/crystal-web

Crystal bindings to the Web APIs for building front-end applications with WebAssembly

Primary LanguageCrystalMIT LicenseMIT

crystal-web

This shard provides bindings to Web APIs on top of crystal-js.

It is still experimental and very initial. Any help is welcome.

Installation

  1. Add the dependency to your shard.yml:

    dependencies:
  web:
    github: lbguilherme/crystal-web

  2. Run shards install

  3. Build your project with lib/js/scripts/build.sh src/main.cr Use the --release flag for an optimized build. This will produce two files: a main.wasm and a main.js.

  4. Add to your HTML file: <script defer src="main.js"></script>.

Usage

require "web"

window = Web.window
console = window.console
document = window.document

console.log "Width: #{window.inner_width}"
console.log "Height: #{window.inner_height}"

canvas = document.create_element("canvas")
document.body.append_child(canvas)
ctx = canvas.get_context("2d")
ctx.font = "30px Arial"
ctx.fill_text("Hello World!", 10, 30)

demo