Pocketquery: how to display a bar chart with annotations on bars

Stefano Coletta_gqvq5f

From the official Google docs about Google Charts I see in the example "Density of Precious Metals, in g/cm^3" I can annotate the value of the bars at its end by adding

var view = new google.visualization.DataView(data);
      view.setColumns([0, 1,
                       { calc: "stringify",
                         sourceColumn: 1,
                         type: "string",
                         role: "annotation" },
                       2]);

And then pass view at the draw() function.

 

My current code to display a bar is simple as:

<script>
PocketQuery.chart('BarChart', {
  height: 700,
  chartArea: {
    height: '100%',
    width: '50%'
  }
});
</script>

How can I add annotations like that by using PocketQuery? Which is the correct call?

Thank you for any help.

Felix Grund (Scandio)

Hi Stefano,

Sorry for the late reply! In your case, you need to manipulate the data array for the charts. You can achieve this that way:

<script>
(function() {
    // Create a new data table object in which the first row already contains
    // the table headers.
    var dataTable = [['col1', 'col2', {role: 'style'}]];
     
    // Iterate through the PocketQuery result and add the values to the data table. You can do arbitrary manipulations with the data before.
    jQuery.each(PocketQuery.queryArray(), function(index, row) {
        dataTable.push([row.col1, row.col2, '#ccc']);
    });
 
    PocketQuery.chart('AnnotationChart', {dataTable: dataTable});
}());
</script>

You should try around in your developer tools and the JS debugger to dig more into this surrounding. Let me know if you need further help!

Regards, Felix [Scandio]