Comments (2)
It would be useful to see index information on nodes in a summary.
div.number-1 [index: 0]
div.number-2 [index: 1] (removed)
div.number-3 [index: 2] (removed)
div.number-4 [index: 1] (added)
That would almost make oldPreviousSibling obsolete.
from mutation-summary.
The way MutationObserver works, from which MutationSummary is built. The MutationObserver returns individual removal records but sometimes many at the same time.
var divs = document.querySelectorAll('div');
divs[2].remove();
divs[1].remove();
You'll receive an array containing both removals from the MutationObserver. divs[2]
's mutation previousElementSibling would be div[0]
and div[1]
's mutation previousElementSibling would also be div[0]
. Both the same.
You could then do some maths to figure out what the indexes were, but not necessarily the order they were in before removal. MutationSummary though, does add a little bit more complexity. A lookup of the old positioning should be possible.
from mutation-summary.
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from mutation-summary.