scroll down in javascript selenium code example

Example 1: scroll down selenium java

import org.openqa.selenium.JavascriptExecutor;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.chrome.ChromeDriver;
import org.testng.annotations.Test;

public class ScrollByPixel {

    WebDriver driver;
    @Test
    public void ByPixel() {
        System.setProperty("webdriver.chrome.driver", "E://Selenium//Selenium_Jars//chromedriver.exe");
        driver = new ChromeDriver();

        JavascriptExecutor js = (JavascriptExecutor) driver;

        // Launch the application		
        driver.get("http://demo.guru99.com/test/guru99home/");

        //To maximize the window. This code may not work with Selenium 3 jars. If script fails you can remove the line below		
        driver.manage().window().maximize();

        // This  will scroll down the page by  1000 pixel vertical		
        js.executeScript("window.scrollBy(0,1000)");
    }
}

Example 2: scroll down in selenium

Selenium does not have a method for scrolling
but there are some ways to scroll:
#1 ->=moveToElement= coming from Actions class
   will scroll down and up to given web element
#2 Using JSExecutor: We can inject JavaScript
   code in our Java+Selenium code using JSExecutor
   which helps us scroll up, down, left, right.
   We need to create instance of JS executor,
   then cast our driver type of it.
WebDriver driver = new ChromeDriver(); 
JavascriptExecutor jse = (JavascriptExecutor)driver;
jse.executeScript("scroll(0, 250);"); Scroll Down
jse.executeScript("scroll(0,-250);"); Scroll Up

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Java Example