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Show how to use web-sys::console::log from the console_log example

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This commit is contained in:
Andrew Chin 2018-08-17 22:54:59 -04:00
parent 7a08da9205
commit 4a994da904
3 changed files with 13 additions and 2 deletions
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1
examples/console_log/Cargo.toml
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@ -8,3 +8,4 @@ crate-type = ["cdylib"]
[dependencies] [dependencies]
wasm-bindgen = { path = "../.." } wasm-bindgen = { path = "../.." }
web-sys = { path = "../../crates/web-sys" }

6
examples/console_log/README.md
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@ -2,8 +2,10 @@
[View this example online](https://webassembly.studio/?f=ppd7u8k9i9) [View this example online](https://webassembly.studio/?f=ppd7u8k9i9)
This directory is an example of using the `#[wasm_bindgen]` macro to import the
`console.log` function and call it This directory is an example of two ways to get access to the `console.log` function.
The first way uses the `#[wasm_bindgen]` macro to import the function and call it.
The second way uses the binding from the `web-sys` crate.
You can build the example with: You can build the example with:

8
examples/console_log/src/lib.rs
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@ -1,9 +1,14 @@
#![feature(use_extern_macros)] #![feature(use_extern_macros)]
extern crate wasm_bindgen; extern crate wasm_bindgen;
extern crate web_sys;
use wasm_bindgen::prelude::*; use wasm_bindgen::prelude::*;
// You can use the console bindings from web-sys...
use web_sys::console;
// ... or you can manually write the bindings yourself
#[wasm_bindgen] #[wasm_bindgen]
extern "C" { extern "C" {
#[wasm_bindgen(js_namespace = console)] #[wasm_bindgen(js_namespace = console)]
@ -19,4 +24,7 @@ pub fn run() {
log("Hello from Rust!"); log("Hello from Rust!");
log_u32(42); log_u32(42);
log_many("Logging", "many values!"); log_many("Logging", "many values!");
console::log(JsValue::from("Another message from rust!"));
console::log(JsValue::from(56u32));
} }