require(["esri/widgets/HistogramRangeSlider/HistogramRangeSliderViewModel"], (HistogramRangeSliderVM) => { /* code goes here */ });
import HistogramRangeSliderVM from "@arcgis/core/widgets/HistogramRangeSlider/HistogramRangeSliderViewModel.js";
esri/widgets/HistogramRangeSlider/HistogramRangeSliderViewModel
Provides the logic for the HistogramRangeSlider widget.
Constructors
-
Parameterproperties Objectoptional
See the properties for a list of all the properties that may be passed into the constructor.
Property Overview
Name | Type | Summary | Class |
---|---|---|---|
The statistical average of the data in the histogram. | HistogramRangeSliderViewModel | ||
An array of objects representing each bin in the histogram. | HistogramRangeSliderViewModel | ||
The name of the class. | Accessor | ||
When set, the user is restricted from moving slider thumbs to positions higher than this value. | SliderViewModel | ||
When set, the user is restricted from moving slider thumbs to positions less than this value. | SliderViewModel | ||
A function used to format user inputs. | SliderViewModel | ||
Function used to parse slider inputs formatted by the inputFormatFunction. | SliderViewModel | ||
A modified version of SliderViewModel.labelFormatFunction, which is a custom function used to format labels. | HistogramRangeSliderViewModel | ||
An array of strings associated with values generated using an internal label formatter or the values returned from labelFormatFunction. | SliderViewModel | ||
The maximum possible data/thumb value of the slider. | SliderViewModel | ||
The minimum possible data/thumb value of the slider. | SliderViewModel | ||
Defines how slider values should be rounded. | SliderViewModel | ||
Determines the SQL where clause generated in generateWhereClause() for filtering purposes. | HistogramRangeSliderViewModel | ||
Indicates the standard deviation of the dataset above and below the | HistogramRangeSliderViewModel | ||
The state of the view model. | SliderViewModel | ||
When | SliderViewModel | ||
An array of numbers representing absolute thumb positions on the slider. | SliderViewModel |
Property Details
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average
average Number
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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;
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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 } ];
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effectiveMax
InheritedPropertyeffectiveMax Number
Inherited from SliderViewModelSince: ArcGIS Maps SDK for JavaScript 4.23SliderViewModel since 4.12, effectiveMax added at 4.23. -
When set, the user is restricted from moving slider thumbs to positions higher than this value. This value should be less than the slider max. The
effectiveMax
and effectiveMin allow you to represent ranges of values in a dataset that cannot be filtered or selected with the slider. This can be useful when using the slider to represent datasets with outliers, or scale ranges not suitable for a layer.Example// slider.viewModel.max = 100 slider.viewModel.effectiveMax = 60; // now the user cannot slide thumbs above // 60 even though the slider track displays // values up to 100.
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effectiveMin
InheritedPropertyeffectiveMin Number
Inherited from SliderViewModelSince: ArcGIS Maps SDK for JavaScript 4.23SliderViewModel since 4.12, effectiveMin added at 4.23. -
When set, the user is restricted from moving slider thumbs to positions less than this value. This value should be greater than the slider min. The
effectiveMin
and effectiveMax allow you to represent ranges of values in a dataset that cannot be filtered or selected with the slider. This can be useful when using the slider to represent datasets with outliers, or scale ranges not suitable for a layer.Example// slider.viewModel.min = 0 slider.viewModel.effectiveMin = 4; // now the user cannot slide thumbs below // 4 even though the slider track displays // values down to 0.
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inputFormatFunction
InheritedPropertyinputFormatFunction LabelFormatter
Inherited from SliderViewModel -
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
.If you want to format slider input values so they match thumb labels, you can pass the same function set in
labelFormatFunction
toinputFormatFunction
for consistent formatting.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 aninputFormatFunction
, 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); }
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inputParseFunction
InheritedPropertyinputParseFunction InputParser
Inherited from SliderViewModel -
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){ let charLength = value.length; let valuePrefix = parseFloat(value.substring(0,charLength-1)); let 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; }
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labelFormatFunction
labelFormatFunction LabelFormatter
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A modified version of SliderViewModel.labelFormatFunction, which is a custom function used to format labels. Overrides the default label formatter.
