Home components line chart

Line Chart

line

	

		
		

<LineChart 
    data={query_name}  
    x=column_x 
    y=column_y
/>

Examples

Line

line

	

		
		

<LineChart 
    data={daily_complaints} 
    x=date 
    y=number_of_complaints 
    yAxisTitle="calls to Austin 311 per day"
/>

Multi-Series Line

multi-series-line

	

		
		

<LineChart 
    data={daily_volume_yoy} 
    x=day_of_year 
    y=cum_vol 
    series=year 
    yAxisTitle="cumulative calls" 
    xAxisTitle="day of year"
/>

Multi-Series Line with Steps

	

		
		

<LineChart
    data={simpler_bar}
    x=year
    y=value
    series=country
    step=true
/>

Multiple y Columns

multiple-y-line

	

		
		

<LineChart
data={fda_recalls}  
 x=year
y={["voluntary_recalls", "fda_recalls"]}
/>

Because x is the first column in the dataset and we want to plot all the remaining numerical columns in the table, we can simplify our code down to:

	

		
		

<LineChart data={fda_recalls}/>

Evidence will automatically pick the first column as x and use all other numerical columns for y.

Secondary y Axis

	

		
		

<LineChart 
    data={orders_by_month} 
    x=month 
    y=sales_usd0k 
    y2=num_orders_num0
/>

Secondary Axis with Bar

	

		
		

<LineChart 
    data={orders_by_month} 
    x=month 
    y=sales_usd0k 
    y2=num_orders_num0
    y2SeriesType=bar
/>

Value Labels

	

		
		

<LineChart 
    data={orders_by_month} 
    x=month
    y=sales
    yAxisTitle="Sales per Month"
    yFmt=eur0k
    labels=true
/>

Custom Color Palette

	

		
		

<LineChart 
  data={simpler_bar} 
  x=year 
  y=value 
  series=country
  colorPalette={
        [
        '#cf0d06',
        '#eb5752',
        '#e88a87',
        '#fcdad9',
        ]
    }
/>

Options

Data

data
REQUIRED
Query name, wrapped in curly braces
Options:
query name
x
REQUIRED
Column to use for the x-axis of the chart
Options:
column name
y
REQUIRED
Column(s) to use for the y-axis of the chart
Options:
column name | array of column names
y2
Column(s) to include on a secondary y-axis
Options:
column name | array of column names
y2SeriesType
Chart type to apply to the series on the y2 axis
Options:
Default:
line
series
Column to use as the series (groups) in a multi-series chart
Options:
column name
sort
Whether to apply default sort to your data. Default is x ascending for number and date x-axes, and y descending for category x-axes
Options:
Default:
true
handleMissing
Treatment of missing values in the dataset
Options:
Default:
gap
emptySet
Sets behaviour for empty datasets. Can throw an error, a warning, or allow empty. When set to 'error', empty datasets will block builds in `build:strict`. Note this only applies to initial page load - empty datasets caused by input component changes (dropdowns, etc.) are allowed.
Options:
Default:
error
emptyMessage
Text to display when an empty dataset is received - only applies when `emptySet` is 'warn' or 'pass', or when the empty dataset is a result of an input component change (dropdowns, etc.).
Options:
string

Formatting & Styling

xFmt
Format to use for x column
Options:
Excel-style format | built-in format name | custom format name
yFmt
Format to use for y column(s)
Options:
Excel-style format | built-in format name | custom format name
y2Fmt
Format to use for y2 column(s)
Options:
Excel-style format | built-in format name | custom format name
step
Specifies whether the chart is displayed as a step line
Options:
Default:
false
stepPosition
Configures the position of turn points for a step line chart
Options:
Default:
end
lineColor
Color to override default series color. Only accepts a single color
Options:
CSS name | hexademical | RGB | HSL
lineOpacity
% of the full color that should be rendered, with remainder being transparent
Options:
number (0 to 1)
Default:
1
lineType
Options to show breaks in a line (dashed or dotted)
Options:
Default:
solid
lineWidth
Thickness of line (in pixels)
Options:
number
Default:
2
markers
Turn on/off markers (shapes rendered onto the points of a line)
Options:
Default:
false
markerShape
Shape to use if markers=true
Options:
Default:
circle
markerSize
Size of each shape (in pixels)
Options:
number
Default:
8
colorPalette
Array of custom colours to use for the chart. E.g., {['#cf0d06','#eb5752','#e88a87']}
Options:
array of color strings (CSS name | hexademical | RGB | HSL)
seriesColors
Apply a specific color to each series in your chart. Unspecified series will receive colors from the built-in palette as normal. Note the double curly braces required in the syntax `seriesColors=[object Object]`
Options:
object with series names and assigned colors
labels
Show value labels
Options:
Default:
false
labelSize
Font size of value labels
Options:
number
Default:
11
labelPosition
Where label will appear on your series
Options:
Default:
above
labelColor
Font color of value labels
Options:
CSS name | hexademical | RGB | HSL
labelFmt
Format to use for value labels
Options:
Excel-style format | built-in format name | custom format name
yLabelFmt
Format to use for value labels for series on the y axis. Overrides any other formats
Options:
Excel-style format | built-in format name | custom format name
y2LabelFmt
Format to use for value labels for series on the y2 axis. Overrides any other formats
Options:
Excel-style format | built-in format name | custom format name
showAllLabels
Allow all labels to appear on chart, including overlapping labels
Options:
Default:
false

