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Visualization: Bubble Chart

Overview

A bubble chart that is rendered within the browser using SVG or VML. Displays tips when hovering over bubbles.

A bubble chart is used to visualize a data set with two to four dimensions. The first two dimensions are visualized as coordinates, the third as color and the fourth as size.

Example

<html>
  <head>
    <script type="text/javascript" src="https://www.google.com/jsapi"></script>
    <script type="text/javascript">
    google.load("visualization", "1", {packages:["corechart"]});
    google.setOnLoadCallback(drawSeriesChart);

    function drawSeriesChart() {

      var data = google.visualization.arrayToDataTable([
        ['ID', 'Life Expectancy', 'Fertility Rate', 'Region',     'Population'],
        ['CAN',    80.66,              1.67,      'North America',  33739900],
        ['DEU',    79.84,              1.36,      'Europe',         81902307],
        ['DNK',    78.6,               1.84,      'Europe',         5523095],
        ['EGY',    72.73,              2.78,      'Middle East',    79716203],
        ['GBR',    80.05,              2,         'Europe',         61801570],
        ['IRN',    72.49,              1.7,       'Middle East',    73137148],
        ['IRQ',    68.09,              4.77,      'Middle East',    31090763],
        ['ISR',    81.55,              2.96,      'Middle East',    7485600],
        ['RUS',    68.6,               1.54,      'Europe',         141850000],
        ['USA',    78.09,              2.05,      'North America',  307007000]
      ]);

      var options = {
        title: 'Correlation between life expectancy, fertility rate and population of some world countries (2010)',
        hAxis: {title: 'Life Expectancy'},
        vAxis: {title: 'Fertility Rate'},
        bubble: {textStyle: {fontSize: 11}}
      };

      var chart = new google.visualization.BubbleChart(document.getElementById('series_chart_div'));
      chart.draw(data, options);
    }
    </script>
  </head>
  <body>
    <div id="series_chart_div" style="width: 900px; height: 500px;"></div>
  </body>
</html>

Color By Numbers

You can use the colorAxis option to color the bubbles in proportion to a value, as shown in the example below.

<html>
  <head>
    <script type="text/javascript" src="https://www.google.com/jsapi"></script>
    <script type="text/javascript">
      google.load("visualization", "1", {packages:["corechart"]});
      google.setOnLoadCallback(drawChart);
      function drawChart() {
        var data = google.visualization.arrayToDataTable([
          ['ID', 'X', 'Y', 'Temperature'],
          ['',   80,  167,      120],
          ['',   79,  136,      130],
          ['',   78,  184,      50],
          ['',   72,  278,      230],
          ['',   81,  200,      210],
          ['',   72,  170,      100],
          ['',   68,  477,      80]
        ]);

        var options = {
          colorAxis: {colors: ['yellow', 'red']}
        };

        var chart = new google.visualization.BubbleChart(document.getElementById('chart_div'));
        chart.draw(data, options);
      }
    </script>
  </head>
  <body>
    <div id="chart_div" style="width: 900px; height: 500px;"></div>
  </body>
</html>

Customizing Labels

You can control the bubble typeface, font, and color with the bubble.textStyle option:

Options
  var options = {
    title: 'Correlation between life expectancy, fertility rate and population of some world countries (2010)',
    hAxis: {title: 'Life Expectancy'},
    vAxis: {title: 'Fertility Rate'},
    bubble: {
      textStyle: {
        fontSize: 12,
        fontName: 'Times-Roman',
        color: 'green',
        bold: true,
        italic: true
      }
    }
  };
JavaScript
<head>
  <script type="text/javascript" src="https://www.google.com/jsapi"></script>
  <script type="text/javascript">
    google.load("visualization", "1", {packages:["corechart"]});
    google.setOnLoadCallback(drawChart);

    function drawChart() {

      var data = google.visualization.arrayToDataTable([
        ['ID', 'Life Expectancy', 'Fertility Rate', 'Region',     'Population'],
        ['CAN',    80.66,              1.67,      'North America',  33739900],
        ['DEU',    79.84,              1.36,      'Europe',         81902307],
        ['DNK',    78.6,               1.84,      'Europe',         5523095],
        ['EGY',    72.73,              2.78,      'Middle East',    79716203],
        ['GBR',    80.05,              2,         'Europe',         61801570],
        ['IRN',    72.49,              1.7,       'Middle East',    73137148],
        ['IRQ',    68.09,              4.77,      'Middle East',    31090763],
        ['ISR',    81.55,              2.96,      'Middle East',    7485600],
        ['RUS',    68.6,               1.54,      'Europe',         141850000],
        ['USA',    78.09,              2.05,      'North America',  307007000]
      ]);

      var options = {
        title: 'Correlation between life expectancy, fertility rate and population of some world countries (2010)',
        hAxis: {title: 'Life Expectancy'},
        vAxis: {title: 'Fertility Rate'},
        bubble: {
          textStyle: {
            fontSize: 12,
            fontName: 'Times-Roman',
            color: 'green',
            bold: true,
            italic: true
          }
        }
      };

      var chart = new google.visualization.BubbleChart(document.getElementById('textstyle'));

      chart.draw(data, options);
    }
  </script>
</head>
<body>
  <div id="textstyle" style="width: 900px; height: 500px;"></div>
</body>
</html>

Labels on the above chart are hard to read, and one of the reasons is the white space around them. That's called an aura, and if you'd prefer your charts without them, you can set bubble.textStyle.auraColor to 'none'.

