I have a basic Area Chart using Google Charts. I am able to set up tooltips for each point on the graph, but is there a way to have a single tooltip for all the points in a column.
Here's a screenshot of the desired behavior:
You can see that when the cursor is over a point on the graph, a vertical line is drawn and one tooltip displays to describe all the data in that column (data for both lines). See a live example here if needed.
Can this be achieved with Google Charts?
All you need to do is add the following to your options (in the case of a line chart): focusTarget: 'category'
Here is an example (just open Google Playground and add the above line to the options at the end):
function drawVisualization() {
// Create and populate the data table.
var data = google.visualization.arrayToDataTable([
['x', 'Cats', 'Blanket 1', 'Blanket 2'],
['A', 1, 1, 0.5],
['B', 2, 0.5, 1],
['C', 4, 1, 0.5],
['D', 8, 0.5, 1],
['E', 7, 1, 0.5],
['F', 7, 0.5, 1],
['G', 8, 1, 0.5],
['H', 4, 0.5, 1],
['I', 2, 1, 0.5],
['J', 3.5, 0.5, 1],
['K', 3, 1, 0.5],
['L', 3.5, 0.5, 1],
['M', 1, 1, 0.5],
['N', 1, 0.5, 1]
]);
// Create and draw the visualization.
new google.visualization.LineChart(document.getElementById('visualization')).
draw(data, {curveType: "function",
width: 500, height: 400,
vAxis: {maxValue: 10},
// This line will make you select an entire row of data at a time
focusTarget: 'category'
}
);
}
Easy as pie! For more details, see focusTarget in the Google Documentation
If you want something more complex, you can fiddle around with the domain Data Role
Here is a sample bit of code:
google.load('visualization', '1.1', {'packages':['corechart']});
google.setOnLoadCallback(drawChart_C6);
function drawChart_C6() {
var data = new google.visualization.DataTable();
data.addColumn({type: 'string', role: 'domain'}, '2009 Quarter');
data.addColumn('number', '2009 Sales');
data.addColumn('number', '2009 Expenses');
data.addColumn({type: 'string', role: 'domain'}, '2008 Quarter');
data.addColumn('number', '2008 Sales');
data.addColumn('number', '2008 Expenses');
data.addRows([
['Q1 \'09', 1000, 400, 'Q1 \'08', 800, 300],
['Q2 \'09', 1170, 460, 'Q2 \'08', 750, 400],
['Q3 \'09', 660, 1120, 'Q3 \'08', 700, 540],
['Q4 \'09', 1030, 540, 'Q4 \'08', 820, 620]
]);
var chart = new google.visualization.LineChart(document.getElementById('chart_C6'));
chart.draw(data, {width: 400, height: 240, legend:'right', focusTarget: 'category'});
}
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