Component Life Cycles

application.controller.js

import Ember from 'ember';

export default Ember.Controller.extend({

  appName:'Component Life-cycle Hooks',
  
  myAttr: "Red"

});

application.template.hbs

<h1>{{appName}}</h1>
{{life-cycles
	myAttr=myAttr
  setAttr=(action (mut myAttr))}}

life-cycles.component.js

import Ember from 'ember';

export default Ember.Component.extend({
  
  myProp: null,
  
  /**
  @didInitAttrs()
  
  Runs after a component was created and passed attrs are guaranteed to be present. In Ember 1.13, the attributes will be available as this.get('attrName').
  
  - Runs 1st on initial render
  - Setting internal component properties in this hook is ok (does not trigger warning/deprecation)
  
  */
  didInitAttrs() {
    console.log('didInitAttrs');
  },
  
  /**
  @didUpdateAttrs()
  
  runs when the attributes of a component have changed (but not when the component is re-rendered, via component.rerender, component.set, or changes in models or services used by the template).
  
  - Runs 1st on re-renders, when an external attr has changed
  - Does not Run when an internal property is set()
  - Setting properties in this hook is ok (does not trigger warning/deprecation)
  
  */
  didUpdateAttrs() {
    console.log('didUpdateAttrs');
  },
  
  /**
  @didReceiveAttrs()
  
  - Runs 2nd after didInitAttrs, on initial render
  - Runs 2nd on re-renders, when an external attr has changed
  - Does not Run when an internal property is set()
  - Setting properties in this hook is ok (does not trigger warning/deprecation)
  
  */
  didReceiveAttrs() {
    console.log('didReceiveAttrs');
  },
  
  /**
  @didInsertElement()
  
  runs after the template has rendered and the element is in the DOM.
  
  - Runs 4th only on initial render
  - Setting properties in this hook which would result in a template re-render is NOT ok (triggers warning/deprecation)
  
  */
  didInsertElement() {
    console.log('didInsertElement');
  },
  
  /**
  @willUpdate()
  
  runs when the component is re-rendering for any reason, including component.rerender(), component.set() or changes in models or services used by the template.
  
  - Runs 3rd, on re-renders, when an external attr has changed
  - Runs 1st, on re-renders, when an internal prop has changed
  - Setting properties in this hook is ok (does not trigger warning/deprecation)
  
  */
  willUpdate() {
    console.log('willUpdate');
  },
  
  /**
  @willRender()
  
  Runs before the template is rendered. It runs when the template is updated for any reason (both initial and re-render, and regardless of whether the change was caused by an attrs change or re-render).
  
  - Runs 3rd on initial render
  - Runs 4th on re-renders, when an external attr has changed
  - Runs 2nd on re-renders, when an internal prop has changed
  - Setting properties in this hook is ok (does not trigger warning/deprecation)
  
  */
  willRender() {
    console.log('willRender');
  },
  
  /**
  @didUpdate()
  
  runs after the template has re-rendered and the DOM is now up to date.
  
  - Runs 5th on re-renders, when an external attr has changed
  - Runs 3rd on re-renders, when an internal prop has changed
  - Setting properties in this hook which would result in a template re-render is NOT ok (triggers warning/deprecation)
  
  */
  didUpdate() {
    console.log('didUpdate');
  },
  
    /**
  @didRender()
  
  runs after didInsertElement (it also runs on subsequent re-renders).
  
  - Always runs last
  - Setting properties in this hook which would result in a template re-render is NOT ok (triggers warning/deprecation)
  
  */
  didRender() {
  	console.log('didRender');
    console.log('----------------------');
  },
  
});

life-cycles.template.hbs

<p>External Attr: {{myAttr}}</p>

<p>Internal Prop: {{myProp}}</p>

<div>
	<button onclick={{action setAttr "Blue" on="click"}}>Set Attr</button>
	<button onclick={{action (mut myProp) "Green"}}>Set Prop</button>
</div>

twiddle.json

{
  "version": "0.4.16",
  "EmberENV": {
    "FEATURES": {}
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.1.0/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.1.0/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.1.0/ember-template-compiler.js"
  }
}