require(["esri/widgets/Histogram/HistogramViewModel"], (HistogramVM) => { /* code goes here */ });
import HistogramVM from "@arcgis/core/widgets/Histogram/HistogramViewModel.js";
esri/widgets/Histogram/HistogramViewModel
Provides the logic for the Histogram widget.
Constructors
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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 |
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The statistical average of the data in the histogram. | HistogramViewModel | ||
The range of values for the histogram calculated from the bins. | HistogramViewModel | ||
An array of objects representing each bin in the histogram. | HistogramViewModel | ||
The name of the class. | Accessor | ||
A function used to format labels. | HistogramViewModel | ||
The maximum value or bound of the entire histogram. | HistogramViewModel | ||
The minimum value or bound of the entire histogram. | HistogramViewModel | ||
The range of values for the histogram. | HistogramViewModel | ||
The current state of the view model. | HistogramViewModel |
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.When set, this value will render on the histogram with a symbol indicating it is the average.
Examples// sets result returned from a smart mapping method // to the histogram histogramVM.average = response.statistics.avg;
histogramVM.average = 34.5;
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binRange
binRange Numberreadonly
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The range of values for the histogram calculated from the bins. This is calculated by subtracting the min value of the first bin from the max value of the last bin.
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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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labelFormatFunction
labelFormatFunction LabelFormatter
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A function used to format labels. Overrides the default label formatter.
Example// For thumb values, rounds each label to whole numbers. slider.viewModel.labelFormatFunction = function(value) { return value.toFixed(0); }
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range
range Numberreadonly
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state
state Stringreadonly
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The current state of the view model.
Possible Values:"ready" |"disabled"
Method Overview
Name | Return Type | Summary | Class |
---|---|---|---|
Adds one or more handles which are to be tied to the lifecycle of the object. | Accessor | ||
Returns true if a named group of handles exist. | Accessor | ||
Removes a group of handles owned by the object. | Accessor |
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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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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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");