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Printing images as bakgrounds from HTML View in PDF


I'm struggling very hard to be able to print a simple certificate template, my current problems are:

  1. I need to set two images for background, front page and backpage. Currently I set them up using some css positioning through tags.

  2. When I set all the layout, they are fine in the HTML view, however, once I try yo print from browser, or from a custom plugin (rotativa wkhtmlpdf), the layout get messed up and all formatting is gone.

Below is the code: PS. @img_frente and @img_verso are base64 strings for the images as backgrounds.

 @@font-face {
            font-family: fonteMaior;
            src: url("../../Content/fonts/DINNextLTPro-Condensed.otf")
        }
/*        @@font-face {
            font-family: fonteMenor;
            src: url("../../Content/fonts/")
        }*/
        html {
            margin: 0 0;
            padding: 0;
        }

        body {
            margin: 0 0;
            font-family: fonteMaior;
            font-size: 28px;
            color: #464646;
        }

        .line {
            height: 20px;
            border-bottom: 1px solid #D1D1D1 !important;
            position: center;
        }

        * {
            -webkit-print-color-adjust: exact !important;
            page-break-inside: avoid !important;
        }

        .container {
            position: relative;
            text-align: center;
        }

        .mainText {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
        }

        .qrcode {
            position: absolute;
            bottom: 72px;
            left: 100px;
            border: 1px solid #D1D1D1 !important;
        }

        .registro {
            position: absolute;
            bottom: 120px;
            left: 265px;
        }

        .instrutor {
            position: absolute;
            bottom: 120px;
            left: 812px;
            width: 300px;
        }
        .verso {
            position: relative;

        }
        .conteudos {
            position: absolute;
            bottom: 430px;
            left: 135px;
        }

        @@media screen, print {
            html, body, #xxl {
                margin: 0;
                padding: 0;
                border: 0;
                font-family:fonteMaior;
                font-size:28;
            }

            #printable {
                margin: 0;
                padding: 0;
                border: 0;
                font-size: 14px;
            }

            img{
                display:inline;
            }
                #printable ~ * {
                    display: none;
                    -webkit-print-color-adjust: exact !important;
                    page-break-inside: avoid !important;
                }
        }

View:

<!DOCTYPE html>
    <html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <script type="text/javascript" src="~/Scripts/js/library/jquery-1.11.0.min.js"></script>
        <script type="text/javascript" src="~/Scripts/js/library/bootstrap.min.js"></script>
        <script type="text/javascript" src="~/Scripts/js/library/jquery.appear.min.js"></script>
        <script type="text/javascript" src="~/Scripts/js/library/jquery.easing.min.js"></script>
        <link rel="stylesheet" type="text/css" media="all" href="~/Content/css/library/bootstrap.min.css">
        <link rel="stylesheet" type="text/css" media="all"href="~/Content/css/library/fontawesome.min.css">
        <link rel="stylesheet" type="text/css" media="all" href="~/Content/css/md-font.css">
        <link rel="stylesheet" type="text/css" media="all" href="~/Content/css/style.css">
        <script>
            window.load = function () {
                window.status = 'render-pdf';
            };
        </script>
        <style>
    
