Alex Crichton 3efe51eb8b Reorganize and rewrite examples
This commit is a large-ish scale reorganization of our examples. The
main goal here is to have a dedicated section of the guide for example,
and all examples will be listed there. Each example's `README` is now
just boilerplate pointing at the guide along with a blurb about how to
run it.

Some examples like `math` and `smorgasboard` have been deleted as they
didn't really serve much purpose, and others like `closures` have been
rewritten with `web-sys` instead of hand-bound bindings.

Overall it's hoped that this puts us in a good and consistent state for
our examples, with all of them being described in the guide, excerpts
are in the guide, and they're all relatively idiomatically using
`web-sys`.
2018-09-20 16:45:30 -07:00

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913 B
Rust

extern crate wasm_bindgen;
extern crate web_sys;
use wasm_bindgen::prelude::*;
// Called by our JS entry point to run the example
#[wasm_bindgen]
pub fn run() -> Result<(), JsValue> {
// Use `web_sys`'s global `window` function to get a handle on the global
// window object.
let window = web_sys::window().expect("no global `window` exists");
let document = window.document().expect("should have a document on window");
let body = document.body().expect("document should have a body");
// Manufacture the element we're gonna append
let val = document.create_element("p")?;
val.set_inner_html("Hello from Rust!");
// Right now the class inheritance hierarchy of the DOM isn't super
// ergonomic, so we manually cast `val: Element` to `&Node` to call the
// `append_child` method.
AsRef::<web_sys::Node>::as_ref(&body).append_child(val.as_ref())?;
Ok(())
}