How to run JavaScript code on WebDriver with JavascriptExecutor in Java?

If you want run some client side JavaScript code in the same way as JavaScript code embedded in the Web page source code, you can use the JavascriptExecutor interface as describe below:

1. Load the Web page to a WebDriver object like (driver.get(url);).

2. Cast the WebDriver object to a JavascriptExecutor object like (executor = (JavascriptExecutor) driver;).

3. Execute any JavaScript code string by calling the executeScript() or executeAsyncScript() method on the JavascriptExecutor object.

Here is an example program that uses JavascriptExecutor to change the background color of the loaded Web page.

// JavascriptExecutorTest.java
// Copyright (c) FYIcenter.com 
import org.openqa.selenium.*;
public class JavascriptExecutorTest {
   public static void main(String[] args) {
      WebDriver driver = WebDriverLoader.load(args[0]);
      driver.get("http://sqa.fyicenter.com");

      try {
     Thread.sleep(3*1000);
         String script = "document.body.style.backgroundColor=\"#ffeeee\";";
         JavascriptExecutor executor = (JavascriptExecutor) driver;
         executor.executeScript(script);
     Thread.sleep(60*1000);
    } catch (Exception e) {
    }
    
      driver.quit();
   }
}

Compile and run the program, you will see that the background color of the Web page changes to pink in 3 seconds.

C:\fyicenter> javac -classpath \
   .;\fyicenter\selenium\java\client-combined-3.141.59.jar \
   JavascriptExecutorTest.java

C:\fyicenter> java -classpath \
   .;\fyicenter\selenium\java\client-combined-3.141.59.jar;\
   \fyicenter\selenium\java\libs\guava-25.0-jre.jar;\
   \fyicenter\selenium\java\libs\okhttp-3.11.0.jar;\
   \fyicenter\selenium\java\libs\okio-1.14.0.jar;\
   \fyicenter\selenium\java\libs\commons-exec-1.3.jar \
   JavascriptExecutorTest Chrome

You can also try some other JavaScript code examples list below:

      String script = "alert(\"Hello world!\")";
      String script = "confirm(\"Hello world!\")";

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