<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">

<head>
    <title>DevExtreme Demo</title>
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0" />
    <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/17.2.3/css/dx.spa.css" />
    <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/17.2.3/css/dx.common.css" />
    <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/17.2.3/css/dx.light.css" />

    <script src="https://unpkg.com/core-js@2.4.1/client/shim.min.js"></script>
    <script src="https://unpkg.com/zone.js@0.6.25/dist/zone.js"></script>
    <script src="https://unpkg.com/reflect-metadata@0.1.3/Reflect.js"></script>
    <script src="https://unpkg.com/systemjs@0.19.31/dist/system.js"></script>

    <script src="config.js"></script>
    <script>
        System.import('app')
            .then(function(viz) {
                System.import("devextreme/viz/themes").then(function(viz) {
                    viz.currentTheme("generic.light");
                    viz.refreshTheme();
                });
            })
            .catch(console.error.bind(console));
    </script>

</head>

<body class="dx-viewport">
    <div class="demo-container">
        <demo-app>Loading...</demo-app>
    </div>
</body>

</html>
// In real applications, you should not transpile code in the browser. You can see how to create your own application with Angular and DevExtreme here:
// https://github.com/DevExpress/devextreme-angular/blob/master/README.md

System.config({
    transpiler: 'ts',
    typescriptOptions: {
        module: "commonjs",
        emitDecoratorMetadata: true,
        experimentalDecorators: true
    },
    meta: {
        'typescript': {
            "exports": "ts"
        }
    },
    paths: {
        'npm:': 'https://unpkg.com/'
    },
    map: {
        'ts': 'npm:plugin-typescript@7.0.6/lib/plugin.js',
        'typescript': 'npm:typescript@2.2.2/lib/typescript.js',

        '@angular/core': 'npm:@angular/core@4.1.0/bundles/core.umd.js',
        '@angular/common': 'npm:@angular/common@4.1.0/bundles/common.umd.js',
        '@angular/compiler': 'npm:@angular/compiler@4.1.0/bundles/compiler.umd.js',
        '@angular/platform-browser': 'npm:@angular/platform-browser@4.1.0/bundles/platform-browser.umd.js',
        '@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic@4.1.0/bundles/platform-browser-dynamic.umd.js',
        '@angular/http': 'npm:@angular/http@4.1.0/bundles/http.umd.js',
        '@angular/router': 'npm:@angular/router@4.1.0/bundles/router.umd.js',
        '@angular/forms': 'npm:@angular/forms@4.1.0/bundles/forms.umd.js',

        'rxjs': 'npm:rxjs@5.3.1',

        'devextreme': 'npm:devextreme@17.2',
        'jszip': 'npm:jszip@3.1.3/dist/jszip.min.js',
        'jquery': 'npm:jquery@3.1.1/dist/jquery.min.js',
        'devextreme-angular': 'npm:devextreme-angular@17.2'
    },
    packages: {
        'app': {
            main: './app.component.ts',
            defaultExtension: 'ts'
        },
        'devextreme': {
            defaultExtension: 'js'
        },
        'devextreme-angular': {
            main: 'index.js',
            defaultExtension: 'js'
        }
    }
});
<div id="accordion">
  
  <dx-button text="Change Data" type="normal" (onClick)="CopyData()"></dx-button>
  <br>
  
  <h2>Empty Accordion</h2>
    <dx-accordion
        #accordion
        [dataSource]=companies.JobsEmpty
        [collapsible]="true"
        [multiple]="true"
        [animationDuration]="300"
        [selectedIndex]=-1
        [deferRendering]="true">
        <div *dxTemplate="let company of 'title'">
            <h1>{{company.CompanyName}}</h1>
        </div>
        <div *dxTemplate="let company of 'item'">
            <div>
                <p>
                    Detail
                </p>
            </div>
        </div>
    </dx-accordion>
</div>
<dx-button text="AddRowToEmptyAccordion" type="normal" (onClick)="AddRowToEmpty()"></dx-button>
<br>
<br>
<div id="accordion">
  <h2>Filled Accordion</h2>
    <dx-accordion
        #accordion1
        [dataSource]=companies.Jobs
        [collapsible]="true"
        [multiple]="true"
        [animationDuration]="300"
        [selectedIndex]=-1
        [deferRendering]="true">
        <div *dxTemplate="let company of 'title'">
            <h1>{{company.CompanyName}}</h1>
        </div>
        <div *dxTemplate="let company of 'item'">
            <div>
                <p>
                    Detail
                </p>
            </div>
        </div>
    </dx-accordion>
</div>
<dx-button text="AddRowToEmptyAccordion" type="normal" (onClick)="AddRow()"></dx-button>
 

import { NgModule, Component, enableProdMode } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';

import { DxAccordionModule,DxButtonModule, DxCheckBoxModule, DxSliderModule, DxTagBoxModule, DxTemplateModule } from 'devextreme-angular';

import { Company, Service } from './app.service';

if(!/localhost/.test(document.location.host)) {
    enableProdMode();
}

@Component({
    selector: 'demo-app',
    templateUrl: 'app/app.component.html',
    styleUrls: ['app/app.component.css'],
    providers: [Service]
})
export class AppComponent {
    companies: any= null;

  
    constructor(service: Service) {

        let data =      {
                        Name :"test",
                        Jobs :
                                [{
                                    "ID": 1,
                                    "CompanyName": "name1"
                                }, 
                                {
                                    "ID": 2,
                                    "CompanyName": "name2"
                                }],
                        JobsEmpty:[]
                        };
        
        this.companies = data;
                        
    }
    
    
    CopyData()
    {
      
       let newData =      {
                             Name :"testNewData",
                              Jobs :
                                [{
                                    "ID": 3,
                                    "CompanyName": "name3"
                                }, 
                                {
                                    "ID": 4,
                                    "CompanyName": "name4"
                                }],
                              JobsEmpty:[]
                          };
        
        this.companies = newData;
      
    }
    
    AddRowToEmpty()
    {
        console.log('Add data')
        
        this.companies.JobsEmpty.push({"ID": 5,"CompanyName": "NEW ELEMENT"}) 
        
    }
    AddRow()
    {
        console.log('Add data')
        
        this.companies.Jobs.push({"ID": 5,"CompanyName": "NEW ELEMENT"}) 
        
    }
}

@NgModule({
    imports: [
        BrowserModule,
        DxAccordionModule,
        DxCheckBoxModule,
        DxSliderModule,
        DxTagBoxModule,
        DxTemplateModule,
        DxButtonModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent]
})
export class AppModule { }

platformBrowserDynamic().bootstrapModule(AppModule);
import { Injectable } from '@angular/core';




@Injectable()
export class Service {
    getCompanies(): Company[] {
        return companies;
    }
}
/deep/ #accordion h1 {
    font-size: 20px;
}
/deep/ .options,
/deep/ .selected-data {    
    padding: 20px;
    background-color: rgba(191, 191, 191, 0.15);
    margin-top: 20px;
}
/deep/ .selected-data {
    position: relative;
    height: 36px;
}
/deep/ .selected-data > .caption {
    position: relative;
    top: 5px;
    margin-right: 10px;
    font-weight: bold;
    font-size: 115%;
}
/deep/ .selected-data > .dx-widget {
    position: absolute;
    left: 140px;
    right: 20px;
    top: 20px;    
}
/deep/ .options > .caption {
    font-weight: 500;
    font-size: 18px;
}
/deep/ .option {
    margin-top: 10px;
}