Version 1.2.3-SNAPSHOT

- Fix attr vs property checkbox update

.gitignore

@@ -4,3 +4,8 @@ build
 web/js/generated
 gradle.properties
 local.properties
+*.iml
+*.ipr
+*.iws
+kotlin-js-store
+.idea

build.gradle.kts

@@ -1,79 +1,175 @@
-
 plugins {
-    kotlin("multiplatform") version "1.5.21"
-    `maven-publish`
+  kotlin("multiplatform") version "1.9.23"
+  id("maven-publish")
+  id("signing")
+  id("org.jetbrains.dokka") version "1.5.31"
 }
 
 group = "nl.astraeus"
-version = "0.5.7-SNAPSHOT"
+version = "1.2.3-SNAPSHOT"
 
 repositories {
-    mavenCentral()
+  mavenCentral()
 }
 
 kotlin {
-    js(BOTH) {
-        browser {
-            testTask {
-                useKarma {
-                    useChromiumHeadless()
-                    //useChromeHeadless()
-                }
-            }
+  js(IR) {
+    browser {
+      testTask {
+        useKarma {
+          useChromiumHeadless()
         }
+      }
     }
+  }
+  /*
+  @OptIn(ExperimentalWasmDsl::class)
+  wasmJs {
+    //moduleName = project.name
+    browser()
 
-    sourceSets {
-        val commonMain by getting {
-            dependencies {
-                implementation(kotlin("stdlib-common"))
-
-                api("org.jetbrains.kotlinx:kotlinx-html-js:0.7.3")
-            }
-        }
-        val jsMain by getting {
-            dependencies {
-                implementation(kotlin("stdlib-js"))
-            }
-        }
-        val jsTest by getting {
-            dependencies {
-                implementation(kotlin("test-js"))
-            }
-        }
+    mavenPublication {
+      groupId = group as String
+      pom { name = "${project.name}-wasm-js" }
     }
+  }
+
+  @OptIn(ExperimentalKotlinGradlePluginApi::class)
+  applyDefaultHierarchyTemplate {
+    common {
+      group("jsCommon") {
+        withJs()
+        // TODO: switch to `withWasmJs()` after upgrade to Kotlin 2.0
+        withWasm()
+      }
+    }
+  }
+  */
+
+  sourceSets {
+    val commonMain by getting {
+      dependencies {
+        api("org.jetbrains.kotlinx:kotlinx-html:0.11.0")
+      }
+    }
+    val jsMain by getting
+    val jsTest by getting {
+      dependencies {
+        implementation(kotlin("test-js"))
+      }
+    }
+  }
+}
+
+extra["PUBLISH_GROUP_ID"] = group
+extra["PUBLISH_VERSION"] = version
+extra["PUBLISH_ARTIFACT_ID"] = name
+
+// Stub secrets to let the project sync and build without the publication values set up
+val signingKeyId: String? by project
+val signingPassword: String? by project
+val signingSecretKeyRingFile: String? by project
+val ossrhUsername: String? by project
+val ossrhPassword: String? by project
+
+extra["signing.keyId"] = signingKeyId
+extra["signing.password"] = signingPassword
+extra["signing.secretKeyRingFile"] = signingSecretKeyRingFile
+extra["ossrhUsername"] = ossrhUsername
+extra["ossrhPassword"] = ossrhPassword
+
+val javadocJar by tasks.registering(Jar::class) {
+  archiveClassifier.set("javadoc")
 }
 
 publishing {
-    repositories {
-        if (project.properties["nexusUsername"] != null) {
-            maven {
-                name = "releases"
-                url = uri("https://nexus.astraeus.nl/nexus/content/repositories/releases")
-                credentials {
-                    val nexusUsername: String by project
-                    val nexusPassword: String by project
+  repositories {
+    mavenLocal()
+    maven {
+      name = "releases"
+      // change to point to your repo, e.g. http://my.org/repo
+      setUrl("https://reposilite.astraeus.nl/releases")
+      credentials {
+        val reposiliteUsername: String? by project
+        val reposilitePassword: String? by project
 
-                    username = nexusUsername
-                    password = nexusPassword
-                }
-            }
-            maven {
-                name = "snapshots"
-                url = uri("https://nexus.astraeus.nl/nexus/content/repositories/snapshots")
-                credentials {
-                    val nexusUsername: String by project
-                    val nexusPassword: String by project
+        username = reposiliteUsername
+        password = reposilitePassword
+      }
+    }
+    maven {
+      name = "snapshots"
+      // change to point to your repo, e.g. http://my.org/repo
+      setUrl("https://reposilite.astraeus.nl/snapshots")
+      credentials {
+        val reposiliteUsername: String? by project
+        val reposilitePassword: String? by project
 
-                    username = nexusUsername
-                    password = nexusPassword
-                }
-            }
-        } else {
-            println("Publishing disabled properties not found.")
+        username = reposiliteUsername
+        password = reposilitePassword
+      }
+    }
+    maven {
+      name = "sonatype"
+      setUrl("https://s01.oss.sonatype.org/service/local/staging/deploy/maven2")
+      credentials {
+        username = ossrhUsername
+        password = ossrhPassword
+      }
+    }
+  }
+
+  // Configure all publications
+  publications.withType<MavenPublication> {
+    // Stub javadoc.jar artifact
+    artifact(javadocJar.get())
+
+    // Provide artifacts information requited by Maven Central
+    pom {
+      name.set("kotlin-komponent")
+      description.set("Kotlin komponent")
+      url.set("https://github.com/rnentjes/komponent")
+
+      licenses {
+        license {
+          name.set("MIT")
+          url.set("https://opensource.org/licenses/MIT")
         }
+      }
+      developers {
+        developer {
+          id.set("rnentjes")
+          name.set("Rien Nentjes")
+          email.set("info@nentjes.com")
+        }
+      }
+      scm {
+        url.set("https://github.com/rnentjes/komponent")
+      }
     }
-    publications {
-        val kotlinMultiplatform by getting {}
-    }
+  }
+}
+
+signing {
+  sign(publishing.publications)
+}
+
+tasks.named<Task>("signJsPublication") {
+  dependsOn(tasks.named<Task>("publishKotlinMultiplatformPublicationToMavenLocal"))
+}
+
+tasks.named<Task>("publishJsPublicationToReleasesRepository") {
+  dependsOn(tasks.named<Task>("signKotlinMultiplatformPublication"))
+}
+
+tasks.named<Task>("publishKotlinMultiplatformPublicationToMavenLocalRepository") {
+  dependsOn(tasks.named<Task>("signJsPublication"))
+}
+
+tasks.named<Task>("publishKotlinMultiplatformPublicationToReleasesRepository") {
+  dependsOn(tasks.named<Task>("signJsPublication"))
+}
+
+tasks.named<Task>("publishKotlinMultiplatformPublicationToSonatypeRepository") {
+  dependsOn(tasks.named<Task>("signJsPublication"))
 }

docs/getting-started.md

@@ -0,0 +1,147 @@
+# Table of contents
+
+* [Home](home.md)
+* [Getting started](getting-started.md)
+* [How it works](how-it-works.md)
+
+# Getting started
+
+To get started create a new kotlin project in intellij of the type 'Browser application'
+
+![Create 'Browser Application' project](/docs/img/create-project.png)
+
+Add the 'sourceSets' block with the kotlin-komponent dependency so your build.gradle.kts looks like this:
+
+```gradle
+plugins {
+    kotlin("js") version "1.6.10"
+}
+
+group = "com.test"
+version = "1.0.0-SNAPSHOT"
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    api("nl.astraeus:kotlin-komponent-js:1.0.0")
+
+    testImplementation(kotlin("test"))
+}
+
+kotlin {
+    js(IR) {
+        binaries.executable()
+        browser {
+            commonWebpackConfig {
+                cssSupport.enabled = true
+            }
+        }
+    }
+}
+```
+
+Refresh the gradle project to import the dependency.
+
+There is now only one kotlin source file in the project called Simple.kt, it should look something like this:
+
+```kotin
+fun main() {
+  console.log("Hello, ${greet()}")
+}
+
+fun greet() = "world"
+```
+
+Replace the code in the file with the following for a simple click app:
+
+```kotlin
+import kotlinx.browser.document
+import kotlinx.html.button
+import kotlinx.html.div
+import kotlinx.html.hr
+import kotlinx.html.js.onClickFunction
+import nl.astraeus.komp.HtmlBuilder
+import nl.astraeus.komp.Komponent
+import nl.astraeus.komp.mutableCollectionState
+import nl.astraeus.komp.state
+import kotlin.js.Date
+
+fun main() {
+  console.log("Hello, ${greet()}")
+
+  Komponent.create(document.body!!, TestKomponent())
+}
+
+fun greet() = "world"
+
+class TestKomponent : Komponent() {
+  var clicks: Int = 0
+  val lines: MutableCollection<String> = mutableListOf()
+
+  override fun HtmlBuilder.render() {
+    div {
+      div {
+        +"Hello Komponent!"
+      }
+
+      div {
+        +"Clicks $clicks"
+      }
+
+      div {
+        button {
+          +"Click"
+          onClickFunction = {
+            clicks++
+            lines.add("click $clicks at ${Date()}")
+            requestUpdate()
+          }
+        }
+      }
+
+      hr()
+
+      for (line in lines) {
+        div {
+          + line
+        }
+      }
+
+    }
+  }
+}
+```
+
+First in the main we add our TestKomponent to the document body with the following line:
+
+```kotlin
+  Komponent.create(document.body!!, TestKomponent())
+```
+
+The TestKomponent.render method will be called to render our Komponent. 
+As you can see events can be attached inline with the on<event>Function methods.
+The requestUpdate method will call the render method again and update the page accordingly.
+
+After building the application you will find it in /build/distributions.
+
+In the index.html page you will find the following line:
+
+```html
+<div id="root"></div>
+```
+
+This line is not needed for kotlin-komponent.
+
+If you like you can use some helpers that will automatically call the requestUpdate method if
+the data changes, that would look like this:
+
+```kotlin
+  var clicks: Int by state(0)
+  val lines: MutableCollection<String> = mutableCollectionState(mutableListOf())
+```
+
+In that case you can remove the requestUpdate call from the onClickFunction.
+
+You can find a working repository of this example here: [kotlin-komponent-start](https://github.com/rnentjes/kotlin-komponent-start)

