## JavaScript Figure Reference: layout.yaxis

• yaxis
Parent: layout
Type: object containing one or more of the keys listed below.
• anchor
Parent: layout.yaxis
Type: enumerated , one of ( "free" | "/^x([2-9]|[1-9][0-9]+)?( domain)?$/" | "/^y([2-9]|[1-9][0-9]+)?( domain)?$/" )

If set to an opposite-letter axis id (e.g. x2, y), this axis is bound to the corresponding opposite-letter axis. If set to "free", this axis' position is determined by position.

• automargin
Parent: layout.yaxis
Type: flaglist string. Any combination of "height", "width", "left", "right", "top", "bottom" joined with a "+" OR true or false.
Examples: "height", "width", "height+width", "height+width+left", "true"

Determines whether long tick labels automatically grow the figure margins.

• autorange
Parent: layout.yaxis
Type: enumerated , one of ( true | false | "reversed" )
Default: true

Determines whether or not the range of this axis is computed in relation to the input data. See rangemode for more info. If range is provided, then autorange is set to "false".

• autoshift
Parent: layout.yaxis
Type: boolean

Automatically reposition the axis to avoid overlap with other axes with the same overlaying value. This repositioning will account for any shift amount applied to other axes on the same side with autoshift is set to true. Only has an effect if anchor is set to "free".

• autotypenumbers
Parent: layout.yaxis
Type: enumerated , one of ( "convert types" | "strict" )
Default: "convert types"

Using "strict" a numeric string in trace data is not converted to a number. Using "convert types" a numeric string in trace data may be treated as a number during automatic axis type detection. Defaults to layout.autotypenumbers.

• calendar
Parent: layout.yaxis
Type: enumerated , one of ( "chinese" | "coptic" | "discworld" | "ethiopian" | "gregorian" | "hebrew" | "islamic" | "jalali" | "julian" | "mayan" | "nanakshahi" | "nepali" | "persian" | "taiwan" | "thai" | "ummalqura" )
Default: "gregorian"

Sets the calendar system to use for range and tick0 if this is a date axis. This does not set the calendar for interpreting data on this axis, that's specified in the trace or via the global layout.calendar

• categoryarray
Parent: layout.yaxis
Type: data array

Sets the order in which categories on this axis appear. Only has an effect if categoryorder is set to "array". Used with categoryorder.

• categoryorder
Parent: layout.yaxis
Type: enumerated , one of ( "trace" | "category ascending" | "category descending" | "array" | "total ascending" | "total descending" | "min ascending" | "min descending" | "max ascending" | "max descending" | "sum ascending" | "sum descending" | "mean ascending" | "mean descending" | "median ascending" | "median descending" )
Default: "trace"

Specifies the ordering logic for the case of categorical variables. By default, plotly uses "trace", which specifies the order that is present in the data supplied. Set categoryorder to "category ascending" or "category descending" if order should be determined by the alphanumerical order of the category names. Set categoryorder to "array" to derive the ordering from the attribute categoryarray. If a category is not found in the categoryarray array, the sorting behavior for that attribute will be identical to the "trace" mode. The unspecified categories will follow the categories in categoryarray. Set categoryorder to "total ascending" or "total descending" if order should be determined by the numerical order of the values. Similarly, the order can be determined by the min, max, sum, mean or median of all the values.

• color
Parent: layout.yaxis
Type: color
Default: "#444"

Sets default for all colors associated with this axis all at once: line, font, tick, and grid colors. Grid color is lightened by blending this with the plot background Individual pieces can override this.

• constrain
Parent: layout.yaxis
Type: enumerated , one of ( "range" | "domain" )

If this axis needs to be compressed (either due to its own scaleanchor and scaleratio or those of the other axis), determines how that happens: by increasing the "range", or by decreasing the "domain". Default is "domain" for axes containing image traces, "range" otherwise.

• constraintoward
Parent: layout.yaxis
Type: enumerated , one of ( "left" | "center" | "right" | "top" | "middle" | "bottom" )

If this axis needs to be compressed (either due to its own scaleanchor and scaleratio or those of the other axis), determines which direction we push the originally specified plot area. Options are "left", "center" (default), and "right" for x axes, and "top", "middle" (default), and "bottom" for y axes.

