datachangeui

components.fruit-item.js

// import Ember from 'ember';

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

import Component from '@ember/component';
import { computed }  from '@ember/object';

export default Ember.Component.extend({
    tagName: 'li',
    classNames: ['item'],
    localClassNames: 'item',
    classNameBindings: ['active'],
    active: computed('choosed',function() {
        let {fruit,choosed}  = this.getProperties('fruit','choosed');

        if(fruit.id === choosed.id) {
            return true
        }
        return false
    }),
    onClick() {

    },
    click() {
        let fruit = this.get('fruit'),
            action = this.get('onClick');

            // console.log(fruit)
            console.log(this.get('choosed'))
        action(fruit);
    }
});

components.fruit-list.js

// import Ember from 'ember';

// export default Ember.Component.extend({
// });
import Component from '@ember/component';
import {A} from '@ember/array';
import EmberObject from '@ember/object';

export default Component.extend({
    choosed: EmberObject.create({name:'orange',value:1,id:'item2',count: 21}),
    tagName:'ul',
    items: A([
        {name:'apple',value:0,id:'item1',count: 3},
        {name:'orange',value:1,id:'item2',count: 21},
        {name:'banana',value:2,id:'item3',count: 1},
        {name:'watermelon',value:3,id:'item4',count: 4},
        {name:'cherry tomato',value:4,id:'item5',count: 4},
        {name:'nectarine',value:5,id:'item6',count: 9},

    ])
});

controllers.application.js

import Ember from 'ember';

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

styles.app.css

body {
  margin: 12px 16px;
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  font-size: 12pt;
}
ul {
    list-style: none;

}
ul .item {
  border: 1px solid #eee;
	cursor: pointer;
  height: 40px;
  line-height: 40px;
  padding: 0 20px;
  width: 220px;
}
ul .item.active {
  border: 1px solid lightblue;
  background-color: lightblue;
 }

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{fruit-list}}
{{outlet}}
<br>
<br>

templates.components.fruit-item.hbs

{{fruit.name}} and count is {{fruit.count}}

templates.components.fruit-list.hbs

{{#each items as |item|}}
    {{fruit-item fruit=item choosed=choosed onClick=(action (mut choosed))}}
{{/each}}

twiddle.json

{
  "version": "0.15.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.4.3",
    "ember-template-compiler": "3.4.3",
    "ember-testing": "3.4.3"
  },
  "addons": {
    "ember-data": "3.4.2"
  }
}