KotlinJs - simple HTTP GET without Dynamic Type functionality

Question

I'm totally new in KotlinJs and I wanted to check its potential in server-less service development.

I decided to start with calling external API with HTTP GET method using XMLHttpRequest() suggested in KotlinJs documentation. However, I cannot come up with any way of using it without dynamic mechanism.

fun main(args: Array<String>) {

    val url = "https://jsonplaceholder.typicode.com/todos/1"

    var xhttp: dynamic = XMLHttpRequest()
    xhttp.open("GET", url, true)
    xhttp.onreadystatechange = fun() {
        if (xhttp.readyState == 4) {
            println(xhttp.responseJson)
        }
    }
    xhttp.send()
}

Of course this example works perfectly fine, but I feel like it has to be better way of doing it without disabling Kotlin's type checker.

Is there any way of doing it using KotlinJs only (without dynamic) ?
If it is not possible, could someone at least explain why?

Przemysław Gęsieniec · Accepted Answer · 2019-04-04 13:45:49Z

0

I found a way for not using dynamic with callbacks, just like in classic .js

private fun getData(input: String, callback: (String) -> Unit) {

    val url = "https://jsonplaceholder.typicode.com/todos/$input"
    val xmlHttp = XMLHttpRequest()
    xmlHttp.open("GET", url)
    xmlHttp.onload = {
        if (xmlHttp.readyState == 4.toShort() && xmlHttp.status == 200.toShort()) {
            callback.invoke(xmlHttp.responseText)
        }
    }
    xmlHttp.send()
}

and than just call it:

getData("1") {
    response -> println(response)
}

Hopefully it will help someone in the future.

answered Apr 4, 2019 at 13:45

Przemysław Gęsieniec

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3 Comments

andylamax Over a year ago

Why don't you just use the fetch api? you can define it using the external keyword

Przemysław Gęsieniec Over a year ago

Its actualy also good idea, however at that time I had been using this language few hours in total. Thanks for diffrent solution suggestion ;)

andylamax Over a year ago

sure thing, If you need help defining the fetch api, I can write it down for you

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