valueAxis

Specifies value axis options for the dxChart widget.

Type: Object|Array

For charting, the rectangular coordinate system is used to determine each point uniquely on a plane through two numbers, the argument and the value of the point. Two perpendicular lines (the axis of arguments and the axis of values) are specified to define the coordinates. To define the argument axis, use the argumentAxis configuration object. To define the value axis, use the valueAxis configuration object. When series are displayed on several panes, there should be a value axis for each pane defined. In addition, different series can be displayed using different value axes on one pane. In these instances, the valueAxis can be an array of objects representing values axes.

To set the properties of all axes to a common value, use the commonAxisSettings configuration object. It exposes properties that can be specified for all axes simultaneously. Note that the value specified for an axis individually (in the argumentAxis or valueAxis object) overrides the value that specified in the commonAxisSettings object.

View Demo

Show Example:
jQuery

In this example, the value axis' axisDivisionFactor option is set to 15, and the minValueMargin and maxValueMargin options are set to 0.04.


                                    

                                    

axisDivisionFactor

Specifies a coefficient for dividing the value axis.

Type: Number
Default Value: 30

The value axis is divided by default so that the labels corresponding to the ticks/grid lines do not overlap each other. If you need to make the axis tick interval larger or smaller, use the axisDivisionFactor property. This property value is a coefficient used internally to calculate the distance between axis labels. This allows you to set axis division without knowledge of the actual axis values.

NOTE
This option is used for continuous and logarithmic argument axes only.
Show Example:
jQuery

In the example below, the value axis' axisDivisionFactor option is set to 15.


                                    

                                    

categories

Specifies the order in which discrete values are arranged on the value axis.

Type: Array

If you specify the chart's data using a common array of objects, these objects may be displayed in a random order. If you set the Chart's data for each series individually, the order in which the series are positioned in the series array can also be random. In these instances, the resulting value order on the discrete value axis may not be appropriate. To specify the order of categories (values on a discrete value axis), assign an array of category names to the categories property.

Show Example:
jQuery

This example shows how to use the categories option for ordering values. The required order is specified in the array assigned to the value axis' categories option.


                                    

                                    

color

Specifies the color of the line that represents an axis.

Type: String
Default Value: '#d3d3d3'

This option supports the following colors.

  • Hexadecimal colors
  • RGB colors
  • RGBA colors (not supported in Internet Explorer 8)
  • Predefined/cross-browser color names
  • Predefined SVG colors (not supported in Internet Explorer 8)
Show Example:
jQuery

In this example, the value axis is green.


                                    

                                    

constantLines[]

Defines an array of the value axis constant lines.

Type: Array
Cannot be used in themes.

A constant line is a straight line that can be used to display, for example, an asymptote of a graph. To display constant lines on a chart, assign an array of objects specifying the options of each constant line to the constantLines field. It is necessary to set the value option within these objects. The other options can be set if required.

You can customize the appearance of all the value axis constant lines at once. For this purpose, use the valueAxis | constantLineStyle configuration object. Note that the options that are set within the valueAxis | constantLine object override the corresponding options that are set within the valueAxis | constantLineStyle object.

View Demo

Show Example:
jQuery

In the following example, each value axis constant line is drawn in a different color and width.


                                    

                                    

constantLineStyle

Specifies the appearance options for the constant lines of the value axis.

Type: Object

Use this object to set the appearance options for the constant lines of the value axis. For example, you can change the color, dash style and width of the line using corresponding options, or define the look of the labels using the label object.

To specify a style for the constant lines of the argument and value axis together, use the commonAxisSettings | constantLineStyle object.

In addition, you can define the appearance of each constant line individually. For more information, refer to the constantLines object description.

NOTE
The options specified within the valueAxis | constantLines object override the corresponding options specified within the valueAxis | constantLineStyle object. In turn, the options specified within the valueAxis | constantLineStyle object override the options specified within the commonAxisSettings | constantLineStyle object.
Show Example:
jQuery

In the following example, several appearance options of the value axis constant lines are changed. These lines are drawn in the yellowgreen color with a 2-pixel width. The dash style of the lines is changed to longDash. In addition, the constant line labels are colored in lightskyblue.


