There are many existing javascript functions accept JSON as paramters.
With Kotlin-Javascript, how can I generate JSON literals? And how can I declare traits for those methods?
E.g. Following is an existing javascript function:
function save(user) {
}
save({
name : “Freewind”,
age: 100
});
In my Kotlin-javascript code:
native fun save(user: ???) // what type?
save( ??? ) // what should be here?
If you use Klaxon, it would look like this:
save(json {
obj("name", "freewind", "age", 100)
})
The problem is that you save() method needs to accept the type that Klaxon returns for this (JsonObject).
It seems Klaxon can't work with Kotlin-javascript compiler. It invokes some java classes, which can be used to generate javascript source.
Yes, I know nothing about the Kotlin Javascript compiler. It would be nice to make Klaxon compatible with it but I have no idea what needs to be done right now.
Unfortunately right now you can't do it easily.
My solution:
``
native
class User {
val name: String = js.noImpl
val age: Int = js.noImpl
}
native(“Object”)
class MutableUser {
var name: String = js.noImpl
var age: Int = js.noImpl
}
fun User(name: String, age: Int): User {
val user = MutableUser()
user.name = name
user.age = age
return user as User
}
native fun save(user: User)
or just:
``
native(“Object”)
class User {
var name: String = js.noImpl
var age: Int = js.noImpl
}
fun User(name: String, age: Int): User {
val user = User()
user.name = name
user.age = age
return user
}
native fun save(user: User)
Another solution
You can declare class in JS:
``
function User(name, age) {
this.name = name;
this.age = age;
}
And write in Kotlin:
``
native class User(val name: String, val age: Int)
native fun save(user: User)
Thank you, this is the best solution so far.
I know this is an old question, but I thought I’d mention my solution: all my objects implement toJSON() metod, which returns their JSON representation, so in the case mentioned in this question User class in Kotlin would be:
class User(val name: String, val age: Int) {
fun toJSON(): String {
return "{\"name\": \"$name\", \"age\": $age}"
}
}
and in JavaScript you would call:
var user = new module_name.package_name.User('forinil2', 15)
save(user.toJSON())
Can someone convert the code from native to the current external way of doing things? I’m a bit confused by some things like how to specify (“Object”) and js.noImpl