Google Combo Chart with multiple series, how to add custom HTML Tooltip

Question

I\'ve Google combo chart and like to add a Tooltip. The icCube documention has an example how to add a HTML tooltip but this will not work for series, only the last item in

Answer 1

for google charts, you can reference the Data Format of the specific chart

for most, the tooltip follows the series column

to have multiple series, each with it's own custom html tooltip,
add a column after each series column

NOTE: for custom html tooltips to work, the following must be in place...

the column must have property --> html: true

dataTable.addColumn({type: 'string', role: 'tooltip', p: {html: true}});

and the configuration options must include...

tooltip: {isHtml: true}

see following working snippet, the tooltip columns are loaded initially as null

then the tooltip is built based on the values in the series columns

google.charts.load('current', {
  callback: function () {
    var container = document.getElementById('chart_div');
    var chart = new google.visualization.ComboChart(container);

    var dataTable = new google.visualization.DataTable();
    dataTable.addColumn({type: 'string', label: 'Year'});

    // series 0
    dataTable.addColumn({type: 'number', label: 'Category A'});
    dataTable.addColumn({type: 'string', role: 'tooltip', p: {html: true}});

    // series 1
    dataTable.addColumn({type: 'number', label: 'Category B'});
    dataTable.addColumn({type: 'string', role: 'tooltip', p: {html: true}});

    // series 2
    dataTable.addColumn({type: 'number', label: 'Category C'});
    dataTable.addColumn({type: 'string', role: 'tooltip', p: {html: true}});

    dataTable.addRows([
      ['2014', 1000, null, 2000, null, 3000, null],
      ['2015', 2000, null, 4000, null, 6000, null],
      ['2016', 3000, null, 6000, null, 9000, null],
    ]);

    for (var i = 0; i < dataTable.getNumberOfRows(); i++) {
      dataTable.setValue(i, 2, getTooltip(i, 1));
      dataTable.setValue(i, 4, getTooltip(i, 3));
      dataTable.setValue(i, 6, getTooltip(i, 5));
    }

    function getTooltip(rowIndex, columnIndex) {
      return '
' +
        dataTable.getValue(rowIndex, 0) + ': ' +
        dataTable.getFormattedValue(rowIndex, columnIndex) + '
';
    }

    chart.draw(dataTable, {
      legend: {
        position: 'bottom'
      },
      pointSize: 4,
      seriesType: 'area',
      series: {
        2: {
          pointSize: 12,
          pointShape: {
            type: 'star',
            sides: 5,
            dent: 0.6
          },
          type: 'scatter'
        }
      },
      tooltip: {isHtml: true}
    });
  },
  packages: ['corechart']
});

.ggl-tooltip {
  border: 1px solid #E0E0E0;
  font-family: Arial, Helvetica;
  font-size: 10pt;
  padding: 12px 12px 12px 12px;
}

.ggl-tooltip span {
  font-weight: bold;
}