SizeSlider | API Reference | ArcGIS Maps SDK for JavaScript 4.31

The SizeSlider widget is intended for authoring and exploring data-driven visualizations in any layer that can be rendered with a SizeVariable. At a minimum you must set the min, max, and stops properties of the widget.

See the image below for a summary of the configurable options available on this slider.

SizeSlider with annotations

The fromRendererResult method can be used to conveniently create this slider from the result of the createContinuousRenderer method.

const sizeParams = {
  layer: layer,
  basemap: map.basemap,
  valueExpression: "( $feature.POP_POVERTY / $feature.TOTPOP_CY ) * 100",
  view: view
};

let rendererResult = null;

sizeRendererCreator
  .createContinuousRenderer(sizeParams)
  .then(function(response) {
    rendererResult = response;
    layer.renderer = response.renderer;

    return histogram({
      layer: layer,
      valueExpression: sizeParams.valueExpression,
      view: view,
      numBins: 70
    });
  })
   .then(function(histogramResult) {
     const sizeSlider = SizeSlider.fromRendererResult(rendererResult, histogramResult);
     sizeSlider.container = "slider";
   })
   .catch(function(error) {
     console.log("there was an error: ", error);
   });

This slider should be used to update a size visual variable in a layer's renderer. It is the responsibility of the app developer to set up event listeners on that update the size variable of the appropriate renderer.

// when the user slides the handle(s), update the renderer
// with the updated size stops

sizeSlider.on(["thumb-change", "thumb-drag"], function() {
  const renderer = layer.renderer.clone();
  const sizeVariable = renderer.visualVariables[0];
  renderer.visualVariables = [ sizeSlider.updateVisualVariable(sizeVariable) ];
  layer.renderer = renderer;
});

See also

Constructors

SizeSlider Constructor new SizeSlider(properties)

Parameter

properties Object

optional

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

Example

// Typical usage
const slider = new SizeSlider({
  container: "sliderDiv",
  min: 0,
  max: 100,
  stops: [
    { value: 0, size: 4 },
    { value: 100, size: 40 }
  ]
});

Property Overview

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

Show inherited properties

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Type	Summary	Class
String\|HTMLElement	The ID or node representing the DOM element containing the widget.	Widget
String	The name of the class.	Accessor
Boolean	Only applicable when three thumbs (i.e.	SizeSlider
HistogramConfig	The Histogram associated with the data represented on the slider.	SmartMappingSliderBase
String	The unique ID assigned to the widget when the widget is created.	Widget
LabelFormatter	A function used to format user inputs.	SmartMappingSliderBase
InputParser	Function used to parse slider inputs formatted by the inputFormatFunction.	SmartMappingSliderBase
String	The widget's default label.	SizeSlider
LabelFormatter	A modified version of Slider.labelFormatFunction, which is a custom function used to format labels on the thumbs, min, max, and average values.	SmartMappingSliderBase
Number	The maximum value or upper bound of the slider.	SmartMappingSliderBase
Number	The minimum value or lower bound of the slider.	SmartMappingSliderBase
Boolean	Only applicable when three thumbs (i.e.	SizeSlider
Number	Defines how slider thumb values should be rounded.	SmartMappingSliderBase
Boolean	When `true`, the slider will render a third handle between the two handles already provided by default.	SizeSlider
String	The state of the view model.	SmartMappingSliderBase
SizeStop []	The size stops from the SizeVariable to link to the slider.	SizeSlider
Object	Exposes various properties of the widget that can be styled.	SizeSlider
Boolean	When `true`, all segments will sync together in updating thumb values when the user drags any segment.	SmartMappingSliderBase
SizeSliderViewModel	The view model for the SizeSlider widget.	SizeSlider
Boolean	Indicates whether the widget is visible.	Widget
Object	The visible elements that are displayed within the widget.	SmartMappingSliderBase
Object	Zooms the slider track to the bounds provided in this property.	SmartMappingSliderBase

Property Details

container Inherited Property container String |HTMLElement Inherited from Widget

The ID or node representing the DOM element containing the widget. This property can only be set once. The following examples are all valid use case when working with widgets.

Examples

// Create the HTML div element programmatically at runtime and set to the widget's container
const basemapGallery = new BasemapGallery({
  view: view,
  container: document.createElement("div")
});

// Add the widget to the top-right corner of the view
view.ui.add(basemapGallery, {
  position: "top-right"
});

// Specify an already-defined HTML div element in the widget's container

const basemapGallery = new BasemapGallery({
  view: view,
  container: basemapGalleryDiv
});

// Add the widget to the top-right corner of the view
view.ui.add(basemapGallery, {
  position: "top-right"
});

// HTML markup
<body>
  <div id="viewDiv"></div>
  <div id="basemapGalleryDiv"></div>
</body>

// Specify the widget while adding to the view's UI
const basemapGallery = new BasemapGallery({
  view: view
});

// Add the widget to the top-right corner of the view
view.ui.add(basemapGallery, {
  position: "top-right"
});

declaredClass Inherited Property declaredClass Stringreadonly Inherited from Accessor

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

handlesSyncedToPrimary Property handlesSyncedToPrimary Boolean Since: ArcGIS Maps SDK for JavaScript 4.18 SizeSlider since 4.12, handlesSyncedToPrimary added at 4.18.

