drub0y/app.html

## app.html
<template>
  <div class="collapsible-open-close-events">
    <ul md-collapsible="on-open.call: collapsibleOpen($event); on-close.call: collapsibleClose($event)">
      <li ref="firstSection">
        <div class="collapsible-header"><i class="mdi-image-filter-drama"></i>First<span md-badge data-badge-caption="opens">${firstSection.openCount || 0}</span><span md-badge data-badge-caption="closes">${firstSection.closeCount || 0}</span></div>
        <div class="collapsible-body"><p>Lorem ipsum dolor sit amet.</p></div>
      </li>
      <li ref="secondSection">
        <div class="collapsible-header"><i class="mdi-maps-place"></i>Second<span md-badge data-badge-caption="opens">${secondSection.openCount || 0}</span><span md-badge data-badge-caption="closes">${secondSection.closeCount || 0}</span></div>
        <div class="collapsible-body"><p>Lorem ipsum dolor sit amet.</p></div>
      </li>
    </ul>
  </div>
</template>

## app.js
import { inject, bindable } from 'aurelia-framework'
import { MdToastService } from 'aurelia-materialize-bridge';

@inject(MdToastService)
export class App {
  constructor(toastService) {
    this.toastService = toastService;
  }

  collapsibleOpen(targetElement) {
    targetElement.openCount = (targetElement.openCount || 0) + 1;

    this.toastService.show("Open Callback Received!", 1000);
  }

  collapsibleClose(targetElement) {
    targetElement.closeCount = (targetElement.closeCount || 0) + 1;

    this.toastService.show("Close Callback Received!", 1000);
  }
}

## index.html
<!doctype html>
<html>
  <head>
    <title>Aurelia</title>
    <link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">
    <meta name="viewport" content="width=device-width, initial-scale=1">
  </head>
  <body aurelia-app="main">
    <h1>Loading...</h1>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.6/system.js"></script>
    <script src="https://rawgit.com/aurelia-ui-toolkits/aurelia-materialize-bundles/0.20.2/config2.js"></script>
    <script>
      System.import('aurelia-bootstrapper');
    </script>
  </body>
</html>

## main.js
/*******************************************************************************
 * The following two lines enable async/await without using babel's
 * "runtime" transformer. Uncomment the lines if you intend to use async/await.
 *
 * More info here:  https://github.com/jdanyow/aurelia-plunker/issues/2
 */
//import regeneratorRuntime from 'babel-runtime/regenerator';
//window.regeneratorRuntime = regeneratorRuntime;
/******************************************************************************/

import 'materialize';

export function configure(aurelia) {
  aurelia.use
    .standardConfiguration()
    .developmentLogging()
    .plugin('aurelia-materialize-bridge', bridge => bridge.useAll() );

  aurelia.start().then(a => a.setRoot());
}
	<template>
	<div class="collapsible-open-close-events">
	<ul md-collapsible="on-open.call: collapsibleOpen($event); on-close.call: collapsibleClose($event)">
	<li ref="firstSection">
	<div class="collapsible-header"><i class="mdi-image-filter-drama"></i>First<span md-badge data-badge-caption="opens">${firstSection.openCount \|\| 0}</span><span md-badge data-badge-caption="closes">${firstSection.closeCount \|\| 0}</span></div>
	<div class="collapsible-body"><p>Lorem ipsum dolor sit amet.</p></div>
	</li>
	<li ref="secondSection">
	<div class="collapsible-header"><i class="mdi-maps-place"></i>Second<span md-badge data-badge-caption="opens">${secondSection.openCount \|\| 0}</span><span md-badge data-badge-caption="closes">${secondSection.closeCount \|\| 0}</span></div>
	<div class="collapsible-body"><p>Lorem ipsum dolor sit amet.</p></div>
	</li>
	</ul>
	</div>
	</template>
	import { inject, bindable } from 'aurelia-framework'
	import { MdToastService } from 'aurelia-materialize-bridge';

	@inject(MdToastService)
	export class App {
	constructor(toastService) {
	this.toastService = toastService;
	}

	collapsibleOpen(targetElement) {
	targetElement.openCount = (targetElement.openCount \|\| 0) + 1;

	this.toastService.show("Open Callback Received!", 1000);
	}

	collapsibleClose(targetElement) {
	targetElement.closeCount = (targetElement.closeCount \|\| 0) + 1;

	this.toastService.show("Close Callback Received!", 1000);
	}
	}
	<!doctype html>
	<html>
	<head>
	<title>Aurelia</title>
	<link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">
	<meta name="viewport" content="width=device-width, initial-scale=1">
	</head>
	<body aurelia-app="main">
	<h1>Loading...</h1>
	<script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.6/system.js"></script>
	<script src="https://rawgit.com/aurelia-ui-toolkits/aurelia-materialize-bundles/0.20.2/config2.js"></script>
	<script>
	System.import('aurelia-bootstrapper');
	</script>
	</body>
	</html>
	/*******************************************************************************
	* The following two lines enable async/await without using babel's
	* "runtime" transformer. Uncomment the lines if you intend to use async/await.
	*
	* More info here: https://github.com/jdanyow/aurelia-plunker/issues/2
	*/
	//import regeneratorRuntime from 'babel-runtime/regenerator';
	//window.regeneratorRuntime = regeneratorRuntime;
	/******************************************************************************/

	import 'materialize';

	export function configure(aurelia) {
	aurelia.use
	.standardConfiguration()
	.developmentLogging()
	.plugin('aurelia-materialize-bridge', bridge => bridge.useAll() );

	aurelia.start().then(a => a.setRoot());
	}