docs/home.md

@@ -0,0 +1,6 @@
+# Table of contents
+
+* [Home](home.md)
+* [Getting started](getting-started.md)
+* [How it works](how-it-works.md)
+

docs/how-it-works.md

@@ -0,0 +1,23 @@
+# Table of contents
+
+* [Home](home.md)
+* [Getting started](getting-started.md)
+* [How it works](how-it-works.md)
+
+# How it works
+
+When the requestUpdate call is made to the [Komponent](src/jsMain/kotlin/nl/astraeus/komp/Komponent.kt)
+the update is queued in a callback. The callback will be called after the current event is handled.
+
+If there are multiple updates requested, these are sorted so that the top Komponents get executed first. 
+This way there will not be double updates of the same komponent.
+
+The render call will be invoked and every html builder function (div, span etc.) will call the 
+different HtmlBuilder functions like onTagStart, onTagAttributeChange etc.
+
+In these functions the HtmlBuilder will compare the dom against the call being made, and it will update the DOM
+as needed.
+
+
+
+

gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,5 @@
 #Wed Mar 04 13:29:12 CET 2020
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.4-all.zip
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStorePath=wrapper/dists

komp.commonMain.iml

@@ -1,38 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<module external.linked.project.id="komp:commonMain" external.linked.project.path="$MODULE_DIR$" external.root.project.path="$MODULE_DIR$" external.system.id="GRADLE" external.system.module.group="nl.astraeus" external.system.module.type="sourceSet" external.system.module.version="0.5.6-SNAPSHOT" type="JAVA_MODULE" version="4">
-  <component name="FacetManager">
-    <facet type="kotlin-language" name="Kotlin">
-      <configuration version="3" platform="Common (experimental) " allPlatforms="JS []/JVM [1.8]/Native []/Native [general]" useProjectSettings="false" isTestModule="false" externalProjectId="komp" pureKotlinSourceFolders="$MODULE_DIR$/src/jsMain/kotlin;/home/rnentjes/Development/komp/komp/build/externals/komp-js-legacy/src;/home/rnentjes/Development/komp/komp/build/externals/komp-js-ir/src;/home/rnentjes/Development/komp/komp/src/jsTest/kotlin">
-        <newMppModelJpsModuleKind>SOURCE_SET_HOLDER</newMppModelJpsModuleKind>
-        <compilerSettings />
-        <compilerArguments>
-          <option name="languageVersion" value="1.5" />
-          <option name="apiVersion" value="1.5" />
-          <option name="pluginOptions">
-            <array />
-          </option>
-          <option name="pluginClasspaths">
-            <array>
-              <option value="$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-scripting-jvm/1.5.21/8143908a15163e634fecb87013ed4a139170b032/kotlin-scripting-jvm-1.5.21.jar" />
-              <option value="$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-scripting-common/1.5.21/5d271f9e7e7191902f8c0d45c600f5b57a284036/kotlin-scripting-common-1.5.21.jar" />
-              <option value="$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlinx/kotlinx-coroutines-core/1.3.8/f62be6d4cbf27781c2969867b4ed952f38378492/kotlinx-coroutines-core-1.3.8.jar" />
-              <option value="$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib/1.5.21/2f537cad7e9eeb9da73738c8812e1e4cf9b62e4e/kotlin-stdlib-1.5.21.jar" />
-              <option value="$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.jetbrains/annotations/13.0/919f0dfe192fb4e063e7dacadee7f8bb9a2672a9/annotations-13.0.jar" />
-              <option value="$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib-common/1.5.21/cc8bf3586fd2ebcf234058b9440bb406e62dfacb/kotlin-stdlib-common-1.5.21.jar" />
-              <option value="$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-script-runtime/1.5.21/96d49e89873fde985750af354b6eabb60cfa999b/kotlin-script-runtime-1.5.21.jar" />
-            </array>
-          </option>
-          <option name="multiPlatform" value="true" />
-        </compilerArguments>
-      </configuration>
-    </facet>
-  </component>
-  <component name="NewModuleRootManager" inherit-compiler-output="true">
-    <exclude-output />
-    <content url="file://$MODULE_DIR$/src/commonMain" />
-    <orderEntry type="jdk" jdkName="Kotlin SDK" jdkType="KotlinSDK" />
-    <orderEntry type="sourceFolder" forTests="false" />
-    <orderEntry type="library" name="Gradle: org.jetbrains.kotlin:kotlin-stdlib-common:1.5.21" level="project" />
-    <orderEntry type="library" name="Gradle: org.jetbrains.kotlinx:kotlinx-html-common:0.7.3" level="project" />
-  </component>
-</module>

komp.commonTest.iml

@@ -1,44 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<module external.linked.project.id="komp:commonTest" external.linked.project.path="$MODULE_DIR$" external.root.project.path="$MODULE_DIR$" external.system.id="GRADLE" external.system.module.group="nl.astraeus" external.system.module.type="sourceSet" external.system.module.version="0.5.6-SNAPSHOT" type="JAVA_MODULE" version="4">
-  <component name="FacetManager">
-    <facet type="kotlin-language" name="Kotlin">
-      <configuration version="3" platform="Common (experimental) " allPlatforms="JS []/JVM [1.8]/Native []/Native [general]" useProjectSettings="false" isTestModule="true" externalProjectId="komp" pureKotlinSourceFolders="$MODULE_DIR$/src/jsMain/kotlin;/home/rnentjes/Development/komp/komp/build/externals/komp-js-legacy/src;/home/rnentjes/Development/komp/komp/build/externals/komp-js-ir/src;/home/rnentjes/Development/komp/komp/src/jsTest/kotlin">
-        <newMppModelJpsModuleKind>SOURCE_SET_HOLDER</newMppModelJpsModuleKind>
-        <externalSystemTestTasks>
-          <externalSystemTestTask>jsLegacyBrowserTest|komp:jsTest|jsLegacy</externalSystemTestTask>
-        </externalSystemTestTasks>
-        <compilerSettings />
-        <compilerArguments>
-          <option name="languageVersion" value="1.5" />
-          <option name="apiVersion" value="1.5" />
-          <option name="pluginOptions">
-            <array />
-          </option>
-          <option name="pluginClasspaths">
-            <array>
-              <option value="$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-scripting-jvm/1.5.21/8143908a15163e634fecb87013ed4a139170b032/kotlin-scripting-jvm-1.5.21.jar" />
-              <option value="$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-scripting-common/1.5.21/5d271f9e7e7191902f8c0d45c600f5b57a284036/kotlin-scripting-common-1.5.21.jar" />
-              <option value="$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlinx/kotlinx-coroutines-core/1.3.8/f62be6d4cbf27781c2969867b4ed952f38378492/kotlinx-coroutines-core-1.3.8.jar" />
-              <option value="$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib/1.5.21/2f537cad7e9eeb9da73738c8812e1e4cf9b62e4e/kotlin-stdlib-1.5.21.jar" />
-              <option value="$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.jetbrains/annotations/13.0/919f0dfe192fb4e063e7dacadee7f8bb9a2672a9/annotations-13.0.jar" />
-              <option value="$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib-common/1.5.21/cc8bf3586fd2ebcf234058b9440bb406e62dfacb/kotlin-stdlib-common-1.5.21.jar" />
-              <option value="$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-script-runtime/1.5.21/96d49e89873fde985750af354b6eabb60cfa999b/kotlin-script-runtime-1.5.21.jar" />
-            </array>
-          </option>
-          <option name="multiPlatform" value="true" />
-        </compilerArguments>
-      </configuration>
-    </facet>
-  </component>
-  <component name="NewModuleRootManager" inherit-compiler-output="true">
-    <exclude-output />
-    <content url="file://$MODULE_DIR$/src/commonTest" />
-    <orderEntry type="jdk" jdkName="Kotlin SDK" jdkType="KotlinSDK" />
-    <orderEntry type="sourceFolder" forTests="false" />
-    <orderEntry type="module" module-name="komp.commonMain" scope="TEST" />
-    <orderEntry type="library" scope="TEST" name="Gradle: org.jetbrains.kotlin:kotlin-stdlib-common:1.5.21" level="project" />
-    <orderEntry type="library" scope="TEST" name="Gradle: org.jetbrains.kotlin:kotlin-stdlib-js:1.5.21" level="project" />
-    <orderEntry type="library" scope="TEST" name="Gradle: org.jetbrains.kotlinx:kotlinx-html-common:0.7.3" level="project" />
-  </component>
-  <component name="TestModuleProperties" production-module="komp.commonMain" />
-</module>

