How to scroll down a page using JavaScript in Selenium?

Q: How to scroll down a page using JavaScript in Selenium?

Scrolling Down a Page Using JavaScript in Selenium Use JavascriptExecutor to execute JavaScript''s window.scrollBy() function to scroll the page by a specified pixel offset. Basic scroll down: java JavascriptExecutor js = (JavascriptExecutor) driver; js.executeScript("window.scrollBy(0, 500)"); // Scroll down 500 pixels Syntax: window.scrollBy(x, y) - x = horizontal scroll (pixels) — use 0 for vertical-only scroll - y = vertical scroll (pixels) — positive = down, negative = up Common scroll patterns: java JavascriptExecutor js = (JavascriptExecutor) driver; // Scroll down 500px js.executeScrip

Use JavascriptExecutor with window.scrollBy(x, y) to scroll the page by a specified number of pixels in Selenium.

Answer

Scrolling Down a Page Using JavaScript in Selenium

Use JavascriptExecutor to execute JavaScript''s window.scrollBy() function to scroll the page by a specified pixel offset.

Basic scroll down:

Java

JavascriptExecutor js = (JavascriptExecutor) driver;
js.executeScript("window.scrollBy(0, 500)");  // Scroll down 500 pixels

▸Syntax: window.scrollBy(x, y)

✓x = horizontal scroll (pixels) — use 0 for vertical-only scroll
✓y = vertical scroll (pixels) — positive = down, negative = up

Common scroll patterns:

Java

JavascriptExecutor js = (JavascriptExecutor) driver;

// Scroll down 500px
js.executeScript("window.scrollBy(0, 500)");

// Scroll up 300px
js.executeScript("window.scrollBy(0, -300)");

// Scroll to bottom of page
js.executeScript("window.scrollTo(0, document.body.scrollHeight)");

// Scroll to top of page
js.executeScript("window.scrollTo(0, 0)");

// Scroll to specific coordinates
js.executeScript("window.scrollTo(0, 1000)");

Full test example:

Java

@Test
public void scrollTest() {
    driver.get("https://example.com/long-page");

    JavascriptExecutor js = (JavascriptExecutor) driver;

    // Scroll down to load lazy content
    js.executeScript("window.scrollBy(0, 500)");
    Thread.sleep(1000);

    // Verify element is now visible after scroll
    WebElement element = driver.findElement(By.id("lazy-section"));
    Assert.assertTrue(element.isDisplayed());

    // Scroll back to top
    js.executeScript("window.scrollTo(0, 0)");
}

When to use JavaScript scrolling:

✓Elements that load lazily as you scroll
✓Infinite scroll pages
✓Fixed headers blocking element interaction
✓Elements not interactable until scrolled into view

Alternative — Actions class scroll (Selenium 4):

Java

// Selenium 4+
Actions actions = new Actions(driver);
actions.scrollByAmount(0, 500).perform();

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