• dividercolor
Parent: layout.yaxis
Type: color
Default: "#444"

Sets the color of the dividers Only has an effect on "multicategory" axes.

• dividerwidth
Parent: layout.yaxis
Type: number
Default: 1

Sets the width (in px) of the dividers Only has an effect on "multicategory" axes.

• domain
Parent: layout.yaxis
Type: array
Default: [0, 1]

Sets the domain of this axis (in plot fraction).

• dtick
Parent: layout.yaxis
Type: number or categorical coordinate string

Sets the step in-between ticks on this axis. Use with tick0. Must be a positive number, or special strings available to "log" and "date" axes. If the axis type is "log", then ticks are set every 10^(n"dtick) where n is the tick number. For example, to set a tick mark at 1, 10, 100, 1000, ... set dtick to 1. To set tick marks at 1, 100, 10000, ... set dtick to 2. To set tick marks at 1, 5, 25, 125, 625, 3125, ... set dtick to log_10(5), or 0.69897000433. "log" has several special values; "L<f>", where f is a positive number, gives ticks linearly spaced in value (but not position). For example tick0 = 0.1, dtick = "L0.5" will put ticks at 0.1, 0.6, 1.1, 1.6 etc. To show powers of 10 plus small digits between, use "D1" (all digits) or "D2" (only 2 and 5). tick0 is ignored for "D1" and "D2". If the axis type is "date", then you must convert the time to milliseconds. For example, to set the interval between ticks to one day, set dtick to 86400000.0. "date" also has special values "M<n>" gives ticks spaced by a number of months. n must be a positive integer. To set ticks on the 15th of every third month, set tick0 to "2000-01-15" and dtick to "M3". To set ticks every 4 years, set dtick to "M48"

• exponentformat
Parent: layout.yaxis
Type: enumerated , one of ( "none" | "e" | "E" | "power" | "SI" | "B" )
Default: "B"

Determines a formatting rule for the tick exponents. For example, consider the number 1,000,000,000. If "none", it appears as 1,000,000,000. If "e", 1e+9. If "E", 1E+9. If "power", 1x10^9 (with 9 in a super script). If "SI", 1G. If "B", 1B.

• fixedrange
Parent: layout.yaxis
Type: boolean

Determines whether or not this axis is zoom-able. If true, then zoom is disabled.

• gridcolor
Parent: layout.yaxis
Type: color
Default: "#eee"

Sets the color of the grid lines.

• griddash
Parent: layout.yaxis
Type: string
Default: "solid"

Sets the dash style of lines. Set to a dash type string ("solid", "dot", "dash", "longdash", "dashdot", or "longdashdot") or a dash length list in px (eg "5px,10px,2px,2px").

• gridwidth
Parent: layout.yaxis
Type: number greater than or equal to 0
Default: 1

Sets the width (in px) of the grid lines.

• hoverformat
Parent: layout.yaxis
Type: string
Default: ""

Sets the hover text formatting rule using d3 formatting mini-languages which are very similar to those in Python. For numbers, see: https://github.com/d3/d3-format/tree/v1.4.5#d3-format. And for dates see: https://github.com/d3/d3-time-format/tree/v2.2.3#locale_format. We add two items to d3's date formatter: "%h" for half of the year as a decimal number as well as "%{n}f" for fractional seconds with n digits. For example, "2016-10-13 09:15:23.456" with tickformat "%H~%M~%S.%2f" would display "09~15~23.46"

• labelalias
Parent: layout.yaxis
Type: number or categorical coordinate string

Replacement text for specific tick or hover labels. For example using {US: 'USA', CA: 'Canada'} changes US to USA and CA to Canada. The labels we would have shown must match the keys exactly, after adding any tickprefix or ticksuffix. labelalias can be used with any axis type, and both keys (if needed) and values (if desired) can include html-like tags or MathJax.

