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948077 Added signature field in the PDF converted from HTML #151

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3d8838e
948077 Added signature field in the PDF converted from HTML
sameerkhan001 Mar 25, 2025
d6a1bed
948077 Resolved given feedback.
sameerkhan001 Apr 22, 2025
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22 changes: 22 additions & 0 deletions ...eld-to-PDF-converted-from-HTML/.NET/Adding-signature-field-to-PDF-converted-from-HTML.sln
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Microsoft Visual Studio Solution File, Format Version 12.00
# Visual Studio Version 17
VisualStudioVersion = 17.12.35707.178 d17.12
MinimumVisualStudioVersion = 10.0.40219.1
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Adding-signature-field-to-PDF-converted-from-HTML", "Adding-signature-field-to-PDF-converted-from-HTML\Adding-signature-field-to-PDF-converted-from-HTML.csproj", "{5A85F0E8-3D3C-4F45-8184-FB3B76BBC9BD}"
EndProject
Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution
Debug|Any CPU = Debug|Any CPU
Release|Any CPU = Release|Any CPU
EndGlobalSection
GlobalSection(ProjectConfigurationPlatforms) = postSolution
{5A85F0E8-3D3C-4F45-8184-FB3B76BBC9BD}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
{5A85F0E8-3D3C-4F45-8184-FB3B76BBC9BD}.Debug|Any CPU.Build.0 = Debug|Any CPU
{5A85F0E8-3D3C-4F45-8184-FB3B76BBC9BD}.Release|Any CPU.ActiveCfg = Release|Any CPU
{5A85F0E8-3D3C-4F45-8184-FB3B76BBC9BD}.Release|Any CPU.Build.0 = Release|Any CPU
EndGlobalSection
GlobalSection(SolutionProperties) = preSolution
HideSolutionNode = FALSE
EndGlobalSection
EndGlobal
15 changes: 15 additions & 0 deletions ...field-to-PDF-converted-from-HTML/Adding-signature-field-to-PDF-converted-from-HTML.csproj
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<Project Sdk="Microsoft.NET.Sdk">

<PropertyGroup>
<OutputType>Exe</OutputType>
<TargetFramework>net8.0</TargetFramework>
<RootNamespace>Adding_signature_field_to_PDF_converted_from_HTML</RootNamespace>
<ImplicitUsings>enable</ImplicitUsings>
<Nullable>enable</Nullable>
</PropertyGroup>

<ItemGroup>
<PackageReference Include="Syncfusion.HtmlToPdfConverter.Net.Windows" Version="*" />
</ItemGroup>

</Project>
22 changes: 22 additions & 0 deletions ...converted-from-HTML/.NET/Adding-signature-field-to-PDF-converted-from-HTML/Data/Test.html
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<!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta charset="utf-8" />
<title>Form Template - Signature</title>
</head>
<body>
<form method="POST">
<h3>Sample Form Data</h3>
<table style="border: solid 1px red; margin: 5px" cellpadding="5px">
<tr>
<td>Signature:</td>
<td>
<textarea id="signature" name="signature" placeholder="Sign here..."
style="background-color:LightCyan;border:1px solid Gray;height:50px;width:200px;">
</textarea>
</td>
</tr>
</table>
</form>
</body>
</html>
Empty file added ...onverted-from-HTML/.NET/Adding-signature-field-to-PDF-converted-from-HTML/Output/.gitkeep
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79 changes: 79 additions & 0 deletions ...PDF-converted-from-HTML/.NET/Adding-signature-field-to-PDF-converted-from-HTML/Program.cs
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using Syncfusion.Drawing;
using Syncfusion.HtmlConverter;
using Syncfusion.Pdf;
using Syncfusion.Pdf.Parsing;
using Syncfusion.Pdf.Interactive;

internal class Program
{
static void Main(string[] args)
{
// Initialize the HTML to PDF converter using the Blink rendering engine
HtmlToPdfConverter htmlConverter = new HtmlToPdfConverter();

// Configure the converter to preserve form fields in the PDF
BlinkConverterSettings settings = new BlinkConverterSettings
{
EnableForm = true // Ensures form elements like <input>, <textarea> are converted to PDF fields
};
htmlConverter.ConverterSettings = settings;

// Convert the HTML file to a PDF document
PdfDocument document = htmlConverter.Convert(Path.GetFullPath(@"Data/Test.html"));

// Optional: Remove default appearances for form fields to match the page style
document.Form.SetDefaultAppearance(false);

// Save the PDF to a memory stream for further processing
using (MemoryStream stream = new MemoryStream())
{
document.Save(stream); // Save converted PDF to memory
stream.Position = 0; // Reset stream position
document.Close(true); // Close the original document

// Replace the "signature" textarea with an actual signature field
AddPdfSignatureField(stream);
}
}

/// <summary>
/// Finds the "signature" field in the form, removes it, and replaces it with a true PDF signature field.
/// </summary>
/// <param name="stream">MemoryStream containing the PDF document</param>
static void AddPdfSignatureField(MemoryStream stream)
{
// Load the PDF document from memory stream
using (PdfLoadedDocument loadedDocument = new PdfLoadedDocument(stream))
{
PdfLoadedForm loadedForm = loadedDocument.Form;

// Check for a field named "signature"
if (loadedForm.Fields["signature"] is PdfLoadedTextBoxField signatureTextBox)
{
// Get the original field's position and page
RectangleF bounds = signatureTextBox.Bounds;
PdfPageBase page = signatureTextBox.Page;

// Remove the original textbox field
loadedForm.Fields.Remove(signatureTextBox);

// Create a new signature field at the same location
PdfSignatureField signatureField = new PdfSignatureField(page, "ClientSignature")
{
Bounds = bounds
};

// Add the new signature field to the form
loadedForm.Fields.Add(signatureField);
}

// Save the modified document to disk
using (FileStream outputStream = new FileStream(Path.GetFullPath(@"Output/Output.pdf"), FileMode.Create, FileAccess.Write))
{
loadedDocument.Save(outputStream);
}
// Close the document and release resources
loadedDocument.Close(true);
}
}
}
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