Adding HTML to PDF Elements to a PDF Document

EVO HTML to PDF Converter allows you to convert a HTML page to PDF by adding a HtmlToPdfElement object at a given location in a PDF document. You can add multiple HTML to PDF Elements in the same PDF document.

A HtmlToPdfElement allows you to set most of the HTML to PDF conversion options available when converting HTML to PDF using the HtmlToPdfConverter class.

protected void convertToPdfButton_Click(object sender, EventArgs e)
{
    // Create a PDF document
    Document pdfDocument = new Document();

    // Create a PDF page where to add the first HTML
    PdfPage firstPdfPage = pdfDocument.AddPage();

    try
    {
        // The element location in PDF
        float xLocation = float.Parse(xLocationTextBox.Text);
        float yLocation = float.Parse(yLocationTextBox.Text);

        // The URL of the HTML page to convert to PDF
        string urlToConvert = urlTextBox.Text;

        // Create the HTML to PDF element
        HtmlToPdfElement htmlToPdfElement = new HtmlToPdfElement(xLocation, yLocation, urlToConvert);

        // Optionally set the HTML viewer width
        htmlToPdfElement.HtmlViewerWidth = int.Parse(htmlViewerWidthTextBox.Text);

        // Optionally set the HTML viewer height
        if (htmlViewerHeightTextBox.Text.Length > 0)
            htmlToPdfElement.HtmlViewerHeight = int.Parse(htmlViewerHeightTextBox.Text);

        // Optionally set the HTML content clipping option to force the HTML content width to be exactly HtmlViewerWidth pixels
        htmlToPdfElement.ClipHtmlView = clipContentCheckBox.Checked;

        // Optionally set the destination width in PDF
        if (contentWidthTextBox.Text.Length > 0)
            htmlToPdfElement.Width = float.Parse(contentWidthTextBox.Text);

        // Optionally set the destination height in PDF
        if (contentHeightTextBox.Text.Length > 0)
            htmlToPdfElement.Height = float.Parse(contentHeightTextBox.Text);

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

        // Add the HTML to PDF element to PDF document
        // The AddElementResult contains the bounds of the HTML to PDF Element in last rendered PDF page
        // such that you can start a new PDF element right under it
        AddElementResult result = firstPdfPage.AddElement(htmlToPdfElement);

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

        // Send the PDF as response to browser

        // Set response content type
        Response.AddHeader("Content-Type", "application/pdf");

        // Instruct the browser to open the PDF file as an attachment or inline
        Response.AddHeader("Content-Disposition", String.Format("attachment; filename=Add_HTML_to_PDF_Elements_to_PDF.pdf; size={0}", outPdfBuffer.Length.ToString()));

        // Write the PDF document buffer to HTTP response
        Response.BinaryWrite(outPdfBuffer);

        // End the HTTP response and stop the current page processing
        Response.End();
    }
    finally
    {
        // Close the PDF document
        pdfDocument.Close();
    }
}

A live demo for adding HTML to PDF Elements to a PDF document with complete C# code can be found on product website.

 

 

Set Background and Foreground of PDF Pages Resulted from HTML to PDF Conversion

EVO HTML to PDF Converter allows you add elements in PDF pages background in HtmlToPdfConverter.BeforeRenderPdfPageEvent event handler which is called right before the main content of the PDF page is rendered by converter. You can find a C# sample code for this below:

protected void convertToPdfButton_Click(object sender, EventArgs e)
{
    // Create a HTML to PDF converter object with default settings
    HtmlToPdfConverter htmlToPdfConverter = new HtmlToPdfConverter();

    // 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 a handler for BeforeRenderPdfPageEvent where to set the background image in each PDF page before main content is rendered
    htmlToPdfConverter.BeforeRenderPdfPageEvent += new BeforeRenderPdfPageDelegate(htmlToPdfConverter_BeforeRenderPdfPageEvent);

    try
    {
        // The buffer to receive the generated PDF document
        byte[] outPdfBuffer = null;

        if (convertUrlRadioButton.Checked)
        {
            string url = urlTextBox.Text;

            // Convert the HTML page given by an URL to a PDF document in a memory buffer
            outPdfBuffer = htmlToPdfConverter.ConvertUrl(url);
        }
        else
        {
            string htmlString = htmlStringTextBox.Text;
            string baseUrl = baseUrlTextBox.Text;

            // Convert a HTML string with a base URL to a PDF document in a memory buffer
            outPdfBuffer = htmlToPdfConverter.ConvertHtml(htmlString, baseUrl);
        }

        // Send the PDF as response to browser

        // Set response content type
        Response.AddHeader("Content-Type", "application/pdf");