komp.iml

@@ -1,12 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<module external.linked.project.id="komp" external.linked.project.path="$MODULE_DIR$" external.root.project.path="$MODULE_DIR$" external.system.id="GRADLE" external.system.module.group="nl.astraeus" external.system.module.version="0.5.6-SNAPSHOT" type="JAVA_MODULE" version="4">
-  <component name="NewModuleRootManager" inherit-compiler-output="true">
-    <exclude-output />
-    <content url="file://$MODULE_DIR$">
-      <excludeFolder url="file://$MODULE_DIR$/.gradle" />
-      <excludeFolder url="file://$MODULE_DIR$/build" />
-    </content>
-    <orderEntry type="inheritedJdk" />
-    <orderEntry type="sourceFolder" forTests="false" />
-  </component>
-</module>

komp.ipr

@@ -1,570 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="ArtifactManager">
-    <artifact type="jar" name="komp-0.1.16-SNAPSHOT">
-      <output-path>$PROJECT_DIR$/build/libs</output-path>
-      <root id="archive" name="komp-0.1.16-SNAPSHOT.jar">
-        <element id="module-output" name="komp_main" />
-      </root>
-    </artifact>
-    <artifact type="jar" name="komp-0.1.17-SNAPSHOT">
-      <output-path>$PROJECT_DIR$/build/libs</output-path>
-      <root id="archive" name="komp-0.1.17-SNAPSHOT.jar">
-        <element id="module-output" name="komp_main" />
-      </root>
-    </artifact>
-    <artifact type="jar" name="komp-js-0.1.21-SNAPSHOT">
-      <output-path>$PROJECT_DIR$/build/libs</output-path>
-      <root id="archive" name="komp-js-0.1.21-SNAPSHOT.jar">
-        <element id="module-output" name="komp.jsMain" />
-      </root>
-    </artifact>
-    <artifact type="jar" name="komp-js-0.2.1-SNAPSHOT">
-      <output-path>$PROJECT_DIR$/build/libs</output-path>
-      <root id="archive" name="komp-js-0.2.1-SNAPSHOT.jar">
-        <element id="module-output" name="komp.jsMain" />
-      </root>
-    </artifact>
-    <artifact type="jar" name="komp-js-0.2.2-SNAPSHOT">
-      <output-path>$PROJECT_DIR$/build/libs</output-path>
-      <root id="archive" name="komp-js-0.2.2-SNAPSHOT.jar">
-        <element id="module-output" name="komp.jsMain" />
-      </root>
-    </artifact>
-    <artifact type="jar" name="komp-jslegacy-0.2.2-SNAPSHOT">
-      <output-path>$PROJECT_DIR$/build/libs</output-path>
-      <root id="archive" name="komp-jslegacy-0.2.2-SNAPSHOT.jar">
-        <element id="module-output" name="komp.jsMain" />
-      </root>
-    </artifact>
-    <artifact type="jar" name="komp-jslegacy-0.2.3-SNAPSHOT">
-      <output-path>$PROJECT_DIR$/build/libs</output-path>
-      <root id="archive" name="komp-jslegacy-0.2.3-SNAPSHOT.jar">
-        <element id="module-output" name="komp.jsMain" />
-      </root>
-    </artifact>
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-      <option name="WIDTH" value="400" />
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-    </library>
-    <library name="Gradle: org.jetbrains.kotlinx:kotlinx-html-js:0.7.3" type="kotlin.js">
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-        <root url="jar://$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlinx/kotlinx-html-js/0.7.3/93a1ab4269d3a567e05088d1237eedbc2efd03c9/kotlinx-html-jslegacy-0.7.3.jar!/" />
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-  </component>
-  <component name="masterDetails">
-    <states>
-      <state key="ProjectJDKs.UI">
-        <settings>
-          <last-edited>1.7</last-edited>
-          <splitter-proportions>
-            <option name="proportions">
-              <list>
-                <option value="0.2" />
-              </list>
-            </option>
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-        </settings>
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-    </states>
-  </component>
-</project>

komp.jsMain.iml

@@ -1,59 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<module external.linked.project.id="komp:jsMain" external.linked.project.path="$MODULE_DIR$" external.root.project.path="$MODULE_DIR$" external.system.id="GRADLE" external.system.module.group="nl.astraeus" external.system.module.type="sourceSet" external.system.module.version="0.5.6-SNAPSHOT" type="JAVA_MODULE" version="4">
-  <component name="FacetManager">
-    <facet type="kotlin-language" name="Kotlin">
-      <configuration version="3" platform="JavaScript " allPlatforms="JS []" useProjectSettings="false" isTestModule="false" externalProjectId="komp" pureKotlinSourceFolders="$MODULE_DIR$/src/jsMain/kotlin;/home/rnentjes/Development/komp/komp/build/externals/komp-js-legacy/src;/home/rnentjes/Development/komp/komp/build/externals/komp-js-ir/src;/home/rnentjes/Development/komp/komp/src/jsTest/kotlin">
-        <dependsOnModuleNames>komp:commonMain</dependsOnModuleNames>
-        <sourceSets>
-          <sourceSet>komp.commonMain</sourceSet>
-        </sourceSets>
-        <newMppModelJpsModuleKind>COMPILATION_AND_SOURCE_SET_HOLDER</newMppModelJpsModuleKind>
-        <compilerSettings />
-        <compilerArguments>
-          <option name="outputFile" value="$MODULE_DIR$/build/js/packages/komp-js-legacy/kotlin/komp-js-legacy.js" />
-          <option name="noStdlib" value="true" />
-          <option name="sourceMap" value="true" />
-          <option name="metaInfo" value="true" />
-          <option name="target" value="v5" />
-          <option name="moduleKind" value="umd" />
-          <option name="main" value="call" />
-          <option name="languageVersion" value="1.5" />
-          <option name="apiVersion" value="1.5" />
-          <option name="pluginOptions">
-            <array />
-          </option>
-          <option name="pluginClasspaths">
-            <array>
-              <option value="$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-script-runtime/1.5.21/96d49e89873fde985750af354b6eabb60cfa999b/kotlin-script-runtime-1.5.21.jar" />
-              <option value="$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-scripting-common/1.5.21/5d271f9e7e7191902f8c0d45c600f5b57a284036/kotlin-scripting-common-1.5.21.jar" />
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-          </option>
-        </compilerArguments>
-      </configuration>
-    </facet>
-  </component>
-  <component name="NewModuleRootManager">
-    <output url="file://$MODULE_DIR$/build/js/packages/komp-js-legacy/kotlin" />
-    <exclude-output />
-    <content url="file://$MODULE_DIR$/build/externals/komp-js-ir/src" />
-    <content url="file://$MODULE_DIR$/build/externals/komp-js-legacy/src" />
-    <content url="file://$MODULE_DIR$/src/jsMain">
-      <sourceFolder url="file://$MODULE_DIR$/src/jsMain/kotlin" type="kotlin-source" />
-    </content>
-    <orderEntry type="jdk" jdkName="Kotlin SDK" jdkType="KotlinSDK" />
-    <orderEntry type="sourceFolder" forTests="false" />
-    <orderEntry type="module" module-name="komp.commonMain" />
-    <orderEntry type="library" name="Gradle: org.jetbrains.kotlinx:kotlinx-html-js:0.7.3" level="project" />
-    <orderEntry type="library" name="Gradle: org.jetbrains.kotlin:kotlin-stdlib-js:1.5.21" level="project" />
-    <orderEntry type="library" name="Gradle: org.jetbrains.kotlin:kotlin-stdlib-common:1.5.21" level="project" />
-  </component>
-</module>

