You can achieve collapse and expand functionality in Tab by adding/removing a custom CSS class in the click event handler for each tab.
created event.selected event for Tab to collapse the initially selected Tab item and bind custom click handler for the Tab headers.import * as React from 'react';
import * as ReactDOM from 'react-dom';
import { TabComponent, TabItemDirective, TabItemsDirective, SelectEventArgs } from '@syncfusion/ej2-react-navigations';
import { enableRipple } from '@syncfusion/ej2-base';
enableRipple(true);
export default class App extends React.Component<{}, {}> {
public tabInstance:TabComponent | null;
public prevIndex: number = 0;
public trgIndex: number;
public actLine: HTMLElement;
constructor() {
super(PeriodicWave);
this.updateCollapseClass = this.updateCollapseClass.bind(this);
}
public updateCollapseClass(index: number): void {
// Custom classes are added/removed from tab content and active line element, when the same tab item again clicked
const cntEle: any = document.getElementById("e-content_" + index);
if (cntEle.classList.contains('collapse')) {
cntEle.classList.remove('collapse');
this.actLine.classList.remove('collapse');
} else {
cntEle.classList.add('collapse');
this.actLine.classList.add('collapse');
}
}
public tabCreated(): void {
// After tab created first tab content and active line are hidden by adding custom class
this.actLine = document.querySelector('.e-indicator') as any;
(document.getElementById("e-content_0") as any).classList.add('collapse');
this.actLine.classList.add('collapse');
}
public tabSelected(e: SelectEventArgs): void {
// If next tab item selected custom class is removed from content and active line element
let cnttrgs: NodeListOf<Element> = document.querySelectorAll('#element.e-tab > .e-content > .e-item');
for (let i: number = 0; i < cnttrgs.length; i++) {
cnttrgs[i].classList.remove('collapse');
}
if (this.actLine !== undefined) { this.actLine.classList.remove('collapse'); }
this.trgIndex = e.selectedIndex;
e.selectedItem.onclick = (e : Event) => {
this.updateCollapseClass(this.trgIndex);
};
}
render() {
let headertext: any;
headertext = [{ text: "Twitter"}, { text: "Facebook"}, { text: "WhatsApp"}];
return (
<TabComponent heightAdjustMode='Auto' className="e-background" id='element' ref={tab => this.tabInstance = tab} created={this.tabCreated} selected= {this.tabSelected.bind(this)}>
<TabItemsDirective>
<TabItemDirective header= { headertext[0] }
content= { 'Twitter is an online social networking service that enables users to send and read short 140-character ' +
'messages called "tweets". Registered users can read and post tweets, but those who are unregistered can only read ' +
'them. Users access Twitter through the website interface, SMS or mobile device app Twitter Inc. is based in San ' +
'Francisco and has more than 25 offices around the world. Twitter was created in March 2006 by Jack Dorsey, ' +
'Evan Williams, Biz Stone, and Noah Glass and launched in July 2006. The service rapidly gained worldwide popularity, ' +
'with more than 100 million users posting 340 million tweets a day in 2012.The service also handled 1.6 billion ' +
'search queries per day.' } />
<TabItemDirective header= { headertext[1] }
content= { 'Facebook is an online social networking service headquartered in Menlo Park, California. Its website was ' +
'launched on February 4, 2004, by Mark Zuckerberg with his Harvard College roommates and fellow students Eduardo ' +
'Saverin, Andrew McCollum, Dustin Moskovitz and Chris Hughes.The founders had initially limited the website\'\s ' +
'membership to Harvard students, but later expanded it to colleges in the Boston area, the Ivy League, and Stanford ' +
'University. It gradually added support for students at various other universities and later to high-school students.' } />
<TabItemDirective header= { headertext[2] }
content= { 'WhatsApp Messenger is a proprietary cross-platform instant messaging client for smartphones that operates ' +
'under a subscription business model. It uses the Internet to send text messages, images, video, user location and ' +
'audio media messages to other users using standard cellular mobile numbers. As of February 2016, WhatsApp had a user ' +
'base of up to one billion,[10] making it the most globally popular messaging application. WhatsApp Inc., based in ' +
'Mountain View, California, was acquired by Facebook Inc. on February 19, 2014, for approximately US* 9.3 billion.' } />
</TabItemsDirective>
</TabComponent>
);
}
}
