How To Execute JavaScript In Selenium WebDriver

Sometimes it is important to run JavaScript directly from the code to get any property of  Browser-BOM,  HTML-DOM  etc.

• The Browser Object Model (BOM) allows JavaScript to "talk to" the browser. It includes Window, Navigator, Screen, History, Location etc.
  
• With the HTML DOM, JavaScript can access and change all the elements of an HTML document. It includes Document, HTML, CSS, Elements etc.

We can execute JavaScript in 2 simple steps:

1. Cast the WebDriver instance to a  JavascriptExecutor
   JavascriptExecutor js = (JavascriptExecutor) driver;
   
2. Execute JavaScript
   js.executeScript("script for execution")

Example: