zakjan/app.html

## app.html
<template>
  <require from="./item"></require>

  <h1>${message}</h1>
  <ul>
    <li repeat.for="item of items">
      <input type="checkbox" model.bind="item" checked.bind="selectedItems" matcher.bind="matcher">
      <input type="checkbox" model.bind="item" checked.bind="selectedItems" matcher.bind="matcher.bind($this)">
      <input type="checkbox" model.bind="item" checked.bind="selectedItems" matcher.bind="matcherBound">
      <input type="checkbox" model.bind="item" checked.bind="selectedItems" matcher.call="matcherBound(item1, item2)">
      ${item.type} ${item.id}
    </li>
  </ul>

  <p>${selectedItemsString}</p>
</template>

## app.js
class ItemUtils {
  itemsAreEqual(item1, item2) {
    return item1 && item2 && item1.type === item2.type && item1.id === item2.id;
  }
}

export class App {
  message = 'Hello World!';
  items = [{type: "car", id: 1}, {type: "car", id: 2}, {type: "car", id: 3}, {type: "truck", id: 1}, {type: "truck", id: 2}];
  selectedItems = [{type: "truck", id: 1}];
  itemUtils = new ItemUtils();

  matcherBound = this.matcher.bind(this);

  matcher(item1, item2) {
    return this && this.itemUtils && this.itemUtils.itemsAreEqual(item1, item2);
  }

  get selectedItemsString() {
    return JSON.stringify(this.selectedItems);
  }
}

## index.html
<!doctype html>
<html>
  <head>
    <title>Aurelia</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
  </head>
  <body aurelia-app>
    <h1>Loading...</h1>

    <script src="https://cdn.rawgit.com/jdanyow/aurelia-bundle/v1.0.3/jspm_packages/system.js"></script>
    <script src="https://cdn.rawgit.com/jdanyow/aurelia-bundle/v1.0.3/config.js"></script>
    <script>
      System.import('aurelia-bootstrapper');
    </script>
  </body>
</html>

## item.html
<template>
  <button click.trigger="clickHandler(item)">${title}</button>
</template>

## item.js
import {bindable} from "aurelia-framework";

export class ItemCustomElement {
  @bindable item;
  @bindable clickHandler;
  @bindable title;
}
	<template>
	<require from="./item"></require>

	<h1>${message}</h1>
	<ul>
	<li repeat.for="item of items">
	<input type="checkbox" model.bind="item" checked.bind="selectedItems" matcher.bind="matcher">
	<input type="checkbox" model.bind="item" checked.bind="selectedItems" matcher.bind="matcher.bind($this)">
	<input type="checkbox" model.bind="item" checked.bind="selectedItems" matcher.bind="matcherBound">
	<input type="checkbox" model.bind="item" checked.bind="selectedItems" matcher.call="matcherBound(item1, item2)">
	${item.type} ${item.id}
	</li>
	</ul>

	<p>${selectedItemsString}</p>
	</template>
	class ItemUtils {
	itemsAreEqual(item1, item2) {
	return item1 && item2 && item1.type === item2.type && item1.id === item2.id;
	}
	}

	export class App {
	message = 'Hello World!';
	items = [{type: "car", id: 1}, {type: "car", id: 2}, {type: "car", id: 3}, {type: "truck", id: 1}, {type: "truck", id: 2}];
	selectedItems = [{type: "truck", id: 1}];
	itemUtils = new ItemUtils();

	matcherBound = this.matcher.bind(this);

	matcher(item1, item2) {
	return this && this.itemUtils && this.itemUtils.itemsAreEqual(item1, item2);
	}

	get selectedItemsString() {
	return JSON.stringify(this.selectedItems);
	}
	}
	<!doctype html>
	<html>
	<head>
	<title>Aurelia</title>
	<meta name="viewport" content="width=device-width, initial-scale=1">
	</head>
	<body aurelia-app>
	<h1>Loading...</h1>

	<script src="https://cdn.rawgit.com/jdanyow/aurelia-bundle/v1.0.3/jspm_packages/system.js"></script>
	<script src="https://cdn.rawgit.com/jdanyow/aurelia-bundle/v1.0.3/config.js"></script>
	<script>
	System.import('aurelia-bootstrapper');
	</script>
	</body>
	</html>
	<template>
	<button click.trigger="clickHandler(item)">${title}</button>
	</template>
	import {bindable} from "aurelia-framework";

	export class ItemCustomElement {
	@bindable item;
	@bindable clickHandler;
	@bindable title;
	}