I believe that the "interval" role is not supported for ScatterCharts; the
documentation lists it as supported for "column n" roles, but it should be
"emphasis" there.
On Friday, July 13, 2012 1:43:52 AM UTC-4, Andrew Nelson wrote:
>
> Hi,
> I've been trying to plot error bars on a scatter chart (using the
> scatterchart playground). However, I keep getting an error: "Cannot read
> property type of 'null'".
>
> There must be something simple going on. I've been trying for a while, but
> I'm a bit of a newbie to Javascript. Can anyone point out where I'm going
> wrong?
> The code follows.
>
> <code>
> function drawVisualization() {
> // Create and populate the data table.
> var data = new google.visualization.DataTable();
> data.addColumn({type:'number', role:'domain'});
> data.addColumn({type:'number', role:'data'});
> data.addColumn({type:'number', role:'interval'});
> data.addColumn({type:'number', role:'interval'});
>
> data.addRows( [[1, 1, 0, 4],
> [2,2, 0, 4]
> ]);
>
>
> // Create and draw the visualization.
> var chart = new google.visualization.ScatterChart(
> document.getElementById('visualization'));
> chart.draw(data, {title: 'Cool shapes',
> width: 600, height: 400,
> vAxis: {title: "Y", titleTextStyle: {color:
> "green"}},
> hAxis: {title: "X", titleTextStyle: {color:
> "green"}}}
> );
> }
> </code>
>
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