Orientation in React Tabs component

import * as React from 'react';
import * as ReactDOM from 'react-dom';
import { DropDownListComponent } from '@syncfusion/ej2-react-dropdowns';
import { TabComponent, TabItemDirective, TabItemsDirective } from '@syncfusion/ej2-react-navigations';
export default class ReactApp extends React.Component {
    constructor() {
        super(...arguments);
        this.headerText = [{ text: "HTML" }, { text: "C Sharp(C#)" }, { text: "Java" }, { text: "VB.Net" },
            { text: "Xamarin" }, { text: "ASP.NET" }, { text: "ASP.NET MVC" }, { text: "JavaScript" }];
        this.fields = { text: 'text', value: 'value' };
        this.headerData = [{ 'value': 'top', 'text': 'Top' }, { 'value': 'bottom', 'text': 'Bottom' },
            { 'value': 'left', 'text': 'Left' }, { 'value': 'right', 'text': 'Right' }];
        this.orientationData = [{ 'value': 'scrollable', 'text': 'Scrollable' }, { 'value': 'popup', 'text': 'Popup' }];
        this.hdrVal = 'top';
        this.orientationVal = 'scrollable';
    }
    changeOrientationMode(e) {
        let placement = document.getElementById('headerPosition').value;
        this.tabObj.headerPlacement = placement;
        this.tabObj.dataBind();
    }
    changeOverflowMode(e) {
        let placement = document.getElementById('orientation').value;
        this.tabObj.overflowMode = placement;
        this.tabObj.dataBind();
    }
    content0() {
        return <div>
  HyperText Markup Language, commonly referred to as HTML, is the standard markup
language used to create web pages. Along with CSS, and JavaScript, HTML is a cornerstone
technology, used by most websites to create visually engaging web pages, user interfaces
for web applications, and user interfaces for many mobile applications.[1] Web browsers
can read HTML files and render them into visible or audible web pages. HTML describes
the structure of a website semantically along with cues for presentation, making it a
markup language, rather than a programming language.
  </div>;
    }
    content1() {
        return <div>
   C# is intended to be a simple, modern, general-purpose, object-oriented programming language. Its development team is led by Anders Hejlsberg. The most recent version is C# 5.0, which was released on August 15, 2012.
  </div>;
    }
    content2() {
        return <div>
  Java is a set of computer software and specifications developed by Sun Microsystems, later acquired by Oracle
Corporation, that provides a system for developing application software and deploying it in a cross-platform computing
environment. Java is used in a wide variety of computing platforms from embedded devices and mobile phones to
enterprise servers and supercomputers. While less common, Java applets run in secure, sandboxed environments to
provide many features of native applications and can be embedded in HTML pages.
  </div>;
    }
    content3() {
        return <div>
The command-line compiler, VBC.EXE, is installed as part of the freeware .NET
Framework SDK. Mono also includes a command-line VB.NET compiler. The most recent version
is VB 2012, which was released on August 15, 2012.
  </div>;
    }
    content4() {
        return <div>
 Xamarin is a San Francisco, California based software company created in May
2011[3] by the engineers that created Mono,[4] Mono for Android and MonoTouch that are
cross-platform implementations of the Common Language Infrastructure (CLI) and Common
Language Specifications (often called Microsoft .NET). With a C#-shared codebase,developers
can use Xamarin tools to write native Android, iOS, and Windows apps with native user interfaces
and share code across multiple platforms.[5] Xamarin has over 1 million developers in more
than 120 countries around the World as of May 2015.
  </div>;
    }
    content5() {
        return <div>
ASP.NET is an open-source server-side web application framework designed for web
development to produce dynamic web pages. It was developed by Microsoft to allow programmers
to build dynamic web sites, web applications and web services. It was first released in January
2002 with version 1.0 of the .NET Framework, and is the successor to Microsoft Active Server
Pages (ASP) technology. ASP.NET is built on the Common Language Runtime (CLR), allowing
programmers to write ASP.NET code using any supported .NET language. The ASP.NET SOAP extension
framework allows ASP.NET components to process SOAP messages.
  </div>;
    }
    content6() {
        return <div>
The ASP.NET MVC is a web application framework developed by Microsoft, which implements
the model–view–controller (MVC) pattern. It is open-source software, apart from the ASP.NET Web
Forms component which is proprietary. In the later versions of ASP.NET, ASP.NET MVC, ASP.NET Web
API, and ASP.NET Web Pages (a platform using only Razor pages) will merge into a unified MVC 6.
The project is called ASP.NET vNext.
  </div>;
    }
    content7() {
        return <div>
JavaScript (JS) is an interpreted computer programming language. It was originally
implemented as part of web browsers so that client-side scripts could interact with the
user, control the browser, communicate asynchronously, and alter the document content that
was displayed.[5] More recently, however, it has become common in both game development
and the creation of desktop applications.
  </div>;
    }
    render() {
        return (<div>
    <div class='row' id='header'>
      <label> Header Position </label>
      <div>
        <DropDownListComponent id='headerPosition' dataSource={this.headerData} fields={this.fields} value={this.hdrVal} width={'150'} change={this.changeOrientationMode = this.changeOrientationMode.bind(this)}/>
      </div>
    </div>
    <div class='row' id='mode'>
      <label> Mode </label>
      <div>
        <DropDownListComponent id='orientation' dataSource={this.orientationData} fields={this.fields} value={this.orientationVal} width={'150'} change={this.changeOverflowMode = this.changeOverflowMode.bind(this)}/>
      </div>
    </div>
    <br /><br />
    <TabComponent id='default' heightAdjustMode='None' height={150} width='700' ref={tab => this.tabObj = tab}>
      <TabItemsDirective>
        <TabItemDirective header={this.headerText[0]} content={this.content0}/>
        <TabItemDirective header={this.headerText[1]} content={this.content1}/>
        <TabItemDirective header={this.headerText[2]} content={this.content2}/>
        <TabItemDirective header={this.headerText[3]} content={this.content3}/>
        <TabItemDirective header={this.headerText[4]} content={this.content4}/>
        <TabItemDirective header={this.headerText[5]} content={this.content5}/>
        <TabItemDirective header={this.headerText[6]} content={this.content6}/>
        <TabItemDirective header={this.headerText[7]} content={this.content7}/>
      </TabItemsDirective>
    </TabComponent>
  </div>);
    }
}
ReactDOM.render(<ReactApp />, document.getElementById('element'));

