Page numbers wrong in TOC

gingerbeardman · 12-07-2021, 11:37 AM

The attached .epub is automatically generated using pandoc.
https://github.com/greyscalepress/manifestos

On my Mac it is fine, using Calibre viewer, with the TOC items jumping to the correct chapter and page.

However, on my Sony Reader the page numbers listed next to items in the TOC are those for the following chapter. Tapping on an item in the TOC jumps me to the page number display, but that's the following chapter. Otherwise the epub opens and reads just fine.

I suspect there is a problem with the epub that is causing my Sony Reader to misbehave.

Any ideas why this might be? Thoughts appreciated.

Thanks!

jackie_w · 12-07-2021, 12:56 PM

Quote:

Originally Posted by gingerbeardman

I suspect there is a problem with the epub that is causing my Sony Reader to misbehave.

Any ideas why this might be? Thoughts appreciated.

Your attached epub is an epub3.

Just a guess but I would think your Sony is far too old to support epub3.

gingerbeardman · 12-07-2021, 01:07 PM

The epub opens and reads just fine on my Sony.

It's just the TOC links that are wrong.

Is this symptomatic of lack of support for epub 3 in your experience?

DNSB · 12-07-2021, 01:28 PM

Are you using the links in the nav.xhtml file as an in-line ToC or are you using the toc.ncx (unneeded by epub3 but often included for epub2 compatibility)?

gingerbeardman · 12-07-2021, 02:21 PM

The photo above is the Reader's own user interface TOC display. I'm not sure which it represents.

But the inline links on the TOC nav page (page 2, iirc) also exhibit the same behaviour.

I'll generate an epub2 later on and see if that makes a difference.

hobnail · 12-07-2021, 04:28 PM

I'd be curious to see how it works if you take your epub that you got from pandoc and open it in sigil and in sigil go to the Tools menu and go down to Epub3 Tools and select Generate NCX/Guide for epub2 e-readers, then save it and open that on your Sony.

https://sigil-ebook.com/sigil/download/

gingerbeardman · 12-07-2021, 04:52 PM

I have Sigil so it sounds like some real testing is needed.

I'll do it soon.

gingerbeardman · 12-08-2021, 06:39 AM

Results of the test...

TOC links lead to unexpected destination:
- epub3
- epub3+sigil

TOC links behave as expected:
- epub2

So, I'd like to understand why this is happening if possible?

Using Calibre's ebook-edit compare books feature: for this book I can see only one meaningful difference between epub2 and epub3.

nav.xhtml:
- epub2 uses a container div, id="toc"
- epub3 uses a container nav element, type+id="toc"; and a secondary nav element, type+id="landmarks"

12-07-2021, 02:21 PM	#5
gingerbeardman Zealot Posts: 129 Karma: 1001024 Join Date: Apr 2010 Location: Cornwall, UK Device: Various Sony Readers, Kobo Touch Edition, iPhone	The photo above is the Reader's own user interface TOC display. I'm not sure which it represents. But the inline links on the TOC nav page (page 2, iirc) also exhibit the same behaviour. I'll generate an epub2 later on and see if that makes a difference. Last edited by gingerbeardman; 12-07-2021 at 02:23 PM.

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12-07-2021, 01:07 PM	#3
gingerbeardman Zealot Posts: 129 Karma: 1001024 Join Date: Apr 2010 Location: Cornwall, UK Device: Various Sony Readers, Kobo Touch Edition, iPhone	The epub opens and reads just fine on my Sony. It's just the TOC links that are wrong. Is this symptomatic of lack of support for epub 3 in your experience?

12-07-2021, 01:28 PM	#4
DNSB Bibliophagist Posts: 35,399 Karma: 145435140 Join Date: Jul 2010 Location: Vancouver Device: Kobo Sage, Forma, Clara HD, Lenovo M8 FHD, Paperwhite 4, Tolino epos	Are you using the links in the nav.xhtml file as an in-line ToC or are you using the toc.ncx (unneeded by epub3 but often included for epub2 compatibility)?

12-07-2021, 04:28 PM	#6
hobnail Running with scissors Posts: 1,552 Karma: 14325282 Join Date: Nov 2019 Device: none	I'd be curious to see how it works if you take your epub that you got from pandoc and open it in sigil and in sigil go to the Tools menu and go down to Epub3 Tools and select Generate NCX/Guide for epub2 e-readers, then save it and open that on your Sony. https://sigil-ebook.com/sigil/download/

12-07-2021, 04:52 PM	#7
gingerbeardman Zealot Posts: 129 Karma: 1001024 Join Date: Apr 2010 Location: Cornwall, UK Device: Various Sony Readers, Kobo Touch Edition, iPhone	I have Sigil so it sounds like some real testing is needed. I'll do it soon.

12-08-2021, 06:39 AM	#8
gingerbeardman Zealot Posts: 129 Karma: 1001024 Join Date: Apr 2010 Location: Cornwall, UK Device: Various Sony Readers, Kobo Touch Edition, iPhone	Results of the test... TOC links lead to unexpected destination: - epub3 - epub3+sigil TOC links behave as expected: - epub2 So, I'd like to understand why this is happening if possible? Using Calibre's ebook-edit compare books feature: for this book I can see only one meaningful difference between epub2 and epub3. nav.xhtml: - epub2 uses a container div, id="toc" - epub3 uses a container nav element, type+id="toc"; and a secondary nav element, type+id="landmarks"

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