Execute Acrobat JavaScript Code when Document is Opened

EVO PDF Client for .NET Core

EVO HTML to PDF Converter allows you to add an Acrobat JavaScript code in generated PDF to be executed when the PDF document is opened in a PDF viewer. You can set open actions in the generated PDF document to display an alert message, automatically open the print dialog or set the zoom level of the generated PDF document.

An Acrobat JavaScript action is represented by a PdfActionJavaScript object which can be assigned to DocumentOpenAction property.

Code Sample - Execute Acrobat JavaScript Code when Document is Opened

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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_Open_ActionController : 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();

            // Create a HTML to PDF element to add to document
            HtmlToPdfElement htmlToPdfElement = new HtmlToPdfElement(collection["urlTextBox"]);

            // Optionally set a delay before conversion to allow asynchonous scripts to finish
            htmlToPdfElement.ConversionDelay = 2;

            // Add the HTML to PDF element to document
            pdfPage.AddElement(htmlToPdfElement);

            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
            pdfDocument.OpenAction = 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 = "Execute_Acrobat_JavaScript.pdf";

            return fileResult;
        }
    }
}