Inconsistent link behaviour in Book Reader

Agama · 10-25-2015, 06:32 AM

I am revisiting an old friend in ePub format which I produced some years ago from a plain text source, and I am finding inconsistent behaviour in calibre's book reader. I guess it's probably some feature which didn't exist when I made the book but is now getting accidentally triggered.

Some links work as expected and simply jump to the referenced chapter/paragraph, but others cause the reader to display a new pane with the referenced target displayed as a footnote.

Any ideas on what might be going on and how to fix it would be welcome.

kovidgoyal · 10-25-2015, 06:33 AM

Your links are triggerring the footnote detection heuristic. That can happen for a few reasons, hard to say which one applies without looking at the book in question.

Agama · 10-25-2015, 06:42 AM

Links that work are forward links like this one in file xlec5.html:

but those that trigger footnotes are the return links which look like this one in file zguide5.html:

<p><a id="lnk0" class="buto" href="xlec5.html">+</a><b>Fifth Lecture</b></p>

This causes file xlec5.html to display in the footnote window instead of jumping back to the top of chapter 5 in the main display.

kovidgoyal · 10-25-2015, 07:38 AM

It's not just the markup, it is the CSS also. The reader uses various factors, like the vertical alignment, whether the link points to a file that has a link pointing back to it, epub 3 footnote markup, etc.

Agama · 10-25-2015, 08:40 AM

Thanks for the info. I'll do some tweaking and research to see if I can stop it happening.

Agama · 10-25-2015, 08:55 AM

Stopped it by removing the 2-way linking and relying on the reader's back button instead.

10-25-2015, 06:32 AM	#1
Agama Guru Posts: 776 Karma: 2751519 Join Date: Jul 2010 Location: UK Device: PW2, Nexus7	Inconsistent link behaviour in Book Reader I am revisiting an old friend in ePub format which I produced some years ago from a plain text source, and I am finding inconsistent behaviour in calibre's book reader. I guess it's probably some feature which didn't exist when I made the book but is now getting accidentally triggered. Some links work as expected and simply jump to the referenced chapter/paragraph, but others cause the reader to display a new pane with the referenced target displayed as a footnote. Any ideas on what might be going on and how to fix it would be welcome.

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10-25-2015, 06:33 AM	#2
kovidgoyal creator of calibre Posts: 45,681 Karma: 28549304 Join Date: Oct 2006 Location: Mumbai, India Device: Various	Your links are triggerring the footnote detection heuristic. That can happen for a few reasons, hard to say which one applies without looking at the book in question.

10-25-2015, 06:42 AM	#3
Agama Guru Posts: 776 Karma: 2751519 Join Date: Jul 2010 Location: UK Device: PW2, Nexus7	Links that work are forward links like this one in file xlec5.html: <h4><a id="lnk0" class="butn" href="zguide5.html#lnk0">+</a></h4> but those that trigger footnotes are the return links which look like this one in file zguide5.html: <p><a id="lnk0" class="buto" href="xlec5.html">+</a><b>Fifth Lecture</b></p> This causes file xlec5.html to display in the footnote window instead of jumping back to the top of chapter 5 in the main display.

10-25-2015, 07:38 AM	#4
kovidgoyal creator of calibre Posts: 45,681 Karma: 28549304 Join Date: Oct 2006 Location: Mumbai, India Device: Various	It's not just the markup, it is the CSS also. The reader uses various factors, like the vertical alignment, whether the link points to a file that has a link pointing back to it, epub 3 footnote markup, etc.

10-25-2015, 08:40 AM	#5
Agama Guru Posts: 776 Karma: 2751519 Join Date: Jul 2010 Location: UK Device: PW2, Nexus7	Thanks for the info. I'll do some tweaking and research to see if I can stop it happening.

10-25-2015, 08:55 AM	#6
Agama Guru Posts: 776 Karma: 2751519 Join Date: Jul 2010 Location: UK Device: PW2, Nexus7	Stopped it by removing the 2-way linking and relying on the reader's back button instead.

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