<!DOCTYPE html>
<html lang="en">

<head>
    <title>Syncfusion React Tab</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Essential JS 2 for React Components" />
    <meta name="author" content="Syncfusion" />
    <link href="//cdn.syncfusion.com/ej2/20.1.57/material.css" rel="stylesheet" />
    <link href="index.css" rel="stylesheet" /> 
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
</head>

<body>
    <div id='container'>
        <div id='element'>
                <div id='loader'>Loading</div>
        </div>
    </div>
</body>

</html>

import * as React from 'react';
import * as ReactDOM from 'react-dom';
import { ChangeEventArgs, DropDownListComponent } from '@syncfusion/ej2-react-dropdowns';
import { TabComponent, TabItemDirective, TabItemsDirective } from '@syncfusion/ej2-react-navigations';

export default class ReactApp extends React.Component<{}, {}> {
  public tabObj: TabComponent;

  public headerText: any = [{ text: "HTML" }, { text: "C Sharp(C#)" }, { text: "Java" }, { text: "VB.Net" },
  { text: "Xamarin" }, { text: "ASP.NET" },  { text: "ASP.NET MVC" }, { text: "JavaScript" }];

  public fields: object = { text: 'text', value: 'value' };

  public headerData: any = [{'value':'top', 'text': 'Top'}, {'value':'bottom', 'text': 'Bottom'},
  {'value':'left', 'text': 'Left'}, {'value':'right', 'text': 'Right'}];

  public orientationData: { [key: string]: Object }[] = [{'value':'scrollable', 'text': 'Scrollable'}, {'value':'popup', 'text': 'Popup'}];

  public hdrVal: string = 'top';

  public orientationVal: string = 'scrollable';

  public changeOrientationMode(e: ChangeEventArgs): void {
    let placement: string = (document.getElementById('headerPosition') as HTMLSelectElement).value;
    this.tabObj.headerPlacement = placement as any;
    this.tabObj.dataBind();
  }

  public changeOverflowMode(e: ChangeEventArgs): void {
    let placement: string = (document.getElementById('orientation') as HTMLSelectElement).value;
    this.tabObj.overflowMode = placement as any;
    this.tabObj.dataBind();
  }