                                    

                                    

discreteAxisDivisionMode

Specifies whether ticks/grid lines of a discrete axis are located between labels or cross the labels.

Type: String
Default Value: 'betweenLabels'
Accepted Values: 'betweenLabels' | 'crossLabels'

When a discrete axis is divided, its ticks/grid lines are located between labels by default. If this is not appropriate, use the discreteAxisDivisionMode property to set the required mode for positioning ticks and grid lines on a discrete axis.

Show Example:
jQuery

In the following example, you can note the difference between two modes of positioning ticks and grid lines on a discrete axis. Use the drop-down list in the bottom to change the value of the discreteAxisDivisionMode option.


                                    

                                    

grid

An object defining the configuration options for the grid lines of an axis in the dxChart widget.

Type: Object

Grid lines are the reference lines used to improve the readability of a chart's visual data. Grid lines are drawn from axis ticks throughout the entire chart. The grid object exposes the properties that allow you to specify visibility and appearance settings for axis grid lines. To learn more about axis grid lines and their options, refer to the Grid topic.

Show Example:
jQuery

In this example, the value axis gridlines are displayed.


                                    

                                    

inverted

Indicates whether or not an axis is inverted.

Type: Boolean
Default Value: false

When an axis is inverted, the maximum and minimum values are reversed. As a result, the axis values increase in a direction that is opposite to the initial direction. The chart series are also inverted.

Show Example:
jQuery

Use the check box at the bottom to invert the value axis.


                                    

                                    

label

Specifies options for value axis labels.

Type: Object

Axis labels represent textual values for axis ticks, which are not visible by default. To specify custom settings for the value axis labels, use the label configuration object. If you need to set a common value for labels on all axes, use the commonAxisSettings | label configuration object. This object exposes the properties that can be specified for labels on all axes simultaneously. Note that a value specified for the value axis individually (in the valueAxis | label object) overrides the value that is specified in the commonAxisSettings | label object.

Show Example:
jQuery

In this example, additional text is added to the value axis labels using the customizeText option.


                                    

                                    

logarithmBase

Specifies the value to be raised to a power when generating ticks for a logarithmic axis.

Type: Number
Default Value: 10

By default, ticks on a logarithmic axis are generated on a base of 10, i.e., 0.1, 1, 10, 100, 1000, etc. But you can specify a base you require using the logarithmBase option. For example, if you set this option to 5, the following ticks will be generated: 0.5, 5, 25, 125, 625, etc.

NOTE
The value assigned to the logarithmBase option should be greater than 1.
Show Example:
jQuery

Use the set of radio buttons located under the chart to change the value axis' logarithmBase option at runtime.


                                    

                                    

max

Specifies the maximum value on the value axis.

Default Value: undefined

Use the max property to set a custom maximum value for the value axis. You can also set a custom minimum value for the value axis using the min property. If you do not specify these properties, the maximum and minimum values on the value axis correspond to the maximum and minimum values in the chart's data.

If you need to extend the limit values for the value axis, set the valueMarginsEnabled property to true and specify the minValueMargin and maxValueMargin properties (if the axis is continuous). In this instance, the series will be indented from the maximum and minimum axis boundaries.

Show Example:
jQuery

The following example illustrates how to display a portion of the chart using the value axis' min and max options.


                                    

                                    

maxValueMargin

Specifies a coefficient that determines the spacing between the maximum series point and the axis.

Type: Number
Default Value: undefined

When margins are enabled in a chart, an axis extends slightly beyond its min and max values. It is required for preventing the cutting of parts off of the minimum and maximum series points.

By default, margins are calculated automatically and equal to half of an axis' tick interval. If you need to specify custom margins, use the minValueMargin and maxValueMargin options. These options accept coefficients that are used to calculate the actual start and end values for an axis with applied margins. The end value is calculated using the following formula.

endValue = max + (max - min) * maxValueMargin

For example, consider that min is 1960 and max is 2010. If you set the maxValueMargin option to 0.1, the axis will end in 2015.

endValue = 2010 + (2010 - 1960) * 0.1 = 2010 + 50 * 0.1 = 2010 + 5 = 2015

MaxValueMargin ChartJS

To discover how the axis' start value is calculated, refer to the minValueMargin option description.