Axes

yLog
Whether to use a log scale for the y-axis
Options:
Default:
false
yLogBase
Base to use when log scale is enabled
Options:
number
Default:
10
xAxisTitle
Name to show under x-axis. If 'true', formatted column name is used. Only works with swapXY=false
Options:
Default:
false
yAxisTitle
Name to show beside y-axis. If 'true', formatted column name is used.
Options:
Default:
false
y2AxisTitle
Name to show beside y2 axis. If 'true', formatted column name is used.
Options:
Default:
false
xGridlines
Turns on/off gridlines extending from x-axis tick marks (vertical lines when swapXY=false)
Options:
Default:
false
yGridlines
Turns on/off gridlines extending from y-axis tick marks (horizontal lines when swapXY=false)
Options:
Default:
true
y2Gridlines
Turns on/off gridlines extending from y2-axis tick marks (horizontal lines when swapXY=false)
Options:
Default:
true
xAxisLabels
Turns on/off value labels on the x-axis
Options:
Default:
true
yAxisLabels
Turns on/off value labels on the y-axis
Options:
Default:
true
y2AxisLabels
Turns on/off value labels on the y2-axis
Options:
Default:
true
xBaseline
Turns on/off thick axis line (line appears at y=0)
Options:
Default:
true
yBaseline
Turns on/off thick axis line (line appears directly alongside the y-axis labels)
Options:
Default:
false
y2Baseline
Turns on/off thick axis line (line appears directly alongside the y2-axis labels)
Options:
Default:
false
xTickMarks
Turns on/off tick marks for each of the x-axis labels
Options:
Default:
false
yTickMarks
Turns on/off tick marks for each of the y-axis labels
Options:
Default:
false
y2TickMarks
Turns on/off tick marks for each of the y2-axis labels
Options:
Default:
false
yMin
Starting value for the y-axis
Options:
number
yMax
Maximum value for the y-axis
Options:
number
yScale
Whether to scale the y-axis to fit your data. `yMin` and `yMax` take precedence over `yScale`
Options:
Default:
false
y2Min
Starting value for the y2-axis
Options:
number
y2Max
Maximum value for the y2-axis
Options:
number
y2Scale
Whether to scale the y-axis to fit your data. `y2Min` and `y2Max` take precedence over `y2Scale`
Options:
Default:
false

Chart

title
Chart title. Appears at top left of chart.
Options:
string
subtitle
Chart subtitle. Appears just under title.
Options:
string
legend
Turn legend on or off. Legend appears at top center of chart.
Options:
Default:
true for multiple series
chartAreaHeight
Minimum height of the chart area (excl. header and footer) in pixels. Adjusting the height affects all viewport sizes and may impact the mobile UX.
Options:
number
Default:
180
renderer
Which chart renderer type (canvas or SVG) to use. See ECharts' documentation on renderers.
Options:
Default:
canvas

Custom Echarts Options

echartsOptions
Custom Echarts options to override the default options. See reference page for available options.
Options:
{{exampleOption:'exampleValue'}}
seriesOptions
Custom Echarts options to override the default options for all series in the chart. This loops through the series to apply the settings rather than having to specify every series manually using `echartsOptions` See reference page for available options.
Options:
{{exampleSeriesOption:'exampleValue'}}
printEchartsConfig
Helper prop for custom chart development - inserts a code block with the current echarts config onto the page so you can see the options used and debug your custom options
Options:
Default:
false

Interactivity

connectGroup
Group name to connect this chart to other charts for synchronized tooltip hovering. Charts with the same `connectGroup` name will become connected

Annotations

Line charts can include annotations using the ReferenceLine and ReferenceArea components. These components are used within a chart component like so:

	

		
		

<LineChart data="{sales_data}" x="date" y="sales">
	<ReferenceLine data="{target_data}" y="target" label="name" />
	<ReferenceArea xMin="2020-03-14" xMax="2020-05-01" />
</LineChart>