3 releases

0.1.2	Jul 22, 2020
0.1.1	Jul 8, 2020
0.1.0	Jul 8, 2020

#668 in WebAssembly

MIT/Apache

190KB
5.5K SLoC

Valerie

Rust front-end framework for building web apps.

Valerie is still in a very early phase. A lot of features are not available at the moment. A lot of work is left and you are welcome to try it out.

No Virtual DOM.
UI can be made in a simple manner, by following an MVVM architecture rather an MVC architecture.
Use state variables to update the UI where required.
Written without any unsafe code.

Architecture

Every UI element has to implement the Component trait.
A page is a function which returns a Node.
Two type of State variables
- StateAtomic for types implementing Copy.
- StateMutex for types implementing Clone.

Setting up

Run cargo new --lib some_name
Add valerie to the dependencies
Create a static directory and create an index.html inside it

<!doctype html>
<html lang="en">
    <head>
        <meta charset="utf-8">
        <title>Title</title>
        <script type="module">
            import init from "./wasm.js"
            init()
        </script>
    </head>
    <body></body>
</html>

Also in the Cargo.toml enable lto.

[profile.release]
lto = true
opt-level = 3

Compile it using wasm-pack by running wasm-pack build --target web --out-name wasm --out-dir ./static
Use some server, like miniserve, to host the ./static folder and try it out.

Take a look at wasm-pack docs for more options.

Examples

Hello world

use valerie::prelude::components::*;
use valerie::prelude::*;

fn ui() -> Node {
    h1!("Hello World").into()
}

#[valerie(start)]
pub fn run() {
    App::render_single(ui());
}

Add and Subtract one using a Button

use valerie::prelude::components::*;
use valerie::prelude::*;

fn ui() -> Node {
    let value = StateAtomic::new(0isize);

    div!(
        h1!("Value ", value.clone()),
        button!("Add 1")
            .on_event("click", value.clone(), move |x, _| {
                *x += 1;
            }),
        button!("Subtract 1")
            .on_event("click", value.clone(), move |x, _| {
                *x -= 1;
            })
    )
    .into()
}

#[valerie(start)]
pub fn run() {
    App::render_single(ui());
}

Time Counter

use valerie::prelude::components::*;
use valerie::prelude::*;
use wasm_timer::Delay;

fn ui() -> web_sys::Node {
    let timer = StateAtomic::new(0);

    execute(time(1, timer.clone()));

    p!("Seconds passed: ", timer).into()
}

async fn time(n: u64, mut timer: StateAtomic<usize>) {
    while Delay::new(core::time::Duration::from_secs(n))
        .await
        .is_ok() {
            timer += 1;
        }
}

#[valerie(start)]
pub fn run() {
    App::render_single(ui());
}

There are more examples in the examples directory.

Missing features

Library support for CSS.
Using States for CSS.
Routing and multi-page support.
Global Variables for Multiple Pages.

Issues and Contributing

Pick out some issues and start contributing. Our contribution guidelines are available here.

Dependencies

~8–10MB
~194K SLoC