ValueAxis | JavaScript Charts v. 3 | amCharts

Inheritance: ValueAxis → AxisBase

Extension for ValueAxis to create an axis for AmSerialChart, AmRadarChart, AmXYChart charts, multiple can be assigned.
Gets automatically populated, one for AmSerialChart and two for AmXYChart charts, if none has been specified.

### Example

    var chart = AmCharts.makeChart("chartdiv",{
      ...
      "valueAxes": [
        {
          "title": "Axis title"
        }
      ]
    });

### Properties Hide inherited Show inherited

Property | Type | Default | Description
--- | --- | --- | ---
autoGridCount | Boolean | true | Specifies whether number of gridCount is specified automatically, acoarding to the axis size.
autoRotateAngle | Number |  | Angle of label rotation, if the number of series exceeds autoRotateCount. Works on horizontal axis only. It is not recommended to use it with charts with zoom/scroll features, as chart adjusts margin only based on initial render.
autoRotateCount | Number |  | If the number of category axis items will exceed the autoRotateCount, the labels will be rotated by autoRotateAngle degree. Works on horizontal axis only. Not recommended with scrollable/zoomable charts.
autoWrap | Boolean | false | If this is set to true and the label does not fit, it will be wrapped. Works only on horizontal value axes.
axisAlpha | Number | 1 | Axis opacity. Value range is 0 - 1.
axisColor | Color | #000000 | Axis color.
axisFrequency | Number | 1 | Works with Radar chart only. If you have a big number of axes, this property will help you to show every x axis only.
axisThickness | Number | 1 | Thickness of the axis.
axisTitleOffset | Number | 10 | Radar chart only. Specifies distance from axis to the axis title (category)
axisX | Number |  | Read-only. Returns x coordinate of the axis.
axisY | Number |  | Read-only. Returns y coordinate of the axis.
balloon | AmBalloon | AmBalloon | Allows customizing axes balloons individually.
balloonTextFunction | Object |  | You can use this function to format balloon text of the axis. This function is called and balloon text or date (if axis is date-based) is passed as an argument. It should return string which will be displayed in the balloon.
baseCoord | Number |  | Read-only. Coordinate of the base value.
baseValue | Number | 0 | Specifies base value of the axis.
boldLabels | Boolean | false | Specifies if axis labels should be bold or not.
boldPeriodBeginning | Boolean | true | When parse dates is on for the category axis, the chart will try to highlight the beginning of the periods, like month, in bold. Set this to false to disable the functionality.
centerLabelOnFullPeriod | Boolean | true | This setting works only when parseDates is set to true and equalSpacing is set to false. In case you set it to false, labels will never be centered between grid lines.
centerLabels | Boolean | false | Force-centers labels of date-based axis (in case it's category axis, equalSpacing must be false)
centerRotatedLabels | Boolean | false | In case you have rotated labels on horizontal axis, you can force-center them using this property.
color | Color |  | Color of axis value labels. Will use chart's color if not set.
dashLength | Number | 0 | Length of a dash. 0 means line is not dashed.
dateFormats | Array[Object] | [{"period":"fff","format":"JJ:NN:SS"},{"period":"ss","format":"JJ:NN:SS"},{"period":"mm","format":"JJ:NN"},{"period":"hh","format":"JJ:NN"},{"period":"DD","format":"MMM DD"},{"period":"WW","format":"MMM DD"},{"period":"MM","format":"MMM"},{"period":"YYYY","format":"YYYY"}] | Date formats of different periods. Possible period values: fff - milliseconds, ss - seconds, mm - minutes, hh - hours, DD - days, MM - months, WW - weeks, YYYY - years. Check this page for date formatting strings.
duration | String |  | If your values represents time units, and you want value axis labels to be formatted as duration, you have to set the duration unit. Possible values are: "ss", "mm", "hh" and "DD".
durationUnits | Object | {DD:'d. ', hh:':', mm:':',ss:''} | If duration property is set, you can specify what string should be displayed next to day, hour, minute and second.
fillAlpha | Number | 0 | Fill opacity. Every second space between grid lines can be filled with color. Set fillAlpha to a value greater than 0 to see the fills.
fillColor | Color | #FFFFFF | Fill color. Every second space between grid lines can be filled with color. Set fillAlpha to a value greater than 0 to see the fills.
firstDayOfWeek | Number | 1 | Sets first day of the week. 0 is Sunday, 1 is Monday, etc.
fontSize | Number |  | Size of value labels text. Will use chart's fontSize if not set.
gridAlpha | Number | 0.15 | Opacity of grid lines.
gridColor | Color | #000000 | Color of grid lines.
gridCount | Number | 5 | Number of grid lines. In case this is value axis, or your categoryAxis parses dates, the number is approximate. The default value is 5. If you set autoGridCount to true, this property is ignored.
gridThickness | Number | 1 | Thickness of grid lines.
gridType | String | polygons | Radar chart only. Possible values are: "polygons" and "circles". Set "circles" for polar charts.
guides | Array[Guide] | [] | The array of guides belonging to this axis.
id | String |  | Unique id of value axis. It is not required to set it, unless you need to tell the graph which exact value axis it should use.
ignoreAxisWidth | Boolean | false | If autoMargins of a chart is set to true, but you want this axis not to be measured when calculating margin, set ignoreAxisWidth to true.
includeAllValues | Boolean | false | If you set it to true, minimum and maximum of value axis will not change while zooming/scrolling.
includeGuidesInMinMax | Boolean | false | Specifies whether guide values should be included when calculating min and max of the axis.
includeHidden | Boolean | false | If true, the axis will include hidden graphs when calculating min and max values.
inside | Boolean | false | Specifies whether values should be placed inside or outside plot area.
integersOnly | Boolean | false | Specifies whether values on axis can only be integers or both integers and doubles.
labelFrequency | Number | 1 | Frequency at which labels should be placed. Doesn't work for CategoryAxis if parseDates is set to true.
labelFunction |  |  | You can use this function to format Value axis labels. This function is called and these parameters are passed: labelFunction(value, valueText, valueAxis); Where value is numeric value, valueText is formatted string and valueAxis is a reference to valueAxis object. If axis type is "date", labelFucntion will pass different arguments: labelFunction(valueText, date, valueAxis) Your function should return string.
labelOffset | Number | 0 | You can use it to adjust position of axes labels. Works both with CategoryAxis and ValueAxis.
