Let me see if I have this correct: you want to get the number of non-null,
non-zero points currently in view in the chart, right?
Try this:
google.visualization.events.addListener(rangeFilter, 'statechange',
function (e) {
// check e.inProgress to see if the rangeFilter is currently being
changed, in case you only want to fire this once it's done
var dt = chart.getDataTable();
var rows = dt.getFilteredRows([{column: <the column you want to check>,
minValue: 0}]);
var zeroRows = dt.getFilteredRows([{column: <the column you want to
check>, value: 0}]);
// remove 0's from the rows
for (var i = 0; i < zeroRows.length; i++) {
var index = rows.indexOf(zeroRows[i]);
if (index > -1) {
// should always be true, but check just in case
rows.splice(index, 1);
}
}
// rows.length is the count of rows with non-zero, non-null values in
the current view
});
On Saturday, September 7, 2013 10:49:18 AM UTC-4, dilishali wrote:
>
> I am showing at every point a percent of the first visible value for a
> column in my chart. However if the first value is null or 0 everything else
> will be 0.
> To overcome this, if the first value is 0 or null I move forward 1 point
> until I find a point with a good value.
> But sometimes there are more values of 0 or null than visible points, so
> an error indicator appears.
>
> How can I get the number of visible points for a column, or how can I
> disable the errors?
>
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