A boolean flag indicating ifARIA attributes should be included (SVG output only). Iffalse, the “aria-hidden” attribute will be set on the output SVG group, removing the axis from the ARIA accessibility tree.

Default value:true

An interpolation fraction indicating where, forband scales, axis ticks should be positioned. A value of0 places ticks at the left edge of their bands. A value of0.5 places ticks in the middle of their bands.

Default value:0.5

A text description of this axis forARIA accessibility (SVG output only). If thearia property is true, for SVG output the“aria-label” attribute will be set to this description. If the description is unspecified it will be automatically generated.

The maximum extent in pixels that axis ticks and labels should use. This determines a maximum offset value for axis titles.

Default value:undefined.

The minimum extent in pixels that axis ticks and labels should use. This determines a minimum offset value for axis titles.

Default value:30 for y-axis;undefined for x-axis.

The orientation of the axis. One of"top","bottom","left" or"right". The orientation can be used to further specialize the axis type (e.g., a y-axis oriented towards the right edge of the chart).

Default value:"bottom" for x-axes and"left" for y-axes.

The offset, in pixels, by which to displace the axis from the edge of the enclosing group or data rectangle.

Default value: derived from theaxis config’soffset (0 by default)

The anchor position of the axis in pixels. For x-axes with top or bottom orientation, this sets the axis group x coordinate. For y-axes with left or right orientation, this sets the axis group y coordinate.

Default value:0

A string or array of strings indicating the name of custom styles to apply to the axis. A style is a named collection of axis property defined within thestyle configuration. If style is an array, later styles will override earlier styles.

Default value: (none)Note: Any specified style will augment the default style. For example, an x-axis mark with"style": "foo" will useconfig.axisX andconfig.style.foo (the specified style"foo" has higher precedence).

Coordinate space translation offset for axis layout. By default, axes are translated by a 0.5 pixel offset for both the x and y coordinates in order to align stroked lines with the pixel grid. However, for vector graphics output these pixel-specific adjustments may be undesirable, in which case translate can be changed (for example, to zero).

Default value:0.5

A non-negative integer indicating the z-index of the axis. If zindex is 0, axes should be drawn behind all chart elements. To put them in front, setzindex to1 or more.

Default value:0 (behind the marks).

A boolean flag indicating if the domain (the axis baseline) should be included as part of the axis.

Default value:true

The stroke cap for the domain line’s ending style. One of"butt","round" or"square".

Default value:"butt"

Color of axis domain line.

Default value:"gray".

Opacity of the axis domain line.

Stroke width of axis domain line

Default value:1

An array of alternating [stroke, space] lengths for dashed domain lines.

The pixel offset at which to start drawing with the domain dash array.

The text format specifier for formatting number and date/time in labels of guides (axes, legends, headers) and text marks.

If the format type is"number" (e.g., for quantitative fields), this is a D3’snumber format pattern string.

If the format type is"time" (e.g., for temporal fields), this is either: a) D3’stime format pattern if you desire to set a static time format.

b)dynamic time format specifier object if you desire to set a dynamic time format that uses different formats depending on the granularity of the input date (e.g., if the date lies on a year, month, date, hour, etc. boundary).

When used with acustomformatType, this value will be passed asformat alongsidedatum.value to the registered function.

Default value: Derived fromnumberFormat config for number format and fromtimeFormat config for time format.

The format type for labels. One of"number","time", or aregistered custom format type.

Default value:

• "time" for temporal fields and ordinal and nominal fields withtimeUnit.
• "number" for quantitative fields as well as ordinal and nominal fields withouttimeUnit.

A boolean flag indicating if labels should be included as part of the axis.

Default value:true.

Horizontal text alignment of axis tick labels, overriding the default setting for the current axis orientation.

The rotation angle of the axis labels.

Default value:-90 for nominal and ordinal fields;0 otherwise.

Vertical text baseline of axis tick labels, overriding the default setting for the current axis orientation. One of"alphabetic" (default),"top","middle","bottom","line-top", or"line-bottom". The"line-top" and"line-bottom" values operate similarly to"top" and"bottom", but are calculated relative to thelineHeight rather thanfontSize alone.

Indicates if labels should be hidden if they exceed the axis range. Iffalse (the default) no bounds overlap analysis is performed. Iftrue, labels will be hidden if they exceed the axis range by more than 1 pixel. If this property is a number, it specifies the pixel tolerance: the maximum amount by which a label bounding box may exceed the axis range.

Default value:false.

The color of the tick label, can be in hex color code or regular color name.

Vega expression for customizing labels.

Note: The label text and value can be assessed via thelabel andvalue properties of the axis’s backingdatum object.

Indicates if the first and last axis labels should be aligned flush with the scale range. Flush alignment for a horizontal axis will left-align the first label and right-align the last label. For vertical axes, bottom and top text baselines are applied instead. If this property is a number, it also indicates the number of pixels by which to offset the first and last labels; for example, a value of 2 will flush-align the first and last labels and also push them 2 pixels outward from the center of the axis. The additional adjustment can sometimes help the labels better visually group with corresponding axis ticks.

Default value:true for axis of a continuous x-scale. Otherwise,false.

