Hello World

```rust extern crate kagura; extern crate wasm_bindgen;

use kagura::prelude::; use wasm_bindgen::prelude::;

[wasm_bindgen(start)]

pub fn main() { let node = websys::window() .unwrap() .document() .unwrap() .getelementbyid("app") .unwrap(); Kagura::mount(node.into(), || { vec![Html::h1( Attributes::new(), Events::new(), vec![Html::text("Hello Kagura")], )] }); } ```

Usage

Create a project

See /project-template/^0.13 in this repogitory. This is a template of project of Kagura. You can custamize to use.

project template for ^0.13

Mount to web_sys::Node

rust Kagura::mount(web_sys::Node, impl FnMut() -> Vec<Html<Terminator>>)

Terminator is a component, which is a marker of root of dom. And, Kagura only changes children of mounted web_sys::Node.

Create a component

```rust use kagura::html::component::Cmd; use kagura::prelude::*;

// Property of component pub struct Props {}

// Message from Kagura to component pub enum Msg { Clicked, }

// Message from component to parent component // You can send message from child component to parent component by this. pub enum On {}

// Type of component // Also, this is component state too. pub struct MyComponent { greeting: String, }

// Settig Props, Msg and On to MyComponent. // (Sub means subscription.) impl Component for MyComponent { type Props = Props; type Msg = Msg; type Sub = On; }

impl Constructor for MyComponent { // Constructor of MyComponent. fn constructor(_props: &Self::Props) -> Self { Self { greeting: String::from("Hello world"), } } }

impl Update for MyComponent { // The way to update MyComponent when MyComponent receive message. // MyComponent can send some messgae to Kagura by Cmd. fn update(&mut self, _props: &Props, msg: Msg) -> Cmd { match msg { Msg::Clicked => { self.greeting = String::from("Hello from Kagura"); Cmd::none() } } } }

impl Render for MyComponent { // The way to render MyComponent to Html when MyComponent was updated. // If you want to return list of Html, // you can use Html::fragment(Vec>). fn render(&self, props: &Props, _children: Vec>) -> Html { Html::div( Attributes::new(), Events::new(), vec![ Html::h1( Attributes::new(), Events::new(), vec![Html::text(&self.greeting)], ), Html::button( Attributes::new(), Events::new().onclick( // Event handler returns a message to update. |_| Msg::Clicked, ), vec![Html::text("change greeting")], ), ], ) } } ```

Mount a component

There are default-implemented function in Constructor trait.

Self means the component which mounts to. DemirootComp means the component which is mounted to.

```rust fn with_children( props: Self::Props, sub: Sub, children: Vec>, ) -> Html;

fn with_child( props: Self::Props, sub: Sub, child: Html, ) -> Html;

fn empty( props: Self::Props, sub: Sub, ) -> Html; ```

This is a example:

```rust extern crate jssys; extern crate kagura; extern crate wasmbindgen; extern crate web_sys;

use kagura::prelude::; use wasm_bindgen::prelude::;

mod my_component;

use my_component::MyComponent;

[wasm_bindgen(start)]

pub fn main() { Kagura::mount(entrypoint(), || { vec![MyComponent::empty( mycomponent::Props {}, component::Sub::none(), )] }); }

fn entrypoint() -> websys::Node { websys::window() .unwrap() .document() .unwrap() .getelementbyid("app") .unwrap() .into() }

```

This exmaple is mounting MyComponent to Terminator. And, in customed component, like MyComponent, you can do too in render. like this:

rust impl Render for MyComponent { fn render(&self, _props: &Props, _children: Vec<Html<Self>>) -> Html<Self> { CustomedComponent::empty( customed_component::Props {}, component::Sub::none(), ) } }