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Get all child nodes through parentID in treeview in React TreeView component

This section demonstrates how to get the child nodes from corresponding parent ID. Using the getNode method, you can get the node details of TreeView. Please refer to the following sample.

Source
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index.tsx
import * as ReactDOM from 'react-dom';
import * as React from 'react';
import {TreeViewComponent, NodeSelectEventArgs } from '@syncfusion/ej2-react-navigations';
import {enableRipple} from '@syncfusion/ej2-base';
enableRipple(true);

export default class App extends React.Component<{}, {}> {

   // Data source for TreeView component
  private data: { [key: string]: Object }[]= [
        {
            code: "AF", name: "Africa", countries: [
                { code: "NGA", name: "Nigeria" },
                { code: "EGY", name: "Egypt" },
                { code: "ZAF", name: "South Africa" }
            ]
        },
        {
            code: "AS", name: "Asia", countries: [
                { code: "CHN", name: "China" },
                { code: "IND", name: "India" , countries: [
                    { code: "TN", name: "TamilNadu" }
                ]},
                { code: "JPN", name: "Japan" }
            ]
        },
        {
            code: "EU", name: "Europe", countries: [
                { code: "DNK", name: "Denmark" },
                { code: "FIN", name: "Finland" },
                { code: "AUT", name: "Austria" }
            ]
        },
        {
            code: "NA", name: "North America", countries: [
                { code: "USA", name: "United States of America" },
                { code: "CUB", name: "Cuba" },
                { code: "MEX", name: "Mexico" }
            ]
        },
        {
            code: "SA", name: "South America", countries: [
                { code: "BR", name: "Brazil" },
                { code: "COL", name: "Colombia" },
                { code: "ARG", name: "Argentina" }
            ]
        },
    ];

    private field:Object ={  dataSource: this.data, id: 'code', text: 'name', child: 'countries' };
    private loadOnDemand: Boolean= false;
    public treeObj: TreeViewComponent;

     onCreate(): void {
        let proxy = this.treeObj;
        document.getElementById("btn").addEventListener("click",(event)=>{
            let id: any =document.getElementById('Nodes') as HTMLInputElement
            let element= proxy.element.querySelector('[data-uid="' + id.value + '"]');
            // Gets the child Element
            let liElements : any= element.querySelectorAll('ul li');
            let arr : any= [];
            for (let i = 0; i < liElements.length; i++) {
                let nodeData= proxy.getNode(liElements[i]);
                arr.push(nodeData);
            }
            alert(JSON.stringify(arr));
        });
    }
    render() {
        return (
            <div className = 'control-pane'>
                <div className='control-section'>
                    <div className='control_wrapper'>
                        {/* Render TreeView */}
                        <TreeViewComponent fields={this.field}  ref={(treeview) => { this.treeObj = treeview as TreeViewComponent; }} loadOnDemand={this.loadOnDemand} created={this.onCreate.bind(this)}/>
                    </div>
                </div>
            </div>
        )
    }
}

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