Hold state from context switching

controllers.application.js

import Ember from 'ember';

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

router.js

import Ember from 'ember';
import config from './config/environment';

const Router = Ember.Router.extend({
  location: 'none',
  rootURL: config.rootURL
});

Router.map(function() {
  this.route('parent', function() {
    this.route('a');
    this.route('b');
  })
});

export default Router;

routes.parent.a.js

import Ember from 'ember';

export default Ember.Route.extend({
  model() {
    // 每次进入此路由的时候，获取来自 parent 的 state
    let formState = this.modelFor('parent');
    
    // 然后作为自己的 state 返回
    return formState;
  }
});

routes.parent.b.js

import Ember from 'ember';

export default Ember.Route.extend({
  model() {
    // child.b 也可以做同样的事情，当然也可以有自己的 state
    let formState = this.modelFor('parent');
    
    return {
      form: formState, // 这是来自于 parent 的
      self: 'child.b'  // 这是自己的
    }
  }
});

routes.parent.js

import Ember from 'ember';

export default Ember.Route.extend({
  model() {
    // 准备一个状态来映射存在于 parent.a 下的表单：
    return [
      {id: 'foo', type: 'text', value: null},
      {id: 'bar', type: 'text', value: null}
    ];
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
{{link-to "parent.a" "parent.a"}} | {{link-to "parent.b" "parent.b"}}
<br>
{{outlet}}
<br>
<br>

templates.parent.a.hbs

<hr>

{{#each model as |field|}}
  <div>{{input id=field.id type=field.type value=field.value}}</div>
{{/each}}

templates.parent.b.hbs

From Parent:

{{#each model.form as |field|}}
	<div>{{field.value}}</div>
{{/each}}

<hr>

From Self:

{{model.self}}

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"
  }
}