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HistogramRangeSliderViewModel

require(["esri/widgets/HistogramRangeSlider/HistogramRangeSliderViewModel"], function(HistogramRangeSliderVM) { /* code goes here */ });
Class: esri/widgets/HistogramRangeSlider/HistogramRangeSliderViewModel
Inheritance: HistogramRangeSliderViewModel SliderViewModel Accessor
Since: ArcGIS API for JavaScript 4.12

Provides the logic for the HistogramRangeSlider widget.

See also:

Constructors

new HistogramRangeSliderViewModel(properties)
Parameter:
properties Object
optional

See the properties for a list of all the properties that may be passed into the constructor.

Property Overview

Any properties can be set, retrieved or listened to. See the Working with Properties topic.
NameTypeSummaryClass
Number

The statistical average of the data in the histogram.

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more detailsHistogramRangeSliderViewModel
Bin[]

An array of objects representing each bin in the histogram.

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more detailsHistogramRangeSliderViewModel
String

The name of the class.

more details
more detailsAccessor
LabelFormatter

A function used to format user inputs.

more details
more detailsSliderViewModel
InputParser

Function used to parse slider inputs formatted by the inputFormatFunction.

more details
more detailsSliderViewModel
LabelFormatter

A modified version of SliderViewModel.labelFormatFunction, which is a custom function used to format labels.

more details
more detailsHistogramRangeSliderViewModel
String[]

An array of strings associated with values generated using an internal label formatter or the values returned from labelFormatFunction.

more details
more detailsSliderViewModel
Number

The maximum possible data/thumb value of the slider.

more details
more detailsSliderViewModel
Number

The minimum possible data/thumb value of the slider.

more details
more detailsSliderViewModel
Number

Defines how slider values should be rounded.

more details
more detailsSliderViewModel
String

Determines the SQL where clause generated in generateWhereClause() for filtering purposes.

more details
more detailsHistogramRangeSliderViewModel
Number

Indicates the standard deviation of the dataset above and below the average.

more details
more detailsHistogramRangeSliderViewModel
String

The state of the view model.

more details
more detailsSliderViewModel
Boolean

When false, the user can freely move any slider thumb to any position along the track.

more details
more detailsSliderViewModel
Number[]

An array of numbers representing absolute thumb positions on the slider.

more details
more detailsSliderViewModel

Property Details

average Number

The statistical average of the data in the histogram. You would typically get this value from the avg property of SummaryStatisticsResult, which is the result of the summaryStatistics function.

Examples:
// sets result returned from a smart mapping method
// to the histogram
histogramSliderVM.average = response.statistics.avg;
histogramSliderVM.average = 34.5;
bins Bin[]

An array of objects representing each bin in the histogram. This information is typically returned from the histogram function.

Examples:
// sets the bins of the histogram from the bins in the histogram() result
histogramVM.bins = histogramResult.bins;
// Creates a histogram with 7 bins.
histogramVM.bins = [
  { minValue: 0, maxValue: 10, count: 4 },
  { minValue: 10.1, maxValue: 20, count: 14 },
  { minValue: 20.1, maxValue: 30, count: 9 },
  { minValue: 30.1, maxValue: 40, count: 34 },
  { minValue: 40.1, maxValue: 50, count: 351 },
  { minValue: 50.1, maxValue: 60, count: 100 },
  { minValue: 60.1, maxValue: 70, count: 1 }
];
declaredClass Stringreadonly inherited

The name of the class. The declared class name is formatted as esri.folder.className.

inputFormatFunction LabelFormatter inherited

A function used to format user inputs. As opposed to labelFormatFunction, which formats thumb labels, the inputFormatFunction formats thumb values in the input element when the user begins to edit them.

The image below demonstrates how slider input values resemble corresponding slider values by default and won't match the formatting set in labelFormatFunction.

Slider without input formatter

If you want to format slider input values so they match thumb labels, you can pass the same function set in labelFormatFunction to inputFormatFunction for consistent formatting.

Slider with input formatter

However, if an inputFormatFunction is specified, you must also write a corresponding inputParseFunction to parse user inputs to understandable slider values. In most cases, if you specify an inputFormatFunction, you should set the labelFormatFunction to the same value for consistency between labels and inputs.

This property overrides the default input formatter, which formats by calling toString() on the input value.

See also:
Example:
// Formats the slider input to abbreviated numbers with units
// e.g. a thumb at position 1500 will render with an input label of 1.5k
slider.inputFormatFunction = function(value, type){
  if(value >= 1000000){
    return (value / 1000000).toPrecision(3) + "m"
  }
  if(value >= 100000){
    return (value / 1000).toPrecision(3) + "k"
  }
  if(value >= 1000){
    return (value / 1000).toPrecision(2) + "k"
  }
  return value.toFixed(0);
}
inputParseFunction InputParser inherited

Function used to parse slider inputs formatted by the inputFormatFunction. This property must be set if an inputFormatFunction is set. Otherwise the slider values will likely not update to their expected positions.

Overrides the default input parses, which is a parsed floating point number.