• layer
Parent: layout.yaxis
Type: enumerated , one of ( "above traces" | "below traces" )
Default: "above traces"

Sets the layer on which this axis is displayed. If "above traces", this axis is displayed above all the subplot's traces If "below traces", this axis is displayed below all the subplot's traces, but above the grid lines. Useful when used together with scatter-like traces with cliponaxis set to "false" to show markers and/or text nodes above this axis.

• linecolor
Parent: layout.yaxis
Type: color
Default: "#444"

Sets the axis line color.

• linewidth
Parent: layout.yaxis
Type: number greater than or equal to 0
Default: 1

Sets the width (in px) of the axis line.

• matches
Parent: layout.yaxis
Type: enumerated , one of ( "/^x([2-9]|[1-9][0-9]+)?( domain)?$/" | "/^y([2-9]|[1-9][0-9]+)?( domain)?$/" )

If set to another axis id (e.g. x2, y), the range of this axis will match the range of the corresponding axis in data-coordinates space. Moreover, matching axes share auto-range values, category lists and histogram auto-bins. Note that setting axes simultaneously in both a scaleanchor and a matches constraint is currently forbidden. Moreover, note that matching axes must have the same type.

• minexponent
Parent: layout.yaxis
Type: number greater than or equal to 0
Default: 3

Hide SI prefix for 10^n if |n| is below this number. This only has an effect when tickformat is "SI" or "B".

• minor
Parent: layout.yaxis
Type: object containing one or more of the keys listed below.
• dtick
Parent: layout.yaxis.minor
Type: number or categorical coordinate string

Sets the step in-between ticks on this axis. Use with tick0. Must be a positive number, or special strings available to "log" and "date" axes. If the axis type is "log", then ticks are set every 10^(n"dtick) where n is the tick number. For example, to set a tick mark at 1, 10, 100, 1000, ... set dtick to 1. To set tick marks at 1, 100, 10000, ... set dtick to 2. To set tick marks at 1, 5, 25, 125, 625, 3125, ... set dtick to log_10(5), or 0.69897000433. "log" has several special values; "L<f>", where f is a positive number, gives ticks linearly spaced in value (but not position). For example tick0 = 0.1, dtick = "L0.5" will put ticks at 0.1, 0.6, 1.1, 1.6 etc. To show powers of 10 plus small digits between, use "D1" (all digits) or "D2" (only 2 and 5). tick0 is ignored for "D1" and "D2". If the axis type is "date", then you must convert the time to milliseconds. For example, to set the interval between ticks to one day, set dtick to 86400000.0. "date" also has special values "M<n>" gives ticks spaced by a number of months. n must be a positive integer. To set ticks on the 15th of every third month, set tick0 to "2000-01-15" and dtick to "M3". To set ticks every 4 years, set dtick to "M48"

• gridcolor
Parent: layout.yaxis.minor
Type: color
Default: "#eee"

Sets the color of the grid lines.

• griddash
Parent: layout.yaxis.minor
Type: string
Default: "solid"

Sets the dash style of lines. Set to a dash type string ("solid", "dot", "dash", "longdash", "dashdot", or "longdashdot") or a dash length list in px (eg "5px,10px,2px,2px").

• gridwidth
Parent: layout.yaxis.minor
Type: number greater than or equal to 0

Sets the width (in px) of the grid lines.

• nticks
Parent: layout.yaxis.minor
Type: integer greater than or equal to 0
Default: 5

Specifies the maximum number of ticks for the particular axis. The actual number of ticks will be chosen automatically to be less than or equal to nticks. Has an effect only if tickmode is set to "auto".

• showgrid
Parent: layout.yaxis.minor
Type: boolean

Determines whether or not grid lines are drawn. If "true", the grid lines are drawn at every tick mark.

• tick0
Parent: layout.yaxis.minor
Type: number or categorical coordinate string

Sets the placement of the first tick on this axis. Use with dtick. If the axis type is "log", then you must take the log of your starting tick (e.g. to set the starting tick to 100, set the tick0 to 2) except when dtick="L<f>" (see dtick for more info). If the axis type is "date", it should be a date string, like date data. If the axis type is "category", it should be a number, using the scale where each category is assigned a serial number from zero in the order it appears.

• tickcolor
Parent: layout.yaxis.minor
Type: color
Default: "#444"

Sets the tick color.

