How to create custom event when a user clicks on a hyperlink in a PDF file.

I'm new to Acrobat customizations. In our environment, we receive a lot of PDF files created externally that contain relative hyperlinks between documents. For a variety of reasons, we would like to perform a custom action when a user clicks on one of the hyerlinks. I've investigated creating a Javascript plugin but haven't gotten it to work. A code generator provided the below, which I placed into C:\Program Files\Adobe\Acrobat DC\Acrobat\Javascripts but it produces a "TypeError: this.addEvent is not a function" error.

Is the custom behavior on hyperlink click even possible to do in Javascript?

Thx.

// Filename: hyperlink_action.js

// Define the custom action to be performed when a hyperlink is clicked.
function customHyperlinkAction(event) {
// Get the URL of the clicked hyperlink.
var url = event.target.URL;

// Perform your custom action based on the URL.
// Examples:

// 1. Open the URL in a new window/tab (default behavior, but included for clarity):
// app.openURL(url);

// 2. Display an alert box with the URL:
app.alert("Clicked hyperlink: " + url);

// 3. Check if the URL matches a specific pattern and perform a different action:
if (url.startsWith("https://www.example.com")) {
app.alert("This link goes to Example.com!");
// You could perform a more complex action here, like opening a specific file
// or executing a different JavaScript function.
} else if (url.startsWith("internal://")) { // Example of a custom "internal" protocol
// Handle "internal" links differently. For example:
var internalPath = url.substring("internal://".length);
app.alert("Handling internal link: " + internalPath);
// You might have a way to process these, like looking up data based on the path.
} else {
// Default action: open the URL
app.alert("I am here!");
//app.openURL(url);
}

// 4. Modify form fields based on the URL (more advanced):
// if (url.includes("data_id=123")) {
// var field = this.getField("FieldName");
// if (field) {
// field.value = "New Value based on URL";
// }
// }

// 5. Log the click to the console (useful for debugging):
console.println("Hyperlink clicked: " + url);

}

// Add a document-level event listener for hyperlink clicks.
// This is the key part that makes the extension work. It intercepts
// hyperlink clicks before they are handled by the default behavior.
this.addEvent("HyperlinkClicked", customHyperlinkAction);

// Optional: Add a menu item to test the functionality (for development/testing).
// This is not necessary for the extension to work; the event listener above is what does the work.
var menuItem = {
cName: "Test Hyperlink Action", // Menu item name
cParent: "Tools", // Add it to the "Tools" menu
cExec: "console.println('Test menu item clicked.');" // Simple test action
};
app.addMenuItem(menuItem);

// Optional: Code to be executed when the extension is loaded.
console.println("Hyperlink Action Extension Loaded.");