NOTE
Margins can be added to axes of the continuous or logarithmic type only.

min

Specifies the minimum value on the value axis.

Default Value: undefined

Use the min property to set a custom minimum value for the value axis. You can also set a custom maximum value for the value axis using the max property. If you do not specify these properties, the maximum and minimum values on the value axis correspond to the maximum and minimum values in the chart's data.

If you need to extend the boundary values for the value axis, set the valueMarginsEnabled property to true and specify the minValueMargin and maxValueMargin properties (if the axis is continuous). In this instance, the series will be indented from the maximum and minimum axis boundaries.

Show Example:
jQuery

The following example illustrates how to display a portion of the chart using the value axis' min and max options.


                                    

                                    

minorGrid

Specifies the options of the minor grid.

Type: Object

In addition to the major grid built on major ticks, the dxChart widget provides the minor grid that is built on minor ticks. The lines of the minor grid extend from the minor ticks throughout the entire chart's plot.

NOTE
Neither minor ticks, nor the minor grid can be used if the axis is discrete.

To specify the appearance of grid lines, use the options of the minorGrid object. Declared within the commonAxisSettings object, the minorGrid object changes the appearance of horizontal and vertical lines simultaneously. To change the appearance of horizontal or vertical lines individually, declare the minorGrid object in the argumentAxis or valueAxis object respectively. Settings specified individually override those that are set in the commonAxisSettings object.

To make the minor grid visible, set the visible option of the minorGrid object to true. Additionally, you can change the color, opacity and width of the grid lines using the corresponding options.

NOTE
If you try to display the minor grid without the major grid, the result may be disappointing. Hence, we recommend you use the minor grid only in conjunction with the major grid.

minorTick

Specifies the options of the minor ticks.

Type: Object

In addition to major ticks, the dxChart widget provides the capability to draw minor ticks. Minor ticks divide an axis segment that lies between two neighboring major ticks. To specify how to generate minor ticks, use the minorTickInterval or minorTickCount options.

To configure the appearance of minor ticks, use the options of the minorTick object. Declared within the commonAxisSettings object, the minorTick object sets options for all minor ticks. To change the appearance of the minor ticks that belong to the argument or value axis individually, declare the minorTick object in the argumentAxis or valueAxis object respectively. Settings specified individually override those that are set in the commonAxisSettings object.

By default, minor ticks are hidden. To make them visible, assign true to the visible option of the minorTick object. Additionally, you can change the color, opacity and width of the minor ticks using the corresponding options.

NOTE
Minor ticks cannot be displayed on a discrete axis.

minorTickCount

Specifies the number of minor ticks between two neighboring major ticks.

Type: Number
Default Value: undefined
NOTE
If you set both the minorTickCount and the minorTickInterval options, the minorTickCount option will be ignored.

minorTickInterval

Specifies the interval between minor ticks.

Default Value: undefined
Accepted Values: 'millisecond' | 'second' | 'minute' | 'hour' | 'day' | 'week' | 'month' | 'quarter' | 'year'

To divide a lengthy chart axis into shorter segments, major and minor ticks are used. Major ticks are accompanied with axis labels. Between each pair of neighboring major ticks, several minor ticks reside. Minor ticks are required when major ticks are far from each other. To set a custom minor tick interval, use the minorTickInterval option. If this option is not set, minor ticks are arranged automatically.

In case your axis displays numbers, assign a numeric value to this option. If the axis displays dates, assign one of the predefined string values. To set the interval to several days, hours, etc., assign an object with the corresponding field specified (days, hours or another field). Note that this object must contain only one of the fields described in this section.

NOTE
The minorTickInterval option can be applied to a continuous axis only. For logarithmic axes, use the minorTickCount option.

minValueMargin

Specifies a coefficient that determines the spacing between the minimum series point and the axis.

Type: Number
Default Value: undefined

When margins are enabled in a chart, an axis extends slightly beyond its min and max values. It is required for preventing the cutting of parts off of the minimum and maximum series points.

