Ember 3.15

components.list-item\.js

import Component from '@ember/component';
import { action } from '@ember/object';
import { tracked } from '@glimmer/tracking';

export default class extends Component {
  
  @tracked hovered = false;
  
  @action
 	handleMouseEnter(e) {
 		
 		this.hovered = true;
 	}

  @action
 	handleMouseLeave(e) {
 		
 		this.hovered = false;
 	}

 	didInsertElement() {
                      
 		super.didInsertElement(...arguments);
 		this.element.addEventListener('mouseenter', this.handleMouseEnter);
 		this.element.addEventListener('mouseleave', this.handleMouseLeave);
  }

 	willDestroyElement() {
    
 		super.willDestroyElement(...arguments);
 		this.element.removeEventListener('mouseenter', this.handleMouseEnter);
    this.element.removeEventListener('mouseleave', this.handleMouseLeave);
 	}
  
}

components.old-list-item\.js

import Component from '@ember/component';
import { set, get } from '@ember/object';

export default Component.extend({

  hovered: false,
  
  mouseEnter() {
		set(this, 'hovered', true);
	},

	mouseLeave() {
		set(this, 'hovered', false);
	}

});

controllers.application\.js

import Controller from '@ember/controller';

export default class ApplicationController extends Controller {
  appName = 'Ember Twiddle';

	arrayList =[{"name":"\"><script /><style/onload=prompt``>"},{"name":"arunteam"},{"name":"Selvaraj K"},{"name":"Renugadevi"},{"name":"arun"},{"name":"Raafi"},{"name":"N.Balaji"},{"name":"vamsi"},{"name":"శ్రీనిథీ"},{"name":"Ram Chiranjeevi"},{"name":"N.Balaji"},{"name":"బాలాజీ"},{"name":"sowmya.tp"},{"name":"[email protected]"},{"name":"rahul kumar singh"},{"name":"Srinithi"},{"name":"ravindranbg"},{"name":"[email protected]"},{"name":"Ram Chiranjeevi"},{"name":"wertt"},{"name":"qewrteryt"},{"name":"test"},{"name":"testwe"},{"name":"only member"},{"name":"d"},{"name":"Group test 123"},{"name":"wqer"},{"name":"test1"},{"name":"dsfs"},{"name":"123"},{"name":"test groupsss"},{"name":"\"><script /><style/onload=prompt``>"},{"name":"Ganesha"},{"name":"final"},{"name":"test balaji"},{"name":"rgfdsa"},{"name":"test activity"},{"name":"grefd"},{"name":"Enable groups ?"},{"name":"hdhdhdh"},{"name":"1234"},{"name":"testtt"},{"name":"Automation"},{"name":"Group with me as Admin"},{"name":"Testing foo Team Drive."},{"name":"fgesg"},{"name":"pls sir"},{"name":"testing groups123"},{"name":"234444"},{"name":"3434"},{"name":"sss"},{"name":"testdd"},{"name":"Analysis"},{"name":"hgjk"},{"name":"just me"},{"name":"ww"},{"name":"gtgfdsa"},{"name":"why"},{"name":"Final12345ty"},
             
             {"name":"\"><script /><style/onload=prompt``>"},{"name":"arunteam"},{"name":"Selvaraj K"},{"name":"Renugadevi"},{"name":"arun"},{"name":"Raafi"},{"name":"N.Balaji"},{"name":"vamsi"},{"name":"శ్రీనిథీ"},{"name":"Ram Chiranjeevi"},{"name":"N.Balaji"},{"name":"బాలాజీ"},{"name":"sowmya.tp"},{"name":"[email protected]"},{"name":"rahul kumar singh"},{"name":"Srinithi"},{"name":"ravindranbg"},{"name":"[email protected]"},{"name":"Ram Chiranjeevi"},{"name":"wertt"},{"name":"qewrteryt"},{"name":"test"},{"name":"testwe"},{"name":"only member"},{"name":"d"},{"name":"Group test 123"},{"name":"wqer"},{"name":"test1"},{"name":"dsfs"},{"name":"123"},{"name":"test groupsss"},{"name":"\"><script /><style/onload=prompt``>"},{"name":"Ganesha"},{"name":"final"},{"name":"test balaji"},{"name":"rgfdsa"},{"name":"test activity"},{"name":"grefd"},{"name":"Enable groups ?"},{"name":"hdhdhdh"},{"name":"1234"},{"name":"testtt"},{"name":"Automation"},{"name":"Group with me as Admin"},{"name":"Testing foo Team Drive."},{"name":"fgesg"},{"name":"pls sir"},{"name":"testing groups123"},{"name":"234444"},{"name":"3434"},{"name":"sss"},{"name":"testdd"},{"name":"Analysis"},{"name":"hgjk"},{"name":"just me"},{"name":"ww"},{"name":"gtgfdsa"},{"name":"why"},{"name":"Final12345ty"},
             
