(Sorry for the late reply) This is what I would li...

# javascript

[Lawik]

(Sorry for the late reply)
This is what I would like to achieve (I use props/state/class components but it should be the same):

-.kt

[Roman Artemev [JB]]

Am I correct that input calls attrs.onChangeFunction?

[Lawik]

yes

[Roman Artemev [JB]]

Probably you could do something like

fun RBuilder.a(block: RDOMBuilder<INPUT>.() -> Unit) = input {
    apply(block)
    val existed = attrs.onChangeFunction
    attrs.onChangeFunction = {
       println("Hello A")
       existed()
    }
}

[Lawik]

cause_th0jdv$_0: null
message_8yp7un$_0: "You can't read variable onChange"
name: "UnsupportedOperationException"

😔

[Roman Artemev [JB]]

Oops, which React bindings do you use?

[Lawik]

You mean which wrappers? If so:

'org.jetbrains:kotlin-react:16.6.0-pre.70-kotlin-1.3.21'
'org.jetbrains:kotlin-react-dom:16.6.0-pre.70-kotlin-1.3.21'

[Roman Artemev [JB]]

Seems like an issue in kotlinx.html. Will ask relevant person and let you know

[Lawik]

Alright, thanks!

[Roman Artemev [JB]]

What is kotlin type of attrs.onChangeFunction?

[Lawik]

var CommonAttributeGroupFacade.onChangeFunction : (Event) -> Unit
    get()  = throw UnsupportedOperationException("You can't read variable onChange")
    set(newValue) {consumer.onTagEvent(this, "onchange", newValue)}

[Roman Artemev [JB]]

Folks from kotlinx.html say that currently there is no solution other than save original lambda somewhere and re-use it when needed.
What else I would suggest is try using dynamic like this
attrs.asDynamic().onChange

[Lawik]

Alright, I'll try out both solutions soon, thanks a lot for the help!