EVO HTML to PDF Converter

Merge Multiple HTML Pages into a Single PDF

EVO HTML to PDF Converter for .NET Documentation

EVO HTML to PDF Converter offers a great flexibility in adding headers and footers to the generated PDF document. You can even have headers and footers when you to add multiple HTML documents into a single PDF document.

Code Sample - Merge Multiple HTML Pages into a Single PDF
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protected void convertToPdfButton_Click(object sender, EventArgs e)
{
    // Create a PDF document
    Document pdfDocument = new Document();

    // 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 firstPdfPage = pdfDocument.AddPage();

    // Create Header
    if (addHeaderCheckBox.Checked)
        CreateHeader(pdfDocument, drawHeaderLineCheckBox.Checked);

    // Create Footer
    if (addFooterCheckBox.Checked)
        CreateFooter(pdfDocument, drawFooterLineCheckBox.Checked, addPageNumbersInFooterCheckBox.Checked);

    try
    {
        // Add First HTML

        // Create the first HTML to PDF element
        HtmlToPdfElement firstHtml = new HtmlToPdfElement(0, 0, firstUrlTextBox.Text);

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

        // Optionally add a space between header and the content generated by this HTML to PDF element
        // The spacing for first page and the subsequent pages can be set independently
        // Leave this option not set for no spacing
        firstHtml.Y = float.Parse(firstPageSpacingTextBox.Text);
        firstHtml.TopSpacing = float.Parse(headerSpacingTextBox.Text);

        // Optionally add a space between footer and the content generated by this HTML to PDF element
        // Leave this option not set for no spacing
        firstHtml.BottomSpacing = float.Parse(footerSpacingTextBox.Text);

        // Install a handler where to set header visibility in the pages where the HTML element is rendered
        firstHtml.PrepareRenderPdfPageEvent += new PrepareRenderPdfPageDelegate(htmlToPdfElement_PrepareRenderPdfPageEvent);

        // Add the first HTML to PDF element to PDF document
        // The PrepareRenderPdfPageEvent event handler will be invoked for each rendered PDF page
        AddElementResult firstAddResult = firstPdfPage.AddElement(firstHtml);

        // Uninstall the handler
        firstHtml.PrepareRenderPdfPageEvent -= new PrepareRenderPdfPageDelegate(htmlToPdfElement_PrepareRenderPdfPageEvent);

        // Add Second HTML

        PdfPage secondPdfPage = null;
        PointF secondHtmlLocation = Point.Empty;

        if (startNewPageCheckBox.Checked)
        {
            // Create a PDF page where to add the second HTML
            secondPdfPage = pdfDocument.AddPage();
            secondHtmlLocation = PointF.Empty;
        }
        else
        {
            // Add the second HTML on the PDF page where the first HTML ended
            secondPdfPage = pdfDocument.Pages[firstAddResult.EndPageIndex];
            secondHtmlLocation = new PointF(firstAddResult.EndPageBounds.Left, firstAddResult.EndPageBounds.Bottom);
        }

        // Create the second HTML to PDF element
        HtmlToPdfElement secondHtml = new HtmlToPdfElement(secondHtmlLocation.X, secondHtmlLocation.Y, secondUrlTextBox.Text);

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

        // Optionally add a space between header and the content generated by this HTML to PDF element
        // Leave this option not set for no spacing
        secondHtml.TopSpacing = float.Parse(headerSpacingTextBox.Text);

        // Optionally add a space between footer and the content generated by this HTML to PDF element
        // Leave this option not set for no spacing
        secondHtml.BottomSpacing = float.Parse(footerSpacingTextBox.Text);

        // Install a handler where to set header visibility in the pages where the HTML element is rendered
        secondHtml.PrepareRenderPdfPageEvent += new PrepareRenderPdfPageDelegate(htmlToPdfElement_PrepareRenderPdfPageEvent);

        // Add the second HTML to PDF element to PDF document
        // The PrepareRenderPdfPageEvent event handler will be invoked for each rendered PDF page
        secondPdfPage.AddElement(secondHtml);

        // Uninstall the handler
        secondHtml.PrepareRenderPdfPageEvent -= new PrepareRenderPdfPageDelegate(htmlToPdfElement_PrepareRenderPdfPageEvent);

        // 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=Header_Footer_in_Merge_Multipe_HTML.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();
    }
}

/// <summary>
/// Creates the document header
/// </summary>
/// <param name="pdfDocument">The PDF document object</param>
/// <param name="drawHeaderLine">A flag indicating if a line should be drawn at the bottom of the header</param>
private void CreateHeader(Document pdfDocument, bool drawHeaderLine)
{
    string headerHtmlUrl = Server.MapPath("~/DemoAppFiles/Input/HTML_Files/Header_HTML.html");