labelRotation | Number | 0 | Rotation angle of a label. Only horizontal axis' values can be rotated. If you set this for vertical axis, the setting will be ignored. Possible values from -90 to 90.
labelsEnabled | Boolean | true | Specifies whether axis displays category axis' labels and value axis' values.
listeners | Array[Object] |  | You can add listeners of events using this property. Example: listeners = [{"event":"clickItem", "method":handleEvent}];
logarithmic | Boolean | false | Specifies if this value axis' scale should be logarithmic.
markPeriodChange | Boolean | true | If you set it to false, the start of longer periods won't use a different date format and won't be bold.
max | Number |  | Read-only. Maximum value of the axis.
maximum | Number |  | If you don't want max value to be calculated by the chart, set it using this property. This value might still be adjusted so that it would be possible to draw grid at rounded intervals.
maximumDate | Date |  | If your value axis is date-based, you can specify maximum date of the axis. Can be set as date object, timestamp number or string if dataDateFormat is set.
min | Number |  | Read-only. Minimum value of the axis.
minHorizontalGap | Number | 75 | This property is used when calculating grid count (when autoGridCount is true). It specifies minimum cell width required for one span between grid lines.
minimum | Number |  | If you don't want min value to be calculated by the chart, set it using this property. This value might still be adjusted so that it would be possible to draw grid at rounded intervals.
minimumDate | Date |  | If your value axis is date-based, you can specify minimum date of the axis. Can be set as date object, timestamp number or string if dataDateFormat is set.
minMaxMultiplier | Number | 1 | If set value axis scale (min and max numbers) will be multiplied by it. I.e. if set to 1.2 the scope of values will increase by 20%.
minorGridAlpha | Number | 0.07 | Opacity of minor grid. In order minor to be visible, you should set minorGridEnabled to true.
minorGridEnabled | Boolean | false | Specifies if minor grid should be displayed. NOTE: If equalSpacing is set to true, this setting will be ignored.
minorTickLength | Number | 0 | Length of minor grid tick.
minPeriod | String | DD | Specifies the shortest period of your data. This will work only if you set the `type` of your value axis to `"date"`. Possible period values: fff - milliseconds, ss - seconds, mm - minutes, hh - hours, DD - days, MM - months, YYYY - years. It's also possible to supply a number for increments, i.e. "15mm" which will instruct the chart that your data is supplied in 15 minute increments.
minVerticalGap | Number | 35 | This property is used when calculating grid count (when autoGridCount is true). It specifies minimum cell height required for one span between grid lines.
offset | Number | 0 | The distance of the axis to the plot area, in pixels. Negative values can also be used.
pointPosition | String | axis | Works with radar charts only. If you set it to “middle”, labels and data points will be placed in the middle between axes.
position | String | left | Possible values are: "top", "bottom", "left", "right". If axis is vertical, default position is "left". If axis is horizontal, default position is "bottom".
precision | Number |  | Precision (number of decimals) of values.
radarCategoriesEnabled | Boolean | true | Radar chart only. Specifies if categories (axes' titles) should be displayed near axes)
recalculateToPercents | Boolean | false | Specifies if graphs's values should be recalculated to percents.
reversed | Boolean | false | Specifies if value axis should be reversed (smaller values on top).
showFirstLabel | Boolean | true | Whether to show first axis label or not. This works properly only on ValueAxis. With CategoryAxis it wont work 100%, it depends on the period, zooming, etc. There is no guaranteed way to force category axis to show or hide first label.
showLastLabel | Boolean | true | Whether to show last axis label or not. This works properly only on ValueAxis. With CategoryAxis it wont work 100%, it depends on the period, zooming, etc. There is no guaranteed way to force category axis to show or hide last label.
stackType | String | none | Stacking mode of the axis. Possible values are: "none", "regular", "100%", "3d". Note, only graphs of one type will be stacked.
step | Number |  | Read-only. Value difference between two grid lines.
strictMinMax | Boolean | false | If you set minimum and maximum for your axis, chart adjusts them so that grid would start and end on the beginning and end of plot area and grid would be at equal intervals. If you set strictMinMax to true, the chart will not adjust minimum and maximum of value axis.
synchronizationMultiplier | Number |  | In case you synchronize one value axis with another, you need to set the synchronization multiplier. Use synchronizeWithAxis method to set with which axis it should be synced.
synchronizeWith | ValueAxis |  | One value axis can be synchronized with another value axis. You can use both reference to your axis or id of the axis here. You should set synchronizationMultiplyer in order for this to work.
tickLength | Number | 5 | Length of the tick marks.
title | String |  | Title of the axis.
titleBold | Boolean | true | Specifies if title should be bold or not.
titleColor | Color |  | Color of axis title. Will use text color of chart if not set any.
titleFontSize | Number |  | Font size of axis title. Will use font size of chart plus two pixels if not set any.
titleRotation | Number |  | Rotation of axis title. Useful if you want to make vertical axis title to be shown from top to down.
totalText | String |  | If this value axis is stacked and has columns, setting valueAxis.totalText = "[[total]]" will make it to display total value above the most-top column.
totalTextColor | Color |  | Color of total text.
totalTextOffset | Number | 0 | Distance from data point to total text.
treatZeroAs | Number | 0 | This allows you to have logarithmic value axis and have zero values in the data. You must set it to >0 value in order to work.
type | String | numeric | Type of value axis. If your values in data provider are dates and you want this axis to show dates instead of numbers, set it to "date".
unit | String |  | Unit which will be added to the value label.
unitPosition | String | right | Position of the unit. Possible values are "left" and "right".
usePrefixes | Boolean | false | If true, prefixes will be used for big and small numbers. You can set arrays of prefixes directly to the chart object via prefixesOfSmallNumbers and prefixesOfBigNumbers.
useScientificNotation | Boolean | false | If true, values will always be formatted using scientific notation (5e+8, 5e-8...) Otherwise only values bigger then 1e+21 and smaller then 1e-7 will be displayed in scientific notation.
zeroGridAlpha | Number |  | Opacity of a zero grid line. By default it is equal to 2 x gridAlpha.

