How to dynamically add rows/columns to a Google Column Chart

Question

I want to create a Column Chart , using Google Visualization API , I can send the data to populate the chart\'s DataTable in array form. But I need to generate the chart with va

Answer 1

You can put the data in one string and use JSON.parse(stringData). The year column must be in double quotes

var data = new google.visualization.DataTable();  
data.addColumn('string', 'Year');  
data.addColumn('number', 'Sales'); 
data.addColumn('number', 'Expenses'); 

var stringData = '[["2004", 1000 , 400], ["2005", 1170, 460], ["2006", 660, 1120], ["2007",1030,540]]';

data.addRows(JSON.parse(stringData));

Answer 2

Here's a working solution in jsfiddle.

Look at the following function. This iterates over an array of data and updates the chart:

// 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 < numCols; i++)
            dataTable.addColumn('number', newData[0][i]);           

          // now add the rows.
          for (var i = 1; i < numRows; i++)
            dataTable.addRow(newData[i]);            

          // redraw the chart.
          chart.draw(dataTable, options);        

      }

Answer 3

var obj = JSON.parse(r.d);//Json data will come from any web service or any other source
 var data2 = new google.visualization.DataTable();    
 //To Add Column Dynamically

    for (var j = 0; j < array.length; j++) // this array contains columns
     {
      if (j == 0)
      {
          data2.addColumn(typeof (array[j]), array[j]);
      }
     else
       {
          data2.addColumn('number', array[j]);//if 2nd column must be integer
       } 
    }   
     //   To Add Rows Dynamically to a google chart  

                 data2.addRows(obj.length);\\Total Rows
                     for (var i = 0; i < obj.length; i++)
                     {
                        for (var k = 0; k < array.length; k++)//Total Column 
                         {
                           if (k == 0) 
                             {
                               data2.setCell(i, k, obj[i][array[k]].toString());//if first Column is String
                             } 
                              else
                             {
                               data2.setCell(i, k, parseInt([obj[i][array[k]]]));//if other columns are int type... for charts mostly we treat just first column as string
                             }
                         }
                    }