59 lines
1.9 KiB
Rust
59 lines
1.9 KiB
Rust
#[macro_use]
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extern crate cfg_if;
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extern crate wasm_bindgen;
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use wasm_bindgen::prelude::*;
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cfg_if! {
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// When the `console_error_panic_hook` feature is enabled, we can call the
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// `set_panic_hook` function to get better error messages if we ever panic.
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if #[cfg(feature = "console_error_panic_hook")] {
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extern crate console_error_panic_hook;
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use console_error_panic_hook::set_once as set_panic_hook;
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}
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}
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cfg_if! {
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// When the `wee_alloc` feature is enabled, use `wee_alloc` as the global
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// allocator.
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if #[cfg(feature = "wee_alloc")] {
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extern crate wee_alloc;
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#[global_allocator]
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static ALLOC: wee_alloc::WeeAlloc = wee_alloc::WeeAlloc::INIT;
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}
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}
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// Definitions of the functionality available in JS, which wasm-bindgen will
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// generate shims for today (and eventually these should be near-0 cost!)
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//
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// These definitions need to be hand-written today but the current vision is
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// that we'll use WebIDL to generate this `extern` block into a crate which you
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// can link and import. There's a tracking issue for this at
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// https://github.com/rustwasm/wasm-bindgen/issues/42
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//
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// In the meantime these are written out by hand and correspond to the names and
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// signatures documented on MDN, for example
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#[wasm_bindgen]
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extern "C" {
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type HTMLDocument;
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static document: HTMLDocument;
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#[wasm_bindgen(method)]
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fn createElement(this: &HTMLDocument, tagName: &str) -> Element;
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#[wasm_bindgen(method, getter)]
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fn body(this: &HTMLDocument) -> Element;
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type Element;
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#[wasm_bindgen(method, setter = innerHTML)]
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fn set_inner_html(this: &Element, html: &str);
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#[wasm_bindgen(method, js_name = appendChild)]
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fn append_child(this: &Element, other: Element);
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}
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// Called by our JS entry point to run the example
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#[wasm_bindgen]
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pub fn run() {
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let val = document.createElement("p");
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val.set_inner_html("IT IS ALIVE");
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document.body().append_child(val);
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}
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