             {"name":"\"><script /><style/onload=prompt``>"},{"name":"arunteam"},{"name":"Selvaraj K"},{"name":"Renugadevi"},{"name":"arun"},{"name":"Raafi"},{"name":"N.Balaji"},{"name":"vamsi"},{"name":"శ్రీనిథీ"},{"name":"Ram Chiranjeevi"},{"name":"N.Balaji"},{"name":"బాలాజీ"},{"name":"sowmya.tp"},{"name":"[email protected]"},{"name":"rahul kumar singh"},{"name":"Srinithi"},{"name":"ravindranbg"},{"name":"[email protected]"},{"name":"Ram Chiranjeevi"},{"name":"wertt"},{"name":"qewrteryt"},{"name":"test"},{"name":"testwe"},{"name":"only member"},{"name":"d"},{"name":"Group test 123"},{"name":"wqer"},{"name":"test1"},{"name":"dsfs"},{"name":"123"},{"name":"test groupsss"},{"name":"\"><script /><style/onload=prompt``>"},{"name":"Ganesha"},{"name":"final"},{"name":"test balaji"},{"name":"rgfdsa"},{"name":"test activity"},{"name":"grefd"},{"name":"Enable groups ?"},{"name":"hdhdhdh"},{"name":"1234"},{"name":"testtt"},{"name":"Automation"},{"name":"Group with me as Admin"},{"name":"Testing foo Team Drive."},{"name":"fgesg"},{"name":"pls sir"},{"name":"testing groups123"},{"name":"234444"},{"name":"3434"},{"name":"sss"},{"name":"testdd"},{"name":"Analysis"},{"name":"hgjk"},{"name":"just me"},{"name":"ww"},{"name":"gtgfdsa"},{"name":"why"},{"name":"Final12345ty"},
             
             {"name":"\"><script /><style/onload=prompt``>"},{"name":"arunteam"},{"name":"Selvaraj K"},{"name":"Renugadevi"},{"name":"arun"},{"name":"Raafi"},{"name":"N.Balaji"},{"name":"vamsi"},{"name":"శ్రీనిథీ"},{"name":"Ram Chiranjeevi"},{"name":"N.Balaji"},{"name":"బాలాజీ"},{"name":"sowmya.tp"},{"name":"[email protected]"},{"name":"rahul kumar singh"},{"name":"Srinithi"},{"name":"ravindranbg"},{"name":"[email protected]"},{"name":"Ram Chiranjeevi"},{"name":"wertt"},{"name":"qewrteryt"},{"name":"test"},{"name":"testwe"},{"name":"only member"},{"name":"d"},{"name":"Group test 123"},{"name":"wqer"},{"name":"test1"},{"name":"dsfs"},{"name":"123"},{"name":"test groupsss"},{"name":"\"><script /><style/onload=prompt``>"},{"name":"Ganesha"},{"name":"final"},{"name":"test balaji"},{"name":"rgfdsa"},{"name":"test activity"},{"name":"grefd"},{"name":"Enable groups ?"},{"name":"hdhdhdh"},{"name":"1234"},{"name":"testtt"},{"name":"Automation"},{"name":"Group with me as Admin"},{"name":"Testing foo Team Drive."},{"name":"fgesg"},{"name":"pls sir"},{"name":"testing groups123"},{"name":"234444"},{"name":"3434"},{"name":"sss"},{"name":"testdd"},{"name":"Analysis"},{"name":"hgjk"},{"name":"just me"},{"name":"ww"},{"name":"gtgfdsa"},{"name":"why"},{"name":"Final12345ty"},
             
