Utilizing JavascriptExecutor in Powershell

I've been working on a series of Powershell scripts that utilize the Selenium Webdriver.

Now, I am looking to incorporate some JavaScript functionality into one of them. However, I am struggling to understand how to get the syntax right.

I tried adapting C# code from a discussion on executing JavaScript using Selenium WebDriver:

Execute JavaScript using Selenium WebDriver in C#

Here's a snippet of my code:

# Specify path to Selenium drivers
$DriverPath = (get-item ".\" ).parent.parent.FullName + "\seleniumdriver\"
$files = Get-ChildItem "$DriverPath*.dll"

# Load all Selenium drivers
foreach ($file in $files) {
    $FilePath = $DriverPath + $file.Name
    [Reflection.Assembly]::LoadFile($FilePath) | out-null
}

# Create ChromeDriver instance
$driver = New-Object OpenQA.Selenium.Chrome.ChromeDriver

# Navigate to google.com
$driver.Url = "http://www.google.com"

# Create IJavaScriptExecutor instance
$js = New-Object IJavaScriptExecutor($driver)

# Execute Javascript to retrieve current URL title
$title = $js.executeScript("return document.title")

# Output the title to cmd
write-host $title

Unfortunately, I keep encountering an error when trying to create an instance of IJavaScriptExecutor:

"New-Object : Cannot find type [IJavaScriptExecutor]: make sure the assembly containing this type is loaded."

Can someone help me identify what I might be overlooking? Is there something wrong with my code or are there additional DLL files required?

Thanks, Christian

Answer №1

One issue that arises is the fact that IJavaScriptExecutor is an interface, meaning you cannot create an instance of it directly. You must instead instantiate a class that implements this interface. In this scenario, the ChromeDriver class is what implements this interface, allowing you to forgo creating the unnecessary $js variable and use $driver directly.

Therefore, your code would resemble the following, assuming your javascript function is functioning as intended:

# Initialize ChromeDriver object
$driver = New-Object OpenQA.Selenium.Chrome.ChromeDriver

# Navigate to google.com
$driver.Url = "http://www.google.com"

# Execute Javascript to retrieve current page title
$title = $driver.executeScript("return document.title")

For further information on these classes, refer to the Selenium Documentation.

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