Commands for Ember

Implementation of the Command design pattern from C-Q-S for ember.

• Commands are a primitives to be passed around
• Commands are just functions
• Commands are composable of many functions (but stays a function)
• Commands can have/be a link (but stays a function)
• Use commands with (fn) and enjoy partial applications (because it stayed a function)

What you'll get:

• A Command class to extend from for your implementation
• A LinkCommand as syntactic sugar for creating a link (through ember-link)
• A @command decorator to connect your component with your command
• A <CommandElement> component as your building block to attach your command to the UI
• The <CommandElement> will accept a Command, an @action or a (link)
• The <CommandElement> will render the correct HTML element to take care of accessibility

Documentation

Read the Documentation

Installation

Install ember-command with:

ember install ember-command

Usage

The idea for ember-command is clearly to separate your business logic from your UI by offering a couple of mechanics to do that.

Actions

Write an action that invokes a service within a single file component.

import { action } from 'ember-command';
import { on } from '@ember/modifier';

const inc = action(({ services }) => () => {
  services.counter.inc();
});

const Counter = <template>
  <button type="button" {{(inc)}}>+</button>
</template>

export default Counter;

Composing

Compose various commands together to form a primitive that can be passed around. This works well in combination with ember-link.

Let's make a link and add tracking to it:

import { command, action, CommandElement } from 'ember-command';
import { link } from 'ember-link';

const track = action(({ services }) => (event: string) => {
  services.tracking.track(event);
});

const HomeLink = <template>
  <CommandElement @command={{command 
    (fn (track) "go home")
    (link "application")
  }}>Home</CommandElement>
</template>

export default HomeLink;

Contributing

See the Contributing guide for details.

License

This project is licensed under the MIT License.