Options
  var options = {
    title: 'Correlation between life expectancy, fertility rate and population of some world countries (2010)',
    hAxis: {title: 'Life Expectancy'},
    vAxis: {title: 'Fertility Rate'},
    bubble: {
      textStyle: {
        auraColor: 'none'
      }
    }
  };
JavaScript
<head>
  <script type="text/javascript" src="https://www.google.com/jsapi"></script>
  <script type="text/javascript">
    google.load("visualization", "1", {packages:["corechart"]});
    google.setOnLoadCallback(drawChart);

    function drawChart() {

      var data = google.visualization.arrayToDataTable([
        ['ID', 'Life Expectancy', 'Fertility Rate', 'Region',     'Population'],
        ['CAN',    80.66,              1.67,      'North America',  33739900],
        ['DEU',    79.84,              1.36,      'Europe',         81902307],
        ['DNK',    78.6,               1.84,      'Europe',         5523095],
        ['EGY',    72.73,              2.78,      'Middle East',    79716203],
        ['GBR',    80.05,              2,         'Europe',         61801570],
        ['IRN',    72.49,              1.7,       'Middle East',    73137148],
        ['IRQ',    68.09,              4.77,      'Middle East',    31090763],
        ['ISR',    81.55,              2.96,      'Middle East',    7485600],
        ['RUS',    68.6,               1.54,      'Europe',         141850000],
        ['USA',    78.09,              2.05,      'North America',  307007000]
      ]);

      var options = {
        title: 'Correlation between life expectancy, fertility rate and population of some world countries (2010)',
        hAxis: {title: 'Life Expectancy'},
        vAxis: {title: 'Fertility Rate'},
        bubble: {
          textStyle: {
            auraColor: 'none',
          }
        }
      };

      var chart = new google.visualization.BubbleChart(document.getElementById('noAura'));

      chart.draw(data, options);
    }
  </script>
</head>
<body>
  <div id="noAura" style="width: 900px; height: 500px;"></div>
</body>
</html>

Loading

The google.load package name is "corechart".

  google.load("visualization", "1", {packages: ["corechart"]});

The visualization's class name is google.visualization.BubbleChart.

  var visualization = new google.visualization.BubbleChart(container);

Data Format

Rows: Each row in the table represents a single bubble.

Columns:

  Column 0 Column 1 Column 2 Column 3 (optional) Column 4 (optional)
Purpose: ID (name) of the bubble X coordinate Y coordinate Either a series ID or a value representing a color on a gradient scale, depending on the column type:
  • string
    A string that identifies bubbles in the same series. Use the same value to identify all bubbles that belong to the same series; bubbles in the same series will be assigned the same color. Series can be configured using the series option.
  • number
    A value that is mapped to an actual color on a gradient scale using the colorAxis option.
Size; values in this column are mapped to actual pixel values using the sizeAxis option.
Data Type: string number number string or number number

Configuration Options

Name
animation.duration

The duration of the animation, in milliseconds. For details, see the animation documentation.

Type: number
Default: 0
animation.easing

The easing function applied to the animation. The following options are available:

  • 'linear' - Constant speed.
  • 'in' - Ease in - Start slow and speed up.
  • 'out' - Ease out - Start fast and slow down.
  • 'inAndOut' - Ease in and out - Start slow, speed up, then slow down.
Type: string
Default: 'linear'
animation.startup

Determines if the chart will animate on the initial draw. If true, the chart will start at the baseline and animate to its final state.

Type: boolean
Default false
axisTitlesPosition

Where to place the axis titles, compared to the chart area. Supported values:

  • in - Draw the axis titles inside the the chart area.
  • out - Draw the axis titles outside the chart area.
  • none - Omit the axis titles.
Type: string
Default: 'out'
backgroundColor

The background color for the main area of the chart. Can be either a simple HTML color string, for example: 'red' or '#00cc00', or an object with the following properties.

Type: string or object
Default: 'white'
backgroundColor.stroke

The color of the chart border, as an HTML color string.

Type: string
Default: '#666'
backgroundColor.strokeWidth

The border width, in pixels.

Type: number
Default: 0
backgroundColor.fill

The chart fill color, as an HTML color string.

Type: string
Default: 'white'
bubble

An object with members to configure the visual properties of the bubbles.

Type: object
Default: null
bubble.opacity

The opacity of the bubbles, where 0 is fully transparent and 1 is fully opaque.

Type: number between 0.0 and 1.0
Default: 0.8
bubble.stroke

The color of the bubbles' stroke.

Type: string
Default: '#ccc'
bubble.textStyle

An object that specifies the bubble text style. The object has this format:

{color: <string>, fontName: <string>, fontSize: <number>}

The color can be any HTML color string, for example: 'red' or '#00cc00'. Also see fontName and fontSize.

Type: object
Default: {color: 'black', fontName: <global-font-name>, fontSize: <global-font-size>}
chartArea

An object with members to configure the placement and size of the chart area (where the chart itself is drawn, excluding axis and legends). Two formats are supported: a number, or a number followed by %. A simple number is a value in pixels; a number followed by % is a percentage. Example: chartArea:{left:20,top:0,width:'50%',height:'75%'}

Type: object
Default: null
chartArea.backgroundColor
Chart area background color. When a string is used, it can be either a hex string (e.g., '#fdc') or an English color name. When an object is used, the following properties can be provided:
  • stroke: the color, provided as a hex string or English color name.
  • strokeWidth: if provided, draws a border around the chart area of the given width (and with the color of stroke).
Type: string or object
Default: 'white'
chartArea.left

How far to draw the chart from the left border.