• ticklen
Parent: layout.yaxis.minor
Type: number greater than or equal to 0

Sets the tick length (in px).

• tickmode
Parent: layout.yaxis.minor
Type: enumerated , one of ( "auto" | "linear" | "array" )

Sets the tick mode for this axis. If "auto", the number of ticks is set via nticks. If "linear", the placement of the ticks is determined by a starting position tick0 and a tick step dtick ("linear" is the default value if tick0 and dtick are provided). If "array", the placement of the ticks is set via tickvals and the tick text is ticktext. ("array" is the default value if tickvals is provided).

• ticks
Parent: layout.yaxis.minor
Type: enumerated , one of ( "outside" | "inside" | "" )

Determines whether ticks are drawn or not. If "", this axis' ticks are not drawn. If "outside" ("inside"), this axis' are drawn outside (inside) the axis lines.

• tickvals
Parent: layout.yaxis.minor
Type: data array

Sets the values at which ticks on this axis appear. Only has an effect if tickmode is set to "array". Used with ticktext.

• tickwidth
Parent: layout.yaxis.minor
Type: number greater than or equal to 0

Sets the tick width (in px).

• mirror
Parent: layout.yaxis
Type: enumerated , one of ( true | "ticks" | false | "all" | "allticks" )

Determines if the axis lines or/and ticks are mirrored to the opposite side of the plotting area. If "true", the axis lines are mirrored. If "ticks", the axis lines and ticks are mirrored. If "false", mirroring is disable. If "all", axis lines are mirrored on all shared-axes subplots. If "allticks", axis lines and ticks are mirrored on all shared-axes subplots.

• nticks
Parent: layout.yaxis
Type: integer greater than or equal to 0
Default: 0

Specifies the maximum number of ticks for the particular axis. The actual number of ticks will be chosen automatically to be less than or equal to nticks. Has an effect only if tickmode is set to "auto".

• overlaying
Parent: layout.yaxis
Type: enumerated , one of ( "free" | "/^x([2-9]|[1-9][0-9]+)?( domain)?$/" | "/^y([2-9]|[1-9][0-9]+)?( domain)?$/" )

If set a same-letter axis id, this axis is overlaid on top of the corresponding same-letter axis, with traces and axes visible for both axes. If "false", this axis does not overlay any same-letter axes. In this case, for axes with overlapping domains only the highest-numbered axis will be visible.

• position
Parent: layout.yaxis
Type: number between or equal to 0 and 1
Default: 0

Sets the position of this axis in the plotting space (in normalized coordinates). Only has an effect if anchor is set to "free".

• range
Parent: layout.yaxis
Type: array

Sets the range of this axis. If the axis type is "log", then you must take the log of your desired range (e.g. to set the range from 1 to 100, set the range from 0 to 2). If the axis type is "date", it should be date strings, like date data, though Date objects and unix milliseconds will be accepted and converted to strings. If the axis type is "category", it should be numbers, using the scale where each category is assigned a serial number from zero in the order it appears.

• rangebreaks
Parent: layout.yaxis
Type: array of object where each object has one or more of the keys listed below.
• bounds
Parent: layout.yaxis.rangebreaks[]
Type: array

Sets the lower and upper bounds of this axis rangebreak. Can be used with pattern.

• dvalue
Parent: layout.yaxis.rangebreaks[]
Type: number greater than or equal to 0
Default: 86400000

Sets the size of each values item. The default is one day in milliseconds.

• enabled
Parent: layout.yaxis.rangebreaks[]
Type: boolean
Default: true

Determines whether this axis rangebreak is enabled or disabled. Please note that rangebreaks only work for "date" axis type.

• name
Parent: layout.yaxis.rangebreaks[]
Type: string

When used in a template, named items are created in the output figure in addition to any items the figure already has in this array. You can modify these items in the output figure by making your own item with templateitemname matching this name alongside your modifications (including visible: false or enabled: false to hide it). Has no effect outside of a template.

