text: import React from 'react';
  import ReactDOM from 'react-dom';
  
  import JqxTreeGrid from '../../../jqwidgets-react/react_jqxtreegrid.js';
  
  class App extends React.Component {
      componentDidMount() {
          this.refs.myTreeGrid.expandRow(2);
      }
      render () {
          let employees = [{ "EmployeeID": 1, "FirstName": "Nancy", "LastName": "Davolio", "ReportsTo": 2, "Country": "USA", "Title": "Sales Representative", "HireDate": "1992-05-01 00:00:00", "BirthDate": "1948-12-08 00:00:00", "City": "Seattle", "Address": "507 - 20th Ave. E.Apt. 2A" }, { "EmployeeID": 2, "FirstName": "Andrew", "LastName": "Fuller", "ReportsTo": null, "Country": "USA", "Title": "Vice President, Sales", "HireDate": "1992-08-14 00:00:00", "BirthDate": "1952-02-19 00:00:00", "City": "Tacoma", "Address": "908 W. Capital Way" }, { "EmployeeID": 3, "FirstName": "Janet", "LastName": "Leverling", "ReportsTo": 2, "Country": "USA", "Title": "Sales Representative", "HireDate": "1992-04-01 00:00:00", "BirthDate": "1963-08-30 00:00:00", "City": "Kirkland", "Address": "722 Moss Bay Blvd." }, { "EmployeeID": 4, "FirstName": "Margaret", "LastName": "Peacock", "ReportsTo": 2, "Country": "USA", "Title": "Sales Representative", "HireDate": "1993-05-03 00:00:00", "BirthDate": "1937-09-19 00:00:00", "City": "Redmond", "Address": "4110 Old Redmond Rd." }, { "EmployeeID": 5, "FirstName": "Steven", "LastName": "Buchanan", "ReportsTo": 2, "Country": "UK", "Title": "Sales Manager", "HireDate": "1993-10-17 00:00:00", "BirthDate": "1955-03-04 00:00:00", "City": "London", "Address": "14 Garrett Hill" }, { "EmployeeID": 6, "FirstName": "Michael", "LastName": "Suyama", "ReportsTo": 5, "Country": "UK", "Title": "Sales Representative", "HireDate": "1993-10-17 00:00:00", "BirthDate": "1963-07-02 00:00:00", "City": "London", "Address": "Coventry House Miner Rd." }, { "EmployeeID": 7, "FirstName": "Robert", "LastName": "King", "ReportsTo": 5, "Country": "UK", "Title": "Sales Representative", "HireDate": "1994-01-02 00:00:00", "BirthDate": "1960-05-29 00:00:00", "City": "London", "Address": "Edgeham Hollow Winchester Way" }, { "EmployeeID": 8, "FirstName": "Laura", "LastName": "Callahan", "ReportsTo": 2, "Country": "USA", "Title": "Inside Sales Coordinator", "HireDate": "1994-03-05 00:00:00", "BirthDate": "1958-01-09 00:00:00", "City": "Seattle", "Address": "4726 - 11th Ave. N.E." }, { "EmployeeID": 9, "FirstName": "Anne", "LastName": "Dodsworth", "ReportsTo": 5, "Country": "UK", "Title": "Sales Representative", "HireDate": "1994-11-15 00:00:00", "BirthDate": "1966-01-27 00:00:00", "City": "London", "Address": "7 Houndstooth Rd." }];
          //// prepare the data
          let source =
          {
              dataType: "json",
              dataFields: [
                  { name: 'EmployeeID', type: 'number' },
                  { name: 'ReportsTo', type: 'number' },
                  { name: 'FirstName', type: 'string' },
                  { name: 'LastName', type: 'string' },
                  { name: 'Country', type: 'string' },
                  { name: 'City', type: 'string' },
                  { name: 'Address', type: 'string' },
                  { name: 'Title', type: 'string' },
                  { name: 'HireDate', type: 'date' },
                  { name: 'BirthDate', type: 'date' }
              ],
              hierarchy:
              {
                  keyDataField: { name: 'EmployeeID' },
                  parentDataField: { name: 'ReportsTo' }
              },
              id: 'EmployeeID',
              localData: employees
          };
          let dataAdapter = new $.jqx.dataAdapter(source, {
              beforeLoadComplete: (records) => {
                  for (let i = 0; i < records.length; i++) {
                      let imgUrl = '../../images/' + records[i].FirstName.toLowerCase() + '.png';
                      records[i].icon = imgUrl;
                  }
                  return records;
              }
          });
          let columns = [
              { text: 'FirstName', columnGroup: 'Name', dataField: 'FirstName', width: 200 },
              { text: 'LastName', columnGroup: 'Name', dataField: 'LastName', width: 150 },
              { text: 'Title', dataField: 'Title', width: 160 },
              { text: 'Birth Date', dataField: 'BirthDate', cellsFormat: 'd', width: 120 },
              { text: 'Hire Date', dataField: 'HireDate', cellsFormat: 'd', width: 120 },
              { text: 'Address', dataField: 'Address', width: 250 },
              { text: 'City', dataField: 'City', width: 120 },
              { text: 'Country', dataField: 'Country' }
          ];
          let columnGroups = [ { text: 'Name', name: 'Name' } ];
          return (
              <JqxTreeGrid ref='myTreeGrid'
                  width={850}
                  source={dataAdapter}
                  icons={true}
                  columns={columns}
                  columnGroups={columnGroups}
              />
          )
      }
  }
  
  ReactDOM.render(<App />, document.getElementById('app'));
  