javascript - Current Reading Position and Progress in iBooks with js -

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i'm trying calculate current reading position , reading progress of epub opened in ibooks. in other reading systems (like readium or adobe rmsdk) position of content relative viewport can use

var firstrect = nodes[0].getboundingclientrect(); var lastrect = nodes[nodes.length- 1].getboundingclientrect();

so can calculate progress like

var progress=firstrect.left+lastrect.left>0?math.round(math.abs(firstrect.left*100)/(math.abs(firstrect.left)+lastrect.left)):100;

although ibooks webkit based , allows use of js compliant epub3 standard - position of rects not change when content scrolled in ibooks view, i.e. stays same.

i'm stuck here. thoughts?

i want integrate functionality open source library epubtrack.js


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