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Tab Selection in React Tabs component

30 Sep 2022 / 5 minutes to read

We can able to find the tab selection whether it is selected by user interaction or programmatically way in the selecting and selected event argument with the field of isInteracted. When the user changes the tab through click actions it will return true otherwise, it will return false. The following code example depicts to find the tab selecting the state in selecting and selected events.

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index.jsx
index.html
index.tsx
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import * as React from 'react';
import * as ReactDOM from 'react-dom';
import { TabComponent, TabItemDirective, TabItemsDirective } from '@syncfusion/ej2-react-navigations';
import { DropDownListComponent } from '@syncfusion/ej2-react-dropdowns';
export default class App extends React.Component {
    constructor() {
        super(...arguments);
        this.tabInstance = new TabComponent({});
        this.dropdownData = [
            { text: 'HTML', Id: 0 },
            { text: 'C-Sharp(C#)', Id: 1 },
            { text: 'Java', Id: 2 },
            { text: 'VB.NET', Id: 3 },
            { text: 'Xamarin', Id: 4 },
            { text: 'ASP.NET', Id: 5 },
            { text: 'ASP.NET MVC', Id: 6 },
            { text: 'JavaScript', Id: 7 }
        ];
        this.fields = { text: 'text', value: 'Id' };
    }
    ;
    dropdownChange(args) {
        this.tabInstance.select(args.value);
    }
    selecting(args) {
        this.getInteractionDetail(args.isInteracted);
    }
    selected(args) {
        this.getInteractionDetail(args.isInteracted);
    }
    getInteractionDetail(interact) {
        let eventlog = interact
            ? 'Tab Item selected by user interaction'
            : 'Tab Item selected by programmatically';
        document.getElementById('EventLog').innerHTML = document.getElementById('EventLog').innerHTML = '<b>' + eventlog + '</b></span>';
    }
    render() {
        let headertext = [
            { text: 'HTML' },
            { text: 'C-Sharp(C#)' },
            { text: 'Java' },
            { text: 'VB.NET' },
            { text: 'Xamarin' },
            { text: 'ASP.NET' },
            { text: 'ASP.NET MVC' },
            { text: 'JavaScript' }
        ];
        return (<div>
      <div className="EventLog" id="EventLog"></div>
      <DropDownListComponent index={0} change={this.dropdownChange.bind(this)} dataSource={this.dropdownData} fields={this.fields} floatLabelType="Always" placeholder="Select Tab Item using dropdown"/>
      <TabComponent heightAdjustMode='Auto' selecting={this.selecting.bind(this)} ref={(tab) => this.tabInstance = tab} selected={this.selected.bind(this)}>
         <TabItemsDirective>
          <TabItemDirective header={headertext[0]} content={'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. 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.'}/>
          <TabItemDirective header={headertext[1]} content={'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.'}/>
          <TabItemDirective header={headertext[2]} content={'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-mobile phones to platform computing environment. Java ' +
            'is used in a wide variety of computing platforms from embedded devices and 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.'}/>
          <TabItemDirective header={headertext[3]} content={'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.'}/>
          <TabItemDirective header={headertext[4]} content={'Xamarin is a San Francisco, California based software company created in May ' +
            '2011 by the engineers that created Mono, 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. Xamarin has over 1 million developers in more ' +
            'than 120 countries around the World as of May 2015.'}/>
          <TabItemDirective header={headertext[5]} content={'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's 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.'}/>
          <TabItemDirective header={headertext[6]} content={'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.'}/>
      <TabItemDirective header={headertext[7]} content={'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. More recently, however, it has become common in both game development ' +
            'and the creation of desktop applications.'}/>
    </TabItemsDirective>
  </TabComponent>
  </div>);
    }
}
ReactDOM.render(<App />, document.getElementById('element'));
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<!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="index.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/20.3.47/material.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>
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import * as React from 'react';
import * as ReactDOM from 'react-dom';
import { TabComponent, TabItemDirective, TabItemsDirective, SelectingEventArgs, SelectEventArgs } from '@syncfusion/ej2-react-navigations';
import { ChangeEventArgs, DropDownListComponent } from '@syncfusion/ej2-react-dropdowns';

export default class App extends React.Component<{}, {}> {
  public tabInstance:TabComponent = new TabComponent({});;
  private dropdownData: {[key: string]: Object;}[] = [
    { text: 'HTML', Id: 0 },
    { text: 'C-Sharp(C#)', Id: 1 },
    { text: 'Java', Id: 2 },
    { text: 'VB.NET', Id: 3 },
    { text: 'Xamarin', Id: 4 },
    { text: 'ASP.NET', Id: 5 },
    { text: 'ASP.NET MVC', Id: 6 },
    { text: 'JavaScript', Id:7 }
  ];
  private fields: Object = { text: 'text', value: 'Id' };
  public dropdownChange(args:ChangeEventArgs): void {
    this.tabInstance.select(args.value as number)
  }
  public selecting(args: SelectingEventArgs) {
    this.getInteractionDetail(args.isInteracted as boolean);
  }
  public selected(args: SelectEventArgs) {
    this.getInteractionDetail(args.isInteracted as boolean);
  }
  public getInteractionDetail(interact: boolean): void {
    let eventlog = interact
      ? 'Tab Item selected by user interaction'
      : 'Tab Item selected by programmatically';
    (document.getElementById('EventLog')as any).innerHTML = (document.getElementById(
      'EventLog'
    ) as any).innerHTML = '<b>' + eventlog + '</b></span>';
  }
  render() {
    let headertext: any = [
      { text: 'HTML' },
      { text: 'C-Sharp(C#)' },
      { text: 'Java' },
      { text: 'VB.NET' },
      { text: 'Xamarin' },
      { text: 'ASP.NET' },
      { text: 'ASP.NET MVC' },
      { text: 'JavaScript' }
    ];
    return (
      <div>
      <div className="EventLog" id="EventLog" ></div>
      <DropDownListComponent index={0} change={this.dropdownChange.bind(this)}dataSource={this.dropdownData} fields = {this.fields}floatLabelType="Always"  placeholder="Select Tab Item using dropdown" />
      <TabComponent heightAdjustMode='Auto'  selecting= {this.selecting.bind(this)}
          ref={(tab: TabComponent) => this.tabInstance = tab}   selected= {this.selected.bind(this)} >
         <TabItemsDirective>
          <TabItemDirective
            header={headertext[0]}
            content={
              '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. 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.'
            }
          />
          <TabItemDirective
            header={headertext[1]}
            content={
              '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.'
            }
          />
          <TabItemDirective
            header={headertext[2]}
            content={
              '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-mobile phones to platform computing environment. Java ' +
              'is used in a wide variety of computing platforms from embedded devices and 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.'
            }
          />
          <TabItemDirective
            header={headertext[3]}
            content={
              '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.'
            }
          />
          <TabItemDirective
            header={headertext[4]}
            content={
              'Xamarin is a San Francisco, California based software company created in May ' +
              '2011 by the engineers that created Mono, 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. Xamarin has over 1 million developers in more ' +
              'than 120 countries around the World as of May 2015.'
            }
          />
          <TabItemDirective
            header={headertext[5]}
            content={
              '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's 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.'
            }
          />
          <TabItemDirective
            header={headertext[6]}
            content={
              '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.'
        }
      />
      <TabItemDirective
        header={headertext[7]}
        content={
          '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. More recently, however, it has become common in both game development ' +
          'and the creation of desktop applications.'
        }
      />
    </TabItemsDirective>
  </TabComponent>
  </div>
);
  }
}

ReactDOM.render(<App />, document.getElementById('element'));