        // Instruct the browser to open the PDF file as an attachment or inline
        Response.AddHeader("Content-Disposition", String.Format("attachment; filename=Add_Elements_in_Background.pdf; size={0}", outPdfBuffer.Length.ToString()));

        // Write the PDF document buffer to HTTP response
        Response.BinaryWrite(outPdfBuffer);

        // End the HTTP response and stop the current page processing
        Response.End();
    }
    finally
    {
        // Uninstall the handler
        htmlToPdfConverter.BeforeRenderPdfPageEvent -= new BeforeRenderPdfPageDelegate(htmlToPdfConverter_BeforeRenderPdfPageEvent);
    }
}

/// <summary>
/// The BeforeRenderPdfPageEvent event handler where a background image is set in each PDF page
/// before the main content is rendered
/// </summary>
/// <param name="eventParams">The event parameter containing the PDF page being rendered</param>
void htmlToPdfConverter_BeforeRenderPdfPageEvent(BeforeRenderPdfPageParams eventParams)
{
    if (!addBackgroundImageCheckBox.Checked)
        return;

    // Get the PDF page being rendered
    PdfPage pdfPage = eventParams.Page;

    // Get the PDF page drawable area width and height
    float pdfPageWidth = pdfPage.ClientRectangle.Width;
    float pdfPageHeight = pdfPage.ClientRectangle.Height;

    // The image to be added as background
    string backgroundImagePath = Server.MapPath("~/DemoAppFiles/Input/Images/background.jpg");

    // The image element to add in background
    ImageElement backgroundImageElement = new ImageElement(0, 0, pdfPageWidth, pdfPageHeight, backgroundImagePath);
    backgroundImageElement.KeepAspectRatio = true;
    backgroundImageElement.EnlargeEnabled = true;

    // Add the background image element to PDF page before the main content is rendered
    pdfPage.AddElement(backgroundImageElement);
}

You can see a live demo for adding elements in PDF pages background in demo website.

EVO HTML to PDF Converter also allows you add elements over the PDF pages main content in HtmlToPdfConverter.AfterRenderPdfPageEvent event handler which is called right after the main content of the PDF page was rendered by converter. The C# sample code for this features is below:

protected void convertToPdfButton_Click(object sender, EventArgs e)
{
    // Create a HTML to PDF converter object with default settings
    HtmlToPdfConverter htmlToPdfConverter = new HtmlToPdfConverter();

    // 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 a handler for AfterRenderPdfPageEvent where to add the stamp in each PDF page over the main content
    htmlToPdfConverter.AfterRenderPdfPageEvent += new AfterRenderPdfPageDelegate(htmlToPdfConverter_AfterRenderPdfPageEvent);

    try
    {
        // The buffer to receive the generated PDF document
        byte[] outPdfBuffer = null;

        if (convertUrlRadioButton.Checked)
        {
            string url = urlTextBox.Text;

            // Convert the HTML page given by an URL to a PDF document in a memory buffer
            outPdfBuffer = htmlToPdfConverter.ConvertUrl(url);
        }
        else
        {
            string htmlString = htmlStringTextBox.Text;
            string baseUrl = baseUrlTextBox.Text;

            // Convert a HTML string with a base URL to a PDF document in a memory buffer
            outPdfBuffer = htmlToPdfConverter.ConvertHtml(htmlString, baseUrl);
        }

        // Send the PDF as response to browser

        // Set response content type
        Response.AddHeader("Content-Type", "application/pdf");

        // Instruct the browser to open the PDF file as an attachment or inline
        Response.AddHeader("Content-Disposition", String.Format("attachment; filename=Add_Elements_Over_Main_Content.pdf; size={0}", outPdfBuffer.Length.ToString()));

        // Write the PDF document buffer to HTTP response
        Response.BinaryWrite(outPdfBuffer);

        // End the HTTP response and stop the current page processing
        Response.End();
    }
    finally
    {
        // Uninstall the handler
        htmlToPdfConverter.AfterRenderPdfPageEvent -= new AfterRenderPdfPageDelegate(htmlToPdfConverter_AfterRenderPdfPageEvent);
    }
}

void htmlToPdfConverter_AfterRenderPdfPageEvent(AfterRenderPdfPageParams eventParams)
{
    if (!addStampCheckBox.Checked)
        return;

    // Get the rendered PDF page
    PdfPage pdfPage = eventParams.Page;

    int pageNumber = eventParams.PageNumber;
    int pageCount = eventParams.PageCount;
    bool isOddPage = pageNumber % 2 != 0;

    // Get the PDF document
    Document pdfDocument = pdfPage.Document;