Type: number or string
Default: auto
chartArea.top

How far to draw the chart from the top border.

Type: number or string
Default: auto
chartArea.width

Chart area width.

Type: number or string
Default: auto
chartArea.height

Chart area height.

Type: number or string
Default: auto
colors

The colors to use for the chart elements. An array of strings, where each element is an HTML color string, for example: colors:['red','#004411'].

Type: Array of strings
Default: default colors
colorAxis

An object that specifies a mapping between color column values and colors or a gradient scale. To specify properties of this object, you can use object literal notation, as shown here:

 {minValue: 0,  colors: ['#FF0000', '#00FF00']}
Type: object
Default: null
colorAxis.minValue

If present, specifies a minimum value for chart color data. Color data values of this value and lower will be rendered as the first color in the colorAxis.colors range.

Type: number
Default: Minimum value of color column in chart data
colorAxis.maxValue

If present, specifies a maximum value for chart color data. Color data values of this value and higher will be rendered as the last color in the colorAxis.colors range.

Type: number
Default: Maximum value of color column in chart data
colorAxis.values

If present, controls how values are associated with colors. Each value is associated with the corresponding color in the colorAxis.colors array. These values apply to the chart color data. Coloring is done according to a gradient of the values specified here. Not specifying a value for this option is equivalent to specifying [minValue, maxValue].

Type: array of numbers
Default: null
colorAxis.colors

Colors to assign to values in the visualization. An array of strings, where each element is an HTML color string, for example: colorAxis: {colors:['red','#004411']}. You must have at least two values; the gradient will include all your values, plus calculated intermediary values, with the first color as the smallest value, and the last color as the highest.

Type: array of color strings
Default: null
colorAxis.legend

An object that specifies the style of the gradient color legend.

Type: object
Default: null
colorAxis.legend.position

Position of the legend. Can be one of the following:

  • 'top' - Above the chart.
  • 'bottom' - Below the chart.
  • 'in' - Inside the chart, at the top.
  • 'none' - No legend is displayed.
Type: object
Default: 'top'
colorAxis.legend.textStyle

An object that specifies the legend text style. The object has this format:

{color: <string>, fontName: <string>, fontSize: <number>}

The color can be any HTML color string, for example: 'red' or '#00cc00'. Also see fontName and fontSize.

Type: object
Default: {color: 'black', fontName: <global-font-name>, fontSize: <global-font-size>}
colorAxis.legend.numberFormat

A format string for numeric labels. This is a subset of the ICU pattern set . For instance, {numberFormat:'.##'} will display values "10.66", "10.6", and "10.0" for values 10.666, 10.6, and 10.

Type: string
Default: auto
enableInteractivity

Whether the chart throws user-based events or reacts to user interaction. If false, the chart will not throw 'select' or other interaction-based events (but will throw ready or error events), and will not display hovertext or otherwise change depending on user input.

Type: boolean
Default: true
explorer

The explorer option allows users to pan and zoom Google charts. explorer: {} provides the default explorer behavior, enabling users to pan horizontally and vertically by dragging, and to zoom in and out by scrolling.

This feature is experimental and may change in future releases.

Note: The explorer only works with continuous axes (such as numbers or dates).

Type: object
Default: null
explorer.actions

The Google Charts explorer supports three actions:

  • dragToPan: Drag to pan around the chart horizontally and vertically. To pan only along the horizontal axis, use explorer: { axis: 'horizontal' }. Similarly for the vertical axis.
  • dragToZoom: The explorer's default behavior is to zoom in and out when the user scrolls. If explorer: { actions: ['dragToZoom', 'rightClickToReset'] } is used, dragging across a rectangular area zooms into that area. We recommend using rightClickToReset whenever dragToZoom is used. See explorer.maxZoomIn, explorer.maxZoomOut, and explorer.zoomDelta for zoom customizations.
  • rightClickToReset: Right clicking on the chart returns it to the original pan and zoom level.
Type: Array of strings
Default: ['dragToPan', 'rightClickToReset']
explorer.axis

By default, users can pan both horizontally and vertically when the explorer option is used. If you want to users to only pan horizontally, use explorer: { axis: 'horizontal' }. Similarly, explorer: { axis: 'vertical' } enables vertical-only panning.

Type: string
Default: both horizontal and vertical panning
explorer.keepInBounds

By default, users can pan all around, regardless of where the data is. To ensure that users don't pan beyond the original chart, use explorer: { keepInBounds: true }.

Type: boolean
Default: false
explorer.maxZoomIn

The maximum that the explorer can zoom in. By default, users will be able to zoom in enough that they'll see only 25% of the original view. Setting explorer: { maxZoomIn: .5 } would let users zoom in only far enough to see half of the original view.

Type: number
Default: 0.25
explorer.maxZoomOut

The maximum that the explorer can zoom out. By default, users will be able to zoom out far enough that the chart will take up only 1/4 of the available space. Setting explorer: { maxZoomOut: 8 } would let users zoom out far enough that the chart would take up only 1/8 of the available space.

Type: number
Default: 4
explorer.zoomDelta

When users zoom in or out, explorer.zoomDelta determines how much they zoom by. The smaller the number, the smoother and slower the zoom.

