in templates/ydotm/bootstrap3.js [1599:1622]
ScrollSpy.prototype.process = function () {
var scrollTop = this.$scrollElement.scrollTop() + this.options.offset
var scrollHeight = this.$scrollElement[0].scrollHeight || this.$body[0].scrollHeight
var maxScroll = scrollHeight - this.$scrollElement.height()
var offsets = this.offsets
var targets = this.targets
var activeTarget = this.activeTarget
var i
if (scrollTop >= maxScroll) {
return activeTarget != (i = targets.last()[0]) && this.activate(i)
}
if (activeTarget && scrollTop <= offsets[0]) {
return activeTarget != (i = targets[0]) && this.activate(i)
}
for (i = offsets.length; i--;) {
activeTarget != targets[i]
&& scrollTop >= offsets[i]
&& (!offsets[i + 1] || scrollTop <= offsets[i + 1])
&& this.activate( targets[i] )
}
}