Including Google Charts And Adjusting Options

The PocketQuery Javascript API offers a way to draw Google Charts. These work well in combination with Basic Functions For Templates.

A chart is created with the following method:

/**
 * Draws a chart of the given type with the given options.
 */
PocketQuery.chart({String} type, {Object} options)

Type

The type is the chart name, i.e. the name of the respective package as defined by the Google Charts API in camel case. Among others the following chart types are available.

• "AreaChart"

• "BarChart" (version with material design: "Bar")

• "BubbleChart"

• "CandlestickChart"

• "ColumnChart"

• "ComboChart"

• "Gauge"

• "GeoChart"

• "Histogram"

• "LineChart" (version with material design: "Line")

• "OrgChart"

• "PieChart"

• "ScatterChart" (version with material design: "Scatter")

• "SteppedAreaChart"

For a complete list, please refer to the Google Documentation and look up the package name of the chart type you want to draw.

Options

The options object may contain the following:

• all options that the Google Chart draw method expects: new google.visualization.[VisualType]().draw(Options)

• all options that Google Chart format methods expect: new google.visualization.[FormatType](Options)

• dataTable: array-of-arrays containing the dataset to be drawn. This overrides the data taken from the query results. Example: [['Month', 'Value'],['JAN-17', 52.1],['FEB-17', 51.2],['MAR-17', 51.7]]. If you want to create a custom dataTable using the query results, you can use the PocketQuery.query* functions described in Basic Functions For Templates.

• container: CSS selector of the container (e.g. <div> element) where the resulting chart should be rendered. If no container is provided, a new <div> is created.

• beforeDraw: callback function that is applied before the draw function of Google Chart is called. This function receives the prepared dataTable and the full options object as arguments: function(queryResult, options) {}. See the example below.

#  Example usage within a template
## div that will contain the chart
## must be placed above the call of PocketQuery.chart
<div id="my-chart-div"></div>
 
PocketQuery.chart('Table', {
  // options of Google chart method
  title: 'PocketQuery rocks!!!',
  allowHtml: true,
  showRowNumber: true,
  height: 200,
  width: 500,
 
  // overriding the PocketQuery result with a static dataset
  dataTable: [
    ['Month', 'Value'],
    ['JAN-17', 52.1],
    ['FEB-17', 51.2],
    ['MAR-17', 51.7]
  ],
 
  // selecting a specific div for displaying the chart
  container: '#my-chart-div',
 
  // Google Chart formatting, see
  // https://developers.google.com/chart/interactive/docs/reference#formatters
  format: {
    type: 'NumberFormat',
    column: 1,
    options: { // Options that the GC Formatting methods expect
      prefix: '$',
      negativeColor: 'red',
      negativeParens: true
    }
  },
 
  beforeDraw: function(dataTable, options) {
    // Do something on dataTable or options before the chart is drawn.
    // Note: the `options` argument holds a reference to the Google `chart` object
    // which is sometimes needed for advanced functionality with event listeners
  }
   
});