Google Charts BAR

Updating Google Chart

by Tsuneo Yoshioka

HTML

<script type="text/javascript" src="https://www.google.com/jsapi"></script>
    <script type="text/javascript">
      google.load("visualization", "1", {packages:["corechart"]});
      google.setOnLoadCallback(drawChart);
        
      var chart;
      var data;
      var options;
      
      function drawChart() {
        dataTable = google.visualization.arrayToDataTable([
          ['Year', 'Sales', 'Expenses'],
          ['2004',  1000,      400],
        ]);

        options = {
          title: 'Company Performance',
          hAxis: {title: 'Year', titleTextStyle: {color: 'red'}}
        };

        chart = new google.visualization.ColumnChart(document.getElementById('chart_div'));
        chart.draw(dataTable, options);
      }
        
      // function to update the chart with new data.
      function updateChart() {
       
          dataTable = new google.visualization.DataTable();
          
          var newData = [['Year', 'Sales', 'Expenses' , 'Other'],
            ['2004',  1000,      400     ,  232   ],
            ['2005',  1170,      460    ,  421   ],
            ['2006',  660,       1120    ,  4324  ],
            ['2007',  1030,      540     ,  4234  ],
            ['2008',  1530,      50     ,    234  ]];
        
          // determine the number of rows and columns.
          //var numRows = newData.length;
         // var numCols = newData[0].length;
        
          // in this case the first column is of type 'string'.
          dataTable.addColumn('string', newData[0][0]);
        
          // all other columns are of type 'number'.
          for (var i = 1; i < newData[0].length; i++)
            dataTable.addColumn('number', newData[0][i]);           
        
          // now add the rows.
          for (var i = 1; i < newData.length; i++) 
            dataTable.addRow(newData[i]);            

          // redraw the chart.

          chart.draw(dataTable, options);        
      
      }
        
    </script>

  <body>
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