Fix bug if the immediate offset parent is not also the immediate scrollable parent #16
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If the immediate parent was not scrollable, the code would attempt to find the first parent that is scrollable. However, it did not account for any offsets in elY that occur as we find the parent that is scrollable. Hence, it would scroll a bit (a lot) higher than where the intended element actually is.
If the immediate parent was not scrollable, the code would attempt to find the first parent that is scrollable. However, it did not account for any offsets in `elY` that occur as we find the parent that is scrollable. Hence, it would scroll a bit (a lot) higher than where the intended element actually is.
theKidOfArcrania
changed the title
theKidOfArcrania
changed the title
This accounts for when the immediate scrollable parent isn't also positioned.
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The original code uses
Element.offsetTopandElement.offsetLeftto determine the offsets for the element within theElement.offsetParent. The code assumes that theoffsetParentis the parent closest to the node that is scrollable. However, this is not always the case. The API says that the offsetParent is the parent closes the node that is positioned (i.e. hasposition: relativeorposition: absolutein the css), or it returnsbodyif none of the parents are positioned. The code would run into a problem if one of the node's parents are positioned, but none of them are scrollable (it would use the offsets of the positioned parent and use those numbers to scroll the body). It would also run into a problem if one of the node's parents are scrollable, but aren't positioned (i.e. if you set amax-heightin the css and also setoverflow-y: scroll).