Indicates the number of pixels by which to offset flush-adjusted labels. For example, a value of2 will push flush-adjusted labels 2 pixels outward from the center of the axis. Offsets can help the labels better visually group with corresponding axis ticks.

Default value:0.

The font of the tick label.

The font size of the label, in pixels.

Font style of the title.

Font weight of axis tick labels.

Maximum allowed pixel width of axis tick labels.

Default value:180

Line height in pixels for multi-line label text or label text with"line-top" or"line-bottom" baseline.

Position offset in pixels to apply to labels, in addition to tickOffset.

Default value:0

The opacity of the labels.

The strategy to use for resolving overlap of axis labels. Iffalse (the default), no overlap reduction is attempted. If set totrue or"parity", a strategy of removing every other label is used (this works well for standard linear axes). If set to"greedy", a linear scan of the labels is performed, removing any labels that overlaps with the last visible label (this often works better for log-scaled axes).

Default value:true for non-nominal fields with non-log scales;"greedy" for log scales; otherwisefalse.

The padding in pixels between labels and ticks.

Default value:2

The minimum separation that must be between label bounding boxes for them to be considered non-overlapping (default0). This property is ignored iflabelOverlap resolution is not enabled.

Boolean value that determines whether the axis should include ticks.

Default value:true

For band scales, indicates if ticks and grid lines should be placed at the"center" of a band (default) or at the band"extent"s to indicate intervals

The stroke cap for the tick lines’ ending style. One of"butt","round" or"square".

Default value:"butt"

The color of the axis’s tick.

Default value:"gray"

A desired number of ticks, for axes visualizing quantitative scales. The resulting number may be different so that values are “nice” (multiples of 2, 5, 10) and lie within the underlying scale’s range.

For scales of type"time" or"utc", the tick count can instead be a time interval specifier. Legal string values are"millisecond","second","minute","hour","day","week","month", and"year". Alternatively, an object-valued interval specifier of the form{"interval": "month", "step": 3} includes a desired number of interval steps. Here, ticks are generated for each quarter (Jan, Apr, Jul, Oct) boundary.

Default value: Determine using a formulaceil(width/40) for x andceil(height/40) for y.

An array of alternating [stroke, space] lengths for dashed tick mark lines.

Boolean flag indicating if an extra axis tick should be added for the initial position of the axis. This flag is useful for styling axes forband scales such that ticks are placed on band boundaries rather in the middle of a band. Use in conjunction with"bandPosition": 1 and an axis"padding" value of0.

The minimum desired step between axis ticks, in terms of scale domain values. For example, a value of1 indicates that ticks should not be less than 1 unit apart. IftickMinStep is specified, thetickCount value will be adjusted, if necessary, to enforce the minimum step value.

Position offset in pixels to apply to ticks, labels, and gridlines.

Opacity of the ticks.

Boolean flag indicating if pixel position values should be rounded to the nearest integer.

Default value:true

The size in pixels of axis ticks.

Default value:5

The width, in pixels, of ticks.

Default value:1

Explicitly set the visible axis tick values.

A title for the field. Ifnull, the title will be removed.

Default value: derived from the field’s name and transformation function (aggregate,bin andtimeUnit). If the field has an aggregate function, the function is displayed as part of the title (e.g.,"Sum of Profit"). If the field is binned or has a time unit applied, the applied function is shown in parentheses (e.g.,"Profit (binned)","Transaction Date (year-month)"). Otherwise, the title is simply the field name.

Notes:

1) You can customize the default field title format by providing thefieldTitle property in theconfig orfieldTitle function via thecompile function’s options.

2) If both field definition’stitle and axis, header, or legendtitle are defined, axis/header/legend title will be used.

Horizontal text alignment of axis titles.

Text anchor position for placing axis titles.

Angle in degrees of axis titles.

Vertical text baseline for axis titles. One of"alphabetic" (default),"top","middle","bottom","line-top", or"line-bottom". The"line-top" and"line-bottom" values operate similarly to"top" and"bottom", but are calculated relative to thelineHeight rather thanfontSize alone.

Color of the title, can be in hex color code or regular color name.

Font of the title. (e.g.,"Helvetica Neue").

Font size of the title.

Font style of the title.

Font weight of the title. This can be either a string (e.g"bold","normal") or a number (100,200,300, …,900 where"normal" =400 and"bold" =700).

Maximum allowed pixel width of axis titles.

Line height in pixels for multi-line title text or title text with"line-top" or"line-bottom" baseline.

Opacity of the axis title.

The padding, in pixels, between title and axis.

X-coordinate of the axis title relative to the axis group.

Y-coordinate of the axis title relative to the axis group.

A boolean flag indicating if grid lines should be included as part of the axis

Default value:true forcontinuous scales that are not binned; otherwise,false.

The stroke cap for grid lines’ ending style. One of"butt","round" or"square".

Default value:"butt"

Color of gridlines.

Default value:"lightGray".

An array of alternating [stroke, space] lengths for dashed grid lines.

The stroke opacity of grid (value between [0,1])

Default value:1

The grid width, in pixels.

Default value:1

Disable axis by default.