komp.jsTest.iml

@@ -1,86 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<module external.linked.project.id="komp:jsTest" external.linked.project.path="$MODULE_DIR$" external.root.project.path="$MODULE_DIR$" external.system.id="GRADLE" external.system.module.group="nl.astraeus" external.system.module.type="sourceSet" external.system.module.version="0.5.6-SNAPSHOT" type="JAVA_MODULE" version="4">
-  <component name="FacetManager">
-    <facet type="kotlin-language" name="Kotlin">
-      <configuration version="3" platform="JavaScript " allPlatforms="JS []" useProjectSettings="false" isTestModule="true" externalProjectId="komp" pureKotlinSourceFolders="$MODULE_DIR$/src/jsMain/kotlin;/home/rnentjes/Development/komp/komp/build/externals/komp-js-legacy/src;/home/rnentjes/Development/komp/komp/build/externals/komp-js-ir/src;/home/rnentjes/Development/komp/komp/src/jsTest/kotlin">
-        <dependsOnModuleNames>komp:commonTest</dependsOnModuleNames>
-        <sourceSets>
-          <sourceSet>komp.commonTest</sourceSet>
-          <sourceSet>komp.jsMain</sourceSet>
-          <sourceSet>komp.commonMain</sourceSet>
-        </sourceSets>
-        <newMppModelJpsModuleKind>COMPILATION_AND_SOURCE_SET_HOLDER</newMppModelJpsModuleKind>
-        <externalSystemTestTasks>
-          <externalSystemTestTask>jsLegacyBrowserTest|komp:jsTest|jsLegacy</externalSystemTestTask>
-        </externalSystemTestTasks>
-        <compilerSettings />
-        <compilerArguments>
-          <option name="outputFile" value="$MODULE_DIR$/build/js/packages/komp-js-legacy-test/kotlin/komp-js-legacy-test.js" />
-          <option name="noStdlib" value="true" />
-          <option name="sourceMap" value="true" />
-          <option name="metaInfo" value="true" />
-          <option name="target" value="v5" />
-          <option name="moduleKind" value="umd" />
-          <option name="main" value="call" />
-          <option name="languageVersion" value="1.5" />
-          <option name="apiVersion" value="1.5" />
-          <option name="pluginOptions">
-            <array />
-          </option>
-          <option name="pluginClasspaths">
-            <array>
-              <option value="$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-script-runtime/1.5.21/96d49e89873fde985750af354b6eabb60cfa999b/kotlin-script-runtime-1.5.21.jar" />
-              <option value="$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-scripting-common/1.5.21/5d271f9e7e7191902f8c0d45c600f5b57a284036/kotlin-scripting-common-1.5.21.jar" />
-              <option value="$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-scripting-jvm/1.5.21/8143908a15163e634fecb87013ed4a139170b032/kotlin-scripting-jvm-1.5.21.jar" />
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-            </array>
-          </option>
-          <option name="multiPlatform" value="true" />
-          <option name="errors">
-            <ArgumentParseErrors />
-          </option>
-        </compilerArguments>
-      </configuration>
-    </facet>
-  </component>
-  <component name="NewModuleRootManager">
-    <output-test url="file://$MODULE_DIR$/build/js/packages/komp-js-legacy-test/kotlin" />
-    <exclude-output />
-    <content url="file://$MODULE_DIR$/src/jsTest">
-      <sourceFolder url="file://$MODULE_DIR$/src/jsTest/kotlin" type="kotlin-test" />
-    </content>
-    <orderEntry type="jdk" jdkName="Kotlin SDK" jdkType="KotlinSDK" />
-    <orderEntry type="sourceFolder" forTests="false" />
-    <orderEntry type="module" module-name="komp.commonMain" scope="TEST" />
-    <orderEntry type="module" module-name="komp.commonTest" scope="TEST" production-on-test="" />
-    <orderEntry type="module" module-name="komp.jsMain" scope="TEST" />
-    <orderEntry type="module" module-name="komp.jsMain" scope="RUNTIME" />
-    <orderEntry type="module-library" scope="PROVIDED">
-      <library name="Gradle: nl.astraeus:komp">
-        <CLASSES>
-          <root url="file://$MODULE_DIR$/build/classes/kotlin/jsIr/main" />
-        </CLASSES>
-        <JAVADOC />
-        <SOURCES />
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-    </orderEntry>
-    <orderEntry type="module-library" scope="RUNTIME">
-      <library>
-        <CLASSES>
-          <root url="file://$MODULE_DIR$/build/processedResources/jsIr/main" />
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-        <JAVADOC />
-        <SOURCES />
-      </library>
-    </orderEntry>
-    <orderEntry type="library" scope="TEST" name="Gradle: org.jetbrains.kotlinx:kotlinx-html-js:0.7.3" level="project" />
-    <orderEntry type="library" scope="TEST" name="Gradle: org.jetbrains.kotlin:kotlin-test-js:1.5.21" level="project" />
-    <orderEntry type="library" scope="TEST" name="Gradle: org.jetbrains.kotlinx:kotlinx-html-common:0.7.3" level="project" />
-    <orderEntry type="library" scope="TEST" name="Gradle: org.jetbrains.kotlin:kotlin-stdlib-js:1.5.21" level="project" />
-    <orderEntry type="library" scope="TEST" name="Gradle: org.jetbrains.kotlin:kotlin-stdlib-common:1.5.21" level="project" />
-  </component>
-  <component name="TestModuleProperties" production-module="komp.jsMain" />
-</module>

readme.md

@@ -1,7 +1,13 @@
 # Komponent
 
+![Gradle CI](https://github.com/rnentjes/komponent/workflows/Gradle%20CI/badge.svg)
+
 Very simple helper to build single page apps with the Kotlin javascript target using static html builders.
 
 See the komp-todo repository for a basic example here: [komp-todo](https://github.com/rnentjes/komp-todo)
 
 For a more complete example take a look at the simple-password-manager repository: [simple-password-manager](https://github.com/rnentjes/simple-password-manager)
+
+Available on maven central: "nl.astraeus:kotlin-komponent-js:1.0.0"
+
+Some getting started documentation can be found [here](docs/getting-started.md)

settings.gradle.kts

@@ -1,14 +1,2 @@
-pluginManagement {
-    repositories {
 
-        maven { setUrl("https://dl.bintray.com/kotlin/kotlin-dev") }
-
-        maven { setUrl("https://dl.bintray.com/kotlin/kotlin-eap") }
-
-        mavenCentral()
-
-        maven { setUrl("https://plugins.gradle.org/m2/") }
-    }
-}
-
-rootProject.name = "komp"
+rootProject.name = "kotlin-komponent"

