Calibre ebook viewer - epub - links shown as footnotes

epubauthor · 04-10-2016, 05:09 PM

Hello,

I've noticed that in an epub file, links whose text contains 1.2 Title text Xx</a>
This one opens the destination in the footnotes panel.
All the links are in the TOC file. That is, an XHTML file with the TOC. The epub also contains a spine which works as expected (no sup/sub text shown though).
I'm using the latest Calibre version, 2.54.0 x86, on Windows 7 x64.

I remember this not being the case in some previous version - can't remember which one though. It does not happen in the 1.48 x86 version (on Windows XP x86).

In an older epub, I had footnotes displayed only on links as the one below:
<a href="../Text/15.xhtml#Anchor-94">1</a>

This, of course, is not a showstopper issue. I'm interested in hearing your thoughts.

Kind regards

p.s.
The captcha is too hard to solve! It took four tries! :-)

theducks · 04-10-2016, 05:21 PM

Not sure what your problem is

 simply means [sub] subscript[/sub] the text

The rendering engine may not always honor the instructions

epubauthor · 04-10-2016, 05:49 PM

Here is an example epub, to illustrate the issue.

p.s.
The captchas are getting increasingly difficult!

BetterRed · 04-10-2016, 06:17 PM

Please post complaints regarding Mobileread in Feedback, Calibre Developers and Moderators cannot do anything about the behaviour of the forum itself.

The footnote display feature was introduced into the viewer in Release: 2.9 [07 Nov, 2014]. How do I know that, because I just did find 'footnote' on this captcha-free web page calibre - What's new

I suggest you open a book in the calibre book editor with endnotes that work as you would expect, and examine how they're implemented - the Tools->Reports->Links is very useful in this regard.

BR

kovidgoyal · 04-10-2016, 06:37 PM

The viewer uses heuristics to detect the presence of footnote links. If you want to ensure a link is not detected as a footnote link, even if it uses sup/sub give it a epub:type="link" attribute.

Although I can probably improve the heuristic to handle this particular case better -- when a link contains non-empty text in addition to a sup/sub

epubauthor · 04-10-2016, 06:38 PM

Well, I probably failed to view that page while searching for this behaviour.

So, this is the one that did it:
---
Release: 2.48 [01 Jan, 2016]
Bug Fixes
E-book viewer: When using heuristics to detect footnote links check for vertical-align set to top and bottom as well as sub and super
---

I've just noticed that I can use Clips in Sigil to perform modifications on the selected text. It's a single click action too, just like the sub and sup buttons! Nice!
I'm going to use css to apply the sup and sub format, instead of sup and sub tags.
Going to ReRTFM now...

Thank you BetterRed for providing directions.
I consider the matter solved.

Regards

BetterRed · 04-10-2016, 06:48 PM

Another tool you might find useful is this one - [SIGIL] Plugin for inserting endnotes in an epub 2.0

I don't think there's an equivalent for the calibre book editor, maybe it could be ported

And the calibre book editor equivalent of Sigil's clips is Snippets

BR

epubauthor · 04-10-2016, 06:49 PM

Hello kovidgoyal,

I read your answer after replying to BetterRed.
How can I use the epub:type="link" attribute?
I've tried <a type="link" href="../Text/07.xhtml#toc_marker-4-2">1.2 text with subsub</a> to no avail.

Regards

kovidgoyal · 04-10-2016, 06:52 PM

Code:

<a epub:type="link" href="../Text/07.xhtml#toc_marker-4-2">1.2 text with sub<sub>sub</sub></a>

Although, I have already fixed the heuristic for that case https://github.com/kovidgoyal/calibr...9fa0f2151ececa

epubauthor · 04-10-2016, 07:02 PM

Hello kovidgoyal,

ok, the epub:type="link" works fine, although EpubCheck complains a bit... I do see though that it's probably a bug of EpubCheck, so no sweat.
I also see it was easy to adjust the heuristic check too! Nice one!

Regards

bobb40 · 06-12-2018, 07:38 AM

Kovid -
The calibre viewer is the best around, but I want an ebook to be compatible with other viewers too. Your "fix" (epub:type="link") for disabling footnotes does work for getting to the footnote, but it causes "epubcheck" errors and it prevents simple return from a note to the main text. Please consider putting "footnotes" into "preferences", so that all footnote code is avoided by those who do not want it. Thanks.

kovidgoyal · 06-12-2018, 08:18 AM

epub:type="link" comes from the epub standard. If epubcheck is complaining about it, epubcheck is broken, which is not surprising considering it is not maintained any more.

And if you want to return from such a link, you simply usethe back function, just as you would for any other link.

