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Kequc avatar Kequc commented on August 14, 2024

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.

Kequc avatar Kequc commented on August 14, 2024

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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