csy_dot_io csy_dot_io - 7 months ago 64
Javascript Question

Insert folding marks on every page (wkhtmltopdf)

I'm using wkhtmltopdf 0.12.2.1 to create invoices and so on.

I need to display folding marks on every page in a pdf. How can I repeat them with javascript on every page, if the content is larger than one?

That's my basic markup

<!DOCTYPE html>
<html>
<head>
<title>PDF Title</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body id="pdf-page">
<div class="marks">
<div class="mark mark-top mark-left"></div>
<div class="mark mark-top mark-right"></div>
<div class="mark mark-middle mark-left"></div>
<div class="mark mark-bottom mark-left"></div>
<div class="mark mark-bottom mark-right"></div>
</div>
<div id="print-area">
<div id="letter-head"></div>
<div id="subject-line">Subject</div>
<div id="document-content">
....
....
....
</div>
</div>
</body>
</html>


It looks basically like that Image

Answer

Okay, this took me days to figuring this out.... because of the lack of examples on the internet (for PHP/HTML/Javascript). We got the following steps:

  1. get the DPI of your document
  2. set element to the real page size (out of sight)
  3. create wrapper/page element (your case .marks)
  4. determine if content of the page needs multiple pages to fit on

Note: I'm doing this without testing etc. and you need to play around of course.

...

<div class="marks">
    <div class="mark mark-top mark-left"></div>
    <div class="mark mark-top mark-right"></div>
    <div class="mark mark-middle mark-left"></div>
    <div class="mark mark-bottom mark-left"></div>
    <div class="mark mark-bottom mark-right"></div>
</div>

...

<script>
    // some static stuff found it somewhere on the internet
    var PDF = {
        width: 8.27, // inches, 210mm
        height: 11.65, // inches, 296mm
        margins: {
            top: 1.97, left: 0.34,
            right: 0.393700787, bottom: 0.393700787
        }
    };

    $(document).ready(function() {
        // get page sizes by creating 'shadow' element
        var pageSize = $('<div></div>')
            .css({
                height: PDF.height +'in', width: PDF.width +'in',
                top: '-100%', left: '-100%',
                position: 'absolute',
            })
            .appendTo('body');

        // set debug element
        $('.debug').html(pageSize.height());

        // set every page elements .marks to proper height
        // dont forget the substract the header and footer height
        $('.marks').height(pageSize.height() - footerHeight - headerHeight);

        // @TODO: duplicate .marks to times a pages is created, and !!maybe!! set the top of .marks with pageSize.height()
    });
</script>

I found my inspiration for the code here.

This worked out for me because I had fixed height elements and needed to repeat it on the page (in my .wrapper elm same as your .marks and they were 'relative' elements). In this way I could determine when to 'open' an new page by closing .marks in your case.

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