04-10-2016, 05:09 PM	#1
epubauthor Junior Member Posts: 6 Karma: 10 Join Date: Feb 2016 Device: none	Calibre ebook viewer - epub - links shown as footnotes Hello, I've noticed that in an epub file, links whose text contains <sub></sub text are displayed in the footnotes panel. E.g.: <a href="../Text/07.xhtml#toc_marker-4-2">1.2 Title text X<sub>x</sub></a> This one opens the destination in the footnotes panel. All the links are in the TOC file. That is, an XHTML file with the TOC. The epub also contains a spine which works as expected (no sup/sub text shown though). I'm using the latest Calibre version, 2.54.0 x86, on Windows 7 x64. I remember this not being the case in some previous version - can't remember which one though. It does not happen in the 1.48 x86 version (on Windows XP x86). In an older epub, I had footnotes displayed only on links as the one below: <a href="../Text/15.xhtml#Anchor-94"><span class="endnote-marker char-style-override-1">1</span></a> This, of course, is not a showstopper issue. I'm interested in hearing your thoughts. Kind regards p.s. The captcha is too hard to solve! It took four tries! :-)

04-10-2016, 05:21 PM	#2
theducks Well trained by Cats Posts: 29,800 Karma: 54830978 Join Date: Aug 2009 Location: The Central Coast of California Device: Kobo Libra2,Kobo Aura2v1, K4NT(Fixed: New Bat.), Galaxy Tab A	Not sure what your problem is <sub> simply means [sub] subscript[/sub] the text The rendering engine may not always honor the instructions

04-10-2016, 06:17 PM	#4
BetterRed null operator (he/him) Posts: 20,568 Karma: 26954694 Join Date: Mar 2012 Location: Sydney Australia Device: none	Please post complaints regarding Mobileread in Feedback, Calibre Developers and Moderators cannot do anything about the behaviour of the forum itself. The footnote display feature was introduced into the viewer in Release: 2.9 [07 Nov, 2014]. How do I know that, because I just did find 'footnote' on this captcha-free web page calibre - What's new I suggest you open a book in the calibre book editor with endnotes that work as you would expect, and examine how they're implemented - the Tools->Reports->Links is very useful in this regard. BR Last edited by BetterRed; 04-10-2016 at 06:33 PM.

04-10-2016, 06:38 PM	#6
epubauthor Junior Member Posts: 6 Karma: 10 Join Date: Feb 2016 Device: none	[SOLVED] Well, I probably failed to view that page while searching for this behaviour. So, this is the one that did it: --- Release: 2.48 [01 Jan, 2016] Bug Fixes E-book viewer: When using heuristics to detect footnote links check for vertical-align set to top and bottom as well as sub and super --- I've just noticed that I can use Clips in Sigil to perform modifications on the selected text. It's a single click action too, just like the sub and sup buttons! Nice! I'm going to use css to apply the sup and sub format, instead of sup and sub tags. Going to ReRTFM now... Thank you BetterRed for providing directions. I consider the matter solved. Regards

04-10-2016, 06:48 PM	#7
BetterRed null operator (he/him) Posts: 20,568 Karma: 26954694 Join Date: Mar 2012 Location: Sydney Australia Device: none	Another tool you might find useful is this one - [SIGIL] Plugin for inserting endnotes in an epub 2.0 I don't think there's an equivalent for the calibre book editor, maybe it could be ported And the calibre book editor equivalent of Sigil's clips is Snippets BR Last edited by BetterRed; 04-10-2016 at 06:55 PM.

04-10-2016, 06:37 PM	#5
kovidgoyal creator of calibre Posts: 43,858 Karma: 22666666 Join Date: Oct 2006 Location: Mumbai, India Device: Various	The viewer uses heuristics to detect the presence of footnote links. If you want to ensure a link is not detected as a footnote link, even if it uses sup/sub give it a epub:type="link" attribute. Although I can probably improve the heuristic to handle this particular case better -- when a link contains non-empty text in addition to a sup/sub

04-10-2016, 06:49 PM	#8
epubauthor Junior Member Posts: 6 Karma: 10 Join Date: Feb 2016 Device: none	Hello kovidgoyal, I read your answer after replying to BetterRed. How can I use the epub:type="link" attribute? I've tried <a type="link" href="../Text/07.xhtml#toc_marker-4-2">1.2 text with sub<sub>sub</sub></a> to no avail. Regards

04-10-2016, 06:52 PM	#9
kovidgoyal creator of calibre Posts: 43,858 Karma: 22666666 Join Date: Oct 2006 Location: Mumbai, India Device: Various	Code: <a epub:type="link" href="../Text/07.xhtml#toc_marker-4-2">1.2 text with sub<sub>sub</sub></a> Although, I have already fixed the heuristic for that case https://github.com/kovidgoyal/calibr...9fa0f2151ececa

04-10-2016, 07:02 PM	#10
epubauthor Junior Member Posts: 6 Karma: 10 Join Date: Feb 2016 Device: none	Hello kovidgoyal, ok, the epub:type="link" works fine, although EpubCheck complains a bit... I do see though that it's probably a bug of EpubCheck, so no sweat. I also see it was easy to adjust the heuristic check too! Nice one! Regards

06-12-2018, 07:38 AM	#11
bobb40 Enthusiast Posts: 28 Karma: 274 Join Date: Jul 2011 Device: Kindle3, Kindle4, KoboGlo	Footnotes/Endnotes Kovid - The calibre viewer is the best around, but I want an ebook to be compatible with other viewers too. Your "fix" (epub:type="link") for disabling footnotes does work for getting to the footnote, but it causes "epubcheck" errors and it prevents simple return from a note to the main text. Please consider putting "footnotes" into "preferences", so that all footnote code is avoided by those who do not want it. Thanks.

06-12-2018, 08:18 AM	#12
kovidgoyal creator of calibre Posts: 43,858 Karma: 22666666 Join Date: Oct 2006 Location: Mumbai, India Device: Various	epub:type="link" comes from the epub standard. If epubcheck is complaining about it, epubcheck is broken, which is not surprising considering it is not maintained any more. And if you want to return from such a link, you simply usethe back function, just as you would for any other link.

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