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<ol class="chapter"><li class="affix"><a href="../../introduction.html">Introduction</a></li><li class="spacer"></li><li><a href="../../examples/index.html"><strong aria-hidden="true">1.</strong> Examples</a></li><li><ol class="section"><li><a href="../../examples/hello-world.html"><strong aria-hidden="true">1.1.</strong> Hello, World!</a></li><li><a href="../../examples/console-log.html"><strong aria-hidden="true">1.2.</strong> Using console.log</a></li><li><a href="../../examples/add.html"><strong aria-hidden="true">1.3.</strong> Small wasm files</a></li><li><a href="../../examples/without-a-bundler.html"><strong aria-hidden="true">1.4.</strong> Without a Bundler</a></li><li><a href="../../examples/wasm2js.html"><strong aria-hidden="true">1.5.</strong> Converting WebAssembly to JS</a></li><li><a href="../../examples/import-js.html"><strong aria-hidden="true">1.6.</strong> Importing functions from JS</a></li><li><a href="../../examples/char.html"><strong aria-hidden="true">1.7.</strong> Working with char</a></li><li><a href="../../examples/wasm-in-wasm.html"><strong aria-hidden="true">1.8.</strong> js-sys: WebAssembly in WebAssembly</a></li><li><a href="../../examples/dom.html"><strong aria-hidden="true">1.9.</strong> web-sys: DOM hello world</a></li><li><a href="../../examples/closures.html"><strong aria-hidden="true">1.10.</strong> web-sys: Closures</a></li><li><a href="../../examples/performance.html"><strong aria-hidden="true">1.11.</strong> web-sys: performance.now</a></li><li><a href="../../examples/fetch.html"><strong aria-hidden="true">1.12.</strong> web-sys: using fetch</a></li><li><a href="../../examples/2d-canvas.html"><strong aria-hidden="true">1.13.</strong> web-sys: canvas hello world</a></li><li><a href="../../examples/julia.html"><strong aria-hidden="true">1.14.</strong> web-sys: canvas Julia set</a></li><li><a href="../../examples/web-audio.html"><strong aria-hidden="true">1.15.</strong> web-sys: WebAudio</a></li><li><a href="../../examples/webgl.html"><strong aria-hidden="true">1.16.</strong> web-sys: WebGL</a></li><li><a href="../../examples/websockets.html"><strong aria-hidden="true">1.17.</strong> web-sys: WebSockets</a></li><li><a href="../../examples/webrtc_datachannel.html"><strong aria-hidden="true">1.18.</strong> web-sys: WebRTC DataChannel</a></li><li><a href="../../examples/request-animation-frame.html"><strong aria-hidden="true">1.19.</strong> web-sys: requestAnimationFrame</a></li><li><a href="../../examples/paint.html"><strong aria-hidden="true">1.20.</strong> web-sys: A Simple Paint Program</a></li><li><a href="../../examples/raytrace.html"><strong aria-hidden="true">1.21.</strong> Parallel Raytracing</a></li><li><a href="../../examples/todomvc.html"><strong aria-hidden="true">1.22.</strong> web-sys: A TODO MVC App</a></li></ol></li><li><a href="../../reference/index.html"><strong aria-hidden="true">2.</strong> Reference</a></li><li><ol class="section"><li><a href="../../reference/deployment.html"><strong aria-hidden="true">2.1.</strong> Deployment</a></li><li><a href="../../reference/js-snippets.html"><strong aria-hidden="true">2.2.</strong> JS snippets</a></li><li><a href="../../reference/passing-rust-closures-to-js.html"><strong aria-hidden="true">2.3.</strong> Passing Rust Closures to JS</a></li><li><a href="../../reference/receiving-js-closures-in-rust.html"><strong aria-hidden="true">2.4.</strong> Receiving JS Closures in Rust</a></li><li><a href="../../reference/js-promises-and-rust-futures.html"><strong aria-hidden="true">2.5.</strong> Promises and Futures</a></li><li><a href="../../reference/iterating-over-js-values.html"><strong aria-hidden="true">2.6.</strong> Iterating over JS Values</a></li><li><a href="../../reference/arbitrary-data-with-serde.html"><strong aria-hidden="true">2.7.</strong> Arbitrary Data with Serde</a></li><li><a href="../../reference/accessing-properties-of-untyped-js-values.html"><strong aria-hidden="true">2.8.</strong> Accessing Properties of Untyped JS Values</a></li><li><a href="../../reference/working-with-duck-typed-interfaces.html"><
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This is the <strong>unpublished</strong> documentation of
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<code>wasm-bindgen</code>, the published documentation is available
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<a href="https://rustwasm.github.io/docs/wasm-bindgen/">
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on the main Rust and WebAssembly documentation site
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</a>. Features documented here may not be available in released versions of
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<code>wasm-bindgen</code>.