By default, margins are calculated automatically and equal to half of an axis' tick interval. If you need to specify custom margins, use the minValueMargin and maxValueMargin options. These options accept coefficients that are used to calculate the actual start and end values for an axis with applied margins. The start value is calculated using the following formula.

startValue = min - (max - min) * minValueMargin

For example, consider that min is 1960 and max is 2010. If you set the minValueMargin option to 0.1, the axis will start in 1955.

startValue = 1960 - (2010 - 1960) * 0.1 = 1960 - 50 * 0.1 = 1960 - 5 = 1955

MinValueMargin ChartJS

To discover how the axis' end value is calculated, refer to the maxValueMargin option description.

NOTE
Margins can be added to axes of the continuous or logarithmic type only.

multipleAxesSpacing

Specifies the spacing, in pixels, between multiple value axes in a chart.

Type: Number
Default Value: 5

Use this option when you have several value axes placed on one side, and the default spacing between them is not appropriate. When set for a valueAxis object, this option specifies the spacing between the axis line and the labels of the axis that is closest to the plot. Thus, there will be no effect if you set this option for the first axis (closest to the plot). You can also set this option for the commonAxisSettings object. In this instance, equal spacing will be set between all the value axes. To learn how to implement multi-axis mode, refer to the Create a Multi-Axis Chart tutorial.

NOTE
If you set an axis placeholderSize that is wider than required for the axis labels, the multipleAxesSpacing will be the spacing between the axis line and the placeholder of the axis that is closest to the plot.

MultipleAxesSpacing ChartJS

name

Specifies the name of the value axis.

Type: String
Default Value: undefined
Cannot be used in themes.

Specify the name of a value axis when displaying several value axes on a single pane. Use the specified axis name when setting the axis property of a series. In this instance, the data source of the series will be used to create the related axis.

Show Example:
jQuery

In this example, different names are assigned to each value axis using the name option. These names are used in code to identify the axes.


                                    

                                    

opacity

Specifies the opacity of the line that represents an axis.

Type: Number
Default Value: undefined

Show Example:
jQuery

In this example, the value axis' opacity option is set to 1.


                                    

                                    

pane

Specifies the pane on which the current value axis will be displayed.

Type: String
Default Value: undefined

In the Create a Multi-Pane Chart tutorial, you can see an example where two value axes are defined and displayed on different panes.

View Demo

placeholderSize

Specifies, in pixels, the space reserved for an axis.

Type: Number
Default Value: null

The scale's height includes the space occupied by the axis labels, axis line and the space between the axis labels and axis line.

AxisPlaceholder ChartJS

position

Specifies the position of the value axis on a chart.

Type: String
Default Value: 'left'
Accepted Values: 'right' | 'left' | 'top' | 'bottom'

The 'left' and 'right' values are appropriate when the value axis is vertical. The 'top' and 'bottom' values are appropriate when the value axis is horizontal. To make the value axis horizontal, use the chart's rotated property.

Show Example:
jQuery

In the example below, the value axis is placed on the right side using the position option.


                                    

                                    

setTicksAtUnitBeginning

Indicates whether or not to set ticks/grid lines of a continuous axis of the 'date-time' type at the beginning of each date-time interval.

Type: Boolean
Default Value: true

This property is used when a continuous axis of the 'date-time' value type is divided. If this property is set to true, axis ticks/grid lines are set at the beginning of date-time units (months, days, years, etc.). The following examples will help you understand the logic:

Tick Interval Start Value Ticks Generated
2 hours 11 (h) : 35 (min) : 25 (s) : 10 (ms) "13 (h) : 00 (min) : 00 (s) : 00 (ms)"; "15 (h): 00 (min) : 00 (s) : 00 (ms)"; ...
2 days 6 (d) : 11 (h) : 35 (min) "8 (d) : 00 (h) : 00 (min)"; "10 (d) : 00 (h) : 00 (min)"; ...
2 months March : 13 (d) "May : 0 (d)"; "July: 0 (d)"; ...

The values that will be generated for the axis can be formatted using the format property (see Data Formatting).

showZero

Specifies whether or not to indicate a zero value on the value axis.