  public content0() {
return <div>
  HyperText Markup Language, commonly referred to as HTML, is the standard markup
language used to create web pages. Along with CSS, and JavaScript, HTML is a cornerstone
technology, used by most websites to create visually engaging web pages, user interfaces
for web applications, and user interfaces for many mobile applications.[1] Web browsers
can read HTML files and render them into visible or audible web pages. HTML describes
the structure of a website semantically along with cues for presentation, making it a
markup language, rather than a programming language.
  </div>;
  }
  public content1() {
return <div>
   C# is intended to be a simple, modern, general-purpose, object-oriented programming language. Its development team is led by Anders Hejlsberg. The most recent version is C# 5.0, which was released on August 15, 2012.
  </div>;
  }
  public content2() {
return <div>
  Java is a set of computer software and specifications developed by Sun Microsystems, later acquired by Oracle
Corporation, that provides a system for developing application software and deploying it in a cross-platform computing
environment. Java is used in a wide variety of computing platforms from embedded devices and mobile phones to
enterprise servers and supercomputers. While less common, Java applets run in secure, sandboxed environments to
provide many features of native applications and can be embedded in HTML pages.
  </div>;
  }
public content3() {
return <div>
The command-line compiler, VBC.EXE, is installed as part of the freeware .NET
Framework SDK. Mono also includes a command-line VB.NET compiler. The most recent version
is VB 2012, which was released on August 15, 2012.
  </div>;
  }
  public content4() {
return <div>
 Xamarin is a San Francisco, California based software company created in May
2011[3] by the engineers that created Mono,[4] Mono for Android and MonoTouch that are
cross-platform implementations of the Common Language Infrastructure (CLI) and Common
Language Specifications (often called Microsoft .NET). With a C#-shared codebase,developers
can use Xamarin tools to write native Android, iOS, and Windows apps with native user interfaces
and share code across multiple platforms.[5] Xamarin has over 1 million developers in more
than 120 countries around the World as of May 2015.
  </div>;
  }
  public content5() {
return <div>
ASP.NET is an open-source server-side web application framework designed for web
development to produce dynamic web pages. It was developed by Microsoft to allow programmers
to build dynamic web sites, web applications and web services. It was first released in January
2002 with version 1.0 of the .NET Framework, and is the successor to Microsoft Active Server
Pages (ASP) technology. ASP.NET is built on the Common Language Runtime (CLR), allowing
programmers to write ASP.NET code using any supported .NET language. The ASP.NET SOAP extension
framework allows ASP.NET components to process SOAP messages.
  </div>;
  }
  public content6() {
return <div>
The ASP.NET MVC is a web application framework developed by Microsoft, which implements
the model–view–controller (MVC) pattern. It is open-source software, apart from the ASP.NET Web
Forms component which is proprietary. In the later versions of ASP.NET, ASP.NET MVC, ASP.NET Web
API, and ASP.NET Web Pages (a platform using only Razor pages) will merge into a unified MVC 6.
The project is called ASP.NET vNext.
  </div>;
  }
  public content7() {
return <div>
JavaScript (JS) is an interpreted computer programming language. It was originally
implemented as part of web browsers so that client-side scripts could interact with the
user, control the browser, communicate asynchronously, and alter the document content that
was displayed.[5] More recently, however, it has become common in both game development
and the creation of desktop applications.
  </div>;
  }

  public render() {
return (
  <div>
    <div class='row' id='header'>
      <label> Header Position </label>
      <div>
        <DropDownListComponent id='headerPosition' dataSource={this.headerData} fields={this.fields} value={this.hdrVal} width={'150'} change={this.changeOrientationMode = this.changeOrientationMode.bind(this)} />
      </div>
    </div>
    <div class='row' id='mode'>
      <label> Mode </label>
      <div>
        <DropDownListComponent id='orientation' dataSource={this.orientationData} fields={this.fields} value={this.orientationVal} width={'150'} change={this.changeOverflowMode = this.changeOverflowMode.bind(this)}  />
      </div>
    </div>
    <br /><br />
    <TabComponent id='default' heightAdjustMode='None' height={150} width= '700' ref={tab => this.tabObj = tab!}>
      <TabItemsDirective>
        <TabItemDirective header={this.headerText[0]} content={this.content0} />
        <TabItemDirective header={this.headerText[1]} content={this.content1} />
        <TabItemDirective header={this.headerText[2]} content={this.content2} />
        <TabItemDirective header={this.headerText[3]} content={this.content3} />
        <TabItemDirective header={this.headerText[4]} content={this.content4} />
        <TabItemDirective header={this.headerText[5]} content={this.content5} />
        <TabItemDirective header={this.headerText[6]} content={this.content6} />
        <TabItemDirective header={this.headerText[7]} content={this.content7} />
      </TabItemsDirective>
    </TabComponent>
  </div>
);
  }
}
ReactDOM.render(<ReactApp />, document.getElementById('element'));