味着该元素不仅会显示，而且其高度和宽度也会大于0.
参数：

visibilityOf public static ExpectedCondition visibilityOf(WebElement element) An expectation for checking that an element, known to be present on the DOM of a page, is visible. Visibility means that the element is not only displayed but also has a height and width that is greater than 0. Parameters:

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