Copy and Paste Records in React Gantt component

import * as React from 'react';
import * as ReactDOM from 'react-dom';
import { GanttComponent, Inject, Edit, Selection, ContextMenu } from '@syncfusion/ej2-react-gantt';
import { data } from './datasource';
class App extends React.Component {
    constructor() {
        super(...arguments);
        this.taskFields = {
            id: 'TaskID',
            name: 'TaskName',
            startDate: 'StartDate',
            duration: 'Duration',
            progress: 'Progress',
            dependency: 'Predecessor',
            child: 'subtasks'
        };
        this.editSettings = {
            allowAdding: true,
            allowEditing: true,
            allowDeleting: true
        };
        this.contextMenuItems = [{ text: 'Copy', target: '.e-content', id: 'copy' },
            { text: 'Paste', target: '.e-content', id: 'paste' }
        ];
    }
    ;
    contextMenuClick(args) {
        if (args.item.id === 'copy') {
            this.copiedRecord = args.rowData;
            this.copiedRecord.taskData.TaskID = this.gantt.currentViewData.length + 1;
        }
        if (args.item.id === 'paste') {
            this.gantt.addRecord(this.copiedRecord.taskData, 'Below', args.rowData.index);
            if (this.copiedRecord.hasChildRecords) {
                this.addChildRecords(this.copiedRecord, args.rowData.index + 1);
            }
            this.copiedRecord = undefined;
        }
    }
    ;
    contextMenuOpen(args) {
        if (args.type !== 'Header') {
            if (this.copiedRecord) {
                args.hideItems.push('Copy');
            }
            else {
                args.hideItems.push('Paste');
            }
        }
    }
    ;
    addChildRecords(record, index) {
        for (var i = 0; i < record.childRecords.length; i++) {
            var childRecord = record.childRecords[i];
            childRecord.taskData.TaskID = this.gantt.currentViewData.length + 1;
            this.gantt.addRecord(childRecord.taskData, 'Below', index);
            if (childRecord.hasChildRecords) {
                this.addChildRecords(childRecord, index + (i + 1));
            }
        }
    }
    ;
    render() {
        return <GanttComponent dataSource={data} taskFields={this.taskFields} editSettings={this.editSettings} enableContextMenu={true} enableContextMenu={true} contextMenuItems={this.contextMenuItems} contextMenuClick={this.contextMenuClick.bind(this)} contextMenuOpen={this.contextMenuOpen.bind(this)} ref={gantt => this.gantt = gantt} height='450px'>
            <Inject services={[Edit, ContextMenu, Selection]}/>
        </GanttComponent>;
    }
}
;
ReactDOM.render(<App />, document.getElementById('root'));

import * as React from 'react';
import * as ReactDOM from 'react-dom';
import { GanttComponent, Inject, Edit, Selection, ContextMenu } from '@syncfusion/ej2-react-gantt';
import { data } from './datasource';
class App extends React.Component {
    constructor() {
        super(...arguments);
        this.taskFields = {
            id: 'TaskID',
            name: 'TaskName',
            startDate: 'StartDate',
            duration: 'Duration',
            progress: 'Progress',
            dependency: 'Predecessor',
            child: 'subtasks'
        };
        this.editSettings = {
            allowAdding: true,
            allowEditing: true,
            allowDeleting: true
        };
        this.contextMenuItems = [{ text: 'Copy', target: '.e-content', id: 'copy' },
            { text: 'Paste', target: '.e-content', id: 'paste' }
        ];
    };
    public copiedRecord: any;
    contextMenuClick(args) {
        if (args.item.id === 'copy') {
            this.copiedRecord = args.rowData;
            this.copiedRecord.taskData.TaskID = this.gantt.currentViewData.length + 1;
        }
        if (args.item.id === 'paste') {
            this.gantt.addRecord(this.copiedRecord.taskData,'Below',args.rowData.index);
            if(this.copiedRecord.hasChildRecords) {
                this.addChildRecords(this.copiedRecord, args.rowData.index + 1);
            }
            this.copiedRecord = undefined;
        }
    };
    contextMenuOpen(args) {
        if (args.type !== 'Header') {
            if (this.copiedRecord) {
                args.hideItems.push('Copy');
            } else {
                args.hideItems.push('Paste');
             }
        }
    };
    addChildRecords(record: any, index: any) {
        for(var i=0; i<record.childRecords.length; i++) {
              var childRecord = record.childRecords[i];
              childRecord.taskData.TaskID = this.gantt.currentViewData.length + 1;
              this.gantt.addRecord(childRecord.taskData,'Below',index);
              if(childRecord.hasChildRecords) {
                  this.addChildRecords(childRecord, index + (i+1));
              }
        }
      };
    render() {
        return <GanttComponent dataSource={data} taskFields={this.taskFields} editSettings={this.editSettings} enableContextMenu={true} enableContextMenu={true} contextMenuItems={this.contextMenuItems} contextMenuClick={this.contextMenuClick.bind(this)} contextMenuOpen={this.contextMenuOpen.bind(this)} ref={gantt => this.gantt = gantt} height='450px'>
            <Inject services={[Edit, ContextMenu, Selection]}/>
        </GanttComponent>;
    }
}
;
ReactDOM.render(<App />, document.getElementById('root'));

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

<head>
    <title>Syncfusion React Gantt</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="https://cdn.syncfusion.com/ej2/material.css" rel="stylesheet" type="text/css"/>
    <link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
     <style>
        #loader {
            color: #008cff;
            height: 40px;
            left: 45%;
            position: absolute;
            top: 45%;
            width: 30%;
        }
    </style>
</head>

<body>
        <div id='root'>
            <div id='loader'>Loading....</div>
        </div>
</body>

</html>