See also:
Example:
// Parses the slider input (a string value) to a number value understandable to the slider
// This assumes the slider was already configured with an inputFormatFunction
// For example, if the input is 1.5k this function will parse
// it to a value of 1500
slider.inputParseFunction = function(value, type, index){
  var charLength = value.length;
  var valuePrefix = parseFloat(value.substring(0,charLength-1));
  var finalChar = value.substring(charLength-1);

  if(parseFloat(finalChar) >= 0){
    return parseFloat(value);
  }
  if(finalChar === "k"){
    return valuePrefix * 1000;
  }
  if(finalChar === "m"){
    return valuePrefix * 1000000;
  }
  return value;
}
labelFormatFunction LabelFormatter

A modified version of SliderViewModel.labelFormatFunction, which is a custom function used to format labels. Overrides the default label formatter.

labels String[]readonly inherited

An array of strings associated with values generated using an internal label formatter or the values returned from labelFormatFunction.

The maximum possible data/thumb value of the slider. In the constructor, if one of the values specified in values is greater than the max value specified in this property, then the max will update to the highest value in values.

Example:
sliderViewModel.max = 100;

The minimum possible data/thumb value of the slider. In the constructor, if one of the values specified in values is less than the min value specified in this property, then the min will update to the lowest value in values.

Example:
sliderViewModel.min = 0;
precision Number inherited

Defines how slider values should be rounded. This number indicates the number of decimal places slider values should round to when they have been moved.

This value also indicates the precision of thumb labels when the data range (max - min) is less than 10.

When the data range is larger than 10, labels display with a precision of no more than two decimal places, though actual slider thumb values will maintain the precision specified in this property.

For example, given the default precision of 4, and the following slider configuration, The label of the thumb will display two decimal places, but the precision of the actual thumb value will not be lost even when the user slides or moves the thumb.

const slider = new SliderVM({
  min: 20,
  max: 100,  // data range of 80
  values: [50.4331],
  // thumb label will display 50.43
  // thumb value will maintain precision, so
  // value will remain at 50.4331
});

If the user manually enters a value that has a higher precision than what's indicated by this property, the precision of that thumb value will be maintained until the thumb is moved by the user. At that point, the value will be rounded according to the indicated precision.

If thumb labels aren't visible, they must be enabled with labelInputsEnabled.

Keep in mind this property rounds thumb values and shouldn't be used exclusively for formatting purposes. To format thumb labels, use the labelFormatFunction property.

Default Value:4
Example:
sliderViewModel.precision = 7;
rangeType String

Determines the SQL where clause generated in generateWhereClause() for filtering purposes. The value set here determines the number of values allowed on the slider.

See the table below for a description and requirements of all possible values. value1 refers to the value of the first thumb position. value2 refers to the value of the final thumb position, if applicable.

Possible ValueNumber of ValuesWhere clause
equal1${field} = ${value1}
not-equal1${field} <> ${value1}
less-than1${field} < ${value1}
greater-than1${field} > ${value1}
at-most1${field} <= ${value1}
at-least1${field} >= ${value1}
between2${field} BETWEEN ${value1} AND ${value2}
not-between2${field} NOT BETWEEN ${value1} AND ${value2}

Possible Values:"equal"|"not-equal"|"less-than"|"greater-than"|"at-most"|"at-least"|"between"|"not-between"

Default Value:equal
See also:
Example:
// renders the histogram so that all bins between
// the two handles are shaded with a blue color
slider.viewModel.rangeType = "between";

// filters the layer view based on the configuration
// of the slider
layerView.filter = {
  where: slider.viewModel.generateWhereClause("POPULATION")
};

// if slider min is 1,000 and max is 10,000, the following is generated
// layerView.filter.where = 'POPULATION >= 1000 AND POPULATION <= 10000'
standardDeviation Number

Indicates the standard deviation of the dataset above and below the average.

Example:
// stddev returned from summaryStatistics
slider.viewModel.standardDeviation = stats.stddev;
state Stringreadonly inherited

The state of the view model.

Possible Values:"ready"|"disabled"

thumbsConstrained Boolean inherited

When false, the user can freely move any slider thumb to any position along the track. By default, a thumb's position is constrained to the positions of neighboring thumbs so you cannot move one thumb past another. Set this property to false to disable this constraining behavior.

Default Value:true
Example:
// allows the user to freely move slider
// thumbs to any position along the track
slider.viewModel.thumbsConstrained = false;

An array of numbers representing absolute thumb positions on the slider.

