Send JavaScript code to a website using Selenium in C#

A guide on how to use Selenium in C# to send a JavaScript snippet to a website opened in the Chrome browser. The article will provide sample code and detailed explanations for each step.

In this article, we will learn how to use Selenium WebDriver to open a webpage in the Chrome browser and send a JavaScript snippet to perform some actions on that webpage. This is useful when you want to interact with a dynamic web page without modifying its source code.

C# Code

using OpenQA.Selenium;
using OpenQA.Selenium.Chrome;
using System;

namespace SeleniumExample
{
    class Program
    {
        static void Main(string[] args)
        {
            // Initialize ChromeDriver
            IWebDriver driver = new ChromeDriver();

            try
            {
                // Open the desired webpage
                driver.Navigate().GoToUrl("https://example.com");

                // JavaScript code to send
                string script = "alert('Hello from JavaScript!');";

                // Send the JavaScript code to the webpage
                IJavaScriptExecutor jsExecutor = (IJavaScriptExecutor)driver;
                jsExecutor.ExecuteScript(script);

                // Add a delay to view the result
                System.Threading.Thread.Sleep(2000);
            }
            finally
            {
                // Close the browser
                driver.Quit();
            }
        }
    }
}

Detailed explanation:

1. using OpenQA.Selenium;: Import the namespace for Selenium WebDriver.
2. using OpenQA.Selenium.Chrome;: Import the namespace for ChromeDriver.
3. static void Main(string[] args): Main method of the application.
4. IWebDriver driver = new ChromeDriver();: Initialize an instance of ChromeDriver.
5. driver.Navigate().GoToUrl("https://example.com");: Open the webpage "https://example.com".
6. string script = "alert('Hello from JavaScript!');";: JavaScript code to send.
7. IJavaScriptExecutor jsExecutor = (IJavaScriptExecutor)driver;: Cast driver to IJavaScriptExecutor to execute JavaScript.
8. jsExecutor.ExecuteScript(script);: Send the JavaScript code to the webpage.
9. System.Threading.Thread.Sleep(2000);: Pause for 2 seconds to view the result.
10. driver.Quit();: Close the browser when done.

System requirements:

• .NET Framework 4.5 or higher
• ChromeDriver compatible with your installed version of Chrome
• Selenium WebDriver library installed via NuGet

How to install the libraries needed to run the C# code above:

1. Open Visual Studio and create a new project.
2. Open Package Manager Console (Tools > NuGet Package Manager > Package Manager Console).
3. Run the following command to install Selenium WebDriver:

   Install-Package Selenium.WebDriver
   

4. Run the following command to install ChromeDriver:

   Install-Package Selenium.WebDriver.ChromeDriver
   

Tips:

• Ensure you have the ChromeDriver installed that is compatible with your version of Chrome.
• You can expand the code to send more complex JavaScript snippets or interact with specific elements on the webpage.

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