Conditional reverse links? (depending on path)

patrik · 01-21-2015, 08:48 AM

I'm creating a book where I would like to return from the end of a chapter (xhtml file) to the page that got me there (by link). Is that possible?

What I am doing is this:

- Subject area A
--- Chapter X
--- Chapter Y
- Subject Area B
--- Chapter Z
--- Chapter X (same as the above X, duplicate in listings, uniqe in actual xhtml-file)

Each "Subject" page has a list of chapters. Some chapters can be in more than one Subject. All chapters are unique and has nothing to do with each other.

After reading a chapter, I would like to return to the Subject page I started from.

Jellby · 01-21-2015, 11:11 AM

I don't think it's possible without scripting.

odedta · 01-21-2015, 11:17 AM

As Jellby said, this cannot be done without scripting.
The first request you can accomplish by adding doing this:
<a href="javascript:history.back();">Back</a>

patrik · 01-21-2015, 12:28 PM

Ok, thanks.

Is javascript available in todays epub 2-readers or is that a epub 3 feature? (I googled a bit but found mostly hits in epub 3 docs.)

Edit:
Just tried this on my Kobo Aura HD, nothing seems to happen. Do I need to do something else to get scripting to work, or is it not yet available?

Edit 2:
Looking at http://epubtest.org/ it seems Kobo is not supporting much of javascript....

DaleDe · 01-21-2015, 12:47 PM

Scripting is not supported in ePub 2. Some readers have a back button but many do not. ePub 3 does support scripting but there are only a few ePub 3 readers available.

If there is a finite number of cases for this you could have multiple links to do the return and the user could then select the one they wanted.

Dale

01-21-2015, 08:48 AM	#1
patrik Guru Posts: 682 Karma: 4568205 Join Date: Jan 2010 Location: Sweden Device: Kobo Forma	Conditional reverse links? (depending on path) I'm creating a book where I would like to return from the end of a chapter (xhtml file) to the page that got me there (by link). Is that possible? What I am doing is this: - Subject area A --- Chapter X --- Chapter Y - Subject Area B --- Chapter Z --- Chapter X (same as the above X, duplicate in listings, uniqe in actual xhtml-file) Each "Subject" page has a list of chapters. Some chapters can be in more than one Subject. All chapters are unique and has nothing to do with each other. After reading a chapter, I would like to return to the Subject page I started from.

01-21-2015, 12:28 PM	#4
patrik Guru Posts: 682 Karma: 4568205 Join Date: Jan 2010 Location: Sweden Device: Kobo Forma	Ok, thanks. Is javascript available in todays epub 2-readers or is that a epub 3 feature? (I googled a bit but found mostly hits in epub 3 docs.) Edit: Just tried this on my Kobo Aura HD, nothing seems to happen. Do I need to do something else to get scripting to work, or is it not yet available? Edit 2: Looking at http://epubtest.org/ it seems Kobo is not supporting much of javascript.... Last edited by patrik; 01-21-2015 at 12:43 PM. Reason: added info

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01-21-2015, 11:11 AM	#2
Jellby frumious Bandersnatch Posts: 7,546 Karma: 19001583 Join Date: Jan 2008 Location: Spaniard in Sweden Device: Cybook Orizon, Kobo Aura	I don't think it's possible without scripting.

01-21-2015, 11:17 AM	#3
odedta Addict Posts: 398 Karma: 96448 Join Date: Dec 2013 Device: iPad	As Jellby said, this cannot be done without scripting. The first request you can accomplish by adding doing this: <a href="javascript:history.back();">Back</a>

01-21-2015, 12:47 PM	#5
DaleDe Grand Sorcerer Posts: 11,470 Karma: 13095790 Join Date: Aug 2007 Location: Grass Valley, CA Device: EB 1150, EZ Reader, Literati, iPad 2 & Air 2, iPhone 7	Scripting is not supported in ePub 2. Some readers have a back button but many do not. ePub 3 does support scripting but there are only a few ePub 3 readers available. If there is a finite number of cases for this you could have multiple links to do the return and the user could then select the one they wanted. Dale

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