為什麼 Selenium WebDriver 會拋出陳舊元素引用異常？

Selenium WebDriver: Tackling Stale Element Reference Exception

In this article, we delve into the issue of Stale Element Reference Exception encountered in Selenium WebDriver tests. We examine a real-life scenario and provide insights on how to overcome this exception effectively.

Scenario:

Consider the following Selenium WebDriver test:

// Find the text input element by its name
WebElement element = driver.findElement(By.name("createForm:dateInput_input"));

Execution of this line might occasionally result in a Stale Element Reference Exception. The exception occurs when the element is destroyed and recreated during the page's dynamic behavior.

Understanding Stale Element Reference Exception:

A WebElement represents an element in the Document Object Model (DOM), which serves as the blueprint of a webpage. As users interact with a modern web page, elements in the DOM are often dynamically modified, leading to destruction and recreation. This can render existing WebElement references stale, as their associated element in the DOM no longer exists.

Resolving the Exception:

To resolve this issue, it is essential to refresh the stale WebElement reference. This can be achieved by invoking a new findElement() method to locate the element again based on its unique identifier, such as name or ID:

WebElement textElement = driver.findElement(By.name("createForm:dateInput_input"));

Conclusion:

Understanding the Stale Element Reference Exception is crucial for writing robust Selenium WebDriver tests. By being aware of the causes and applying suitable techniques like refreshing stale references, you can ensure reliable test execution even in dynamic web environments.

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