src/jsMain/kotlin/nl/astraeus/komp/ElementExtentions.kt

@@ -0,0 +1,158 @@
+package nl.astraeus.komp
+
+import org.w3c.dom.events.Event
+import org.w3c.dom.Element
+import org.w3c.dom.HTMLInputElement
+import org.w3c.dom.events.EventListener
+import org.w3c.dom.get
+
+private fun Int.asSpaces(): String {
+  val result = StringBuilder()
+
+  repeat(this) {
+    result.append(" ")
+  }
+  return result.toString()
+}
+
+fun Element.printTree(indent: Int = 0): String {
+  val result = StringBuilder()
+
+  result.append(indent.asSpaces())
+  result.append(tagName)
+  if (this.namespaceURI != "http://www.w3.org/1999/xhtml") {
+    result.append(" [")
+    result.append(namespaceURI)
+    result.append("]")
+  }
+  result.append(" (")
+  var first = true
+  if (hasAttributes()) {
+    for (index in 0 until attributes.length) {
+      if (!first) {
+        result.append(", ")
+      } else {
+        first = false
+      }
+      result.append(attributes[index]?.localName)
+      result.append("=")
+      result.append(attributes[index]?.value)
+    }
+  }
+  result.append(") {")
+  result.append("\n")
+  for ((name, event) in getKompEvents()) {
+    result.append(indent.asSpaces())
+    result.append("on")
+    result.append(name)
+    result.append(" -> ")
+    result.append(event)
+    result.append("\n")
+  }
+  for (index in 0 until childNodes.length) {
+    childNodes[index]?.let {
+      if (it is Element) {
+        result.append(it.printTree(indent + 2))
+      } else {
+        result.append((indent + 2).asSpaces())
+        result.append(it.textContent)
+        result.append("\n")
+      }
+    }
+  }
+  result.append(indent.asSpaces())
+  result.append("}\n")
+
+  return result.toString()
+}
+
+internal fun Element.setKompAttribute(attributeName: String, value: String?) {
+  //val attributeName = name.lowercase()
+  if (value == null || value.isBlank()) {
+    if (this is HTMLInputElement) {
+      when (attributeName) {
+        "checked" -> {
+          checked = false
+        }
+/*
+        "class" -> {
+          className = ""
+        }
+*/
+        "value" -> {
+          this.value = ""
+        }
+        else -> {
+          removeAttribute(attributeName)
+        }
+      }
+    } else {
+      removeAttribute(attributeName)
+    }
+  } else {
+    if (this is HTMLInputElement) {
+      when (attributeName) {
+        "checked" -> {
+          checked = "checked" == value
+        }
+/*
+        "class" -> {
+          className = value
+        }
+*/
+        "value" -> {
+          this.value = value
+        }
+        else -> {
+          setAttribute(attributeName, value)
+        }
+      }
+    } else if (this.getAttribute(attributeName) != value) {
+      setAttribute(attributeName, value)
+    }
+  }
+}
+
+internal fun Element.clearKompEvents() {
+  val events = getKompEvents()
+  for ((name, event) in getKompEvents()) {
+    removeEventListener(name, event)
+  }
+  events.clear()
+}
+
+internal fun Element.setKompEvent(name: String, event: (Event) -> Unit) {
+  val eventName: String = if (name.startsWith("on")) {
+    name.substring(2)
+  } else {
+    name
+  }
+
+  getKompEvents()[eventName] = event
+
+  this.addEventListener(eventName, event)
+}
+
+internal fun Element.getKompEvents(): MutableMap<String, (Event) -> Unit> {
+  var result: MutableMap<String, (Event) -> Unit>? = this.asDynamic()["komp-events"] as MutableMap<String, (Event) -> Unit>?
+
+  if (result == null) {
+    result = mutableMapOf()
+    this.asDynamic()["komp-events"] = result
+  }
+
+  return result
+}
+
+internal fun Element.findElementIndex(): Int {
+  val childNodes = parentElement?.children
+  if (childNodes != null) {
+    for (index in 0 until childNodes.length) {
+      if (childNodes[index] == this) {
+        return index
+      }
+    }
+  }
+
+  return 0
+}

src/jsMain/kotlin/nl/astraeus/komp/ElementIndex.kt

@@ -0,0 +1,64 @@
+package nl.astraeus.komp
+
+import org.w3c.dom.Node
+import org.w3c.dom.get
+
+data class ElementIndex(
+  val parent: Node,
+  var childIndex: Int,
+  var setAttr: MutableSet<String> = mutableSetOf()
+) {
+  override fun toString(): String {
+    return "${parent.nodeName}[$childIndex]"
+  }
+}
+
+fun ArrayList<ElementIndex>.currentParent(): Node {
+  this.lastOrNull()?.let {
+    return it.parent
+  }
+
+  throw IllegalStateException("currentParent should never be null!")
+}
+
+fun ArrayList<ElementIndex>.currentElement(): Node? {
+  this.lastOrNull()?.let {
+    return it.parent.childNodes[it.childIndex]
+  }
+
+  return null
+}
+
+fun ArrayList<ElementIndex>.currentPosition(): ElementIndex? {
+  return if (this.size < 2) {
+    null
+  } else {
+    this[this.size - 2]
+  }
+}
+
+fun ArrayList<ElementIndex>.nextElement() {
+  this.lastOrNull()?.let {
+    it.setAttr.clear()
+    it.childIndex++
+  }
+}
+
+fun ArrayList<ElementIndex>.pop() {
+  this.removeLast()
+}
+
+fun ArrayList<ElementIndex>.push(element: Node) {
+  this.add(ElementIndex(element, 0))
+}
+
+fun ArrayList<ElementIndex>.replace(new: Node) {
+  if (this.currentElement() != null) {
+    this.currentElement()?.parentElement?.replaceChild(
+      new,
+      this.currentElement()!!
+    )
+  } else {
+    this.last().parent.appendChild(new)
+  }
+}

src/jsMain/kotlin/nl/astraeus/komp/HtmlBuilder.kt

@@ -13,7 +13,6 @@ import org.w3c.dom.HTMLInputElement
 import org.w3c.dom.HTMLSpanElement
 import org.w3c.dom.Node
 import org.w3c.dom.asList
-import org.w3c.dom.events.Event
 import org.w3c.dom.get
 
 private var currentElement: Element? = null
@@ -24,209 +23,22 @@ interface HtmlConsumer : TagConsumer<Element> {
   fun debug(block: HtmlConsumer.() -> Unit)
 }
 
-fun Int.asSpaces(): String {
-  val result = StringBuilder()
-  repeat(this) {
-    result.append(" ")
-  }
-  return result.toString()
-}
-
 fun FlowOrMetaDataOrPhrasingContent.currentElement(): Element =
   currentElement ?: error("No current element defined!")
 
-fun Element.printTree(indent: Int = 0): String {
-  val result = StringBuilder()
-
-  result.append(indent.asSpaces())
-  result.append(tagName)
-  if (this.namespaceURI != "http://www.w3.org/1999/xhtml") {
-    result.append(" [")
-    result.append(namespaceURI)
-    result.append("]")
-  }
-  result.append(" (")
-  var first = true
-  if (hasAttributes()) {
-    for (index in 0 until attributes.length) {
-      if (!first) {
-        result.append(", ")
-      } else {
-        first = false
-      }
-      result.append(attributes[index]?.localName)
-      result.append("=")
-      result.append(attributes[index]?.value)
-    }
-  }
-  result.append(") {")
-  result.append("\n")
-  for ((name, event) in getKompEvents()) {
-    result.append(indent.asSpaces())
-    result.append("on")
-    result.append(name)
-    result.append(" -> ")
-    result.append(event)
-    result.append("\n")
-  }
-  for (index in 0 until childNodes.length) {
-    childNodes[index]?.let {
-      if (it is Element) {
-        result.append(it.printTree(indent + 2))
-      } else {
-        result.append((indent + 2).asSpaces())
-        result.append(it.textContent)
-        result.append("\n")
-      }
-    }
-  }
-  result.append(indent.asSpaces())
-  result.append("}\n")
-
-  return result.toString()
-}
-
-private fun Element.clearKompAttributes() {
-  val attributes = this.asDynamic()["komp-attributes"] as MutableSet<String>?
-
-  if (attributes == null) {
-    this.asDynamic()["komp-attributes"] = mutableSetOf<String>()
-  } else {
-    attributes.clear()
-  }
-
-  if (this is HTMLInputElement) {
-    this.checked = false
-  }
-}
-
-private fun Element.getKompAttributes(): MutableSet<String> {
-  var result: MutableSet<String>? = this.asDynamic()["komp-attributes"] as MutableSet<String>?
-
-  if (result == null) {
-    result = mutableSetOf()
-
-    this.asDynamic()["komp-attributes"] = result
-  }
-
-  return result
-}
-
-private fun Element.setKompAttribute(name: String, value: String) {
-  val setAttrs: MutableSet<String> = getKompAttributes()
-  setAttrs.add(name)
-
-  if (this is HTMLInputElement) {
-    when (name) {
-      "checked" -> {
-        this.checked = value == "checked"
-      }
-      "value" -> {
-        this.value = value
-
-      }
-      else -> {
-        setAttribute(name, value)
-      }
-    }
-  } else if (this.getAttribute(name) != value) {
-    setAttribute(name, value)
-  }
-}
-
-private fun Element.clearKompEvents() {
-  for ((name, event) in getKompEvents()) {
-    currentElement?.removeEventListener(name, event)
-  }
-
-  val events = this.asDynamic()["komp-events"] as MutableMap<String, (Event) -> Unit>?
-
-  if (events == null) {
-    this.asDynamic()["komp-events"] = mutableMapOf<String, (Event) -> Unit>()
-  } else {
-    events.clear()
-  }
-}
-
-private fun Element.setKompEvent(name: String, event: (Event) -> Unit) {
-  val eventName: String = if (name.startsWith("on")) {
-    name.substring(2)
-  } else {
-    name
-  }
-
-  val events: MutableMap<String, (Event) -> Unit> = getKompEvents()
-
-  events[eventName]?.let {
-    println("Warn event already defined!")
-    currentElement?.removeEventListener(eventName, it)
-  }
-
-  events[eventName] = event
-
-  this.asDynamic()["komp-events"] = events
-
-  this.addEventListener(eventName, event)
-}
-
-private fun Element.getKompEvents(): MutableMap<String, (Event) -> Unit> {
-  return this.asDynamic()["komp-events"] ?: mutableMapOf()
-}
-
-private data class ElementIndex(
-  val parent: Node,
-  var childIndex: Int
-)
-
-private fun ArrayList<ElementIndex>.currentParent(): Node {
-  this.lastOrNull()?.let {
-    return it.parent
-  }
-
-  throw IllegalStateException("currentParent should never be null!")
-}
-
-private fun ArrayList<ElementIndex>.currentElement(): Node? {
-  this.lastOrNull()?.let {
-    return it.parent.childNodes[it.childIndex]
-  }
-
-  return null
-}
-
-private fun ArrayList<ElementIndex>.nextElement() {
-  this.lastOrNull()?.let {
-    it.childIndex++
-  }
-}
-
-private fun ArrayList<ElementIndex>.pop() {
-  this.removeLast()
-}
-
-private fun ArrayList<ElementIndex>.push(element: Node) {
-  this.add(ElementIndex(element, 0))
-}
-
-private fun ArrayList<ElementIndex>.replace(new: Node) {
-  if (this.currentElement() != null) {
-    this.currentElement()?.parentElement?.replaceChild(new, this.currentElement()!!)
-  } else {
-    this.last().parent.appendChild(new)
-  }
-}
-
 private fun Node.asElement() = this as? HTMLElement
 
