sjarvela/index.html

## index.html
<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>Dumber Gist</title>
  <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1.0, user-scalable=no">
  <base href="/">
</head>
<!--
Dumber Gist uses dumber bundler, the default bundle file
is /dist/entry-bundle.js.
The starting module is pointed to "main" (data-main attribute on script)
which is your src/main.js.
-->
<body>
  <my-app></my-app>
  <script src="/dist/entry-bundle.js" data-main="main"></script>
</body>
</html>

## package.json
{
  "dependencies": {
    "aurelia": "latest"
  }
}

## src\main.js
import Aurelia from 'aurelia';
import { MyApp } from './my-app';

Aurelia.app(MyApp).start();

## src\my-app.html
<import from="./my-element"></import>

<h2>Call</h2>

<my-element callback.call="onCallback($event.param)" />

Callback received with param: ${paramReceived}


## src\my-app.js
import { bindable } from "aurelia";

export class MyApp {
  @bindable
  paramReceived;

  onCallback(param) {
    console.log('Callback invoked', param)
    this.paramReceived = param
  }
}

## src\my-element.html
<div style="border: 1px solid red">
  <button click.trigger="onClick()">Invoke callback</button>
  Callback invoked with: ${nr}
</div>

## src\my-element.js
import { bindable } from "aurelia";

export class MyElementCustomElement {
  @bindable
  callback;

  @bindable
  nr = 0;

  onClick() {
    this.nr++;
    console.log('Invoking callback', this.callback, this.nr)

    this.callback({param: this.nr});
  }

}
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8">
	<title>Dumber Gist</title>
	<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1.0, user-scalable=no">
	<base href="/">
	</head>
	<!--
	Dumber Gist uses dumber bundler, the default bundle file
	is /dist/entry-bundle.js.
	The starting module is pointed to "main" (data-main attribute on script)
	which is your src/main.js.
	-->
	<body>
	<my-app></my-app>
	<script src="/dist/entry-bundle.js" data-main="main"></script>
	</body>
	</html>
	import Aurelia from 'aurelia';
	import { MyApp } from './my-app';

	Aurelia.app(MyApp).start();
	<import from="./my-element"></import>

	<h2>Call</h2>

	<my-element callback.call="onCallback($event.param)" />

	Callback received with param: ${paramReceived}
	import { bindable } from "aurelia";

	export class MyApp {
	@bindable
	paramReceived;

	onCallback(param) {
	console.log('Callback invoked', param)
	this.paramReceived = param
	}
	}
	<div style="border: 1px solid red">
	<button click.trigger="onClick()">Invoke callback</button>
	Callback invoked with: ${nr}
	</div>
	import { bindable } from "aurelia";

	export class MyElementCustomElement {
	@bindable
	callback;

	@bindable
	nr = 0;

	onClick() {
	this.nr++;
	console.log('Invoking callback', this.callback, this.nr)

	this.callback({param: this.nr});
	}

	}