Type: number
Default: 1.5
fontSize

The default font size, in pixels, of all text in the chart. You can override this using properties for specific chart elements.

Type: number
Default: automatic
fontName

The default font face for all text in the chart. You can override this using properties for specific chart elements.

Type: string
Default: 'Arial'
forceIFrame

Draws the chart inside an inline frame. (Note that on IE8, this option is ignored; all IE8 charts are drawn in i-frames.)

Type: boolean
Default: false
hAxis

An object with members to configure various horizontal axis elements. To specify properties of this object, you can use object literal notation, as shown here:

{
  title: 'Hello',
  titleTextStyle: {
    color: '#FF0000'
  }
}
    
Type: object
Default: null
hAxis.baseline

The baseline for the horizontal axis.

Type: number
Default: automatic
hAxis.baselineColor

The color of the baseline for the horizontal axis. Can be any HTML color string, for example: 'red' or '#00cc00'.

Type: number
Default: 'black'
hAxis.direction

The direction in which the values along the horizontal axis grow. Specify -1 to reverse the order of the values.

Type: 1 or -1
Default: 1
hAxis.format

A format string for numeric axis labels. This is a subset of the ICU pattern set . For instance, {format:'#,###%'} will display values "1,000%", "750%", and "50%" for values 10, 7.5, and 0.5. You can also supply any of the following:

  • {format: 'none'}: displays numbers with no formatting (e.g., 8000000)
  • {format: 'decimal'}: displays numbers with thousands separators (e.g., 8,000,000)
  • {format: 'scientific'}: displays numbers in scientific notation (e.g., 8e6)
  • {format: 'currency'}: displays numbers in the local currency (e.g., $8,000,000.00)
  • {format: 'percent'}: displays numbers as percentages (e.g., 800,000,000%)
  • {format: 'short'}: displays abbreviated numbers (e.g., 8M)
  • {format: 'long'}: displays numbers as full words (e.g., 8 million)

The actual formatting applied to the label is derived from the locale the API has been loaded with. For more details, see loading charts with a specific locale .

Type: string
Default: auto
hAxis.gridlines

An object with members to configure the gridlines on the horizontal axis. To specify properties of this object, you can use object literal notation, as shown here:

{color: '#333', count: 4}
Type: object
Default: null
hAxis.gridlines.color

The color of the horizontal gridlines inside the chart area. Specify a valid HTML color string.

Type: string
Default: '#CCC'
hAxis.gridlines.count

The number of horizontal gridlines inside the chart area. Minimum value is 2. Specify -1 to automatically compute the number of gridlines.

Type: number
Default: 5
hAxis.gridlines.units

Overrides the default format for various aspects of date/datetime/timeofday data types when used with chart computed gridlines. Allows formatting for years, months, days, hours, minutes, seconds, and milliseconds.

General format is:

gridlines: {
  units: {
    years: {format: [/*format strings here*/]},
    months: {format: [/*format strings here*/]},
    days: {format: [/*format strings here*/]}
    hours: {format: [/*format strings here*/]}
    minutes: {format: [/*format strings here*/]}
    seconds: {format: [/*format strings here*/]},
    milliseconds: {format: [/*format strings here*/]},
  }
}
    

Additional information can be found in Dates and Times.

Type: object
Default: null
hAxis.minorGridlines

An object with members to configure the minor gridlines on the horizontal axis, similar to the hAxis.gridlines option.

Type: object
Default: null
hAxis.minorGridlines.color

The color of the horizontal minor gridlines inside the chart area. Specify a valid HTML color string.

Type: string
Default: A blend of the gridline and background colors
hAxis.minorGridlines.count

The number of horizontal minor gridlines between two regular gridlines.

Type: number
Default: 0
hAxis.minorGridlines.units

Overrides the default format for various aspects of date/datetime/timeofday data types when used with chart computed minorGridlines. Allows formatting for years, months, days, hours, minutes, seconds, and milliseconds.

General format is:

gridlines: {
  units: {
    years: {format: [/*format strings here*/]},
    months: {format: [/*format strings here*/]},
    days: {format: [/*format strings here*/]}
    hours: {format: [/*format strings here*/]}
    minutes: {format: [/*format strings here*/]}
    seconds: {format: [/*format strings here*/]},
    milliseconds: {format: [/*format strings here*/]},
  }
}
    

Additional information can be found in Dates and Times.

Type: object
Default: null
hAxis.logScale

hAxis property that makes the horizontal axis a logarithmic scale (requires all values to be positive). Set to true for yes.

Type: boolean
Default: false
hAxis.textPosition

Position of the horizontal axis text, relative to the chart area. Supported values: 'out', 'in', 'none'.

Type: string
Default: 'out'
hAxis.textStyle

An object that specifies the horizontal axis text style. The object has this format:

{ color: <string>,
  fontName: <string>,
  fontSize: <number>,
  bold: <boolean>,
  italic: <boolean> }
    

The color can be any HTML color string, for example: 'red' or '#00cc00'. Also see fontName and fontSize.

Type: object
Default: {color: 'black', fontName: <global-font-name>, fontSize: <global-font-size>}
hAxis.ticks

Replaces the automatically generated X-axis ticks with the specified array. Each element of the array should be either a valid tick value (such as a number, date, datetime, or timeofday), or an object. If it's an object, it should have a v property for the tick value, and an optional f property containing the literal string to be displayed as the label.