 class HtmlBuilder(
-  val parent: Element,
-  var childIndex: Int = 0
+  private val komponent: Komponent?,
+  parent: Element,
+  childIndex: Int = 0
 ) : HtmlConsumer {
   private var currentPosition = arrayListOf<ElementIndex>()
   private var inDebug = false
-  var currentNode: Node? = null
+  private var exceptionThrown = false
+  private var currentNode: Node? = null
+  private var firstTag: Boolean = true
   var root: Element? = null
-  val currentAttributes: MutableMap<String, String> = mutableMapOf()
 
   init {
     currentPosition.add(ElementIndex(parent, childIndex))
@@ -239,9 +51,18 @@ class HtmlBuilder(
     ) {
       currentPosition.replace(komponent.element!!)
       if (Komponent.logRenderEvent) {
-        console.log("Skipped include $komponent, memoize hasn't changed")
+        console.log(
+          "Skipped include $komponent, memoize hasn't changed"
+        )
       }
     } else {
+      // current element should become parent
+/*
+      val ce = komponent.element
+      if (ce != null) {
+        append(ce as Element)
+      }
+*/
       komponent.create(
         currentPosition.last().parent as Element,
         currentPosition.last().childIndex
@@ -256,34 +77,40 @@ class HtmlBuilder(
   }
 
   override fun debug(block: HtmlConsumer.() -> Unit) {
+    val enableAssertions = Komponent.enableAssertions
+    Komponent.enableAssertions = true
     inDebug = true
 
     try {
       block.invoke(this)
     } finally {
       inDebug = false
+      Komponent.enableAssertions = enableAssertions
     }
   }
 
-  fun logReplace(msg: String) {
+  private fun logReplace(msg: () -> String) {
     if (Komponent.logReplaceEvent && inDebug) {
-      console.log(msg)
+      console.log(msg.invoke())
     }
   }
 
   override fun onTagStart(tag: Tag) {
-    //logReplace"onTagStart, [${tag.tagName}, ${tag.namespace}], currentPosition: $currentPosition")
+    logReplace {
+      "onTagStart, [${tag.tagName}, ${tag.namespace ?: ""}], currentPosition: $currentPosition"
+    }
+
     currentNode = currentPosition.currentElement()
 
     if (currentNode == null) {
-      //logReplace"onTagStart, currentNode1: $currentNode")
+      logReplace { "onTagStart, currentNode1: $currentNode" }
       currentNode = if (tag.namespace != null) {
         document.createElementNS(tag.namespace, tag.tagName)
       } else {
         document.createElement(tag.tagName)
       }
 
-      //logReplace"onTagStart, currentElement1.1: $currentNode")
+      logReplace { "onTagStart, currentElement1.1: $currentNode" }
       currentPosition.currentParent().appendChild(currentNode!!)
     } else if (
       !currentNode?.asElement()?.tagName.equals(tag.tagName, true) ||
@@ -292,8 +119,13 @@ class HtmlBuilder(
               !currentNode?.asElement()?.namespaceURI.equals(tag.namespace, true)
           )
     ) {
-      //logReplace"onTagStart, currentElement, namespace: ${currentNode?.asElement()?.namespaceURI} -> ${tag.namespace}")
-      //logReplace"onTagStart, currentElement, replace: ${currentNode?.asElement()?.tagName} -> ${tag.tagName}")
+      logReplace {
+        "onTagStart, currentElement, namespace: ${currentNode?.asElement()?.namespaceURI} -> ${tag.namespace}"
+      }
+      logReplace {
+        "onTagStart, currentElement, replace: ${currentNode?.asElement()?.tagName} -> ${tag.tagName}"
+      }
+
       currentNode = if (tag.namespace != null) {
         document.createElementNS(tag.namespace, tag.tagName)
       } else {
@@ -301,111 +133,122 @@ class HtmlBuilder(
       }
 
       currentPosition.replace(currentNode!!)
-    } else {
-      //logReplace"onTagStart, same node type")
-
     }
 
     currentElement = currentNode as? Element ?: currentElement
 
     if (currentNode is Element) {
-      if (root == null) {
-        //logReplace"Setting root: $currentNode")
+      if (firstTag) {
+        logReplace { "Setting root: $currentNode" }
         root = currentNode as Element
+        firstTag = false
       }
 
-      currentElement?.clearKompAttributes()
       currentElement?.clearKompEvents()
 
+      // if currentElement = checkbox make sure it's cleared
+      (currentElement as? HTMLInputElement)?.checked = false
+
+      currentPosition.lastOrNull()?.setAttr?.clear()
       for (entry in tag.attributesEntries) {
-        currentElement!!.setKompAttribute(entry.key.lowercase(), entry.value)
-      }
-
-      if (tag.namespace != null) {
-        //logReplace"onTagStart, same node type")
-
-        (currentNode as? Element)?.innerHTML = ""
+        currentElement!!.setKompAttribute(entry.key, entry.value)
+        currentPosition.lastOrNull()?.setAttr?.add(entry.key)
       }
     }
 
-    //logReplace"onTagStart, currentElement2: $currentNode")
-
     currentPosition.push(currentNode!!)
   }
 
-  private fun checkTag(tag: Tag) {
+  private fun checkTag(source: String, tag: Tag) {
     check(currentElement != null) {
-      js("debugger")
-      "No current tag"
+      js("debugger;")
+      "No current tag ($source)"
     }
     check(currentElement?.tagName.equals(tag.tagName, ignoreCase = true)) {
-      js("debugger")
-      "Wrong current tag"
+      js("debugger;")
+      "Wrong current tag ($source), got: ${tag.tagName} expected ${currentElement?.tagName}"
     }
   }
 
-  override fun onTagAttributeChange(tag: Tag, attribute: String, value: String?) {
-    logReplace("onTagAttributeChange, ${tag.tagName} [$attribute, $value]")
+  override fun onTagAttributeChange(
+    tag: Tag,
+    attribute: String,
+    value: String?
+  ) {
+    logReplace { "onTagAttributeChange, ${tag.tagName} [$attribute, $value]" }
 
-    checkTag(tag)
+    if (Komponent.enableAssertions) {
+      checkTag("onTagAttributeChange", tag)
+    }
 
-    if (value == null) {
-      currentElement?.removeAttribute(attribute.lowercase())
+    currentElement?.setKompAttribute(attribute, value)
+    if (value == null || value.isEmpty()) {
+      currentPosition.currentPosition()?.setAttr?.remove(attribute)
     } else {
-      currentElement?.setKompAttribute(attribute.lowercase(), value)
+      currentPosition.currentPosition()?.setAttr?.add(attribute)
     }
   }
 
-  override fun onTagEvent(tag: Tag, event: String, value: (Event) -> Unit) {
-    //logReplace"onTagEvent, ${tag.tagName} [$event, $value]")
+  override fun onTagEvent(
+    tag: Tag,
+    event: String,
+    value: (kotlinx.html.org.w3c.dom.events.Event) -> Unit
+  ) {
+    logReplace { "onTagEvent, ${tag.tagName} [$event, $value]" }
 
-    checkTag(tag)
+    if (Komponent.enableAssertions) {
+      checkTag("onTagEvent", tag)
+    }
 
-    currentElement?.setKompEvent(event.lowercase(), value)
+    currentElement?.setKompEvent(event.lowercase(), value.asDynamic())
   }
 
   override fun onTagEnd(tag: Tag) {
+    logReplace {
+      "onTagEnd, [${tag.tagName}, ${tag.namespace}], currentPosition: $currentPosition"
+    }
+
+    if (exceptionThrown) {
+      return
+    }
+
     while (currentPosition.currentElement() != null) {
       currentPosition.currentElement()?.let {
         it.parentElement?.removeChild(it)
       }
     }
 