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<h1 class="menu-title">The `wasm-bindgen` Guide</h1>
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<main>
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<h1><a class="header" href="#web-sys-overview" id="web-sys-overview"><code>web-sys</code> Overview</a></h1>
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<p>The <code>web-sys</code> crate has this file and directory layout:</p>
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<pre><code class="language-text">.
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├── build.rs
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├── Cargo.toml
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├── README.md
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├── src
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│ └── lib.rs
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└── webidls
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└── enabled
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└── ...
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</code></pre>
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<h3><a class="header" href="#webidlsenabledwebidl" id="webidlsenabledwebidl"><code>webidls/enabled/*.webidl</code></a></h3>
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<p>These are the WebIDL interfaces that we will actually generate bindings for (or
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at least bindings for <em>some</em> of the things defined in these files).</p>
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<h3><a class="header" href="#buildrs" id="buildrs"><code>build.rs</code></a></h3>
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<p>The <code>build.rs</code> invokes <code>wasm-bindgen</code>'s WebIDL frontend on all the WebIDL files
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in <code>webidls/enabled</code>. It writes the resulting bindings into the cargo build's
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out directory.</p>
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<h3><a class="header" href="#srclibrs" id="srclibrs"><code>src/lib.rs</code></a></h3>
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<p>The only thing <code>src/lib.rs</code> does is include the bindings generated at compile
|
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time in <code>build.rs</code>. Here is the whole <code>src/lib.rs</code> file:</p>
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<pre><pre class="playpen"><code class="language-rust">
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# #![allow(unused_variables)]
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#fn main() {
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//! Raw API bindings for Web APIs
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//!
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//! This is a procedurally generated crate from browser WebIDL which provides a
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//! binding to all APIs that browser provide on the web.
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//!
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//! This crate by default contains very little when compiled as almost all of
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//! its exposed APIs are gated by Cargo features. The exhaustive list of
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//! features can be found in `crates/web-sys/Cargo.toml`, but the rule of thumb
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//! for `web-sys` is that each type has its own cargo feature (named after the
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//! type). Using an API requires enabling the features for all types used in the
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//! API, and APIs should mention in the documentation what features they
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//! require.
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#![doc(html_root_url = "https://docs.rs/web-sys/0.2")]
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#![allow(deprecated)]
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mod features;
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pub use features::*;
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/// Getter for the `Window` object
|
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///
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/// [MDN Documentation]
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///
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/// *This API requires the following crate features to be activated: `Window`*
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///
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/// [MDN Documentation]: https://developer.mozilla.org/en-US/docs/Web/API/Window
|
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#[cfg(feature = "Window")]
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pub fn window() -> Option<Window> {
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use wasm_bindgen::JsCast;
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js_sys::global().dyn_into::<Window>().ok()
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}
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#}</code></pre></pre>
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<h3><a class="header" href="#cargo-features" id="cargo-features">Cargo features</a></h3>
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<p>When compiled the crate is almost empty by default, which probably isn't what
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you want! Due to the very large number of APIs, this crate uses features to
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enable portions of its API to reduce compile times. The list of features in
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<code>Cargo.toml</code> all correspond to types in the generated functions. Enabling a
|
||
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feature enables that type. All methods should indicate what features need to be
|
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activated to use the method.</p>
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