How to Scroll Up or Down a Page Using Selenium WebDriver in Java?

How can I scroll up or down a webpage using Selenium WebDriver in Java?

selenium.getEval("scrollBy(0, 250)");

Scrolling a webpage using Selenium WebDriver is a common task that can be easily accomplished using Java. Unlike Selenium RC, which utilized 'getEval' methods, WebDriver offers a more straightforward API for performing page scrolling, using JavaScript execution or the Actions class.

JavascriptExecutor js = (JavascriptExecutor) driver;
js.executeScript("window.scrollBy(0,250)"); // Scroll down 250 pixels
js.executeScript("window.scrollBy(0,-250)"); // Scroll up 250 pixels

Causes

• You previously could scroll using outdated methods like `selenium.getEval` in older versions of Selenium RC.
• Migrating to Selenium WebDriver requires learning new methods for performing similar tasks.

Solutions

• Use the JavaScript executor for scrolling using the `JavascriptExecutor` interface.
• Utilize the `Actions` class to achieve smooth scrolling effects.

Mistake: Using outdated Selenium RC methods in WebDriver programs.

Solution: Ensure to adapt to WebDriver practices, such as using `JavascriptExecutor` or the `Actions` class for scrolling.

Mistake: Not casting the WebDriver instance to `JavascriptExecutor`.

Solution: Always cast the driver instance appropriately when using JavascriptExecutor.