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kotlinlang

Can someone point me to kotlin browser side websockets?  Google searching turns up lots of server side code and tutorials which use regular javascript on the browser side.  I am finding it extremely challenging to find information about kotlin js, in fact I don't even know if that is a thing.  I am using the html DSL in a create-kotlin-react project.  Maybe I came to this party too late.  Need a break through.

BTW, I got REST calls working. Now I want to switch the app over to ws to make a multi user thing work.

I’ve used websockets by adapting the Ktor sample client from JS to Kotlin using the standard browser Websocket API <https://github.com/ktorio/ktor-samples/blob/master/app/chat/resources/web/main.js>

```fun main() {
    connect()
}

fun connect() {
    // First we create the socket.
    // The socket will be connected automatically asap. Not now but after returning to the event loop,
    // so we can register handlers safely before the connection is performed.
    console.log("Begin connect")
    if (window.location.protocol == "https:") {
        socket = WebSocket("wss://" + window.location.host + "/ws")
    } else {
        socket = WebSocket("ws://" + window.location.host + "/ws")
    }

    // We set a handler that will be executed if the socket has any kind of unexpected error.
    // Since this is a just sample, we only report it at the console instead of making more complex things.
    socket!!.onerror = {

    }

    // We set a handler upon connection.
    // What this does is to put a text in the messages container notifying about this event.
    socket!!.onopen = {

    }

    // If the connection was closed gracefully (either normally or with a reason from the server),
    // we have this handler to notify to the user via the messages container.
    // Also we will retry a connection after 5 seconds.
    socket!!.onclose = { ev -&gt;
        val evt = ev.asDynamic()
        // Try to gather an explanation about why this was closed.
        var explanation = ""
        if (evt.reason &amp;&amp; evt.reason.length &gt; 0) {
            explanation = "reason: " + evt.reason
        } else {
            explanation = "without a reason specified"
        }

        // Notify the user using the messages container.
        handleTextMessage("info", "Disconnected with close code " + evt.code + " and " + explanation)
        // Try to reconnect after 5 seconds.
        window.setTimeout({ connect() }, 5000)
    }

    // If we receive a message from the server, we want to handle it.
    socket!!.onmessage = { ev -&gt;

    }
}```

thank you,  I will give this a try tonight after work.

<https://discuss.kotlinlang.org/t/js-coroutines-experiements/8245/2>

<@UFT11FKSP> What is the javascript bit at the top?

Actually, the confusing part is the "Inside Javascript"

I don't know, I'm not the author :slightly_smiling_face:

But I'm using this websocket implementation in KVision, and it works quite well :-)