-    checkTag(tag)
+    if (Komponent.enableAssertions) {
+      checkTag("onTagEnd", tag)
+    }
 
-    currentPosition.pop()
+    if (currentElement != null) {
+      val setAttrs: Set<String> = currentPosition.currentPosition()?.setAttr ?: setOf()
 
-    val setAttrs: List<String> = currentElement.asDynamic()["komp-attributes"] ?: listOf()
+      // remove attributes that where not set
+      val element = currentElement
+      if (element?.hasAttributes() == true) {
+        for (index in 0 until element.attributes.length) {
+          val attribute = element.attributes[index]
+          if (attribute?.name != null) {
+            val attr = attribute.name
 
-    // remove attributes that where not set
-    val element = currentElement
-    if (element?.hasAttributes() == true) {
-      for (index in 0 until element.attributes.length) {
-        val attr = element.attributes[index]
-        if (attr != null) {
-
-          if (element is HTMLElement && attr.name == "data-has-focus" && "true" == attr.value) {
-            element.focus()
-          }
-
-          if (!setAttrs.contains(attr.name)) {
-            if (element is HTMLInputElement) {
-              if (attr.name == "checkbox") {
-                element.checked = false
-              } else if (attr.name == "value") {
-                element.value = ""
-              }
-            } else {
-              if (Komponent.logReplaceEvent) {
-                console.log("Clear attribute [${attr.name}]  on $element)")
-              }
-              element.removeAttribute(attr.name)
+            if (
+              !setAttrs.contains(attr) &&
+              attr != "style"
+            ) {
+              element.setKompAttribute(attr, null)
             }
           }
         }
       }
     }
 
+    currentPosition.pop()
+
+    currentNode = currentPosition.currentElement()
+    currentElement = currentNode as? Element ?: currentElement
+
     currentPosition.nextElement()
 
     currentElement = currentElement?.parentElement as? HTMLElement
@@ -479,7 +322,10 @@ class HtmlBuilder(
       //logReplace"onTagContentUnsafe, namespace: [$namespace]")
 
       if (Komponent.unsafeMode == UnsafeMode.UNSAFE_ALLOWED ||
-        (Komponent.unsafeMode == UnsafeMode.UNSAFE_SVG_ONLY && namespace == "http://www.w3.org/2000/svg")
+            (
+              Komponent.unsafeMode == UnsafeMode.UNSAFE_SVG_ONLY &&
+              namespace == "http://www.w3.org/2000/svg"
+            )
       ) {
         if (currentElement?.innerHTML != textContent) {
           currentElement?.innerHTML += textContent
@@ -505,17 +351,57 @@ class HtmlBuilder(
     currentPosition.nextElement()
   }
 
+  fun onTagError(tag: Tag, exception: Throwable) {
+    exceptionThrown = true
+
+    if (exception !is KomponentException) {
+      val position = mutableListOf<Element>()
+      var ce = currentElement
+      while (ce != null) {
+        position.add(ce)
+        ce = ce.parentElement
+      }
+      val builder = StringBuilder()
+      for (element in position.reversed()) {
+        builder.append("> ")
+        builder.append(element.tagName)
+        builder.append("[")
+        builder.append(element.findElementIndex())
+        builder.append("]")
+        if (element.hasAttribute("class")) {
+          builder.append("(")
+          builder.append(element.getAttribute("class"))
+          builder.append(")")
+        }
+        builder.append(" ")
+      }
+
+      throw KomponentException(
+        komponent,
+        currentElement,
+        tag,
+        builder.toString(),
+        exception.message ?: "error",
+        exception
+      )
+    } else {
+      throw exception
+    }
+  }
+
   override fun finalize(): Element {
     //logReplace"finalize, currentPosition: $currentPosition")
-    return root ?: throw IllegalStateException("We can't finalize as there was no tags")
+    return root ?: throw IllegalStateException(
+      "We can't finalize as there was no tags"
+    )
   }
 
   companion object {
     fun create(content: HtmlBuilder.() -> Unit): Element {
       val container = document.createElement("div") as HTMLElement
-      val consumer = HtmlBuilder(container, 0)
+      val consumer = HtmlBuilder(null, container)
       content.invoke(consumer)
-      return consumer.root ?: error("error")
+      return consumer.root ?: error("No root element found after render!")
     }
   }
 }

src/jsMain/kotlin/nl/astraeus/komp/Komponent.kt

@@ -1,32 +1,15 @@
 package nl.astraeus.komp
 
 import kotlinx.browser.window
+import kotlinx.html.FlowOrMetaDataOrPhrasingContent
 import org.w3c.dom.Element
 import org.w3c.dom.HTMLElement
-import org.w3c.dom.Node
-import org.w3c.dom.css.CSSStyleDeclaration
 import org.w3c.dom.get
-import kotlin.reflect.KProperty
 
-class StateDelegate<T>(
-  val komponent: Komponent,
-  initialValue: T
-) {
-  var value: T = initialValue
+private var currentKomponent: Komponent? = null
 
-  operator fun getValue(thisRef: Any?, property: KProperty<*>): T {
-    return value
-  }
-
-  operator fun setValue(thisRef: Any?, property: KProperty<*>, value: T) {
-    if (this.value?.equals(value) != true) {
-      this.value = value
-      komponent.requestUpdate()
-    }
-  }
-}
-
-inline fun <reified T> Komponent.state(initialValue: T): StateDelegate<T> = StateDelegate(this, initialValue)
+fun FlowOrMetaDataOrPhrasingContent.currentKomponent(): Komponent =
+  currentKomponent ?: error("No current komponent defined! Only call from render code!")
 
 enum class UnsafeMode {
   UNSAFE_ALLOWED,
@@ -34,28 +17,61 @@ enum class UnsafeMode {
   UNSAFE_SVG_ONLY
 }
 
+var Element.memoizeHash: String?
+  get() {
+    return getAttribute("memoize-hash")
+  }
+  set(value) {
+    if (value != null) {
+      setAttribute("memoize-hash", value.toString())
+    } else {
+      removeAttribute("memoize-hash")
+    }
+  }
+
 abstract class Komponent {
   val createIndex = getNextCreateIndex()
   private var dirty: Boolean = true
-  private var lastMemoizeHash: Int? = null
 
-  var element: Node? = null
-  val declaredStyles: MutableMap<String, CSSStyleDeclaration> = HashMap()
+  var element: Element? = null
 
   open fun create(parent: Element, childIndex: Int? = null) {
     onBeforeUpdate()
     val builder = HtmlBuilder(
+      this,
       parent,
-      childIndex ?: parent.childElementCount
+      childIndex ?: parent.childNodes.length
     )
 
-    builder.render()
+    try {
+      currentKomponent = this
+      builder.render()
+    } catch(e: KomponentException) {
+      errorHandler(e)
+    } finally {
+      currentKomponent = null
+    }
+
     element = builder.root
-    lastMemoizeHash = generateMemoizeHash()
+    updateMemoizeHash()
     onAfterUpdate()
   }
 
-  fun memoizeChanged() = lastMemoizeHash != null && lastMemoizeHash != generateMemoizeHash()
+  fun memoizeChanged() = element?.memoizeHash == null || element?.memoizeHash != fullMemoizeHash()
+
+  fun updateMemoizeHash() {
+    element?.memoizeHash = fullMemoizeHash()
+  }
+
+  private fun fullMemoizeHash(): String? {
+    val generated = generateMemoizeHash()
+
+    return if (generated != null) {
+      "${this::class.simpleName}:${generateMemoizeHash()}"
+    } else {
+      null
+    }
+  }
 
   abstract fun HtmlBuilder.render()
 
@@ -95,8 +111,25 @@ abstract class Komponent {
    *
    * HTMLBuilder.render() is called 1st time the component is rendered, after that this
    * method will be called
+   *
+   * @deprecated
    */
-  open fun update() {
+  @Deprecated(
+    "Deprecated to avoid confusing with requestUpdate, use renderUpdate instead",
+    ReplaceWith("renderUpdate"),
+    level = DeprecationLevel.WARNING
+  )
+  protected fun update() {
+    refresh()
+  }
+
+  /**
+   * This function can be overwritten if you know how to update the Komponent yourself
+   *
+   * HTMLBuilder.render() is called 1st time the component is rendered, after that this
+   * method will be called
+   */
+  open fun renderUpdate() {
     refresh()
   }
 
@@ -107,7 +140,7 @@ abstract class Komponent {
    */
   open fun generateMemoizeHash(): Int? = null
 
