Hello already tried to use MutationObserver? I w...

# javascript

[Tristan Caron]

Hello already tried to use MutationObserver?

I want to observer an input element:

val el = document.querySelector("#my-element")!! as HTMLInputElement
    val observer = MutationObserver { _, _ ->
        println("changes")
    }

    observer.observe(el, MutationObserverInit(attributes = true))

But I'm always getting

Uncaught TypeError: Failed to execute 'observe' on 'MutationObserver': The provided value cannot be converted to a sequence.

Any ideas?

[anton.bannykh]

Could you try passing MutationObserverInit(attributes = true, attributeFilter = undefined) instead?

[anton.bannykh]

@Tristan Caron I've been able to reproduce the error. It seems that the default value of attributeFilter (null) is causing the problem.

[anton.bannykh]

Setting it to undefined manually fixed the issue in my case

[anton.bannykh]

Reported to youtrack: https://youtrack.jetbrains.com/issue/KT-22293

[Tristan Caron]

Whoua so efficient, thanks a lot.