How can I dynamically Add css property to div class using javascript when converting to pdf using rotativa?

Question

<div id="mainDiv" class="watermark" style="font-family: Calibri; padding: 10px; border: 1px solid lightgrey;">
        <script type="text/javascript">
            (function () {
                var watermarkImage = "url(../../Resources/Watermark/" + @Model.Watermark + ".png)";
                var x = document.getElementsByClassName("watermark");

                x.setAttribute('background-image', watermarkImage);
                x.setAttribute('background-repeat', 'repeat-y')
            })();
        </script>

I am using mvc + rotativa to convert cshtml to pdf. I have passed Image name from controller. But when pdf is generated watermark is not coming. I want to add css property to div class using javascript.

Answer 1

If you want to add CSS to a single block having unique id then Try Below Code:

<script type="text/javascript">
            (function () {
                var watermarkImage = "url(../../Resources/Watermark/" + @Model.Watermark + ".png)";
               document.getElementById("mainDiv").style.background-image = watermarkImage;
               document.getElementById("mainDiv").style.background-repeat = 'repeat-y';
             })();
</script>

Hope this will help you!

Answer 2

This may help you

 x.style.background-image= watermarkImage;
 x.style.background-repeat =  repeat-y;

For more information you can use this link https://www.w3schools.com/jsref/met_element_setattribute.asp

Answer 3

When using rotativa to generate pdf, "@" symbol depricated the rest of the code when it is used in <script> tag and <style> tag. So we cant set background-image url in variable or cannot pass from controller. I solved by following way

@if (Model.IsArchieved == true && !string.IsNullOrEmpty(Model.ArchivedVersion))
{
    <style type="text/css">
        .watermark {
            background-image: url(../../Resources/Watermark/Archived.png);
            background-repeat: repeat;
            background-size: 600px 300px;
        }
    </style>
}
@if (Model.IsPublished == false)
{
    <style type="text/css">
        .watermark {
            background-image: url(../../Resources/Watermark/Draft5.png);
            background-repeat: repeat;
            background-size: 500px 275px;
        }
    </style>
}