            CSS is above
        </style>
    
    </head>
    <body>
        <div id="frenteCert" class="frente container">
            <img src=@img_frente alt="imagem frente" />
            <div class="mainText text-justify" style="font-family:fonteMaior;">
                <span class="">
                    @ViewBag.nomeProfessor, confere a <b style="text-transform: uppercase;">@ViewBag.nomeAluno</b> o presente certificado, referente à sua participação no curso <b style="text-transform: uppercase;">@ViewBag.nomeCurso</b>,
                    concluído em @ViewBag.dataCertificado @*@ViewBag.dataConclusao*@ , com carga horária de @ViewBag.cargaHoraria horas.
                </span>
            </div>
            <div id="qrCode" class="qrcode">
                <img src="@ViewBag.QRCodeImage" alt="" style="height:150px;width:150px" />
            </div>
            <div id="dataEmissao" class="registro">
                <p style="font-size:24px; font-family:fonteMaior;">Curitiba, 21 de Maio de 2021.</p>
            </div>
            <div id="instrutor" class="instrutor">
                <div class="line"></div>
                <p class="text-center" style="text-align:center; font-size: 24px; font-family:fonteMaior;">INSTRUTOR</p>
            </div>
        </div>
        <div id="versoCert" class="verso container">
            <img src=@img_verso alt="imagem verso" />
            <div id="colunas" class="conteudos">
                @foreach (var item in ViewBag.conteudos)
                {
                    <p>@item.conteudo</p>
                }
            </div>
        </div>
    
    </body>
    </html>

Controller: This is only the part where I call the PDF generator, which is working but idk how to configure better.

var viewPdf = new PartialViewAsPdf
{
    ViewName = "_GeraCertificado",
    RotativaOptions = { PageOrientation = Rotativa.Core.Options.Orientation.Landscape,
                        PageSize = Rotativa.Core.Options.Size.A4 },
    FileName = "certificado.pdf",
    Model = tbl_aluno_curso
};

if (isPdf != null && isPdf == true)
{
    return viewPdf;
}

Here is a sample image of the current output in html

Output in PDF - front

Output in PDF- back

Front

Back


Solution

  • I've come to a solution, treating div structure as parent/child with a master container on each block of the certificate, then aligned them with relative/absolute positioning. Full code below:

    PS. I removed useless scripts and the viewbags at src in img tags and vars are just base64 strings. I hope this can help people out!

                       <!DOCTYPE html>
        <html xmlns="http://www.w3.org/1999/xhtml">
        <head>
            <script type="text/javascript" src="~/Scripts/js/library/jquery-1.11.0.min.js"></script>
            <script type="text/javascript" src="~/Scripts/js/library/bootstrap.min.js"></script>
            <script type="text/javascript" src="~/Scripts/js/library/jquery.appear.min.js"></script>
            <script type="text/javascript" src="~/Scripts/js/library/jquery.easing.min.js"></script>
            <link rel="stylesheet" type="text/css" media="all" href="~/Content/css/library/bootstrap.min.css">
            <link rel="stylesheet" type="text/css" media="all" href="~/Content/css/library/font-awesome.min.css">
            <link rel="stylesheet" type="text/css" media="all" href="~/Content/css/md-font.css">
            <link rel="stylesheet" type="text/css" media="all" href="~/Content/css/style.css">
    
            <style>
        
                @@font-face {
                    font-family: fonteMaior;
                    src: url("../../Content/fonts/DINNextLTPro-Condensed.otf")
                }
        
                * {
                    -webkit-print-color-adjust: exact !important;
                    page-break-inside: avoid !important;
                }
        
                html {
                    margin: 0 0;
                    padding: 0;
                }
        
                body {
                    margin: 0 0;
                    font-family: fonteMaior !important;
                    font-size: 28px;
                    color: #464646;
                    padding: 0;
                }
        
                .line {
                    height: 20px;
                    border-bottom: 1px solid #D1D1D1 !important;
                    position: center;
                }
        
                .container {
                    position: relative;
                    text-align: center;
                }
        
                .mainText {
                    position: absolute;
                    top: 50%;
                    left: 50%;
                    transform: translate(-50%, -50%);
                }
        
                .qrcode {
                    position: absolute;
                    bottom: 72px;
                    left: 95px;
                    border: 1px solid #D1D1D1 !important;
                }
        
                .registro {
                    position: absolute;
                    bottom: 120px;
                    left: 265px;
                }
        
                .instrutor {
                    position: absolute;
                    bottom: 120px;
                    left: 775px;
                    width: 300px;
                }
        