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Inherited from SliderViewModel
-
An array of strings associated with values generated using an internal label formatter or the values returned from labelFormatFunction.
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max
InheritedPropertymax Number
Inherited from SliderViewModel -
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 themax
will update to the highest value invalues
.ExamplesliderViewModel.max = 100;
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min
InheritedPropertymin Number
Inherited from SliderViewModel -
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 themin
will update to the lowest value invalues
.ExamplesliderViewModel.min = 0;
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precision
InheritedPropertyprecision Number
Inherited from SliderViewModel -
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
ExamplesliderViewModel.precision = 7;
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rangeType
rangeType String
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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 Value Number of Values Where clause equal 1 ${field} = ${value1}
not-equal 1 ${field} <> ${value1}
less-than 1 ${field} < ${value1}
greater-than 1 ${field} > ${value1}
at-most 1 ${field} <= ${value1}
at-least 1 ${field} >= ${value1}
between 2 ${field} BETWEEN ${value1} AND ${value2}
not-between 2 ${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'
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standardDeviation
standardDeviation Number
-
Indicates the standard deviation of the dataset above and below the
average
.Example// stddev returned from summaryStatistics slider.viewModel.standardDeviation = stats.stddev;
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state
InheritedPropertystate Stringreadonly
Inherited from SliderViewModel -
The state of the view model.
Possible Values:"ready" |"disabled"
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thumbsConstrained
InheritedPropertythumbsConstrained Boolean
Inherited from SliderViewModel -
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 tofalse
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;
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Inherited from SliderViewModel
-
An array of numbers representing absolute thumb positions on the slider.
- See also
Exampleconst 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
Name | Return Type | Summary | Class |
---|---|---|---|
Adds one or more handles which are to be tied to the lifecycle of the object. | Accessor | ||
The default input format function available for use as a fallback in custom formatting implementations. | SliderViewModel | ||
The default input parsing function available for use as a fallback in custom parsing implementations. | SliderViewModel | ||
The default label format function, available for use as a fallback in custom formatting implementations. | SliderViewModel | ||
Emits an event on the instance. | SliderViewModel | ||
Generates a SQL where clause based on a given field and the slider's rangeType. | HistogramRangeSliderViewModel | ||
Returns the effective bounds of the slider. | SliderViewModel | ||
Returns the min and max bounds for a 'value' at the provided index. | SliderViewModel | ||
Returns the formatted label for a provided value. | SliderViewModel | ||
Indicates whether there is an event listener on the instance that matches the provided event name. | SliderViewModel | ||
Returns true if a named group of handles exist. | Accessor | ||
Registers an event handler on the instance. | SliderViewModel | ||
Removes a group of handles owned by the object. | Accessor | ||
Updates a thumb value based on the provided index. | SliderViewModel | ||
Rounds the given value to the number of decimal places specified in the precision property set on the view model. | SliderViewModel |
Method Details
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Inherited from Accessor
Since: ArcGIS Maps SDK for JavaScript 4.25Accessor since 4.0, addHandles added at 4.25. -
Adds one or more handles which are to be tied to the lifecycle of the object. The handles will be removed when the object is destroyed.
// Manually manage handles const handle = reactiveUtils.when( () => !view.updating, () => { wkidSelect.disabled = false; }, { once: true } ); this.addHandles(handle); // Destroy the object this.destroy();
ParametershandleOrHandles WatchHandle|WatchHandle[]Handles marked for removal once the object is destroyed.
groupKey *optionalKey identifying the group to which the handles should be added. All the handles in the group can later be removed with Accessor.removeHandles(). If no key is provided the handles are added to a default group.
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defaultInputFormatFunction
InheritedMethoddefaultInputFormatFunction(value){String}
Inherited from SliderViewModel -
The default input format function available for use as a fallback in custom formatting implementations.
Parametervalue NumberThe input value to format.
ReturnsType Description String The formatted input value.
