What is JavaScriptExecutor in Selenium? – User friendly Tech help

What is JavaScriptExecutor?
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nJavaScriptExecutor is an interface which provides mechanism to execute Javascript through selenium driver. It provides “executescript” & “executeAsyncScript” methods, to run JavaScript in the context of the currently selected frame or window. 

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Lets inject Javascript into Browser using Selenium

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Why we use it?
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nTo enhance the capabilities of the existing scripts by performing javascript injection into our application under test.
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nIn simple words  “Javascript can be executed within the browser with the help of JavaScript Executor.”
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nPackage:-
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nimport org.openqa.selenium.JavascriptExecutor;
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nSyntax:-
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JavascriptExecutor js = (JavascriptExecutor) driver;  js.executeScript(Script,Arguments);

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nscript – The JavaScript to execute
nArguments – The arguments to the script.(Optional)
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nScenario’s
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n1.How to generate Alert Pop window in selenium?
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nCode:-

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JavascriptExecutor js = (JavascriptExecutor)driver;
Js.executeScript("alert('hello world');");

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n2.How to click a button in Selenium WebDriver using JavaScript
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nCode:-

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JavascriptExecutor js = (JavascriptExecutor)driver;
js.executeScript("arguments[0].click();", element);

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n3.How to refresh browser window using Javascript ?
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nCode:-

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JavascriptExecutor js = (JavascriptExecutor)driver;
driver.executeScript("history.go(0)");

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4.How to get innertext of the entire webpage in Selenium?
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nCode:-

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JavascriptExecutor js = (JavascriptExecutor)driver;
string sText = js.executeScript("return document.documentElement.innerText;").toString();

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n5.How to get the Title of our webpage ?

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Code:-

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JavascriptExecutor js = (JavascriptExecutor)driver;
string sText = js.executeScript("return document.title;").toString();

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6.How to perform Scroll on application using  Selenium
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nCode:-

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 JavascriptExecutor js = (JavascriptExecutor)driver;
 //Vertical scroll - down by 50 pixels
 js.executeScript("window.scrollBy(0,50)");

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nNote:- for scrolling till the bottom of the page we can use the code like

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js.executeScript("window.scrollBy(0,document.body.scrollHeight)");

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7.How to click on a SubMenu which is only visible on mouse hover on Menu?
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nCode:-

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 JavascriptExecutor js = (JavascriptExecutor)driver;
 //Hover on Automation Menu on the MenuBar
 js.executeScript("$('ul.menus.menu-secondary.sf-js-enabled.sub-menu li').hover()");

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8.Implement Highlight in Selenium?
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n9.How to navigate to different page using Javascript?
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nCode:-

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JavascriptExecutor js = (JavascriptExecutor)driver;
//Navigate to new Page
js.executeScript("window.location = 'https://www.facebook.com/uftHelp'");

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nWorking Demo:-

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import java.util.concurrent.TimeUnit;
import org.openqa.selenium.JavascriptExecutor;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.firefox.FirefoxDriver;
public class JavaScriptExecuter {
 public static void main(String[] args) {
 WebDriver driver = new FirefoxDriver();
 //Launching the browser application
 driver.get("http://www.uftHelp.com");
 //Adding wait driver.manage().timeouts().implicitlyWait(20, TimeUnit.SECONDS);
 //Maximize window driver.manage().window().maximize();
 //Creating the Javascriptexecutor interface object by Type casting JavascriptExecutor js = (JavascriptExecutor)driver;
 //Fetching the Domain Name 
 String sDomain = js.executeScript("return document.domain;").toString();
 System.out.println("Domain = "+sDomain);
 //Fetching the URL 
 String sURL = js.executeScript("return document.URL;").toString();
 System.out.println("URL = "+sURL);
 //Fetching the Title
 String sTitle = js.executeScript("return document.title;").toString();
 System.out.println("Title = "+sTitle);
 //Vertical scroll - down by 200 pixels
 js.executeScript("window.scrollBy(0,200)");
 System.out.println("Successfully did the vertical scroll by 200px");  }}