Examples:

  • hAxis: { ticks: [5,10,15,20] }
  • hAxis: { ticks: [{v:32, f:'thirty two'}, {v:64, f:'sixty four'}] }
  • hAxis: { ticks: [new Date(2014,3,15), new Date(2013,5,15)] }
  • hAxis: { ticks: [16, {v:32, f:'thirty two'}, {v:64, f:'sixty four'}, 128] }
Type: Array of elements
Default: auto
hAxis.title

hAxis property that specifies the title of the horizontal axis.

Type: string
Default: null
hAxis.titleTextStyle

An object that specifies the horizontal axis title text style. The object has this format:

{ color: <string>,
  fontName: <string>,
  fontSize: <number>,
  bold: <boolean>,
  italic: <boolean> }
    

The color can be any HTML color string, for example: 'red' or '#00cc00'. Also see fontName and fontSize.

Type: object
Default: {color: 'black', fontName: <global-font-name>, fontSize: <global-font-size>}
hAxis.maxValue

Moves the max value of the horizontal axis to the specified value; this will be rightward in most charts. Ignored if this is set to a value smaller than the maximum x-value of the data. hAxis.viewWindow.max overrides this property.

Type: number
Default: automatic
hAxis.minValue

Moves the min value of the horizontal axis to the specified value; this will be leftward in most charts. Ignored if this is set to a value greater than the minimum x-value of the data. hAxis.viewWindow.min overrides this property.

Type: number
Default: automatic
hAxis.viewWindowMode

Specifies how to scale the horizontal axis to render the values within the chart area. The following string values are supported:

  • 'pretty' - Scale the horizontal values so that the maximum and minimum data values are rendered a bit inside the left and right of the chart area. This will cause haxis.viewWindow.min and haxis.viewWindow.max to be ignored.
  • 'maximized' - Scale the horizontal values so that the maximum and minimum data values touch the left and right of the chart area. This will cause haxis.viewWindow.min and haxis.viewWindow.max to be ignored.
  • 'explicit' - A deprecated option for specifying the left and right scale values of the chart area. (Deprecated because it's redundant with haxis.viewWindow.min and haxis.viewWindow.max.) Data values outside these values will be cropped. You must specify an hAxis.viewWindow object describing the maximum and minimum values to show.
Type: string
Defaut: Equivalent to 'pretty', but haxis.viewWindow.min and haxis.viewWindow.max take precedence if used.
hAxis.viewWindow

Specifies the cropping range of the horizontal axis.

Type: object
Default: null
hAxis.viewWindow.max

The maximum horizontal data value to render.

Ignored when hAxis.viewWindowMode is 'pretty' or 'maximized'.

Type: number
Default: auto
hAxis.viewWindow.min

The minimum horizontal data value to render.

Ignored when hAxis.viewWindowMode is 'pretty' or 'maximized'.

Type: number
Default: auto
height

Height of the chart, in pixels.

Type: number
Default: height of the containing element
legend

An object with members to configure various aspects of the legend. To specify properties of this object, you can use object literal notation, as shown here:

{position: 'top', textStyle: {color: 'blue', fontSize: 16}}
Type: object
Default: null
legend.alignment

Alignment of the legend. Can be one of the following:

  • 'start' - Aligned to the start of the area allocated for the legend.
  • 'center' - Centered in the area allocated for the legend.
  • 'end' - Aligned to the end of the area allocated for the legend.

Start, center, and end are relative to the style -- vertical or horizontal -- of the legend. For example, in a 'right' legend, 'start' and 'end' are at the top and bottom, respectively; for a 'top' legend, 'start' and 'end' would be at the left and right of the area, respectively.

The default value depends on the legend's position. For 'bottom' legends, the default is 'center'; other legends default to 'start'.

Type: string
Default: automatic
legend.maxLines

Maximum number of lines in the legend. Set this to a number greater than one to add lines to your legend. Note: The exact logic used to determine the actual number of lines rendered is still in flux.

This option currently works only when legend.position is 'top'.

Type: number
Default: 1
legend.position

Position of the legend. Can be one of the following:

  • 'bottom' - Below the chart.
  • 'left' - To the left of the chart, provided the left axis has no series associated with it. So if you want the legend on the left, use the option targetAxisIndex: 1.
  • 'in' - Inside the chart, by the top left corner.
  • 'none' - No legend is displayed.
  • 'right' - To the right of the chart. Incompatible with the vAxes option.
  • 'top' - Above the chart.
Type: string
Default: 'right'
legend.textStyle

An object that specifies the legend text style. The object has this format:

{ color: <string>,
  fontName: <string>,
  fontSize: <number>,
  bold: <boolean>,
  italic: <boolean> }
    

The color can be any HTML color string, for example: 'red' or '#00cc00'. Also see fontName and fontSize.

Type: object
Default: {color: 'black', fontName: <global-font-name>, fontSize: <global-font-size>}
selectionMode

When selectionMode is 'multiple', users may select multiple data points.

Type: string
Default: 'single'
series

An object of objects, where the keys are series names (the values in the Color column) and each object describing the format of the corresponding series in the chart. If a series or a value is not specified, the global value will be used. Each object supports the following properties:

  • color - The color to use for this series. Specify a valid HTML color string.
  • visibleInLegend - A boolean value, where true means that the series should have a legend entry, and false means that it should not. Default is true.
Example:
series: {'Europe': {color: 'green'}}
Type: Object with nested objects
Default: {}
sizeAxis

An object with members to configure how values are associated with bubble size. To specify properties of this object, you can use object literal notation, as shown here:

 {minValue: 0,  maxSize: 20}
Type: object
Default: null
sizeAxis.maxSize

Maximum radius of the largest possible bubble, in pixels.

