Add onClick to Button in Ktor with Kotlinx - kotlin

Question

I am currently trying out Ktor. But it already fails on registering a onClickListener to the button.
I am just wondering because the onClick extends from String. If I click on the onClick the Code I get is this one:
var CommonAttributeGroupFacade.onClick : String
get() = attributeStringString.get(this, "onclick")
set(newValue) {attributeStringString.set(this, "onclick", newValue)}
So I think onClick has a getter and setter but not more. I installed location and FreeMarker so this is my route:
get<CharityRoute> {
val id = it.id
call.respondHtml {
body {
h1 { +"${it.id}" }
ul {
for (n in it.list) {
li { +"$n" }
}
}
button {
text("Run function")
onClick = "Hello"
}
}
}
}
Maybe someone has more experience with Ktor and especially with Kotlinx.

Answer 1

Problem
It depends which module you are working in.
On the server-side (JVM) you can not write Javascript-Code in Kotlin and assign it to a function like that.
To find a solution, I have to further know, what exactly it is you want to achieve.
Here are two of many possibilities, what you could do:
Solution 1
You can assign a javascript-code as string. You did just that by assigning the code "Hello".
Maybe you want to call a function, which was globally made available in the window object?
Solution 2
In client-side JS code, you can import kotlinx.html.js.onClickFunction and simply write
button{
onClickFunction = { println("clicked") }
}
to execute code written in Kotlin.