ReactDOM.render(<App />, document.getElementById('element'));#loader {
color: #008cff;
height: 40px;
left: 45%;
position: absolute;
top: 45%;
width: 30%;
}
.e-content .e-item {
font-size: 12px;
margin: 10px;
text-align: justify;
}
.container {
margin: 0 10px;
min-width: 350px;
}
.info {
margin: 10px;
font-weight: bold;
}
.e-tab .e-content > .e-item.e-active.collapse { /* csslint allow: adjoining-classes */
display: none;
}
.e-tab .e-tab-header .e-indicator.collapse { /* csslint allow: adjoining-classes */
display: none;
}import * as React from 'react';
import * as ReactDOM from 'react-dom';
import { TabComponent, TabItemDirective, TabItemsDirective } from '@syncfusion/ej2-react-navigations';
import { enableRipple } from '@syncfusion/ej2-base';
enableRipple(true);
export default class App extends React.Component {
constructor() {
super(PeriodicWave);
this.prevIndex = 0;
this.updateCollapseClass = this.updateCollapseClass.bind(this);
}
updateCollapseClass(index) {
// Custom classes are added/removed from tab content and active line element, when the same tab item again clicked
const cntEle = document.getElementById("e-content_" + index);
if (cntEle.classList.contains('collapse')) {
cntEle.classList.remove('collapse');
this.actLine.classList.remove('collapse');
}
else {
cntEle.classList.add('collapse');
this.actLine.classList.add('collapse');
}
}
tabCreated() {
// After tab created first tab content and active line are hidden by adding custom class
this.actLine = document.querySelector('.e-indicator');
document.getElementById("e-content_0").classList.add('collapse');
this.actLine.classList.add('collapse');
}
tabSelected(e) {
// If next tab item selected custom class is removed from content and active line element
let cnttrgs = document.querySelectorAll('#element.e-tab > .e-content > .e-item');
for (let i = 0; i < cnttrgs.length; i++) {
cnttrgs[i].classList.remove('collapse');
}
if (this.actLine !== undefined) {
this.actLine.classList.remove('collapse');
}
this.trgIndex = e.selectedIndex;
e.selectedItem.onclick = (e) => {
this.updateCollapseClass(this.trgIndex);
};
}
render() {
let headertext;
headertext = [{ text: "Twitter" }, { text: "Facebook" }, { text: "WhatsApp" }];
return (<TabComponent heightAdjustMode='Auto' className="e-background" id='element' ref={tab => this.tabInstance = tab} created={this.tabCreated} selected={this.tabSelected.bind(this)}>
<TabItemsDirective>
<TabItemDirective header={headertext[0]} content={'Twitter is an online social networking service that enables users to send and read short 140-character ' +
'messages called "tweets". Registered users can read and post tweets, but those who are unregistered can only read ' +
'them. Users access Twitter through the website interface, SMS or mobile device app Twitter Inc. is based in San ' +
'Francisco and has more than 25 offices around the world. Twitter was created in March 2006 by Jack Dorsey, ' +
'Evan Williams, Biz Stone, and Noah Glass and launched in July 2006. The service rapidly gained worldwide popularity, ' +
'with more than 100 million users posting 340 million tweets a day in 2012.The service also handled 1.6 billion ' +
'search queries per day.'}/>
<TabItemDirective header={headertext[1]} content={'Facebook is an online social networking service headquartered in Menlo Park, California. Its website was ' +
'launched on February 4, 2004, by Mark Zuckerberg with his Harvard College roommates and fellow students Eduardo ' +
'Saverin, Andrew McCollum, Dustin Moskovitz and Chris Hughes.The founders had initially limited the website\'\s ' +
'membership to Harvard students, but later expanded it to colleges in the Boston area, the Ivy League, and Stanford ' +
'University. It gradually added support for students at various other universities and later to high-school students.'}/>
<TabItemDirective header={headertext[2]} content={'WhatsApp Messenger is a proprietary cross-platform instant messaging client for smartphones that operates ' +
'under a subscription business model. It uses the Internet to send text messages, images, video, user location and ' +
'audio media messages to other users using standard cellular mobile numbers. As of February 2016, WhatsApp had a user ' +
'base of up to one billion,[10] making it the most globally popular messaging application. WhatsApp Inc., based in ' +
'Mountain View, California, was acquired by Facebook Inc. on February 19, 2014, for approximately US* 9.3 billion.'}/>
</TabItemsDirective>
</TabComponent>);
}
}
ReactDOM.render(<App />, document.getElementById('element'));