Exploring components

components.child-c.js

import Ember from 'ember';

export default Ember.Component.extend({
  
  classNames: ['child-c'],
  
  classNameBindings: ['dashed'],
  
  dashed: false,
  
  value: null,
  
  // https://guides.emberjs.com/v2.2.0/components/the-component-lifecycle/
  didInsertElement: function() {
    this._super(...arguments);
    this._log('didInsertElement');
  },
  
  didRender: function() {
    this._super(...arguments);
    this._log('didRender');
  },
  
  didUpdate: function() {
    this._super(...arguments);
    this._log('didUpdate');
  },
  
  _log: function(hookName) {
    let value = this.get('value');
    Ember.Logger.log('child-c', hookName, value);
  },
  
  actions: {
    
    toggleCSSClass: function() {
      this.toggleProperty('dashed');
    }
    
  }
  
});

components.parent-c.js

import Ember from 'ember';

export default Ember.Component.extend({

  classNames: ['parent-c'],
  
  didInsertElement: function() {
	  this._super(...arguments);
    Ember.Logger.log('parent-c didInsertElement');
  }
                                      
});

controllers.application.js

import Ember from 'ember';

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

styles.app.css

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

.parent-c,
.child-c {
  border: 1px solid #000;
}

.parent-c {
  padding: 2px;
}

.child-c {
  margin: 5px;
  padding: 5px;
}

.dashed {
  border: 1px dashed blue;
}

templates.application.hbs

<h1>Exploring components</h1>

<p>
Ember 2.2.2 See twiddle.json for more info
</p>

<p>
Open the developer console to see the logs.
</p>

{{parent-c}}

<br>
<hr>
<br>

Expected console output:

<pre>
child-c didRender 1
child-c didInsertElement 2
child-c didRender 2
child-c didInsertElement 3
child-c didRender 3
parent-c didInsertElement
</pre>

{{outlet}}
<br>
<br>

templates.components.child-c.hbs

 
<b>{{value}}</b>
&nbsp;
<button {{action "toggleCSSClass"}}>toggle CSS class</button>

templates.components.parent-c.hbs

{{child-c value=1}}
{{child-c value=2}}
{{child-c value=3}}

twiddle.json

{
  "version": "0.10.4",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.2.2",
    "ember-data": "2.7.0",
    "ember-template-compiler": "2.2.2"
  },
  "addons": {}
}