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defaultInputParseFunction
InheritedMethoddefaultInputParseFunction(value){Number}
Inherited from SliderViewModel -
The default input parsing function available for use as a fallback in custom parsing implementations.
Parametervalue StringThe thumb value to parse.
ReturnsType Description Number The parsed thumb value.
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defaultLabelFormatFunction
InheritedMethoddefaultLabelFormatFunction(value){String}
Inherited from SliderViewModel -
The default label format function, available for use as a fallback in custom formatting implementations.
Parametervalue NumberThe thumb value to format.
ReturnsType Description String The formatted thumb value.
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emit
InheritedMethodemit(type, event){Boolean}
Inherited from SliderViewModel -
Emits an event on the instance. This method should only be used when creating subclasses of this class.
ReturnsType Description Boolean true
if a listener was notified
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generateWhereClause
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.
Parameterfield StringName of the field used in the where clause. This field should correspond to the data used to generate the histogram associated with the slider.
ReturnsType Description String The SQL where clause to apply to a filter or query. 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") }
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getBounds
InheritedMethodgetBounds(){Bounds}
Inherited from SliderViewModelSince: ArcGIS Maps SDK for JavaScript 4.23SliderViewModel since 4.12, getBounds added at 4.23. -
Returns the effective bounds of the slider. If effectiveMin and effectiveMax are set on the slider, then those values will be returned. If not, then the min and max are returned.
ReturnsType Description Bounds The effective bounds of the slider.
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getBoundsForValueAtIndex
InheritedMethodgetBoundsForValueAtIndex(index){Object}
Inherited from SliderViewModel -
Returns the min and max bounds for a 'value' at the provided index. Also used internally to provide accessibility information via HTMLElement properties
Parameterindex NumberThe index of the associated value.
ReturnsType Description Object Returns a simple object with bound information.
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getLabelForValue
InheritedMethodgetLabelForValue(value, type, index){String}
Inherited from SliderViewModel -
Returns the formatted label for a provided value.
ParametersReturnsType Description String Returns the formatted label.
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hasEventListener
InheritedMethodhasEventListener(type){Boolean}
Inherited from SliderViewModel -
Indicates whether there is an event listener on the instance that matches the provided event name.
Parametertype StringThe name of the event.
ReturnsType Description Boolean Returns true if the class supports the input event.
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hasHandles
InheritedMethodhasHandles(groupKey){Boolean}
Inherited from AccessorSince: ArcGIS Maps SDK for JavaScript 4.25Accessor since 4.0, hasHandles added at 4.25. -
Returns true if a named group of handles exist.
ParametergroupKey *optionalA group key.
ReturnsType Description Boolean Returns true
if a named group of handles exist.Example// Remove a named group of handles if they exist. if (obj.hasHandles("watch-view-updates")) { obj.removeHandles("watch-view-updates"); }
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on
InheritedMethodon(type, listener){Object}
Inherited from SliderViewModel -
Registers an event handler on the instance. Call this method to hook an event with a listener.
ParametersReturnsType Description Object Returns an event handler with a remove()
method that should be called to stop listening for the event(s).Property Type Description remove Function When called, removes the listener from the event. Exampleview.on("click", function(event){ // event is the event handle returned after the event fires. console.log(event.mapPoint); });
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Inherited from Accessor
Since: ArcGIS Maps SDK for JavaScript 4.25Accessor since 4.0, removeHandles added at 4.25. -
Removes a group of handles owned by the object.
ParametergroupKey *optionalA group key or an array or collection of group keys to remove.
Exampleobj.removeHandles(); // removes handles from default group obj.removeHandles("handle-group"); obj.removeHandles("other-handle-group");
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Inherited from SliderViewModel
-
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
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toPrecision
InheritedMethodtoPrecision(value){String}
Inherited from SliderViewModelSince: ArcGIS Maps SDK for JavaScript 4.14SliderViewModel since 4.12, toPrecision added at 4.14. -
Rounds the given value to the number of decimal places specified in the precision property set on the view model.
Parametervalue NumberThe thumb value to format.
Returns- See also