See also:
Example:
const slider = new SliderVM({
  min: 20,
  max: 100,  // data range of 80
  values: [50.4331],
  // thumb label will display 50.43
  // thumb value will maintain precision, so
  // value will remain at 50.4331
});

Method Overview

NameReturn TypeSummaryClass
String

The default input format function available for use as a fallback in custom formatting implementations.

more details
more detailsSliderViewModel
Number

The default input parsing function available for use as a fallback in custom parsing implementations.

more details
more detailsSliderViewModel
String

The default label format function, available for use as a fallback in custom formatting implementations.

more details
more detailsSliderViewModel
Boolean

Emits an event on the instance.

more details
more detailsSliderViewModel
String

Generates a SQL where clause based on a given field and the slider's rangeType.

more details
more detailsHistogramRangeSliderViewModel
Object

Returns the min and max bounds for a 'value' at the provided index.

more details
more detailsSliderViewModel
String

Returns the formatted label for a provided value.

more details
more detailsSliderViewModel
Boolean

Indicates whether there is an event listener on the instance that matches the provided event name.

more details
more detailsSliderViewModel
Object

Registers an event handler on the instance.

more details
more detailsSliderViewModel

Updates a thumb value based on the provided index.

more details
more detailsSliderViewModel
String

Rounds the given value to the number of decimal places specified in the precision property set on the view model.

more details
more detailsSliderViewModel

Method Details

defaultInputFormatFunction(value){String}inherited

The default input format function available for use as a fallback in custom formatting implementations.

Parameter:
value Number

The input value to format.

Returns:
TypeDescription
StringThe formatted input value.
defaultInputParseFunction(value){Number}inherited

The default input parsing function available for use as a fallback in custom parsing implementations.

Parameter:
value String

The thumb value to parse.

Returns:
TypeDescription
NumberThe parsed thumb value.
defaultLabelFormatFunction(value){String}inherited

The default label format function, available for use as a fallback in custom formatting implementations.

Parameter:
value Number

The thumb value to format.

Returns:
TypeDescription
StringThe formatted thumb value.
emit(type, event){Boolean}inherited

Emits an event on the instance. This method should only be used when creating subclasses of this class.

Parameters:
type String

The name of the event.

event Object
optional

The event payload.

Returns:
TypeDescription
Booleantrue if a listener was notified
generateWhereClause(field){String}

Generates a SQL where clause based on a given field and the slider's rangeType. This is a convenience function for data filtering or data queries.

Parameter:
field String

Name of the field used in the where clause. This field should correspond to the data used to generate the histogram associated with the slider.

Returns:
TypeDescription
StringThe SQL where clause to apply to a filter or query.
See also:
Example:
// renders the histogram so that all bins between
// the two handles are shaded with a blue color by default
slider.viewModel.rangeType = "between";

// filters the layerview based on the configuration
// of the slider
layerView.filter = {
  where: slider.viewModel.generateWhereClause("POPULATION")
}
getBoundsForValueAtIndex(index){Object}inherited

Returns the min and max bounds for a 'value' at the provided index. Also used internally to provide accessibility information via HTMLElement properties

Parameter:
index Number

The index of the associated value.

Returns:
TypeDescription
ObjectReturns a simple object with bound information.
getLabelForValue(value, type, index){String}inherited

Returns the formatted label for a provided value.

Parameters:
value Number

The value from which to retrieve a formatted label.

type String
optional

The label type.

Possible Values:"min"|"max"|"tick"|"values"

index Number
optional

The index of the label.

Returns:
TypeDescription
StringReturns the formatted label.
hasEventListener(type){Boolean}inherited

Indicates whether there is an event listener on the instance that matches the provided event name.

Parameter:
type String

The name of the event.

Returns:
TypeDescription
BooleanReturns true if the class supports the input event.
on(type, listener){Object}inherited

Registers an event handler on the instance. Call this method to hook an event with a listener.

Parameters:

A event type, or an array of event types, to listen for.

listener Function

The function to call when the event is fired.

Returns:
TypeDescription
ObjectReturns an event handler with a remove() method that can be called to stop listening for the event(s).
PropertyTypeDescription
removeFunctionWhen called, removes the listener from the event.
Example:
view.on("click", function(event){
  // event is the event handle returned after the event fires.
  console.log(event.mapPoint);
});
setValue(index, value)inherited

Updates a thumb value based on the provided index. The provided value must differ from the previous value. The provided value must also be between the min and max.

Parameters:
index Number

The index of the thumb value in the associated values array.

value Number

The new value to replace with the old value.

toPrecision(value){String}inherited
Since: ArcGIS API for JavaScript 4.14

Rounds the given value to the number of decimal places specified in the precision property set on the view model.

Parameter:
value Number

The thumb value to format.

Returns:
TypeDescription
StringThe input value rounded to the number of places specified in precision.
See also:

Event Overview

NameTypeSummaryClass
{oldValue: Number,type: "max",value: Number}

Fires when a user changes the max value of the slider.

more details
more detailsSliderViewModel
{oldValue: Number,type: "min",value: Number}

Fires when a user changes the min value of the slider.

more details
more detailsSliderViewModel

Event Details

max-changeinherited

Fires when a user changes the max value of the slider.

Properties:
oldValue Number

The former max value (or bound) of the slider.

type String

The type of the event.

The value is always "max".

value Number

The value of the max value (or bound) of the slider when the event is emitted.

min-changeinherited

Fires when a user changes the min value of the slider.

Properties:
oldValue Number

The former min value (or bound) of the slider.

type String

The type of the event.

The value is always "min".

value Number

The value of the min value (or bound) of the slider when the event is emitted.

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