Type: number
Default: 30
sizeAxis.maxValue

The size value (as appears in the chart data) to be mapped to sizeAxis.maxSize. Larger values will be cropped to this value.

Type: number
Default: Maximum value of size column in chart data
sizeAxis.minSize

Mininum radius of the smallest possible bubble, in pixels.

Type: number
Default: 5
sizeAxis.minValue

The size value (as appears in the chart data) to be mapped to sizeAxis.minSize. Smaller values will be cropped to this value.

Type: number
Default: Minimum value of size column in chart data
sortBubblesBySize

If true, sorts the bubbles by size so the smaller bubbles appear above the larger bubbles. If false, bubbles are sorted according to their order in the DataTable.

Type: boolean
Default: true
theme

A theme is a set of predefined option values that work together to achieve a specific chart behavior or visual effect. Currently only one theme is available:

  • 'maximized' - Maximizes the area of the chart, and draws the legend and all of the labels inside the chart area. Sets the following options:
    chartArea: {width: '100%', height: '100%'},
    legend: {position: 'in'},
    titlePosition: 'in', axisTitlesPosition: 'in',
    hAxis: {textPosition: 'in'}, vAxis: {textPosition: 'in'}
            
Type: string
Default: null
title

Text to display above the chart.

Type: string
Default: no title
titlePosition

Where to place the chart title, compared to the chart area. Supported values:

  • in - Draw the title inside the chart area.
  • out - Draw the title outside the chart area.
  • none - Omit the title.
Type: string
Default: 'out'
titleTextStyle

An object that specifies the title text style. The object has this format:

{ color: <string>,
  fontName: <string>,
  fontSize: <number>,
  bold: <boolean>,
  italic: <boolean> }
    

The color can be any HTML color string, for example: 'red' or '#00cc00'. Also see fontName and fontSize.

Type: object
Default: {color: 'black', fontName: <global-font-name>, fontSize: <global-font-size>}
tooltip

An object with members to configure various tooltip elements. To specify properties of this object, you can use object literal notation, as shown here:

{textStyle: {color: '#FF0000'}, showColorCode: true}
Type: object
Default: null
tooltip.isHtml

If set to true, use HTML-rendered (rather than SVG-rendered) tooltips. See Customizing Tooltip Content for more details.

Note: customization of the HTML tooltip content via the tooltip column data role is not supported by the Bubble Chart visualization.

Type: boolean
Default: false
tooltip.textStyle

An object that specifies the tooltip text style. The object has this format:

{ color: <string>,
  fontName: <string>,
  fontSize: <number>,
  bold: <boolean>,
  italic: <boolean> }
    

The color can be any HTML color string, for example: 'red' or '#00cc00'. Also see fontName and fontSize.

Type: object
Default: {color: 'black', fontName: <global-font-name>, fontSize: <global-font-size>}
tooltip.trigger

The user interaction that causes the tooltip to be displayed:

  • 'focus' - The tooltip will be displayed when the user hovers over the element.
  • 'none' - The tooltip will not be displayed.
  • 'selection' - The tooltip will be displayed when the user selects the element.
Type: string
Default: 'focus'
vAxis

An object with members to configure various vertical axis elements. To specify properties of this object, you can use object literal notation, as shown here:

{title: 'Hello', titleTextStyle: {color: '#FF0000'}}
Type: object
Default: null
vAxis.baseline

vAxis property that specifies the baseline for the vertical axis. If the baseline is larger than the highest grid line or smaller than the lowest grid line, it will be rounded to the closest gridline.

Type: number
Default: automatic
vAxis.baselineColor

Specifies the color of the baseline for the vertical axis. Can be any HTML color string, for example: 'red' or '#00cc00'.

Type: number
Default: 'black'
vAxis.direction

The direction in which the values along the vertical axis grow. Specify -1 to reverse the order of the values.

Type: 1 or -1
Default: 1
vAxis.format

A format string for numeric axis labels. This is a subset of the ICU pattern set . For instance, {format:'#,###%'} will display values "1,000%", "750%", and "50%" for values 10, 7.5, and 0.5. You can also supply any of the following:

  • {format: 'none'}: displays numbers with no formatting (e.g., 8000000)
  • {format: 'decimal'}: displays numbers with thousands separators (e.g., 8,000,000)
  • {format: 'scientific'}: displays numbers in scientific notation (e.g., 8e6)
  • {format: 'currency'}: displays numbers in the local currency (e.g., $8,000,000.00)
  • {format: 'percent'}: displays numbers as percentages (e.g., 800,000,000%)
  • {format: 'short'}: displays abbreviated numbers (e.g., 8M)
  • {format: 'long'}: displays numbers as full words (e.g., 8 million)

The actual formatting applied to the label is derived from the locale the API has been loaded with. For more details, see loading charts with a specific locale .

Type: string
Default: auto
vAxis.gridlines

An object with members to configure the gridlines on the vertical axis. To specify properties of this object, you can use object literal notation, as shown here:

{color: '#333', count: 4}
Type: object
Default: null
vAxis.gridlines.color

The color of the vertical gridlines inside the chart area. Specify a valid HTML color string.

