JS with RS

Yew centrally operates on the idea of keeping everything that a reusable piece of UI may need in one place - rust files, while also keeping the underlying technology accessible where necessary.

As of today, WebAssembly is not feature-complete for DOM interactions. This means even in Yew we sometimes rely on calling Javascript. What follows is an overview of the involved libraries.

wasm-bindgen

wasm-bindgen is a library and tool that enables calls to javascript from rust and back to rust from javascript.

We highly recommend you take a look at their documentation and our quick guide.

web-sys

The web-sys crate provides bindings for Web APIs and allows us to write Javascript code in a rustyfied and safe way.

Example:

JS

let document = window.document

RS

use wasm_bindgen::UnwrapThrowExt;
use web_sys::window;

let document = window()
    .expect_throw("window is undefined")
    .document()
    .expect_throw("document is undefined");

Once again we highly recommend you take a look at their documentation and our quick guide.