I'd like give the user the ability to hide and show lines on a line chart.
But eventually a user will 'turn off' all the columns of a chart so I'm
looking for a way to hide ALL the columns of a chart.
Given this partial pseudo code:
myDataTable.addColumn('date', 'Month');
myDataTable.addColumn('number', 'Line 1');
myDataTable.addColumn('number', 'Line 2');
myDataTable.addColumn('number', 'Line 3');
... then add appropriate data to myDataTable...
myDataView = new google.visualization.DataView(myDataTable);
myDataView .setColumns([0, 1, 2, 3]);
myLineChart .draw(myDataView, myOptions);
(Shows all the columns of the chart)
But when I call this:
myDataView .setColumns([0]);
myLineChart .draw(myDataView, myOptions);
I get this error:
Not enough columns given to draw the requested chart.
I've also tried
myDataView .hideColumns([1,2,3])
draw...
and get the same error message.
Is there anyway to draw a chart when all the columns need to be hidden?
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