Type: string
Default: '#CCC'
vAxis.gridlines.count

The number of vertical gridlines inside the chart area. Minimum value is 2. Specify -1 to automatically compute the number of gridlines.

Type: number
Default: 5
vAxis.gridlines.units

Overrides the default format for various aspects of date/datetime/timeofday data types when used with chart computed gridlines. Allows formatting for years, months, days, hours, minutes, seconds, and milliseconds.

General format is:

gridlines: {
  units: {
    years: {format: [/*format strings here*/]},
    months: {format: [/*format strings here*/]},
    days: {format: [/*format strings here*/]}
    hours: {format: [/*format strings here*/]}
    minutes: {format: [/*format strings here*/]}
    seconds: {format: [/*format strings here*/]},
    milliseconds: {format: [/*format strings here*/]},
  }
}
    

Additional information can be found in Dates and Times.

Type: object
Default: null
vAxis.minorGridlines

An object with members to configure the minor gridlines on the vertical axis, similar to the vAxis.gridlines option.

Type: object
Default: null
vAxis.minorGridlines.color

The color of the vertical minor gridlines inside the chart area. Specify a valid HTML color string.

Type: string
Default: A blend of the gridline and background colors
vAxis.minorGridlines.count

The number of vertical minor gridlines between two regular gridlines.

Type: number
Default: 0
vAxis.minorGridlines.units

Overrides the default format for various aspects of date/datetime/timeofday data types when used with chart computed minorGridlines. Allows formatting for years, months, days, hours, minutes, seconds, and milliseconds.

General format is:

gridlines: {
  units: {
    years: {format: [/*format strings here*/]},
    months: {format: [/*format strings here*/]},
    days: {format: [/*format strings here*/]}
    hours: {format: [/*format strings here*/]}
    minutes: {format: [/*format strings here*/]}
    seconds: {format: [/*format strings here*/]},
    milliseconds: {format: [/*format strings here*/]},
  }
}
    

Additional information can be found in Dates and Times.

Type: object
Default: null
vAxis.logScale

If true, makes the vertical axis a logarithmic scale. Note: All values must be positive.

Type: boolean
Default: false
vAxis.textPosition

Position of the vertical axis text, relative to the chart area. Supported values: 'out', 'in', 'none'.

Type: string
Default: 'out'
vAxis.textStyle

An object that specifies the vertical axis text style. The object has this format:

{ color: <string>,
  fontName: <string>,
  fontSize: <number>,
  bold: <boolean>,
  italic: <boolean> }
    

The color can be any HTML color string, for example: 'red' or '#00cc00'. Also see fontName and fontSize.

Type: object
Default: {color: 'black', fontName: <global-font-name>, fontSize: <global-font-size>}
vAxis.ticks

Replaces the automatically generated Y-axis ticks with the specified array. Each element of the array should be either a valid tick value (such as a number, date, datetime, or timeofday), or an object. If it's an object, it should have a v property for the tick value, and an optional f property containing the literal string to be displayed as the label.

Examples:

  • vAxis: { ticks: [5,10,15,20] }
  • vAxis: { ticks: [{v:32, f:'thirty two'}, {v:64, f:'sixty four'}] }
  • vAxis: { ticks: [new Date(2014,3,15), new Date(2013,5,15)] }
  • vAxis: { ticks: [16, {v:32, f:'thirty two'}, {v:64, f:'sixty four'}, 128] }
Type: Array of elements
Default: auto
vAxis.title

vAxis property that specifies a title for the vertical axis.

Type: string
Default: no title
vAxis.titleTextStyle

An object that specifies the vertical axis title text style. The object has this format:

{ color: <string>,
  fontName: <string>,
  fontSize: <number>,
  bold: <boolean>,
  italic: <boolean> }
  

The color can be any HTML color string, for example: 'red' or '#00cc00'. Also see fontName and fontSize.

Type: object
Default: {color: 'black', fontName: <global-font-name>, fontSize: <global-font-size>}
vAxis.maxValue

Moves the max value of the vertical axis to the specified value; this will be upward in most charts. Ignored if this is set to a value smaller than the maximum y-value of the data. vAxis.viewWindow.max overrides this property.

Type: number
Default: automatic
vAxis.minValue

Moves the min value of the vertical axis to the specified value; this will be downward in most charts. Ignored if this is set to a value greater than the minimum y-value of the data. vAxis.viewWindow.min overrides this property.

Type: number
Default: automatic
vAxis.viewWindowMode

Specifies how to scale the vertical axis to render the values within the chart area. The following string values are supported:

  • 'pretty' - Scale the vertical values so that the maximum and minimum data values are rendered a bit inside the top and bottom of the chart area. This will cause vaxis.viewWindow.min and vaxis.viewWindow.max to be ignored.
  • 'maximized' - Scale the vertical values so that the maximum and minimum data values touch the top and bottom of the chart area. This will cause vaxis.viewWindow.min and vaxis.viewWindow.max to be ignored.
  • 'explicit' - A deprecated option for specifying the top and bottom scale values of the chart area. (Deprecated because it's redundant with vaxis.viewWindow.min and vaxis.viewWindow.max. Data values outside these values will be cropped. You must specify a vAxis.viewWindow object describing the maximum and minimum values to show.
Type: string
Default: Equivalent to 'pretty', but vaxis.viewWindow.min and vaxis.viewWindow.max take precedence if used.
vAxis.viewWindow

Specifies the cropping range of the vertical axis.