• pattern
Parent: layout.yaxis.rangebreaks[]
Type: enumerated , one of ( "day of week" | "hour" | "" )

Determines a pattern on the time line that generates breaks. If "day of week" - days of the week in English e.g. 'Sunday' or sun (matching is case-insensitive and considers only the first three characters), as well as Sunday-based integers between 0 and 6. If "hour" - hour (24-hour clock) as decimal numbers between 0 and 24. for more info. Examples: - { pattern: 'day of week', bounds: [6, 1] } or simply { bounds: ['sat', 'mon'] } breaks from Saturday to Monday (i.e. skips the weekends). - { pattern: 'hour', bounds: [17, 8] } breaks from 5pm to 8am (i.e. skips non-work hours).

• templateitemname
Parent: layout.yaxis.rangebreaks[]
Type: string

Used to refer to a named item in this array in the template. Named items from the template will be created even without a matching item in the input figure, but you can modify one by making an item with templateitemname matching its name, alongside your modifications (including visible: false or enabled: false to hide it). If there is no template or no matching item, this item will be hidden unless you explicitly show it with visible: true.

• values
Parent: layout.yaxis.rangebreaks[]
Type: array

Sets the coordinate values corresponding to the rangebreaks. An alternative to bounds. Use dvalue to set the size of the values along the axis.

• rangemode
Parent: layout.yaxis
Type: enumerated , one of ( "normal" | "tozero" | "nonnegative" )
Default: "normal"

If "normal", the range is computed in relation to the extrema of the input data. If "tozero", the range extends to 0, regardless of the input data If "nonnegative", the range is non-negative, regardless of the input data. Applies only to linear axes.

• scaleanchor
Parent: layout.yaxis
Type: enumerated , one of ( "/^x([2-9]|[1-9][0-9]+)?( domain)?$/" | "/^y([2-9]|[1-9][0-9]+)?( domain)?$/" )

If set to another axis id (e.g. x2, y), the range of this axis changes together with the range of the corresponding axis such that the scale of pixels per unit is in a constant ratio. Both axes are still zoomable, but when you zoom one, the other will zoom the same amount, keeping a fixed midpoint. constrain and constraintoward determine how we enforce the constraint. You can chain these, ie yaxis: {scaleanchor: "x"}, xaxis2: {scaleanchor: "y"} but you can only link axes of the same type. The linked axis can have the opposite letter (to constrain the aspect ratio) or the same letter (to match scales across subplots). Loops (yaxis: {scaleanchor: "x"}, xaxis: {scaleanchor: "y"} or longer) are redundant and the last constraint encountered will be ignored to avoid possible inconsistent constraints via scaleratio. Note that setting axes simultaneously in both a scaleanchor and a matches constraint is currently forbidden.

• scaleratio
Parent: layout.yaxis
Type: number greater than or equal to 0
Default: 1

If this axis is linked to another by scaleanchor, this determines the pixel to unit scale ratio. For example, if this value is 10, then every unit on this axis spans 10 times the number of pixels as a unit on the linked axis. Use this for example to create an elevation profile where the vertical scale is exaggerated a fixed amount with respect to the horizontal.

• separatethousands
Parent: layout.yaxis
Type: boolean

If "true", even 4-digit integers are separated

• shift
Parent: layout.yaxis
Type: number

Moves the axis a given number of pixels from where it would have been otherwise. Accepts both positive and negative values, which will shift the axis either right or left, respectively. If autoshift is set to true, then this defaults to a padding of -3 if side is set to "left". and defaults to +3 if side is set to "right". Defaults to 0 if autoshift is set to false. Only has an effect if anchor is set to "free".

• showdividers
Parent: layout.yaxis
Type: boolean
Default: true

Determines whether or not a dividers are drawn between the category levels of this axis. Only has an effect on "multicategory" axes.

• showexponent
Parent: layout.yaxis
Type: enumerated , one of ( "all" | "first" | "last" | "none" )
Default: "all"

If "all", all exponents are shown besides their significands. If "first", only the exponent of the first tick is shown. If "last", only the exponent of the last tick is shown. If "none", no exponents appear.

• showgrid
Parent: layout.yaxis
Type: boolean

Determines whether or not grid lines are drawn. If "true", the grid lines are drawn at every tick mark.

