text: var columnDefs = [
  
      {
          headerName: "Country", width: 200, showRowGroup:'country', cellRenderer:'agGroupCellRenderer',
          filterValueGetter: function(params) { return params.data ? params.data.country : null; }
      },
  
      {field:'country', rowGroup: true, hide: true},
  
      {
          headerName: "Year / Athlete", width: 150, showRowGroup:'year', cellRenderer:'agGroupCellRenderer',
          valueGetter: 'data ? data.athlete : null'
      },
  
      {field: 'year', rowGroup: true, hide: true},
  
      {headerName: "Sport", field: "sport", width: 110},
      {headerName: "Athlete", field: "athlete", width: 200},
      {headerName: "Gold", field: "gold", width: 100},
      {headerName: "Silver", field: "silver", width: 100},
      {headerName: "Bronze", field: "bronze", width: 100},
      {headerName: "Total", field: "total", width: 100},
      {headerName: "Age", field: "age", width: 90},
      {headerName: "Date", field: "date", width: 110}
  ];
  
  var gridOptions = {
      enableColResize: true,
      columnDefs: columnDefs,
      animateRows: true,
      enableRangeSelection: true,
      rowData: null,
      enableSorting:true,
      enableFilter:true,
      groupMultiAutoColumn:true,
      groupSuppressAutoColumn: true
  };
  
  // setup the grid after the page has finished loading
  document.addEventListener('DOMContentLoaded', function() {
      var gridDiv = document.querySelector('#myGrid');
      new agGrid.Grid(gridDiv, gridOptions);
  
      // do http request to get our sample data - not using any framework to keep the example self contained.
      // you will probably use a framework like JQuery, Angular or something else to do your HTTP calls.
      var httpRequest = new XMLHttpRequest();
      httpRequest.open('GET', 'https://raw.githubusercontent.com/ag-grid/ag-grid/master/packages/ag-grid-docs/src/olympicWinnersSmall.json');
      httpRequest.send();
      httpRequest.onreadystatechange = function() {
          if (httpRequest.readyState === 4 && httpRequest.status === 200) {
              var httpResult = JSON.parse(httpRequest.responseText);
              gridOptions.api.setRowData(httpResult);
          }
      };
  });