Type: object
Default: null
vAxis.viewWindow.max

The maximum vertical data value to render.

Ignored when vAxis.viewWindowMode is 'pretty' or 'maximized'.

Type: number
Default: auto
vAxis.viewWindow.min

The minimum horizontal data value to render.

Ignored when vAxis.viewWindowMode is 'pretty' or 'maximized'.

Type: number
Default: auto
width

Width of the chart, in pixels.

Type: number
Default: width of the containing element

Methods

Method
draw(data, options)

Draws the chart. The chart accepts further method calls only after the readyevent is fired. Extended description.

Return Type: none
getAction(actionID)

Returns the tooltip action object with the requested actionID.

Return Type: object
getBoundingBox(id)

Returns an object containing the left, top, width, and height of chart element id. The format for id isn't yet documented (they're the return values of event handlers), but here are some examples:

var cli = chart.getChartLayoutInterface();

Height of the chart area
cli.getBoundingBox('chartarea').height
Width of the third bar in the first series of a bar or column chart
cli.getBoundingBox('bar#0#2').width
Bounding box of the fifth wedge of a pie chart
cli.getBoundingBox('slice#4')
Bounding box of the chart data of a vertical (e.g., column) chart:
cli.getBoundingBox('vAxis#0#gridline')
Bounding box of the chart data of a horizontal (e.g., bar) chart:
cli.getBoundingBox('hAxis#0#gridline')

Values are relative to the container of the chart. Call this after the chart is drawn.

Return Type: object
getChartAreaBoundingBox()

Returns an object containing the left, top, width, and height of the chart content (i.e., excluding labels and legend):

var cli = chart.getChartLayoutInterface();

cli.getChartAreaBoundingBox().left
cli.getChartAreaBoundingBox().top
cli.getChartAreaBoundingBox().height
cli.getChartAreaBoundingBox().width

Values are relative to the container of the chart. Call this after the chart is drawn.

Return Type: object
getChartLayoutInterface()

Returns an object containing information about the onscreen placement of the chart and its elements.

The following methods can be called on the returned object:

  • getBoundingBox
  • getChartAreaBoundingBox
  • getHAxisValue
  • getVAxisValue
  • getXLocation
  • getYLocation

Call this after the chart is drawn.

Return Type: object
getHAxisValue(position, optional_axis_index)

Returns the logical horizontal value at position, which is an offset from the chart container's left edge. Can be negative.

Example: chart.getChartLayoutInterface().getHAxisValue(400).

Call this after the chart is drawn.

Return Type: number
getImageURI()

Returns the chart serialized as an image URI.

Call this after the chart is drawn.

See Printing PNG Charts.

Return Type: string
getSelection()

Returns an array of the selected chart entities. Selectable entities are bubbles. For this chart, only one entity can be selected at any given moment. Extended description .

Return Type: Array of selection elements
getVAxisValue(position, optional_axis_index)

Returns the logical vertical value at position, which is an offset from the chart container's top edge. Can be negative.

Example: chart.getChartLayoutInterface().getVAxisValue(300).

Call this after the chart is drawn.

Return Type: number
getXLocation(position, optional_axis_index)

Returns the screen x-coordinate of position relative to the chart's container.

Example: chart.getChartLayoutInterface().getXLocation(400).

Call this after the chart is drawn.

Return Type: number
getYLocation(position, optional_axis_index)

Returns the screen y-coordinate of position relative to the chart's container.

Example: chart.getChartLayoutInterface().getYLocation(300).

Call this after the chart is drawn.

Return Type: number
removeAction(actionID)

Removes the tooltip action with the requested actionID from the chart.

Return Type: none
setAction(action)

Sets a tooltip action to be executed when the user clicks on the action text.

The setAction method takes an object as its action parameter. This object should specify 3 properties: id— the ID of the action being set, text —the text that should appear in the tooltip for the action, and action — the function that should be run when a user clicks on the action text.

Any and all tooltip actions should be set prior to calling the chart's draw() method. Extended description.

Return Type: none
setSelection()

Selects the specified chart entities. Cancels any previous selection. Selectable entities are bubbles. For this chart, only one entity can be selected at a time. Extended description .

Return Type: none
clearChart()

Clears the chart, and releases all of its allocated resources.

Return Type: none

Events

For more information on how to use these events, see Basic Interactivity, Handling Events, and Firing Events.

Name
animationfinish

Fired when transition animation is complete.

Properties: none
click

Fired when the user clicks inside the chart. Can be used to identify when the title, data elements, legend entries, axes, gridlines, or labels are clicked.

Properties: targetID
error

Fired when an error occurs when attempting to render the chart.

Properties: id, message
onmouseover

Fired when the user mouses over a visual entity. Passes back the row and column indices of the corresponding data table element. A bubble correlates to a row in the data table (column index is null).

Properties: row, column
onmouseout

Fired when the user mouses away from a visual entity. Passes back the row and column indices of the corresponding data table element. A bubble correlates to a row in the data table (column index is null).

Properties: row, column
ready

The chart is ready for external method calls. If you want to interact with the chart, and call methods after you draw it, you should set up a listener for this event before you call the draw method, and call them only after the event was fired.

Properties: none
select

Fired when the user clicks a visual entity. To learn what has been selected, call getSelection().

Properties: none

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