    // Add a header to document having 60 points in height
    pdfDocument.AddHeaderTemplate(60);

    // Create a HTML element to be added in header
    HtmlToPdfElement headerHtml = new HtmlToPdfElement(headerHtmlUrl);

    // Set the HTML element to fit the container height
    headerHtml.FitHeight = true;

    // Add HTML element to header
    pdfDocument.Header.AddElement(headerHtml);

    if (drawHeaderLine)
    {
        float headerWidth = pdfDocument.Header.Width;
        float headerHeight = pdfDocument.Header.Height;

        // Create a line element for the bottom of the header
        LineElement headerLine = new LineElement(0, headerHeight - 1, headerWidth, headerHeight - 1);

        // Set line color
        headerLine.ForeColor = Color.Gray;

        // Add line element to the bottom of the header
        pdfDocument.Header.AddElement(headerLine);
    }
}

/// <summary>
/// Creates the document footer
/// </summary>
/// <param name="htmlToPdfConverter">The HTML to PDF Converter object</param>
/// <param name="addPageNumbers">A flag indicating if the page numbering is present in footer</param>
/// <param name="drawFooterLine">A flag indicating if a line should be drawn at the top of the footer</param>
private void CreateFooter(Document pdfDocument, bool addPageNumbers, bool drawFooterLine)
{
    string footerHtmlUrl = Server.MapPath("~/DemoAppFiles/Input/HTML_Files/Footer_HTML.html");

    // Add a footer to document having 60 points in height
    pdfDocument.AddFooterTemplate(60);

    // Create a HTML element to be added in footer
    HtmlToPdfElement footerHtml = new HtmlToPdfElement(footerHtmlUrl);

    // Set the HTML element to fit the container height
    footerHtml.FitHeight = true;

    // Add HTML element to footer
    pdfDocument.Footer.AddElement(footerHtml);

    // Add page numbering
    if (addPageNumbers)
    {
        // Create a text element with page numbering place holders &p; and & P;
        TextElement footerText = new TextElement(0, 30, "Page &p; of &P;  ",
            new System.Drawing.Font(new System.Drawing.FontFamily("Times New Roman"), 10, System.Drawing.GraphicsUnit.Point));

        // Align the text at the right of the footer
        footerText.TextAlign = HorizontalTextAlign.Right;

        // Set page numbering text color
        footerText.ForeColor = Color.Navy;

        // Embed the text element font in PDF
        footerText.EmbedSysFont = true;

        // Add the text element to footer
        pdfDocument.Footer.AddElement(footerText);
    }

    if (drawFooterLine)
    {
        // Calculate the footer width based on PDF page size and margins
        float footerWidth = pdfDocument.Footer.Width;

        // Create a line element for the top of the footer
        LineElement footerLine = new LineElement(0, 0, footerWidth, 0);

        // Set line color
        footerLine.ForeColor = Color.Gray;

        // Add line element to the bottom of the footer
        pdfDocument.Footer.AddElement(footerLine);
    }
}

/// <summary>
/// The handler for HtmlToPdfElement.PrepareRenderPdfPageEvent event where you can set the visibility of header and footer
/// in each page or you can add a custom header or footer in a page
/// </summary>
/// <param name="eventParams">The event parameter containin the PDF page to customize before rendering</param>
void htmlToPdfElement_PrepareRenderPdfPageEvent(PrepareRenderPdfPageParams eventParams)
{
    // Set the header visibility in first, odd and even pages
    if (addHeaderCheckBox.Checked)
    {
        if (eventParams.PageNumber == 1)
            eventParams.Page.ShowHeader = showHeaderInFirstPageCheckBox.Checked;
        else if ((eventParams.PageNumber % 2) == 0 && !showHeaderInEvenPagesCheckBox.Checked)
            eventParams.Page.ShowHeader = false;
        else if ((eventParams.PageNumber % 2) == 1 && !showHeaderInOddPagesCheckBox.Checked)
            eventParams.Page.ShowHeader = false;
    }

    // Set the footer visibility in first, odd and even pages
    if (addFooterCheckBox.Checked)
    {
        if (eventParams.PageNumber == 1)
            eventParams.Page.ShowFooter = showFooterInFirstPageCheckBox.Checked;
        else if ((eventParams.PageNumber % 2) == 0 && !showFooterInEvenPagesCheckBox.Checked)
            eventParams.Page.ShowFooter = false;
        else if ((eventParams.PageNumber % 2) == 1 && !showFooterInOddPagesCheckBox.Checked)
            eventParams.Page.ShowFooter = false;
    }
}