What is a JavaScriptExecutor?

The JavaScriptExecutor interface enables you to execute JavaScript code through the Selenium WebDriver API. The JavaScript language itself is used to interact with HTML in a browser, and this function is required when using Selenium.

Selenium WebDriver's JavaScriptExecutor interface executes JavaScript code through the browser. The JavascriptExecutor class provides two methods for executing JavaScript code: ExecuteScript and ExecuteAsyncScript.

• ExecuteScript:

With this method, you can execute JavaScript in the currently selected window or frame. The script runs as an anonymous function, and it can return values. Data types returned are:

• WebElement
• List
• String
• Long
• Boolean
• ExecuteAsyncScript:

This method executes asynchronous JavaScript in the current window or frame. The asynchronous script runs as a single thread, allowing other page elements to load and parse simultaneously with the script. This enhances the performance of your site.