• showline
Parent: layout.yaxis
Type: boolean

Determines whether or not a line bounding this axis is drawn.

• showspikes
Parent: layout.yaxis
Type: boolean

Determines whether or not spikes (aka droplines) are drawn for this axis. Note: This only takes affect when hovermode = closest

• showticklabels
Parent: layout.yaxis
Type: boolean
Default: true

Determines whether or not the tick labels are drawn.

• showtickprefix
Parent: layout.yaxis
Type: enumerated , one of ( "all" | "first" | "last" | "none" )
Default: "all"

If "all", all tick labels are displayed with a prefix. If "first", only the first tick is displayed with a prefix. If "last", only the last tick is displayed with a suffix. If "none", tick prefixes are hidden.

• showticksuffix
Parent: layout.yaxis
Type: enumerated , one of ( "all" | "first" | "last" | "none" )
Default: "all"

Same as showtickprefix but for tick suffixes.

• side
Parent: layout.yaxis
Type: enumerated , one of ( "top" | "bottom" | "left" | "right" )

Determines whether a x (y) axis is positioned at the "bottom" ("left") or "top" ("right") of the plotting area.

• spikecolor
Parent: layout.yaxis
Type: color

Sets the spike color. If undefined, will use the series color

• spikedash
Parent: layout.yaxis
Type: string
Default: "dash"

Sets the dash style of lines. Set to a dash type string ("solid", "dot", "dash", "longdash", "dashdot", or "longdashdot") or a dash length list in px (eg "5px,10px,2px,2px").

• spikemode
Parent: layout.yaxis
Type: flaglist string. Any combination of "toaxis", "across", "marker" joined with a "+"
Examples: "toaxis", "across", "toaxis+across", "toaxis+across+marker"
Default: "toaxis"

Determines the drawing mode for the spike line If "toaxis", the line is drawn from the data point to the axis the series is plotted on. If "across", the line is drawn across the entire plot area, and supercedes "toaxis". If "marker", then a marker dot is drawn on the axis the series is plotted on

• spikesnap
Parent: layout.yaxis
Type: enumerated , one of ( "data" | "cursor" | "hovered data" )
Default: "hovered data"

Determines whether spikelines are stuck to the cursor or to the closest datapoints.

• spikethickness
Parent: layout.yaxis
Type: number
Default: 3

Sets the width (in px) of the zero line.

• tick0
Parent: layout.yaxis
Type: number or categorical coordinate string

Sets the placement of the first tick on this axis. Use with dtick. If the axis type is "log", then you must take the log of your starting tick (e.g. to set the starting tick to 100, set the tick0 to 2) except when dtick="L<f>" (see dtick for more info). If the axis type is "date", it should be a date string, like date data. If the axis type is "category", it should be a number, using the scale where each category is assigned a serial number from zero in the order it appears.

• tickangle
Parent: layout.yaxis
Type: angle
Default: "auto"

Sets the angle of the tick labels with respect to the horizontal. For example, a tickangle of -90 draws the tick labels vertically.

• tickcolor
Parent: layout.yaxis
Type: color
Default: "#444"

Sets the tick color.

• tickfont
Parent: layout.yaxis
Type: object containing one or more of the keys listed below.

Sets the tick font.

• color
Parent: layout.yaxis.tickfont
Type: color
• family
Parent: layout.yaxis.tickfont
Type: string

HTML font family - the typeface that will be applied by the web browser. The web browser will only be able to apply a font if it is available on the system which it operates. Provide multiple font families, separated by commas, to indicate the preference in which to apply fonts if they aren't available on the system. The Chart Studio Cloud (at https://chart-studio.plotly.com or on-premise) generates images on a server, where only a select number of fonts are installed and supported. These include "Arial", "Balto", "Courier New", "Droid Sans",, "Droid Serif", "Droid Sans Mono", "Gravitas One", "Old Standard TT", "Open Sans", "Overpass", "PT Sans Narrow", "Raleway", "Times New Roman".

