Drilldown charts in angular js using google charts directives

Question

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 u

Answer 1

Like highcharts there isn't any simple way in google charts to make drilldown. But with some tricks it is possible

 <input type="button" style="width: auto !important;" value="back" id="btnBack" />
<div id="SkillBar"></div>

Take a back button and a container to draw chart. Now load your visualization library bar charts and create your bar chart

google.charts.load('current', { packages: ['corechart', 'bar'] });
 google.charts.setOnLoadCallback(drawAnnotations);
   function drawAnnotations() {
        google.charts.setOnLoadCallback(drawSkillBar);

        function drawSkillBar() {

            var data = new google.visualization.DataTable();


            data.addColumn('string', 'Category');
            data.addColumn('number', 'Demand');
            data.addColumn({ type: 'number', role: 'annotation' });
            data.addColumn('number', 'Supply Overall');
            data.addColumn({ type: 'number', role: 'annotation' });
            data.addColumn('number', 'Bench and Buffer');
            data.addColumn({ type: 'number', role: 'annotation' });

            data.addRows([
              ['Core', 25, 25, 22, 22, 12, 12],
              ['Invest', 15, 15, 21, 21, 11, 11],
              ['Others', 10, 10, 12, 12, 9, 9]
            ]);

            var options = {
                title: '',
                //hAxis: {
                //    title: 'Time of Day',
                //},
                //vAxis: {
                //    title: 'Rating (scale of 1-10)'
                //},
                is3D: true,
                'height': 300,
                'width': 600,
                colors: ['#3366CC', '#378eb8', '#984ea3'],
                legend: 'true',
                //focusTarget: 'category',
                animation: {
                    startup: true,
                    duration: 500,
                    easing: 'out'
                }
            };


            var chart = new google.visualization.ColumnChart(document.getElementById('SkillBar'));

Create your select handler like this

 function selectHandler() {
                var selectedItem = chart.getSelection()[0];

                if (selectedItem && selectedItem.row != null) {
                    var value = data.getValue(selectedItem.row, selectedItem.column);
                    var column = data.getColumnLabel(selectedItem.column)

                    if (column.toLowerCase() == 'demand') {
                        $('#btnBack').removeClass('hidden');
                        drawDemandBar(data.getValue(selectedItem.row, 0), '#3366CC');
                    }
                    if (column.toLowerCase() == 'supply overall') {
                        $('#btnBack').removeClass('hidden');
                        drawSupplyBar(data.getValue(selectedItem.row, 0), '#378eb8');
                    }
                    if (column.toLowerCase() == 'bench and buffer') {
                        $('#btnBack').removeClass('hidden');
                        drawOthersBar(data.getValue(selectedItem.row, 0), '#984ea3');
                    }

                }
            }

Now draw your chart with select handler event attached

google.visualization.events.addListener(chart, 'select', selectHandler);
            chart.draw(data, options);

Thats it.. Now all you have to do is declare three different functions for 3 bars

1. drawSupplyBar()  2. drawDemandBar() 3. drawOthersBar()

you can find full code and working fiddle Here