Getting Started

Create a Project

To use fritz2, you have to set up a Kotlin multiplatform-project. To do so you can either

Setup Gradle Build

plugins {
    kotlin("multiplatform") version "1.6.10"
    // KSP support
    id("com.google.devtools.ksp") version "1.6.10-1.0.2"
}

repositories {
    mavenLocal()
    mavenCentral()
}

val fritz2Version = "1.0-RC1"

//group = "my.fritz2.app"
//version = "0.0.1-SNAPSHOT"

kotlin {
    jvm()
    js(IR) {
        browser()
    }.binaries.executable()

    sourceSets {
        val commonMain by getting {
            dependencies {
                implementation("dev.fritz2:core:$fritz2Version")
                // implementation("dev.fritz2:headless:$fritz2Version") // optional
            }
        }
        val jvmMain by getting {
            dependencies {
            }
        }
        val jsMain by getting {
            dependencies {
            }
        }
    }
}

/**
 * KSP support - start
 */
dependencies {
    add("kspMetadata", "dev.fritz2:lenses-annotation-processor:$fritz2Version")
}
kotlin.sourceSets.commonMain { kotlin.srcDir("build/generated/ksp/commonMain/kotlin") }
tasks.withType<org.jetbrains.kotlin.gradle.dsl.KotlinCompile<*>>().all {
    if (name != "kspKotlinMetadata") dependsOn("kspKotlinMetadata")
}
// needed to work on Apple Silicon. Should be fixed by 1.6.20 (https://youtrack.jetbrains.com/issue/KT-49109#focus=Comments-27-5259190.0-0)
rootProject.plugins.withType<org.jetbrains.kotlin.gradle.targets.js.nodejs.NodeJsRootPlugin> {
    rootProject.the<org.jetbrains.kotlin.gradle.targets.js.nodejs.NodeJsRootExtension>().nodeVersion = "16.0.0"
}
/**
 * KSP support - end
 */

Organize Your Code

When using the Kotlin Multiplatform project structure, we recommend organizing your code like this:

.
├── src
│   ├── commonMain
│   │   └── kotlin
│   │       └── <packages>
│   │           └── model.kt (common model for client (JS) and server (JVM))
│   └── jsMain
│       ├── kotlin
│       │   └── <packages>
│       │       └── app.kt  (contains main function)
│       └── resources
│           └── index.html  (starting point for your app)
├── build.gradle.kts  (dependencies and tasks)
└── settings.gradle.kts  (project name)

The index.html is just a normal web-page. Be sure to include the resulting script-file from your KotlinJS-build. You can mark an element of your choice with an id (or use the body by default) to later render your fritz2 tags to it:

<!doctype html>
<html>
  <head>
    <meta charset="UTF-8">
    <meta content="width=device-width, initial-scale=1" name="viewport">
  </head>
  <body id="target">
    Loading...
    <script src="<project-name>.js"></script>
  </body>
</html>

app.kt is the starting point of your fritz2 app, so make sure it has a main-function. Inside main, create some content by opening a render context and mount it to the DOM of your index.html:

fun main() {
    render("#target") { // using id selector here, leave blank to use document.body by default
        h1 { +"My App" }
        div("some-fix-css-class") {
            p(id = "someId") {
                +"Hello World!"
            }
        }
    }
}

running example in browser

When calling render like that, your content will be mounted to an HTMLElement with id="target". If you want to mount your content to the body of your index.html, you can omit this parameter. Instead of using the selector string with the querySelector syntax, you can also specify an HTMLElement directly on the targetElement parameter. Setting the override parameter to false means that your content will be appended. By default, all child elements will be removed before your content is appended to the targetElement.

Run the project by calling ./gradlew jsRun in your project's main directory. Add -t to enable automatic building and reloading in the browser after changing your code.

Pre-release builds

If you want to use the newest snapshot-builds of fritz2 before we release them add the following lines to your build.gradle.kts:

repositories {
    mavenCentral()
    maven("https://s01.oss.sonatype.org/content/repositories/snapshots/") // new repository here
}

val fritz2Version = "1.0-SNAPSHOT" // set the newer snapshot version here

If you find any problems with these snapshot-versions please open an issue.