Crate weblog

weblog is a crate that defines a set of macros for calling console.log(), console.error() and other members of the browser’s console API when targeting Wasm.

Features

• Supports web-sys and stdweb backends with an identical public API
• Support for variadic arguments on all calls
• No stringification before sending to the browser - log entire objects and use the full introspective debugging power of the browser console.

Examples

A simple example.

console_log!("Hello world!");

Passing multiple arguments is fine too.

console_log!("Foo", "bar", "baz");

All of the common browser log levels are supported.

console_debug!("Just testing...");
console_warn!("...but then...");
console_error!("...something bad happened.");

It’s possible to send more than just strings or &strs:

console_log!(
    "&str",
    "string".to_string(),
    1,
    2.0,
    3f32,
    true,
    false,
    Some("option"),
);

When using web-sys crate the macros accept any value that implements the Into<JsValue> trait. See JsValue for more details.

No stringification is performed on the Rust side - so objects will be fully introspectable in the browser’s console!

Usage

By default, the crate assumes the presence of the web-sys crate.

weblog = "0.3"

If you’d prefer to use it with stdweb, enable the feature in Cargo.toml:

weblog = { version = "0.3", default-features = false, features = ["stdweb"] }

Re-exports

pub use ::web_sys;

Macros

console_assert

Call the browser’s console.assert() function. MDN

console_clear

Call the browser’s console.clear() function. MDN

console_count

Call the browser’s console.count() function. MDN

console_count_reset

Call the browser’s console.countReset() function. MDN

console_debug

Call the browser’s console.debug() function. MDN

console_dir

Call the browser’s console.dir() function. MDN

console_dirxml

Call the browser’s console.dirxml() function. MDN

console_error

Call the browser’s console.error() function. MDN

console_exception

Call the browser’s console.exception() function. MDN

console_info

Call the browser’s console.info() function. MDN

console_log

Call the browser’s console.log() function. MDN

console_table

Call the browser’s console.table() function. MDN

console_time

Call the browser’s console.time() function. MDN

console_time_end

Call the browser’s console.timeEnd() function. MDN

console_time_log

Call the browser’s console.timeLog() function. MDN

console_time_stamp

Call the browser’s console.timeStamp() function. MDN

console_trace

Call the browser’s console.trace() function. MDN

console_warn

Call the browser’s console.warn() function. MDN