I can't figure out how Kotlin's multiplatform for JS wants me to invoke `window.onload()`. the docum...

# getting-started

[Ray Rahke]

I can't figure out how Kotlin's multiplatform for JS wants me to invoke window.onload(). the documentation is either hard to find or nonexistant

[Joffrey]

Is this function listed in JS at all? Could you please link to the W3C docs or other that mentions that window.load() should exist?

All I see is the load event and thus the window.onload event listener that you can assign:

import kotlinx.browser.*

fun main() {
    window.onload = { event -> 
        println("Received event $event")
    }
}

[Adam S]

maybe you want a 'load' event listener?

https://developer.mozilla.org/en-US/docs/Web/API/Window/load_event#examples

https://kotlinlang.org/api/latest/jvm/stdlib/org.w3c.dom.events/-event-target/add-event-listener.html

[Ray Rahke]

no I meant onload

[Ray Rahke]

but I also could not find anything usefu on the docs for onload

[Ray Rahke]

i was getting Type mismatch: inferred type is () -> Unit but Event was expected

[Ray Rahke]

window.onload?.invoke() { event ->
        print("loaded")
    }

e: Type mismatch: inferred type is ([Error type: Cannot infer a lambda parameter type]) -> Unit but Event was expected
e: Cannot infer a type for this parameter. Please specify it explicitly.

[Ray Rahke]

annotating it as event: Event -> just gives me

Unresolved reference: Event

[Robert Jaros]

you can always do event: dynamic

[Ray Rahke]

that got rid of one of the errors

[Ray Rahke]

import kotlinx.browser.*
import org.w3c.dom.*


fun main() {
    val kotlin = "🙂"
    window.addEventListener("load") { event: dynamic ->
        print("hello")
    }
    println(kotlin)
}

None of the following functions can be called with the arguments supplied: public final fun addEventListener(type: String, callback: ((Event) -> Unit)?, options: dynamic = ...): Unit defined in org.w3c.dom.Window public final fun addEventListener(type: String, callback: EventListener?, options: dynamic = ...): Unit defined in org.w3c.dom.Window

[Ray Rahke]

oh typo, the lambda should be a second arugment