Solutions
Multiplatform
Server-side
Data science
Android
Docs
Community
Teach
Play
Playground
Examples
Koans
toggle menu
Kotlin libraries
2.0
2.0
1.9
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
JS
Wasm-JS
switch theme
search in API
kotlin-stdlib
/
org.w3c.dom
/
WebSocket
/
onopen
onopen
JS
Wasm-JS
var
onopen
:
(
Event
)
->
dynamic
?
(
source
)
Since Kotlin
1.1
var
onopen
:
(
Event
)
->
Unit
?
(
source
)
Since Kotlin
1.8
Thanks for your feedback!
Was this page helpful?
Yes
No
How can we improve?
Enter your name and email address if you would like to receive a follow-up message or
contact our support
.
By submitting this form, I agree that JetBrains s.r.o. ("JetBrains") may use my name, email address, phone number, and country of residence to provide support. I agree that JetBrains may process said data using
third-party services
for this purpose in accordance with the
JetBrains Privacy Policy
.