FeatureApp.kt

package kweb.demos.feature

import io.ktor.application.*
import io.ktor.features.Compression
import io.ktor.features.DefaultHeaders
import io.ktor.http.cio.websocket.pingPeriod
import io.ktor.http.cio.websocket.timeout
import io.ktor.response.*
import io.ktor.routing.*
import io.ktor.server.engine.embeddedServer
import io.ktor.server.jetty.Jetty
import io.ktor.websocket.WebSockets
import kweb.*
import kweb.state.KVar
import java.time.Duration

fun main() {
    embeddedServer(Jetty, port = 16097, module = Application::kwebFeature).start()
}

private fun Application.kwebFeature() {
    install(DefaultHeaders)
    install(Compression)
    install(WebSockets) {
        pingPeriod = Duration.ofSeconds(10)
        timeout = Duration.ofSeconds(30)
    }

    install(Kweb)

    routing {
        get("/staticpage") {
            call.respondText("This is a static page and it won't be routed via Kweb")
        }
    }

    // You can also do:
    // routing {
    //     get("/{visitedUrl...}") {
    //         call.respondKweb(buildPage)
    //     }
    // }
    installKwebOnRemainingRoutes {
        doc.body.new {
            val greeting = url.map { it.removePrefix("/") }.map { "Hello " + if (it.isNotBlank()) it else "World" }

            val next = KVar("")

            h1().text(greeting)
            span().text("Where to next?")
            input().setValue(next)
            button().text("Go!").on.click {
                url.value = next.value
            }
        }
    }
}