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authorRobert Jaros <rjaros@finn.pl>2018-11-11 00:07:32 +0100
committerRobert Jaros <rjaros@finn.pl>2018-11-11 00:07:32 +0100
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----
-layout: post
-title: "Introduction"
-author: Robert Jaros
-date: 2018-03-01 14:50:53 +0100
-categories: kvision kotlin
----
-
-This is my first article about [KVision](https://github.com/rjaros/kvision) - a new open source Web UI framework written in Kotlin language.
-I plan to write a series of them - describing what KVision is and how to use it. I will try to explain the design, focus on the
-unique features and demonstrate the usage examples.
-
-### Why new framework?
-
-There are of course many different front-end frameworks on the market. A lot of them share many similarities, others offer some special and unique features.
-Probably most of them are plain JavaScript frameworks, but there are other languages and technologies in play as well.
-Just look at [TodoMVC](http://todomvc.com) website to find them and learn about them.
-
-I've been working with different technologies and frameworks for many years. I've used them in many commercial and non-commercial projects of different size and complexity.
-Most of the time I was more then satisfied with the tools I've been using. But I've never found a solution, I could just call perfect. There was always something missing
-and something was not fully correct.
-
-I don't really like to go with the mainstream. I like to explore and learn new possibilities. I try to make things easier and more productive. I like to reuse and integrate good stuff,
-made by other people available in open source. I had many thoughts and conclusions about features, a perfect framework should have.
-And finally I've decided to make my own framework. I plan to make it a perfect solution for me - it's quite easy when you know the expectations ;-)
-But I hope it can be a good solutions for a few other developers as well.
-
-### Main features
-
-#### Compiled and strongly typed programming language
-
-When you work on a small project, dynamic and loosely typed programming language (like JavaScript) is more then OK.
-But when the project becomes big and complex, and more developers are working with it, you just need to have more control over the code. You have to be able
-to find bugs as soon as possible. You have to be able to refactor a large portions of code. It is possible only with compiled languages.
-There are a few such languages in use for web development today - e.g. TypeScript or Scala. And Kotlin is just at the beginning of its way in this
-direction. In fact, KVision project started as "SVision" written with [Scala.js](https://www.scala-js.org/), but soon I've decided to change the language to Kotlin,
-because of much better IDE support, simpler design and better compilation time.
-
-#### Object oriented, imperative design
-
-Unlike most of the popular web frameworks (AngularJS, React, Vue.js and others),
-KVision is not declarative - it is not designed to mix HTML code (or pseudo code) with a typical
-programming language. You can write KVision application without any knowledge of HTML or CSS,
-but at the same time you are able to use this knowledge if you wish.
-
-In KVision everything is just written in Kotlin. Your whole application is designed as type-safe and compiled.
-KVision gives you a hierarchy of consistent components, which you can just use in your project or which you can extend to
-modify their default behavior. You reuse you code by well known OOP design patterns - composition and inheritance.
-
-This design is well known in the UI programming world. In fact, it's probably used everywhere but in the web environment.
-Swing, JavaFX, QT and WinForms are clear and solid examples of object oriented UI libraries and KVision goes the same way.
-
-#### Ready to use components
-
-Many frameworks give you well designed architecture but lack ready to use components. You have to
-search the Internet to find ways to use rich text editor, advanced select box, date picker or even
-a simple tab panel.
-
-KVision contains:
-
-- sophisticated containers (tabs, stack, dock, grid, horizontal, vertical, flexbox, responsive),
-- a bunch of text input components including rich text editor
-- buttons, checboxes and radios
-- date and time picker
-- spinner
-- advanced select box with ajax support
-- data binding components
-- modals
-- floating, resizable windows
-
-All of them with modern, [Bootstrap](https://getbootstrap.com/) based look & feel, and a consistent behavior.
-
-#### Forms support
-
-Almost all non trivial applications use some kind of forms. But implementing form support in not only about
-showing form controls on the screen. Form items are bound to some data model, and this model should be type-safe.
-You would like your text inputs to be "Strings", but you would also like your date values to be of "Date" type,
-your spinner value to be "Number" and your checkbox state to be "Boolean". KVision lets you do it in an easy
-and consistent way. And additionally it allows you to define and test validation for single fields or for the complete forms.
-
-#### Suitable for any application
-
-KVision was designed to be open and flexible. By default it gives you [Bootstrap](https://getbootstrap.com/) based look & feel,
-but it can be disabled if you wish. Then you can design your application appearance from the scratch, and you are limited only
-by your own knowledge of CSS.
-
-Ability to implement a fully compatible [TodoMVC](http://todomvc.com)
-application, which you can find in the [KVision-examples](https://github.com/rjaros/kvision-examples) repository,
-proves that KVision is suitable for any kind of projects, including responsive, mobile web applications or even a simple, plain websites.
-
-#### Last but not least
-
-Other KVision features:
-
-- Type safe DSL builders
-- [Font awesome](https://fontawesome.com/) icons support
-- Drag & drop support
-- Integrated JS router
-- [Karma](https://karma-runner.github.io/) testing framework support
-- Full IDE support with IntelliJ IDEA Community Edition
-
-make this framework a complete solution ready for many different use cases. I will go into details of these features
-in the following articles.
-
-### Get started
-
-1. Download [KVision examples](https://github.com/rjaros/kvision-examples) from GitHub:
-
- git clone https://github.com/rjaros/kvision-examples.git
-
-2. Enter "template" example directory:
-
- cd kvision-examples/template (on Linux)
- cd kvision-examples\template (on Windows)
-
-3. Run Gradle incremental build with:
-
- ./gradlew -t run (on Linux)
- gradlew.bat -t run (on Windows)
-
-4. Open [http://localhost:8088/](http://localhost:8088/) in your browser.
-
-5. Import "template" project in IntelliJ IDEA and open src/main/kotlin/com/example/App.kt file.
-You can of course use your favourite text editor.
-
-6. Add some code inside the **start** function:
-
- override fun start(state: Map<String, Any>) {
- Root("kvapp") {
- label("Hello world!")
- }
- }
-
-7. See your changes immediately in the browser.
-
-### Learn more
-
-- Explore all [KVision examples](https://github.com/rjaros/kvision-examples)
-- Read other articles at [KVision website](https://rjaros.github.io/kvision/)
-- Check [API Documentation](https://rjaros.github.io/kvision/api/)
-- Fork and play with the [source code](https://github.com/rjaros/kvision)