Define Custom Internal Links in HTML

EVO PDF Client for .NET Core

EVO HTML to PDF Converter allows you to transform any HTML element to an internal link to another HTML element in generated PDF document by using the data-internal-link-enabled and data-link-target-id on the link source HTML element and the data-target-id attribute on link target HTML element. With data-internal-link-enabled attribute you can also disable the automatic conversion of an internal link in HTML to an internal link in PDF when you set this attribute to false.

Code Sample - Define Custom Internal Links in HTML

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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.HTML_to_PDF.Internal_Links
{
    public class Define_Custom_Internal_LinksController : Controller
    {
        [HttpPost]
        public ActionResult ConvertHtmlToPdf(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 the HTML to PDF converter object
            HtmlToPdfConverter htmlToPdfConverter = null;
            if (useTcpService)
                htmlToPdfConverter = new HtmlToPdfConverter(serverIP, serverPort);
            else
                htmlToPdfConverter = new HtmlToPdfConverter(true, webServiceUrl);

            // Set optional service password
            if (useServicePassword)
                htmlToPdfConverter.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
            htmlToPdfConverter.LicenseKey = "4W9+bn19bn5ue2B+bn1/YH98YHd3d3c=";

            // Set an adddional delay in seconds to wait for JavaScript or AJAX calls after page load completed
            // Set this property to 0 if you don't need to wait for such asynchcronous operations to finish
            htmlToPdfConverter.ConversionDelay = 2;

            byte[] outPdfBuffer = null;

            if (collection["HtmlPageSource"] == "convertHtmlRadioButton")
            {
                string htmlWithInternalLinksAttributes = collection["htmlStringTextBox"];
                string baseUrl = collection["baseUrlTextBox"];

                // Convert a HTML string with internal links to a PDF document in a memory buffer
                outPdfBuffer = htmlToPdfConverter.ConvertHtml(htmlWithInternalLinksAttributes, baseUrl);
            }
            else
            {
                string url = collection["urlTextBox"];

                // Convert a HTML page with internal links to a PDF document in a memory buffer
                outPdfBuffer = htmlToPdfConverter.ConvertUrl(url);
            }

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

            return fileResult;
        }
    }
}

HTML Code with Custom Internal Link Attributes

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<!DOCTYPE html>
<html>
<head>
    <title>Define Custom URI Links in HTML</title>
</head>
<body style="font-family: 'Times New Roman'; font-size: 14px">
    <table data-internal-link-enabled="true" data-link-target-id="internalLinkTargetID" style="border: 1px solid green; width: 650px">
        <tr>
            <td style="font-weight: bold; color: navy" colspan="2">This HTML Table is Converted to an Internal Link in PDF Using 'Data-Internal-Link-Enabled' Attribute
            </td>
        </tr>
        <tr>
            <td style="width: 350px">
                <img alt="Logo Image" style="width: 350px" src="img/logo.jpg" />
            </td>
            <td style="font-size: 40px; font-weight: normal; color: navy; text-align: center">>>>
            </td>
        </tr>
    </table>
    <br />
    <br />
    <span style="font-weight: bold; color: black">The Internal Link Below was Explicitly Disabled Using 'Data-Internal-Link-Enabled' Attribute:</span><br />
    <br />
    <a data-link-enabled="false" href="#disableLinkTargetID" style="font-size: 18px; font-weight: bold; color: gray">This Internal Internal Link is Disabled in PDF</a>
    <br />
    <br />
    <span data-target-id="internalLinkTargetID" style="page-break-before: always; font-size: 14px; font-weight: bold; color: green">This HTML element is the target of the custom internal link defined in HTML by Data-Internal-Link-Enabled="true" attribute.<br />
        The element has a 'Data-Target-Id' attribute with value 'internalLinkTargetID' matching the value of the 'Data-Link-Target-Id'<br />
        attribute of the internal link.
    </span>
    <br />
    <br />
    <span id="disableLinkTargetID" style="page-break-before: always; font-size: 14px; font-weight: bold; color: gray">This HTML element is the target of the internal link disabled by Data-Internal-Link-Enabled="false" attribute.
    </span>
</body>
</html>