• size
Parent: layout.yaxis.tickfont
Type: number greater than or equal to 1
• tickformat
Parent: layout.yaxis
Type: string
Default: ""

Sets the tick label formatting rule using d3 formatting mini-languages which are very similar to those in Python. For numbers, see: https://github.com/d3/d3-format/tree/v1.4.5#d3-format. And for dates see: https://github.com/d3/d3-time-format/tree/v2.2.3#locale_format. We add two items to d3's date formatter: "%h" for half of the year as a decimal number as well as "%{n}f" for fractional seconds with n digits. For example, "2016-10-13 09:15:23.456" with tickformat "%H~%M~%S.%2f" would display "09~15~23.46"

• tickformatstops
Parent: layout.yaxis
Type: array of object where each object has one or more of the keys listed below.
• dtickrange
Parent: layout.yaxis.tickformatstops[]
Type: array

range ["min", "max"], where "min", "max" - dtick values which describe some zoom level, it is possible to omit "min" or "max" value by passing "null"

• enabled
Parent: layout.yaxis.tickformatstops[]
Type: boolean
Default: true

Determines whether or not this stop is used. If false, this stop is ignored even within its dtickrange.

• name
Parent: layout.yaxis.tickformatstops[]
Type: string

When used in a template, named items are created in the output figure in addition to any items the figure already has in this array. You can modify these items in the output figure by making your own item with templateitemname matching this name alongside your modifications (including visible: false or enabled: false to hide it). Has no effect outside of a template.

• templateitemname
Parent: layout.yaxis.tickformatstops[]
Type: string

Used to refer to a named item in this array in the template. Named items from the template will be created even without a matching item in the input figure, but you can modify one by making an item with templateitemname matching its name, alongside your modifications (including visible: false or enabled: false to hide it). If there is no template or no matching item, this item will be hidden unless you explicitly show it with visible: true.

• value
Parent: layout.yaxis.tickformatstops[]
Type: string
Default: ""

string - dtickformat for described zoom level, the same as "tickformat"

• ticklabelmode
Parent: layout.yaxis
Type: enumerated , one of ( "instant" | "period" )
Default: "instant"

Determines where tick labels are drawn with respect to their corresponding ticks and grid lines. Only has an effect for axes of type "date" When set to "period", tick labels are drawn in the middle of the period between ticks.

• ticklabeloverflow
Parent: layout.yaxis
Type: enumerated , one of ( "allow" | "hide past div" | "hide past domain" )

Determines how we handle tick labels that would overflow either the graph div or the domain of the axis. The default value for inside tick labels is "hide past domain". Otherwise on "category" and "multicategory" axes the default is "allow". In other cases the default is "hide past div".

• ticklabelposition
Parent: layout.yaxis
Type: enumerated , one of ( "outside" | "inside" | "outside top" | "inside top" | "outside left" | "inside left" | "outside right" | "inside right" | "outside bottom" | "inside bottom" )
Default: "outside"

Determines where tick labels are drawn with respect to the axis Please note that top or bottom has no effect on x axes or when ticklabelmode is set to "period". Similarly left or right has no effect on y axes or when ticklabelmode is set to "period". Has no effect on "multicategory" axes or when tickson is set to "boundaries". When used on axes linked by matches or scaleanchor, no extra padding for inside labels would be added by autorange, so that the scales could match.

• ticklabelstep
Parent: layout.yaxis
Type: integer greater than or equal to 1
Default: 1

Sets the spacing between tick labels as compared to the spacing between ticks. A value of 1 (default) means each tick gets a label. A value of 2 means shows every 2nd label. A larger value n means only every nth tick is labeled. tick0 determines which labels are shown. Not implemented for axes with type "log" or "multicategory", or when tickmode is "array".

• ticklen
Parent: layout.yaxis
Type: number greater than or equal to 0
Default: 5

Sets the tick length (in px).

• tickmode
Parent: layout.yaxis
Type: enumerated , one of ( "auto" | "linear" | "array" | "sync" )

Sets the tick mode for this axis. If "auto", the number of ticks is set via nticks. If "linear", the placement of the ticks is determined by a starting position tick0 and a tick step dtick ("linear" is the default value if tick0 and dtick are provided). If "array", the placement of the ticks is set via tickvals and the tick text is ticktext. ("array" is the default value if tickvals is provided). If "sync", the number of ticks will sync with the overlayed axis set by overlaying property.

