Alternative to "class=chapter" to force a page break

porphyry5 · 01-25-2022, 05:10 PM

I produce epubs from a single (deprecated) html source file with calibre. The only way I know to produce a forced page break in my kobo and onyx ereaders is by adding the phrase " class=chapter" to specific html tags, for example:

Code:

<html><body>
<p class=chapter><img width=100% src=i/1000.jpg></p> 
<p class=chapter><img width=100% src=i/1001.jpg></p> 
<a name="c/1004.tiff"></a> 
<h3 class=chapter>Foreword</h3>

This does the job very well, except the two <img...> lines appear in the Table of Contents as 'Unknown' chapters, which I would prefer to do without. Does calibre have an alternative to "class=chapter" that will cause it to generate page break without affecting the TOC?

Karellen · 01-25-2022, 05:32 PM

Split your single html source into separate html pages. Each html page forces a new page/chapter.

theducks · 01-25-2022, 09:06 PM

Class=chapter is a crude way to do it. Actually the word Chapter is a keyword

What that was included in conversion for was for older text files that had no HTML.

Just break the files 'per chapter'

or use the CSS page-break-before: always; attached to the first block where you want a split

kovidgoyal · 01-25-2022, 09:45 PM

Or use the option in the structure detection section of the conversion dialog (which is also where class="chapter" comes from btw)

porphyry5 · 01-27-2022, 05:15 PM

Quote:

Originally Posted by Karellen

Split your single html source into separate html pages. Each html page forces a new page/chapter.

Thank you for the suggestion, but I would prefer to avoid generating multiple sources if possible. I produce epubs by the use of a series of bash and vim scripts from original screenshot images. Writing code is much simplified if I only ever have to consider one input file with a constant name, which is how I have it arranged.

porphyry5 · 01-27-2022, 05:41 PM

Quote:

Originally Posted by theducks

Class=chapter is a crude way to do it. Actually the word Chapter is a keyword

Au contraire, it is an extremely refined way of doing it, because it may be applied, or not as one chooses, to so many instances where the keyword 'chapter' is unavailable, e.g. Foreword, Preface, Author's Note, Glossary, Epilog etc, even to books that indicate chapters by such formatting "subtleties" as capitalizing the first line or first few words of each chapter; all this merely by coding a regex that fits the peculiarities of the text involved to control a script that codes the chapter heading for each such found in the text. Really the only limit to it is one's imagination.

Quote:

or use the CSS page-break-before: always; attached to the first block where you want a split

I've tried that via the html 'style' tag, but it does not produce the desired effect. I've never learned CSS because my interest in page formatting is minimal, I find calibre's vanilla option completely satisfactory in that respect.

But thank you for your help.

porphyry5 · 01-27-2022, 06:10 PM

Quote:

Originally Posted by kovidgoyal

Or use the option in the structure detection section of the conversion dialog (which is also where class="chapter" comes from btw)

Perfect.

Quote:

The default setting for detecting page breaks is:

//*[name()='h1' or name()='h2']

which means that calibre will insert page breaks before every <h1> and
<h2> tag by default.

Meant all I needed to do was

Code:

<h2><img width=100% src=i/1000.jpg></h2> 
<h2><img width=100% src=i/1001.jpg></h2>

And thank you for your courtesy, eschewing the use of RTFM, which I certainly should have done.

01-25-2022, 05:10 PM	#1
porphyry5 Connoisseur Posts: 69 Karma: 10 Join Date: Apr 2013 Device: Kobo Clara, Onyx Boox Monte Cristo	Alternative to "class=chapter" to force a page break I produce epubs from a single (deprecated) html source file with calibre. The only way I know to produce a forced page break in my kobo and onyx ereaders is by adding the phrase " class=chapter" to specific html tags, for example: Code: <html><body> <p class=chapter><img width=100% src=i/1000.jpg></p> <p class=chapter><img width=100% src=i/1001.jpg></p> <a name="c/1004.tiff"></a> <h3 class=chapter>Foreword</h3> This does the job very well, except the two <img...> lines appear in the Table of Contents as 'Unknown' chapters, which I would prefer to do without. Does calibre have an alternative to "class=chapter" that will cause it to generate page break without affecting the TOC?

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01-25-2022, 05:32 PM	#2
Karellen Wizard Posts: 1,351 Karma: 6794938 Join Date: Sep 2021 Location: Australia Device: Kobo Libra 2	Split your single html source into separate html pages. Each html page forces a new page/chapter.

01-25-2022, 09:06 PM	#3
theducks Well trained by Cats Posts: 30,440 Karma: 58055868 Join Date: Aug 2009 Location: The Central Coast of California Device: Kobo Libra2,Kobo Aura2v1, K4NT(Fixed: New Bat.), Galaxy Tab A	Class=chapter is a crude way to do it. Actually the word Chapter is a keyword What that was included in conversion for was for older text files that had no HTML. Just break the files 'per chapter' or use the CSS page-break-before: always; attached to the first block where you want a split

01-25-2022, 09:45 PM	#4
kovidgoyal creator of calibre Posts: 44,482 Karma: 24495778 Join Date: Oct 2006 Location: Mumbai, India Device: Various	Or use the option in the structure detection section of the conversion dialog (which is also where class="chapter" comes from btw)