Execute Acrobat JavaScript Code when a Button is Clicked

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Http;

// Use EVO PDF Namespace
using EvoPdfClient;

namespace EvoHtmlToPdfDemo.Controllers.PDF_Creator.PDF_Actions
{
    public class PDF_Creator_Execute_JavaScript_Button_ClickedController : Controller
    {
        [HttpPost]
        public ActionResult CreatePdf(IFormCollection collection)
        {
            // Get the server options
            string serverIP = collection["textBoxServerIP"];
            uint serverPort = uint.Parse(collection["textBoxServerPort"]);
            string servicePassword = collection["textBoxServicePassword"];
            bool useServicePassword = servicePassword.Length > 0;
            bool useTcpService = collection["ServerType"] == "radioButtonUseTcpService";
            string webServiceUrl = collection["textBoxWebServiceUrl"];

            // Create a PDF document
            Document pdfDocument = null;
            if (useTcpService)
                pdfDocument = new Document(serverIP, serverPort);
            else
                pdfDocument = new Document(true, webServiceUrl);

            // Set optional service password
            if (useServicePassword)
                pdfDocument.ServicePassword = servicePassword;

            // Set license key received after purchase to use the converter in licensed mode
            // Leave it not set to use the converter in demo mode
            pdfDocument.LicenseKey = "4W9+bn19bn5ue2B+bn1/YH98YHd3d3c=";

            // Add a page to PDF document
            PdfPage pdfPage = pdfDocument.AddPage();

            // The titles font used to mark various sections of the PDF document
            PdfFont titleFont = new PdfFont("Times New Roman", 8, true);

            TextElement titleTextElement = new TextElement(5, 5, "Execute an Acrobat JavaScript code when the button below is clicked. Using a JavaScript code you can open the print dialog, display an alert message or set the document zoom level in PDF viewer.", titleFont);
            pdfPage.AddElement(titleTextElement);

            PdfPage buttonPdfPage = pdfDocument.GetPage(0);
            RectangleFloat buttonRectangle = new RectangleFloat(5, 40, 100, 20);

            // The font used for buttons text in PDF document
            PdfFont buttonTextFont = new PdfFont("Times New Roman", 8, true);

            // Create a PDF form button
            PdfFormButton pdfButton = new PdfFormButton(buttonRectangle, "Execute Acrobat JavaScript", buttonTextFont);
            pdfButton.Style.BackColor = RgbColor.Beige;
            pdfDocument.Form.AddButton(buttonPdfPage, pdfButton);

            // Set JavaScript action to be executed when the button is clicked
            string javaScript = null;
            if (collection["JavaScriptAction"] == "alertMessageRadioButton")
            {
                // JavaScript to display an alert mesage 
                javaScript = String.Format("app.alert(\"{0}\")", collection["alertMessageTextBox"]);
            }
            else if (collection["JavaScriptAction"] == "printDialogRadioButton")
            {
                // JavaScript to open the print dialog
                javaScript = "print()";
            }
            else if (collection["JavaScriptAction"] == "zoomLevelRadioButton")
            {
                // JavaScript to set an initial zoom level 
                javaScript = String.Format("zoom={0}", int.Parse(collection["zoomLevelTextBox"]));
            }

            // Set the JavaScript action
            pdfButton.Action = new PdfActionJavaScript(javaScript);

            // Save the PDF document in a memory buffer
            byte[] outPdfBuffer = pdfDocument.Save();

            // Send the PDF file to browser
            FileResult fileResult = new FileContentResult(outPdfBuffer, "application/pdf");
            fileResult.FileDownloadName = "Button_JavaScript_Actions.pdf";

            return fileResult;
        }
    }
}