Events In Javascript - Prime31

Hello,

I'm using a Prime31 plugin that allows me to get a native text field pop up in the application. The documentation is in C#, and I'm not 100% sure how to translate into JavaScript, in terms of getting an event back.

So, to activate the pop up, you do this:

 // Shows a prompt with one text field
 public static void showPromptWithOneField( string title, string message, string placeHolder, bool autocomplete )

In which, I do this:

 EtceteraBinding.showPromptWithOneField( "Title", "Message", "Holder", true );

Which works fine, but now I want to listen out for when the user presses 'Okay' on the text field. There is an event that listens out for this:

 // Fired when the user finishes entering text in the prompt
 public static event Action<string> singleFieldPromptTextEnteredEvent;

I assumed, I do this:

 function singleFieldPromptTextEnteredEvent(Action : String){
 
 }

But no luck, I have a print in there that prints the action string, but it never seems to get called. What am I doing wrong? Thanks