Type: Boolean
Default Value: undefined

When this option is not defined, value axis behaves differently depending on the type of the series that it displays. When the value axis displays area- or bar-like series, it has the zero value indicated. Otherwise, it does not.

You can force the value axis to indicate the zero value no matter what type of series it displays by setting the showZero option to true.

When this option is set to false, the zero value is not indicated until it is included in the displayed series.

Show Example:
jQuery

Toggle the check box below to enable/disable the valueAxis | showZero option.


                                    

                                    

strips[]

Specifies options for value axis strips.

Type: Array
Cannot be used in themes.

Strips are the highlighted areas in a chart within the defined range of values (minimum and maximum) for an axis to which they belong. In general, strips are used to visually represent a range of values behind a series to trace whether the series points' values fall in or out of that range. For more details on strips, refer to the Strips topic.

To define strips for the value axis, use the strips array. Each object in this array should contain the startValue, endValue and color fields specified. Note that specifying all these fields is necessary for a strip to be displayed.

In addition, you can show a label with descriptive information on a strip. To set the text for a label, use the strip's label object. If you need to set similar values for all strips of all axes, use the commonAxisSettings | stripStyle configuration object. It exposes the properties that can be specified for strips of all axes at once. Note that the values specified for the value axis individually (in the valueAxis | strips object) override the values that are specified for all axes (in the commonAxisSettings | stripStyle object).

Show Example:
jQuery

In this example, the value axis strips are defined and colored in a custom color.


                                    

                                    

stripStyle

An object defining configuration options for strip style.

Type: Object

Strips are the highlighted areas of a chart within a defined range of values (maximum and minimum) for an axis to which they belong. In general, strips are used to visually represent a range of values behind a series, to trace whether the series point values fall in or out of that range. For more details on strips, refer to the Strips topic.

To set options for configuring strip style, define the stripStyle object within the argumentAxis or valueAxis configuration object. To set common options for all strips in a chart, define the stripStyle object within the commonAxisSettings configuration object. Note that the values that are set for an individual axis override the corresponding common values.

Show Example:
jQuery

In the example below, the strip label text is blue.


                                    

                                    

synchronizedValue

Specifies the value by which the chart's value axes are synchronized.

Type: Number
Default Value: undefined

Use this option to synchronize one value axis with the others at a certain value. For example, you can synchronize value axes at the zero value. To learn how to implement multi-axis mode, refer to the Create a Multi-Axis Chart tutorial.

Show Example:
jQuery

In the example below, the synchronizedValue option is set to 0 for one of the value axes, and to 1000000000 for another. Note that these values reside on the same horizontal line.


                                    

                                    

tick

An object defining the configuration options for axis ticks.

Type: Object

Ticks divide an axis into equal sections by a step whose value is determined automatically, or by the tickInterval and axisDivisionFactor options of an axis. Ticks improve the readability of charts, but are not visible in the dxChart widget by default. To set up tick configuration options, define the tick object within the argumentAxis or valueAxis configuration object. To set common options for all ticks in a chart, define the tick object within the commonAxisSettings configuration object. Note that the values that are set for an individual axis override the corresponding common values.

Show Example:
jQuery

In this example, the value axis' ticks are visible, with the opacity option set to 0.75.


                                    

                                    

tickInterval

Specifies an interval between axis ticks/grid lines.

Default Value: undefined
Accepted Values: 'millisecond' | 'second' | 'minute' | 'hour' | 'day' | 'week' | 'month' | 'quarter' | 'year'

Use this option to divide the scale by ticks in a specified interval from each other. If this option is not set, ticks are automatically arranged so that their labels do not overlap each other.

In case of a continuous or a logarithmic axis, assign a numeric value to this option.

If the axis is of the date-time type, assign one of the predefined string values or an object to this option. The object's fields specify the number of days, hours etc.

When you use a logarithmic axis, ticks are generated on a base of powers. For example, assume that the logarithm base is 10. Then, if the tick interval is 1, ticks are generated at 0.01, 0.1, 1, 10, 100, 1000, 10000, etc. If the tick interval is 2, ticks are generated at 0.1, 10, 1000, etc.