-  internal fun refresh() {
+  private fun refresh() {
     val currentElement = element
 
     check(currentElement != null) {
@@ -116,15 +149,23 @@ abstract class Komponent {
 
     val parent = currentElement.parentElement as? HTMLElement ?: error("parent is null!?")
     var childIndex = 0
-    for (index in 0 until parent.children.length) {
-      if (parent.children[index] == currentElement) {
+    for (index in 0 until parent.childNodes.length) {
+      if (parent.childNodes[index] == currentElement) {
         childIndex = index
       }
     }
-    val consumer = HtmlBuilder(parent, childIndex)
-    consumer.root = null
-    consumer.render()
-    element = consumer.root
+    val builder = HtmlBuilder(this, parent, childIndex)
+
+    try {
+      currentKomponent = this
+      builder.render()
+    } catch(e: KomponentException) {
+      errorHandler(e)
+    } finally {
+      currentKomponent = null
+    }
+
+    element = builder.root
     dirty = false
   }
 
@@ -135,17 +176,34 @@ abstract class Komponent {
   companion object {
     private var nextCreateIndex: Int = 1
     private var updateCallback: Int? = null
+    private var errorHandler: (KomponentException) -> Unit = { ke ->
+      console.error("Render error in Komponent", ke)
+
+      ke.element?.innerHTML = """<div class="komponent-error">Render error!</div>"""
+
+      window.alert("""
+        Error in Komponent '${ke.komponent}', ${ke.message}
+        Tag: ${ke.tag.tagName}
+        See console log for details
+        Position: ${ke.position}""".trimIndent()
+      )
+    }
     private var scheduledForUpdate = mutableSetOf<Komponent>()
     private var interceptor: (Komponent, () -> Unit) -> Unit = { _, block -> block() }
 
     var logRenderEvent = false
     var logReplaceEvent = false
+    var enableAssertions = false
     var unsafeMode = UnsafeMode.UNSAFE_DISABLED
 
-    fun create(parent: HTMLElement, component: Komponent, insertAsFirst: Boolean = false) {
+    fun create(parent: HTMLElement, component: Komponent) {
       component.create(parent)
     }
 
+    fun setErrorHandler(handler: (KomponentException) -> Unit) {
+      errorHandler = handler
+    }
+
     fun setUpdateInterceptor(block: (Komponent, () -> Unit) -> Unit) {
       interceptor = block
     }
@@ -185,10 +243,10 @@ abstract class Komponent {
               }
               val memoizeHash = next.generateMemoizeHash()
 
-              if (memoizeHash == null || next.lastMemoizeHash != memoizeHash) {
+              if (next.memoizeChanged()) {
                 next.onBeforeUpdate()
-                next.update()
-                next.lastMemoizeHash = memoizeHash
+                next.renderUpdate()
+                next.updateMemoizeHash()
                 next.onAfterUpdate()
               } else if (logRenderEvent) {
                 console.log("Skipped render, memoizeHash is equal $next-[$memoizeHash]")

src/jsMain/kotlin/nl/astraeus/komp/KomponentException.kt

@@ -0,0 +1,18 @@
+package nl.astraeus.komp
+
+import kotlinx.html.Tag
+import org.w3c.dom.Element
+
+class KomponentException(
+  val komponent: Komponent?,
+  val element: Element?,
+  val tag: Tag,
+  val position: String,
+  message: String,
+  cause: Throwable
+) : RuntimeException(message, cause) {
+
+  override fun toString(): String {
+    return "KompException(message='$message', tag='$tag', position='$position')"
+  }
+}

src/jsMain/kotlin/nl/astraeus/komp/MutableCollectionStateDelegate.kt

@@ -0,0 +1,54 @@
+package nl.astraeus.komp
+
+inline fun <reified T> Komponent.mutableCollectionState(
+  initialValue: MutableCollection<T>
+): MutableCollection<T> = MutableCollectionStateDelegate(
+  this,
+  initialValue
+)
+
+class MutableCollectionStateDelegate<T>(
+  val komponent: Komponent,
+  val collection: MutableCollection<T>
+): MutableCollection<T> by collection {
+
+  override fun add(element: T): Boolean {
+    komponent.requestUpdate()
+
+    return collection.add(element)
+  }
+
+  override fun addAll(elements: Collection<T>): Boolean {
+    komponent.requestUpdate()
+
+    return collection.addAll(elements)
+  }
+
+  override fun clear() {
+    komponent.requestUpdate()
+
+    collection.clear()
+  }
+
+  // todo: return iterator wrapper to update at changes?
+  //override fun iterator(): MutableIterator<T> = collection.iterator()
+
+  override fun remove(element: T): Boolean {
+    komponent.requestUpdate()
+
+    return collection.remove(element)
+  }
+
+  override fun removeAll(elements: Collection<T>): Boolean {
+    komponent.requestUpdate()
+
+    return collection.removeAll(elements)
+  }
+
+  override fun retainAll(elements: Collection<T>): Boolean {
+    komponent.requestUpdate()
+
+    return collection.retainAll(elements)
+  }
+
+}

src/jsMain/kotlin/nl/astraeus/komp/State.kt

@@ -0,0 +1,56 @@
+package nl.astraeus.komp
+
+import kotlin.reflect.KProperty
+
+interface Delegate<T> {
+
+  operator fun getValue(
+    thisRef: Any?,
+    property: KProperty<*>
+  ): T
+
+  operator fun setValue(
+    thisRef: Any?,
+    property: KProperty<*>,
+    value: T
+  )
+
+}
+
+open class StateDelegate<T>(
+  val komponent: Komponent,
+  initialValue: T
+) : Delegate<T> {
+  private var value: T = initialValue
+
+  init {
+    if (value is MutableCollection<*>) {
+      error("Use mutableList to create a collection!")
+    }
+  }
+
+  override operator fun getValue(
+    thisRef: Any?,
+    property: KProperty<*>
+  ): T {
+    return value
+  }
+
+  override operator fun setValue(
+    thisRef: Any?,
+    property: KProperty<*>,
+    value: T
+  ) {
+    if (this.value?.equals(value) != true) {
+      this.value = value
+      komponent.requestUpdate()
+    }
+  }
+}
+
+inline fun <reified T> Komponent.state(
+  initialValue: T
+): Delegate<T> = StateDelegate(
+  this,
+  initialValue
+)

src/jsTest/kotlin/nl/astraeus/komp/TestUpdate.kt

@@ -1,9 +1,13 @@
 package nl.astraeus.komp
 
 import kotlinx.browser.document
+import kotlinx.html.DIV
+import kotlinx.html.InputType
+import kotlinx.html.classes
 import kotlinx.html.div
 import kotlinx.html.i
 import kotlinx.html.id
+import kotlinx.html.input
 import kotlinx.html.js.onClickFunction
 import kotlinx.html.p
 import kotlinx.html.span
@@ -35,6 +39,7 @@ class Child1 : Komponent() {
 class Child2 : Komponent() {
   override fun HtmlBuilder.render() {
     div {
+      id ="1234"
       +"Child 2"
     }
   }
@@ -50,6 +55,10 @@ class SimpleKomponent : Komponent() {
 
   override fun HtmlBuilder.render() {
     div("div_class") {
+      input(InputType.checkBox) {
+        name = "helloInput"
+        checked = hello
+      }
       span {
         svg {
           unsafe {
@@ -117,7 +126,7 @@ class IncludeKomponent(
 }
 
 class ReplaceKomponent : Komponent() {
-  val includeKomponent = IncludeKomponent()
+  val includeKomponent = IncludeKomponent("Other text")
   var includeSpan = true
 
   override fun generateMemoizeHash(): Int = includeSpan.hashCode() * 7 + includeKomponent.generateMemoizeHash()
@@ -128,20 +137,8 @@ class ReplaceKomponent : Komponent() {
 
       div {
         if (includeSpan) {
-          span {
-            i("fas fa-eye") {
-              +"span1"
-            }
-          }
-          span {
-            i("fas fa-eye") {
-              +"span2"
-            }
-          }
-          span {
-            i("fas fa-eye") {
-              +"span3"
-            }
+          for (index in 0 ..< 3) {
+            extracted(index)
           }
         }
 
@@ -149,6 +146,14 @@ class ReplaceKomponent : Komponent() {
       }
     }
   }
+
+  private fun HtmlBuilder.extracted(index: Int) {
+    span {
+      i("fas fa-eye") {
+        + ("span" + (index+1))
+      }
+    }
+  }
 }
 
 class TestUpdate {
@@ -203,7 +208,8 @@ class TestUpdate {
   fun testCreate() {
     var elemTest: Element? = null
     val element = HtmlBuilder.create {
-      div("div_class") {
+      div(classes = "div_class") {
+        classes = classes + "bla'"
         id = "123"
         +"Test"