             {"name":"\"><script /><style/onload=prompt``>"},{"name":"arunteam"},{"name":"Selvaraj K"},{"name":"Renugadevi"},{"name":"arun"},{"name":"Raafi"},{"name":"N.Balaji"},{"name":"vamsi"},{"name":"శ్రీనిథీ"},{"name":"Ram Chiranjeevi"},{"name":"N.Balaji"},{"name":"బాలాజీ"},{"name":"sowmya.tp"},{"name":"[email protected]"},{"name":"rahul kumar singh"},{"name":"Srinithi"},{"name":"ravindranbg"},{"name":"[email protected]"},{"name":"Ram Chiranjeevi"},{"name":"wertt"},{"name":"qewrteryt"},{"name":"test"},{"name":"testwe"},{"name":"only member"},{"name":"d"},{"name":"Group test 123"},{"name":"wqer"},{"name":"test1"},{"name":"dsfs"},{"name":"123"},{"name":"test groupsss"},{"name":"\"><script /><style/onload=prompt``>"},{"name":"Ganesha"},{"name":"final"},{"name":"test balaji"},{"name":"rgfdsa"},{"name":"test activity"},{"name":"grefd"},{"name":"Enable groups ?"},{"name":"hdhdhdh"},{"name":"1234"},{"name":"testtt"},{"name":"Automation"},{"name":"Group with me as Admin"},{"name":"Testing foo Team Drive."},{"name":"fgesg"},{"name":"pls sir"},{"name":"testing groups123"},{"name":"234444"},{"name":"3434"},{"name":"sss"},{"name":"testdd"},{"name":"Analysis"},{"name":"hgjk"},{"name":"just me"},{"name":"ww"},{"name":"gtgfdsa"},{"name":"why"},{"name":"Final12345ty"},
             
             {"name":"\"><script /><style/onload=prompt``>"},{"name":"arunteam"},{"name":"Selvaraj K"},{"name":"Renugadevi"},{"name":"arun"},{"name":"Raafi"},{"name":"N.Balaji"},{"name":"vamsi"},{"name":"శ్రీనిథీ"},{"name":"Ram Chiranjeevi"},{"name":"N.Balaji"},{"name":"బాలాజీ"},{"name":"sowmya.tp"},{"name":"[email protected]"},{"name":"rahul kumar singh"},{"name":"Srinithi"},{"name":"ravindranbg"},{"name":"[email protected]"},{"name":"Ram Chiranjeevi"},{"name":"wertt"},{"name":"qewrteryt"},{"name":"test"},{"name":"testwe"},{"name":"only member"},{"name":"d"},{"name":"Group test 123"},{"name":"wqer"},{"name":"test1"},{"name":"dsfs"},{"name":"123"},{"name":"test groupsss"},{"name":"\"><script /><style/onload=prompt``>"},{"name":"Ganesha"},{"name":"final"},{"name":"test balaji"},{"name":"rgfdsa"},{"name":"test activity"},{"name":"grefd"},{"name":"Enable groups ?"},{"name":"hdhdhdh"},{"name":"1234"},{"name":"testtt"},{"name":"Automation"},{"name":"Group with me as Admin"},{"name":"Testing foo Team Drive."},{"name":"fgesg"},{"name":"pls sir"},{"name":"testing groups123"},{"name":"234444"},{"name":"3434"},{"name":"sss"},{"name":"testdd"},{"name":"Analysis"},{"name":"hgjk"},{"name":"just me"},{"name":"ww"},{"name":"gtgfdsa"},{"name":"why"},{"name":"Final12345ty"},
             
