Cleaner attributeFilter/attributeOldValue example (MutationObserver) #32656
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Simplify example callback. Old version had a typo, ` userStatusChanged(mutation.target.username, mutation.target.status);` ➝ ` userStatusChanged(mutation.oldValue, mutation.target.status);` Old version added in mdn#9737: https://github.com/mdn/content/pull/9737/files#diff-fc20b9f4adbc6723e9fe01425cea6512399d9a9bd69451d25f8fd6f0b8f92788R144-R170
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Description
Simplify callback, in the
MutationObserverexample illustrating the usage ofattributeFilter&attributeOldValue.Motivation
I thought the old version had a typo, in
userStatusChanged(mutation.target.username, mutation.target.status);,mutation.target.usernameseems like it should've beenmutation.oldValue, though after taking a closer look, this was probably intentional.While fixing this "typo", I decided the old callback was unnecessary complex -- e.g. the outer
switchwasn't doing anything (aside from serving as a future placeholder perhaps) -- so I made it a bit more "to the point". Also seems a tiny bit unusual to have an example that calls functions not provided (userStatusChanged&usernameChanged), this new one is a little easier to modify and begin playing with.Related issues and pull requests
Old version added in #9737:
https://github.com/mdn/content/pull/9737/files#diff-fc20b9f4adbc6723e9fe01425cea6512399d9a9bd69451d25f8fd6f0b8f92788R144-R170