    // Get the PDF page drawable area width and height
    float pdfPageWidth = pdfPage.ClientRectangle.Width;
    float pdfPageHeight = pdfPage.ClientRectangle.Height;

    // Create a .NET font
    Font timesNewRomanFont = new Font("Times New Roman", 50, GraphicsUnit.Point);

    // Create a PDF font
    PdfFont pdfFont = pdfDocument.AddFont(timesNewRomanFont, true);

    // The stamp text
    string text = String.Format("Stamp on Page {0} of {1}", pageNumber, pageCount);

    // Measure the text 
    float textWidth = pdfFont.GetTextWidth(text);

    // Calculate the PDF page diagonal
    float pdfPageDiagonal = (float)Math.Sqrt(pdfPageWidth * pdfPageWidth + pdfPageHeight * pdfPageHeight);

    // The text location on PDF page diagonal
    float xLocation = (pdfPageDiagonal - textWidth) / 2;

    // Create the stamp as a rotated text element
    TextElement stampTextElement = new TextElement(xLocation, 0, text, pdfFont);
    stampTextElement.ForeColor = isOddPage ? Color.Blue : Color.Green;
    stampTextElement.Rotate((float)(Math.Atan(pdfPageHeight / pdfPageWidth) * (180 / Math.PI)));
    stampTextElement.Opacity = 75;

    // Add the stamp to PDF page
    pdfPage.AddElement(stampTextElement);
}

The live demo adding elements over PDF page main content can also be accessed in demo website.

 

Convert HTML Forms to Fillable PDF Forms using HTML to PDF Converter for .NET

EVO HTML to PDF Converter for .NET can be configured to convert HTML form elements like radio buttons, check boxes, text boxes and buttons to PDF form fields by simply turning on the PdfFormOptions. AutoPdfFormEnabled option.

You can also select in HTML the fields you want to be converted to PDF form fields using the data-pdf-form-field special attribute. The other HTML fields which were not explicitly selected will not be converted to PDF form fields.

C# Code Sample to Convert HTML Forms to PDF Forms

protected void convertToPdfButton_Click(object sender, EventArgs e)
{
    // Create a HTML to PDF converter object with default settings
    HtmlToPdfConverter htmlToPdfConverter = new HtmlToPdfConverter();

    // 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;

    // Enable the automatic conversion of the HTML form to a PDF form 
    htmlToPdfConverter.PdfFormOptions.AutoPdfFormEnabled = createPdfFormCheckBox.Checked;

    // Set the submit buttons style
    htmlToPdfConverter.PdfFormOptions.SubmitButtonStyle.BackColor = Color.Beige;

    // Set the style of various types of text boxes
    htmlToPdfConverter.PdfFormOptions.TextBoxStyle.BackColor = Color.AliceBlue;
    htmlToPdfConverter.PdfFormOptions.PasswordTextBoxStyle.BackColor = Color.MistyRose;
    htmlToPdfConverter.PdfFormOptions.MultilineTextBoxStyle.BackColor = Color.AliceBlue;

    // Set the radio buttons style
    htmlToPdfConverter.PdfFormOptions.RadioButtonsGroupStyle.BackColor = Color.AntiqueWhite;

    // Set the checkboxes styles
    htmlToPdfConverter.PdfFormOptions.CheckBoxStyle.BackColor = Color.AntiqueWhite;

    // set the drop down lists style
    htmlToPdfConverter.PdfFormOptions.ComboBoxStyle.BackColor = Color.LightCyan;

    byte[] outPdfBuffer = null;

    if (convertHtmlRadioButton.Checked)
    {
        // Convert a HTML string to a PDF document with form fields
        string htmlWithForm = htmlStringTextBox.Text;
        outPdfBuffer = htmlToPdfConverter.ConvertHtml(htmlWithForm, String.Empty);
    }
    else
    {
        // Convert the HTML page to a PDF document with form fields
        string url = urlTextBox.Text;
        outPdfBuffer = htmlToPdfConverter.ConvertUrl(url);
    }

    // Send the PDF as response to browser

    // Set response content type
    Response.AddHeader("Content-Type", "application/pdf");

    // Instruct the browser to open the PDF file as an attachment or inline
    Response.AddHeader("Content-Disposition", String.Format("attachment; filename=Auto_Create_PDF_Forms.pdf; size={0}", outPdfBuffer.Length.ToString()));

    // Write the PDF document buffer to HTTP response
    Response.BinaryWrite(outPdfBuffer);

    // End the HTTP response and stop the current page processing
    Response.End();
}

You can also see a demo for converting HTML Forms to Live PDF Forms with complete C# source code.