                #assinatura {
                    position: absolute;
                    z-index: 99;
                    bottom: 35px;
                    left: 65px;
                    max-width: 280px;
                    max-height: 110px;
                    width: auto !important;
                    height: auto !important;
                }
        
                .frente {
                    background-image: url( @img_frente ) !important;
                    background-repeat: no-repeat !important;
                    background-position: top !important;
                    background-size: contain !important;
                    display: block !important;
                    width: 1170px !important;
                    height: 825px !important;
                }
                .verso {
                    background-image: url( @img_verso ) !important;
                    background-repeat: no-repeat !important;
                    background-position: top !important;
                    background-size: contain !important;
                    display: block !important;
                    width: 1170px !important;
                    height: 825px !important;
                }
        
                .conteudos {
                    position: absolute;
                    bottom: 140px;
                    left: 135px;
                    display: inline-flex;
                    flex-flow: column wrap;
                    align-content: flex-start;
                    height: 530px;
        /*            border: 1px solid blue !important;*/
                }
                .listConteudos{
        
                }
                ul {
                    list-style-type: none;
                    display: contents;
                    float: left;
                    flex-flow: column wrap;
                    align-content: flex-start;
                }
        
                
                @@media screen, print {
                    html, body {
                        margin: 0;
                        padding: 0;
                        border: 0;
                        font-family: fonteMaior !important;
                        font-size:28px;
                    }
                    .certContainer{
        
                    }
                    #printable {
                        margin: 0;
                        padding: 0;
                        border: 0;
                        font-size: 14px;
                    }
        
                    img{
                        display:inline;
                    }
                        #printable ~ * {
                            display: none;
                            -webkit-print-color-adjust: exact !important;
                            page-break-inside: avoid !important;
                        }
                }
            </style>
        </head>
        <body>
            <div id="frenteCert" class="frente container">
                @*<img src=@img_frente alt="imagem frente" />*@
                <div class="mainText text-justify" style="font-family:fonteMaior;">
                    <span class="">
                        @ViewBag.nomeProfessor, confere a <b style="text-transform: uppercase;">@ViewBag.nomeAluno</b> o presente certificado, referente à sua participação no curso <b style="text-transform: uppercase;">@ViewBag.nomeCurso</b>,
                        concluído em @ViewBag.dataConclusao, com carga horária de @ViewBag.cargaHoraria horas.
                    </span>
                </div>
                <div id="qrCode" class="qrcode">
                    <img src="@ViewBag.QRCodeImage" alt="" style="height:150px;width:150px" />
                </div>
                <div id="dataEmissao" class="registro">
                    @if (ViewBag.cidade != null && ViewBag.estado != null)
                    {
                        <p style="font-size:24px; font-family:fonteMaior;">@ViewBag.cidade - @ViewBag.estado, @ViewBag.dataCertificado.</p>
                    }
                    else
                    {
                        <p style="font-size:24px; font-family:fonteMaior;">CIDADE - UF, @ViewBag.dataCertificado.</p>
                    }        </div>
                <div id="instrutor" class="instrutor">
                    @if (ViewBag.assinatura != null)
                    {
                        <img id="assinatura" [email protected] alt="" />
                    }
                    else
                    {
                        <img id="assinatura" src=@signature alt="" style="height:75px;width:280px" />
                    }
        
                    <div class="line"></div>
                    <p class="text-center" style="text-align:center; font-size: 24px; font-family:fonteMaior;">INSTRUTOR</p>
                </div>
            </div>
            <div id="versoCert" class="verso container" style="text-align:unset !important">
                @*<img src=@img_verso alt="imagem verso" />*@
                <div id="colunas" class="conteudos" style="width: 200px !important">
                    <ul class="listConteudos">
                        @foreach (var item in ViewBag.conteudos)
                        {
                            <li style="font-family:fonteMaior; font-size: 18px !important; margin-right: 15px !important;">@item.conteudo</li>
                        }
                    </ul>
                </div>
            </div>
        </body>
        </html>