• tickprefix
Parent: layout.yaxis
Type: string
Default: ""

Sets a tick label prefix.

• ticks
Parent: layout.yaxis
Type: enumerated , one of ( "outside" | "inside" | "" )

Determines whether ticks are drawn or not. If "", this axis' ticks are not drawn. If "outside" ("inside"), this axis' are drawn outside (inside) the axis lines.

• tickson
Parent: layout.yaxis
Type: enumerated , one of ( "labels" | "boundaries" )
Default: "labels"

Determines where ticks and grid lines are drawn with respect to their corresponding tick labels. Only has an effect for axes of type "category" or "multicategory". When set to "boundaries", ticks and grid lines are drawn half a category to the left/bottom of labels.

• ticksuffix
Parent: layout.yaxis
Type: string
Default: ""

Sets a tick label suffix.

• ticktext
Parent: layout.yaxis
Type: data array

Sets the text displayed at the ticks position via tickvals. Only has an effect if tickmode is set to "array". Used with tickvals.

• tickvals
Parent: layout.yaxis
Type: data array

Sets the values at which ticks on this axis appear. Only has an effect if tickmode is set to "array". Used with ticktext.

• tickwidth
Parent: layout.yaxis
Type: number greater than or equal to 0
Default: 1

Sets the tick width (in px).

• title
Parent: layout.yaxis
Type: object containing one or more of the keys listed below.
• font
Parent: layout.yaxis.title
Type: object containing one or more of the keys listed below.

Sets this axis' title font. Note that the title's font used to be customized by the now deprecated titlefont attribute.

• color
Parent: layout.yaxis.title.font
Type: color
• family
Parent: layout.yaxis.title.font
Type: string

HTML font family - the typeface that will be applied by the web browser. The web browser will only be able to apply a font if it is available on the system which it operates. Provide multiple font families, separated by commas, to indicate the preference in which to apply fonts if they aren't available on the system. The Chart Studio Cloud (at https://chart-studio.plotly.com or on-premise) generates images on a server, where only a select number of fonts are installed and supported. These include "Arial", "Balto", "Courier New", "Droid Sans",, "Droid Serif", "Droid Sans Mono", "Gravitas One", "Old Standard TT", "Open Sans", "Overpass", "PT Sans Narrow", "Raleway", "Times New Roman".

• size
Parent: layout.yaxis.title.font
Type: number greater than or equal to 1
• standoff
Parent: layout.yaxis.title
Type: number greater than or equal to 0

Sets the standoff distance (in px) between the axis labels and the title text The default value is a function of the axis tick labels, the title font.size and the axis linewidth. Note that the axis title position is always constrained within the margins, so the actual standoff distance is always less than the set or default value. By setting standoff and turning on automargin, plotly.js will push the margins to fit the axis title at given standoff distance.

• text
Parent: layout.yaxis.title
Type: string

Sets the title of this axis. Note that before the existence of title.text, the title's contents used to be defined as the title attribute itself. This behavior has been deprecated.

• type
Parent: layout.yaxis
Type: enumerated , one of ( "-" | "linear" | "log" | "date" | "category" | "multicategory" )
Default: "-"

Sets the axis type. By default, plotly attempts to determined the axis type by looking into the data of the traces that referenced the axis in question.

• uirevision
Parent: layout.yaxis
Type: number or categorical coordinate string

Controls persistence of user-driven changes in axis range, autorange, and title if in editable: true configuration. Defaults to layout.uirevision.

• visible
Parent: layout.yaxis
Type: boolean

A single toggle to hide the axis while preserving interaction like dragging. Default is true when a cheater plot is present on the axis, otherwise false

• zeroline
Parent: layout.yaxis
Type: boolean

Determines whether or not a line is drawn at along the 0 value of this axis. If "true", the zero line is drawn on top of the grid lines.

• zerolinecolor
Parent: layout.yaxis
Type: color
Default: "#444"

Sets the line color of the zero line.

• zerolinewidth
Parent: layout.yaxis
Type: number
Default: 1`

Sets the width (in px) of the zero line.