chartWrapper and dataView

[dunba...@gmail.com]

Does chartWrapper work with dataView? 

In other words, I have

var view = new google.visualization.DataView(data);

view.setRows(view.getFilteredRows([{column: 3, value: 'some category'}]));

var chart = new google.visualization.ChartWrapper({

        chartType: 'ScatterChart',

        containerId: 'chart_div',

        dataTable: data,

view: view,

    });

chart.draw();

...but the 'view' doesn't have any effect on the data drawn in the chart - all the data is drawn. Am I doing something wrong or do I have to use chart.draw(view,options)? 

Thank you!

[Daniel LaLiberte]

Nick,

It may not be clear enough from the documentation, but the ChartWrapper's view property is not for specifying a DataView, but for a view spec that is similar to what a DataView might use.  E.g., you can specify view: { columns: [0, 2, 4] }.   For details, see the drawChart function at https://developers.google.com/chart/interactive/docs/reference#google.visualization.drawchart

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Daniel LaLiberte

dlaliberte@Google.com   5CC, Cambridge MA

[Nick Dunbar]

Dan, 

Thanks for this reply. What I really want to do is use the output of getFilteredRows() as the chartWrapper input. I had a further question about that. In particular, I wanted to see if it was possible to do Boolean combinations of criteria across different columns. So if I have 

getFilteredRows([{column: 3, value: 'category1'}, {column: 2, value: 'category2'}]

I interpret that in Boolean terms to mean rows where column 3 takes value category1 AND column 2 takes value category2. However, what if I want to select rows where column 3 takes value category1 OR column2 takes value category2, or perhaps rows where column3 does NOT take value category1? Is this possible within the syntax? 

All feedback gratefully appreciated.

Nick 

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[Daniel LaLiberte]

Nick,

You can specify the row indices in the view property for a ChartWrapper.  But no logical operations other than what you can specify in a query property, if you also use a dataSourceUrl.  That might be enough for you, but I can see that it would be useful to do query operations on local data in a way that avoids code, entirely in a ChartWrapper spec.

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