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Oh.Danny.Boy · 05-17-2012, 05:24 PM

I understand this is not specifically a development forum, but I have a question regarding PageList parsing in an iOS environment. (I only see Development area for Kindle/Nook).

PageList and supporting targets are fairly straightforward. A list of anchors referring to their respective file (src), and a playOrder for well, ordering. My question is how do eReaders actually detect when anchors are in view?

For example, a document at 768px wide by 10,000px height may have 20 PageTargets (pg i, pg ii, pg 1, pg 2, pg 3 ... so on). What mechanism are ePub rendering engines on the web, desktop, and specifically iOS using to detect the closest anchor relative to a users position (XY coordinates)?

There seems to be nothing in Javascript or Objective-C which does this. Voodoo functionality.

05-17-2012, 05:24 PM	#1
Oh.Danny.Boy Junior Member Posts: 1 Karma: 10 Join Date: May 2012 Device: none	PageList parsing using Javascript. I understand this is not specifically a development forum, but I have a question regarding PageList parsing in an iOS environment. (I only see Development area for Kindle/Nook). PageList and supporting targets are fairly straightforward. A list of anchors referring to their respective file (src), and a playOrder for well, ordering. My question is how do eReaders actually detect when anchors are in view? For example, a document at 768px wide by 10,000px height may have 20 PageTargets (pg i, pg ii, pg 1, pg 2, pg 3 ... so on). What mechanism are ePub rendering engines on the web, desktop, and specifically iOS using to detect the closest anchor relative to a users position (XY coordinates)? There seems to be nothing in Javascript or Objective-C which does this. Voodoo functionality.