We are new to angularjs v4. We have a requirement of drilldown charts in 
google charts. We are using ng2-google-charts directives. We are able to 
find the select event and updated the data. but chart is not reloading. 
Could any one please help on this.

*view: index.html*

   <google-chart #drillchart [data]='pieChartData' type="BarChart" 
(chartSelect)='select($event)'>
   </google-chart>

*Component.ts:*

pieChartData =  {

    chartType: 'BarChart',
    dataTable: [
      ['Country', 'Poulation'],
      ['Ind', 25],
      ['Rus', 10],
      ['Chi', 30],
      ['USA', 15],
      ['UK', 12],
      ['Aus', 8]
    ],
    options: {'title': 'Population'}

  };

newDataIndia = [

    ['State', 'Poulation'],
    ['AndhraPradesh', 30],
    ['UttarPradesh',      40],
    ['MadyaPradesh',  10],
    ['Karnataka', 10],
    ['Tamilnadu', 10]
    ];

  newDataUS = [

    ['State', 'Poulation'],
    ['Texas', 30],
    ['Florida',      40],
    ['Pennsylvania',  10],
    ['Lousiana', 15],
    ['Colorado', 10]
  ];
public changeData(data):void {

    /*let dataTable = this.drillchart.wrapper.getDataTable();
    for (let i = 0; i < 6; i++) {
      dataTable.setValue(i, 1, Math.round(Math.random() * 1000));
      dataTable.setValue(i, 2, Math.round(Math.random() * 1000));
    }*/
    let dataTable = this.drillchart.wrapper.getDataTable()
    console.log(dataTable);
    dataTable.Sf[0].label = data[0][0];
    dataTable.Sf[0].type = "string";
    dataTable.Sf[1].label = data[0][1];
    dataTable.Sf[1].type = "number";

    for (let i = 0; i < data.length-1; i++) {
      dataTable.Tf[i].c[0].v = data[i+1][0];
      dataTable.Tf[i].c[1].v = data[i+1][1];
    }

    if(dataTable.Tf.length < data.length-1)
    {
      for(var icount = data.length-1; icount != data.length-1; icount--) {
        dataTable = dataTable.Tf.pop();
      }
    }

    this.drillchart.redraw();
  }

Thanks in advance.

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