Toggle local dropdown

components.my-component-body.js

import Ember from 'ember';

export default Ember.Component.extend({  
});

components.my-component-trigger.js

import Ember from 'ember';

export default Ember.Component.extend({
	tagName: 'button',
});

components.my-component.js

import Ember from 'ember';

export default Ember.Component.extend({
  isExpanded: false,
  
  classNames: ['my-component'],

  actions: {
  	toggle() {
      this.toggleProperty('isExpanded');
      
      if (!this.get('isExpanded')) {
				return;
      }
      
			this._setupClickHandler();
    },
  },
  
  willDestroyElement() {
    this._super(...arguments);
    this._teardownClickHandler();
  },
  
  _setupClickHandler() {
    $(document).on(`click.${this.elementId}`, (e) => {
      if (!e.target.closest(`#${this.elementId}`)) {
        this.set('isExpanded', false);
        this._teardownClickHandler();
      }
    });
  },
  
  _teardownClickHandler() {
    $(document).off(`click.${this.elementId}`);
  },
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle'
});

styles.app.css

body {
  margin: 12px 16px;
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  font-size: 12pt;
}

.my-component button {
  height: 30px;
  width: 100%;
}

templates.application.hbs

{{#my-component as |c|}}
	{{c.trigger}}
  {{#c.body}}
  	Hello World
  {{/c.body}}
{{/my-component}}

<hr>

{{#my-component as |c|}}
	{{c.trigger}}
  {{#c.body}}
  	Hello World
  {{/c.body}}
{{/my-component}}

<hr>

{{#my-component as |c|}}
	{{c.trigger}}
  {{#c.body}}
  	Hello World
  {{/c.body}}
{{/my-component}}

templates.components.my-component-body.hbs

{{#if isExpanded}}
	{{yield}}
{{/if}}

templates.components.my-component-trigger.hbs

{{if isExpanded 'Collapse' 'Expand'}}

templates.components.my-component.hbs

{{yield (hash
	trigger=(component 'my-component-trigger' isExpanded=isExpanded click=(action 'toggle'))
  body=(component 'my-component-body' isExpanded=isExpanded)
)}}

twiddle.json

{
  "version": "0.12.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.12.0",
    "ember-template-compiler": "2.12.0",
    "ember-testing": "2.12.0"
  },
  "addons": {
    "ember-data": "2.12.1"
  }
}