### Methods Hide inherited Show inherited

Name | Parameters | Returns | Description
--- | --- | --- | ---
addGuide(guide) | guide - instance of Guide |  | Adds guide to the axis.
addListener(type, handler) | type - string like 'axisChanged' (should be listed in 'events' section of this class or classes which extend this class). handler - function which is called when event happens |  | Adds event listener to the object.
coordinateToValue(coordinate) | coordinate - y or x coordinate, in pixels. | Number, - value of coordinate. | Returns value of the coordinate.
getCoordinate(value) | value - Number | Number - coordinate | Returns coordinate of the value in pixels.
removeGuide(guide) | guide - instance of Guide |  | Removes guide from the axis.
removeListener(obj, type, handler) |  |  | Removes event listener from the object
synchronizeWithAxis(axis) | axis - instance of ValueAxis. |  | One value axis can be synchronized with another value axis. You should set synchronizationMultiplyer in order for this to work.
zoomOut() |  |  | Zooms out the value axis to full scale.
zoomToValues(startValue, endValue) |  |  | Zooms-in the axis to the provided values.

### Events Hide inherited Show inherited

Name | Event object | Description
--- | --- | ---
axisChanged | {type:"axisChanged", chart:AmChart} | Dispatched when value axis min/max values are changed.
axisZoomed | {type:"axisZoomed", startValue:startValue, endValue:endValue, chart:AmChart} | Dispatched when axis is zoomed.
clickGuide | {type: "clickGuide", guide:Guide, chart:AmRectangularChart} | Dispatched when user clicks on a guide.
clickItem | {type: "clickItem", value:value, serialDataItem:SerialDataItem, axis:AxisBase, target:label, chart:AmRectangularChart, event:MouseEvent} | Fired if user clicks on axis label.
logarithmicAxisFailed | {type:"logarithmicAxisFailed", chart:AmChart} | Dispatched when valueAxis is logarithmic and values equal or less then zero were found in data.
rollOutGuide | {type: "rollOutGuide", guide:Guide, chart:AmRectangularChart} | Dispatched when user rolls-out of the guide.
rollOutItem | {type: "rollOutItem", value:value, serialDataItem:SerialDataItem, axis:AxisBase, target:label, chart:AmRectangularChart, event:MouseEvent} | Fired if user rolls-out of the axis label.
rollOutItem | {type: "rollOutItem", value:value, serialDataItem:SerialDataItem, axis:AxisBase, target:label, chart:AmRectangularChart, event:MouseEvent} | Fired if user rolls-out of the axis label.
rollOverGuide | {type: "rollOverGuide", guide:Guide, chart:AmRectangularChart} | Dispatched when user rolls-over some guide.
rollOverItem | {type: "rollOverItem", value:value, serialDataItem:SerialDataItem, axis:AxisBase, target:label, chart:AmRectangularChart, event:MouseEvent} | Fired if user rolls-over axis label.