AStoker/CustomElement1.html

## app.html
<template>
  <require from="CustomElement1"></require>
  Hello world
  <br />
  <custom-element1 items.bind="items" selected.bind="selectedItems"></custom-element1>
</template>

## app.js
export class App {
  items = [];
  selectedItems = [];

  constructor () {
    for (let i = 0; i < 5; i++) {
      this.items.push({
        id: i,
        text: `Item: ${i}`
      });
    }
  }
}

## CustomElement1.html
<template>
  <require from="CustomElement2"></require>
  <label>Custom Element 1</label>
  <br />
  <input value.bind="query" />
  <br />
  <custom-element2 items.bind="items2">
    <template replace-part="item">
      <li repeat.for="item of items">
        <label click.delegate="select(item, $event)">
          <input type="radio" model.bind="item" matcher.bind="matcher" checked.bind="selected"/>
          ${item.text}
        </label>
      </li>
    </template>
  </custom-element2>
  <br />
  <label>Selected items</label>
  <ul>
    <li repeat.for="item of selected">${item.text}</li>
  </ul>
</template>

## CustomElement1.js
import {inject, bindable, BindingEngine} from 'aurelia-framework';

@inject(BindingEngine)
export class CustomElement1 {

  @bindable items;
  @bindable selected;

  constructor(bindingEngine) {
    this.query = '';
    this.items2 = [];
    bindingEngine.propertyObserver(this, 'query')
      .subscribe(this.queryChanged.bind(this));
  }

  bind() {
    this.items2 = this.items;
  }

  select(item, ev) {
    return true;
  }

  matcher(a, b) {
    console.log(a, b);
    return a.id === b.id;
  }

  queryChanged(newVal) {
    this.items2 = this.items.filter(i => {
      return i.text.indexOf(this.query) > -1 ? true : false;
    });
  }

}

## CustomElement2.html
<template>
  <label>Custom Element 2</label>
  <ul>
    <li repeat.for="foo of funkyItems">
      <ul>
        <li replaceable part="item" repeat.for="item of items">
          <label>
            <input type="checkbox" />
            ${item.text}
          </label>
        </li>
      </ul>
    </li>
  </ul>
</template>

## CustomElement2.js
import {bindable} from 'aurelia-framework';


export class CustomElement2 {
  @bindable items;

  funkyItems = [];

  itemsChanged() {
    for(let item of this.items) {
      this.funkyItems.push({
        text: 'bla',
        item: item
      });
    }
  }
}

## 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://jdanyow.github.io/rjs-bundle/node_modules/requirejs/require.js"></script>
    <script src="https://jdanyow.github.io/rjs-bundle/config.js"></script>
    <script src="https://jdanyow.github.io/rjs-bundle/bundles/aurelia.js"></script>
    <script src="https://jdanyow.github.io/rjs-bundle/bundles/babel.js"></script>
    <script>
      require(['aurelia-bootstrapper']);
    </script>
  </body>
</html>
	<template>
	<require from="CustomElement1"></require>
	Hello world
	<br />
	<custom-element1 items.bind="items" selected.bind="selectedItems"></custom-element1>
	</template>
	export class App {
	items = [];
	selectedItems = [];

	constructor () {
	for (let i = 0; i < 5; i++) {
	this.items.push({
	id: i,
	text: `Item: ${i}`
	});
	}
	}
	}
	<template>
	<require from="CustomElement2"></require>
	<label>Custom Element 1</label>
	<br />
	<input value.bind="query" />
	<br />
	<custom-element2 items.bind="items2">
	<template replace-part="item">
	<li repeat.for="item of items">
	<label click.delegate="select(item, $event)">
	<input type="radio" model.bind="item" matcher.bind="matcher" checked.bind="selected"/>
	${item.text}
	</label>
	</li>
	</template>
	</custom-element2>
	<br />
	<label>Selected items</label>
	<ul>
	<li repeat.for="item of selected">${item.text}</li>
	</ul>
	</template>
	import {inject, bindable, BindingEngine} from 'aurelia-framework';

	@inject(BindingEngine)
	export class CustomElement1 {

	@bindable items;
	@bindable selected;

	constructor(bindingEngine) {
	this.query = '';
	this.items2 = [];
	bindingEngine.propertyObserver(this, 'query')
	.subscribe(this.queryChanged.bind(this));
	}

	bind() {
	this.items2 = this.items;
	}

	select(item, ev) {
	return true;
	}

	matcher(a, b) {
	console.log(a, b);
	return a.id === b.id;
	}

	queryChanged(newVal) {
	this.items2 = this.items.filter(i => {
	return i.text.indexOf(this.query) > -1 ? true : false;
	});
	}

	}
	<template>
	<label>Custom Element 2</label>
	<ul>
	<li repeat.for="foo of funkyItems">
	<ul>
	<li replaceable part="item" repeat.for="item of items">
	<label>
	<input type="checkbox" />
	${item.text}
	</label>
	</li>
	</ul>
	</li>
	</ul>
	</template>
	import {bindable} from 'aurelia-framework';


	export class CustomElement2 {
	@bindable items;

	funkyItems = [];

	itemsChanged() {
	for(let item of this.items) {
	this.funkyItems.push({
	text: 'bla',
	item: item
	});
	}
	}
	}
	<!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://jdanyow.github.io/rjs-bundle/node_modules/requirejs/require.js"></script>
	<script src="https://jdanyow.github.io/rjs-bundle/config.js"></script>
	<script src="https://jdanyow.github.io/rjs-bundle/bundles/aurelia.js"></script>
	<script src="https://jdanyow.github.io/rjs-bundle/bundles/babel.js"></script>
	<script>
	require(['aurelia-bootstrapper']);
	</script>
	</body>
	</html>