Contextual component examples

components.child-component.js

import Ember from 'ember';

export default Ember.Component.extend({
  classNames: ['green']
});

components.parent-component-multiple-yield.js

import Ember from 'ember';

export default Ember.Component.extend({
  classNames: ['red'],
  
  foo: 'Parent component context',
  
  firstContext: 'First context',
  secondContext: 'Second context',
  thirdContext: 'Third context',
});

components.parent-component.js

import Ember from 'ember';

export default Ember.Component.extend({
  classNames: ['red'],
  
  foo: 'Parent component context'
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  
  foo: 'Application controller context',
  
  bar: 'Application controller context'
});

styles.app.css

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

div {
 padding: 10px; 
  margin: 10px;
}

.red {
 	background-color: red; 
}

.green {
	background-color: green;
}

.yellow {
	background-color: yellow;
}

.cyan {
	background-color: cyan;
}

templates.application.hbs

<h1>1. Parent component by itself</h1>
{{parent-component}}

<h1>2. Child component by itself</h1>
{{child-component}}

<h1>3. Parent component containing hbs (no context)</h1>
{{#parent-component}}
  <div class="cyan">
    Some hbs code
  </div>
{{/parent-component}}

<h1>4. Parent component containing hbs (controller context)</h1>
{{#parent-component}}
  <div class="cyan">
    Some hbs code<br/>
    Foo: {{foo}}
  </div>
{{/parent-component}}

<h1>5. Parent component containing hbs (parent component context)</h1>
{{#parent-component as |foo|}}
  <div class="cyan">
    Some hbs code<br/>
    Foo: {{foo}}<br/>
    Bar: {{bar}}
  </div>
{{/parent-component}}

<h1>6. Parent component containing child component (no context)</h1>
{{#parent-component}}
  {{child-component}}
{{/parent-component}}

<h1>7. Parent component containing child component (controller context)</h1>
{{#parent-component}}
  {{child-component foo=foo}}
{{/parent-component}}

<h1>8. Parent component containing child component (parent component context)</h1>
{{#parent-component as |foo|}}
  {{child-component foo=foo}}
{{/parent-component}}

<h1>9. Yield being used multiple times</h1>
{{#parent-component-multiple-yield}}
 {{child-component}}
{{/parent-component-multiple-yield}}

<h1>10. Yielding a child component w/o override</h1>
{{#parent-component as |notUsed api|}}
  {{api.childComponent}}
{{/parent-component}}

<h1>11. Yielding a child component w/ override</h1>
{{#parent-component as |notUsed api|}}
  {{api.childComponent foo='Override!'}}
{{/parent-component}}

templates.components.child-component.hbs

Some context in the child component <br/>
{{#if foo}}
<strong>Context received:</strong>{{foo}}
{{/if}}

templates.components.parent-component-multiple-yield.hbs

Some context in the parent component
<div class="yellow">
First Yield
{{yield firstContext}}
</div>
<div class="yellow">
Second Yield
{{yield secondContext}}
</div>
<div class="yellow">
Third Yield
{{yield thirdContext}}
</div>
<div class="yellow">
Fourth Yield (reusing first context)
{{yield firstContext}}
</div>

templates.components.parent-component.hbs

Some context in the parent context
{{yield foo}}

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"
  }
}