             {"name":"\"><script /><style/onload=prompt``>"},{"name":"arunteam"},{"name":"Selvaraj K"},{"name":"Renugadevi"},{"name":"arun"},{"name":"Raafi"},{"name":"N.Balaji"},{"name":"vamsi"},{"name":"శ్రీనిథీ"},{"name":"Ram Chiranjeevi"},{"name":"N.Balaji"},{"name":"బాలాజీ"},{"name":"sowmya.tp"},{"name":"[email protected]"},{"name":"rahul kumar singh"},{"name":"Srinithi"},{"name":"ravindranbg"},{"name":"[email protected]"},{"name":"Ram Chiranjeevi"},{"name":"wertt"},{"name":"qewrteryt"},{"name":"test"},{"name":"testwe"},{"name":"only member"},{"name":"d"},{"name":"Group test 123"},{"name":"wqer"},{"name":"test1"},{"name":"dsfs"},{"name":"123"},{"name":"test groupsss"},{"name":"\"><script /><style/onload=prompt``>"},{"name":"Ganesha"},{"name":"final"},{"name":"test balaji"},{"name":"rgfdsa"},{"name":"test activity"},{"name":"grefd"},{"name":"Enable groups ?"},{"name":"hdhdhdh"},{"name":"1234"},{"name":"testtt"},{"name":"Automation"},{"name":"Group with me as Admin"},{"name":"Testing foo Team Drive."},{"name":"fgesg"},{"name":"pls sir"},{"name":"testing groups123"},{"name":"234444"},{"name":"3434"},{"name":"sss"},{"name":"testdd"},{"name":"Analysis"},{"name":"hgjk"},{"name":"just me"},{"name":"ww"},{"name":"gtgfdsa"},{"name":"why"},{"name":"Final12345ty"},
             
             {"name":"\"><script /><style/onload=prompt``>"},{"name":"arunteam"},{"name":"Selvaraj K"},{"name":"Renugadevi"},{"name":"arun"},{"name":"Raafi"},{"name":"N.Balaji"},{"name":"vamsi"},{"name":"శ్రీనిథీ"},{"name":"Ram Chiranjeevi"},{"name":"N.Balaji"},{"name":"బాలాజీ"},{"name":"sowmya.tp"},{"name":"[email protected]"},{"name":"rahul kumar singh"},{"name":"Srinithi"},{"name":"ravindranbg"},{"name":"[email protected]"},{"name":"Ram Chiranjeevi"},{"name":"wertt"},{"name":"qewrteryt"},{"name":"test"},{"name":"testwe"},{"name":"only member"},{"name":"d"},{"name":"Group test 123"},{"name":"wqer"},{"name":"test1"},{"name":"dsfs"},{"name":"123"},{"name":"test groupsss"},{"name":"\"><script /><style/onload=prompt``>"},{"name":"Ganesha"},{"name":"final"},{"name":"test balaji"},{"name":"rgfdsa"},{"name":"test activity"},{"name":"grefd"},{"name":"Enable groups ?"},{"name":"hdhdhdh"},{"name":"1234"},{"name":"testtt"},{"name":"Automation"},{"name":"Group with me as Admin"},{"name":"Testing foo Team Drive."},{"name":"fgesg"},{"name":"pls sir"},{"name":"testing groups123"},{"name":"234444"},{"name":"3434"},{"name":"sss"},{"name":"testdd"},{"name":"Analysis"},{"name":"hgjk"},{"name":"just me"},{"name":"ww"},{"name":"gtgfdsa"},{"name":"why"},{"name":"Final12345ty"}]

}

templates.application\.hbs

<h1>Ember 3.15</h1> 
<br>

<hr>

<h2>Total Items : {{arrayList.length}} </h2>
<hr>

<br>
<br>

{{#each arrayList as |item| }}

  {{old-list-item user=item.name}} <br>
{{/each}}
  

{{outlet}}
<br>
<br>

templates.components.list-item\.hbs

<div>
{{#if hovered}}

<div style="background-color:yellow; padding:100">
 	 <li> {{@user}} </li>
</div>

{{else}} 

      {{@user}}
{{/if}}
</div>

templates.components.old-list-item\.hbs

<div>
{{#if hovered}}

<div style="background-color:tomato; padding:100">
 	 <li> {{user}} </li>
</div>
{{else}} 

      {{user}}
{{/if}}
</div>

twiddle\.json

{
  "version": "0.17.1",
  "EmberENV": {
    "FEATURES": {},
    "_TEMPLATE_ONLY_GLIMMER_COMPONENTS": false,
    "_APPLICATION_TEMPLATE_WRAPPER": true,
    "_JQUERY_INTEGRATION": true
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.js",
    "ember": "3.15.0",
    "ember-template-compiler": "3.15.0",
    "ember-testing": "3.15.0"
  },
  "addons": {
    "@glimmer/component": "1.0.0",
    "ember-data": "3.15.1"
  }
}