NOTE
The specified tick interval can be changed internally if its value leads to label overlapping. If you need to prohibit automatic tick arrangement in this situation, specify the valueAxis | label | overlappingBehavior | mode option.

To set the tickInterval option for several axis at once, use the commonAxisSettings configuration object. To set this option for an individual axis, use the argumentAxis or valueAxis configuration object.

Show Example:
jQuery

In the following example, the value axis tick interval is set to 0.2.


                                    

                                    

title

Specifies the title for a value axis.

Type: String|Object

If you only wish to set the text for the axis title, assign the text to the title property directly. If you need to customize title options, set the text property and other properties of the title configuration object. For an overview of axis titles, refer to the Axis Titles topic.

If you need to set similar values for titles of all axes, use the commonAxisSettings | title configuration object. It exposes the properties that can be specified for titles of all axes at once. Note that the values specified for the value axis individually (in the valueAxis | title object) override the values that are specified for all axes (in the commonAxisSettings | title object).

To define a title for an individual value axis, use the properties listed in the valueAxis | title object. In addition, any property of the commonAxisSettings | title configuration object can be added to the individual definition of the value axis title. For example, even though a common margin is specified in the commonAxisSettings, an individual margin can be specified for each axis.

Show Example:
jQuery

In the example below, the value axis title text is assigned directly to the title field.


                                    

                                    

type

Specifies the required type of the value axis.

Type: String
Default Value: undefined
Accepted Values: 'discrete' | 'continuous' | 'logarithmic'

The 'discrete' type is set when string values are specified in the data source of the chart's series. The discrete value axis is divided by the values (called categories) that are specified in a series' data source. The categories order can be specified by the categories property if the order used in the data source is not appropriate.

The 'continuous' type is set when numeric or date-time values are specified in the series data source. The continuous axis is divided automatically.

The 'logarithmic' type can be set when numeric values are specified in the series data source. The logarithmic axis is useful when you visualize a dataset of rapidly-growing values. Each axis tick represents a particular value that is raised to the next power in turn. This particular value is specified by the logarithmBase option. For example, if you set this option to 5, the following ticks will be generated: 50, 51, 52, 53, etc.

On continuous and logarithmic axes, ticks and grid lines are positioned so that their labels do not overlap each other. In addition, you can set a custom maximum axis value (the max option), minimum axis value (the min option) and tick interval (the tickInterval or axisDivisionFactor options).

NOTE
If you require a discrete axis when numeric or date-time values are specified in the data source, set the type option to 'discrete' explicitly.

View Demo

Show Example:
jQuery

This example shows a value axis of a discrete type, which is ordered using the categories option.


                                    

                                    

valueMarginsEnabled

Indicates whether to display series with indents from axis boundaries.

Type: Boolean
Default Value: true

Additionally, if you use a continuous axis, you can specify how far to extend the axis from its maximum and minimum values. Use the axis' minValueMargin and maxValueMargin properties to do this.

Show Example:
jQuery

Use the check box at the bottom to enable/disable value margins for the value axis.


                                    

                                    

valueType

Specifies the desired type of axis values.

Type: String
Default Value: undefined
Accepted Values: 'numeric' | 'datetime' | 'string'

The type of the axis values is determined based on the type of the values specified in the corresponding data source field of the chart's series. If numeric values are specified in the series data source, the axis values will also be of the numeric type. The same logic is used when string or date-time values are specified in the data source.

In some scenarios, you may need the type of the values that are specified in the data source to be converted to another type. In this instance, specify the desired type for the axis values using the valueType property.

NOTE
If dates in your data source are stored as strings, make sure that they have a valid format.
Show Example:
jQuery

In this example, the 'start' and 'finish' fields of the 'dataSource' array are intentionally set in 'numeric' format. To display the values of these fields in 'datetime' format on the chart, the valueType option is used.


                                    

                                    

visible

Indicates whether or not the line that represents an axis in a chart is visible.

Type: Boolean
Default Value: false

Show Example:
jQuery

Use the check box at the bottom to change the visibility of the value axis.


                                    

                                    

width

Specifies the width of the line that represents an axis in the chart.

Type: Number
Default Value: 1

Show Example:
jQuery

In this example, the value axis' width option is set to 3.