Only applicable when three thumbs (i.e. handles) are set on the slider values. This property indicates whether the position of the outside handles are synced with the middle, or primary, handle. When enabled, if the primary handle is moved then the outside handle positions are updated while maintaining a fixed distance from the primary handle.

Only applicable when primaryHandleEnabled is true.

Default Value:true

See also

primaryHandleEnabled

Example

// enables the primary handles and syncs it with the others
slider.primaryHandleEnabled = true;
slider.handlesSyncedToPrimary = true;

histogramConfig Inherited Property histogramConfig HistogramConfig Inherited from SmartMappingSliderBase

The Histogram associated with the data represented on the slider. The bins are typically generated using the histogram statistics function.

See also

Example

histogram({
  layer: featureLayer,
  field: "fieldName",
  numBins: 30
}).then(function(histogramResult){
  // set the histogram to the slider
  slider.histogramConfig = {
    bins: histogramResult.bins
  };
});

id Inherited Property id String Inherited from Widget

The unique ID assigned to the widget when the widget is created. If not set by the developer, it will default to the container ID, or if that is not present then it will be automatically generated.

inputFormatFunction Inherited Property inputFormatFunction LabelFormatter Inherited from SmartMappingSliderBase Since: ArcGIS Maps SDK for JavaScript 4.14 SmartMappingSliderBase since 4.12, inputFormatFunction added at 4.14.

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

inputParseFunction

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 Inherited Property inputParseFunction InputParser Inherited from SmartMappingSliderBase Since: ArcGIS Maps SDK for JavaScript 4.14 SmartMappingSliderBase since 4.12, inputParseFunction added at 4.14.

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

inputFormatFunction

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;
}

label Property label String

The widget's default label. This label displays when it is used within another widget, such as the Expand or LayerList widgets.

labelFormatFunction Inherited Property labelFormatFunction LabelFormatter Inherited from SmartMappingSliderBase

A modified version of Slider.labelFormatFunction, which is a custom function used to format labels on the thumbs, min, max, and average values. Overrides the default label formatter. This function also supports date formatting.

Example

// For thumb values, rounds each label to whole numbers
slider.labelFormatFunction = function(value, type) {
  return (type === "value-change") ? value.toFixed(0): value;
}

max Inherited Property max Number Inherited from SmartMappingSliderBase

The maximum value or upper bound of the slider. If the largest slider value in the constructor is greater than the max set in this property, then the max will update to match the largest slider value.

Example

slider.max = 150;

min Inherited Property min Number Inherited from SmartMappingSliderBase

The minimum value or lower bound of the slider. If the smallest slider value in the constructor is greater than the min set in this property, then the min will update to match the smallest slider value.

Example

slider.min = -150;

persistSizeRangeEnabled Property persistSizeRangeEnabled Boolean Since: ArcGIS Maps SDK for JavaScript 4.19 SizeSlider since 4.12, persistSizeRangeEnabled added at 4.19.

Only applicable when three thumbs (i.e. handles) are set on the slider (i.e. when primaryHandleEnabled is true). This property is typically used in diverging, or above-and-below renderer configurations.

When true, ensures symbol sizes in the above range are consistent with symbol sizes in the below range for all slider thumb positions. In other words, the size values in the stops will adjust proportionally according to the positions of the data values within the constraints of the size range (maxSize - minSize) as the slider thumbs update. When false, size values in the stops will remain the same even when slider thumb values change.

In most cases, this should be set to true to keep sizes in the above range consistent with sizes in the below range to avoid map misinterpretation.

Default Value:false

See also

primaryHandleEnabled

Example

slider.primaryHandleEnabled = true;
slider.persistSizeRangeEnabled = true;

precision Inherited Property precision Number Inherited from SmartMappingSliderBase Since: ArcGIS Maps SDK for JavaScript 4.14 SmartMappingSliderBase since 4.12, precision added at 4.14.

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

This value also indicates the precision of thumb labels when the data range is less than 10 (i.e. (max - min) < 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 labels of the thumbs will display two decimal places, but the precision of the actual thumb values will not be lost even when the user slides or moves the thumb.

const slider = new Slider({
  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
  container: "sliderDiv"
});

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

slider.precision = 7;

primaryHandleEnabled Property primaryHandleEnabled Boolean Since: ArcGIS Maps SDK for JavaScript 4.18 SizeSlider since 4.12, primaryHandleEnabled added at 4.18.

When true, the slider will render a third handle between the two handles already provided by default. This is the primary handle. When handlesSyncedToPrimary is true, then this handle will control the position of the others when moved.

Default Value:false

See also

handlesSyncedToPrimary
persistSizeRangeEnabled

Example

// enables the primary handles and syncs it with the others
slider.primaryHandleEnabled = true;
slider.handlesSyncedToPrimary = true;
slider.persistSizeRangeEnabled = true;

state Inherited Property state Stringreadonly Inherited from SmartMappingSliderBase

The state of the view model.

Possible Values:"ready" |"disabled"

stops Property stops SizeStop[]

The size stops from the SizeVariable to link to the slider.

See also

updateVisualVariable()

Example

const slider = new SizeSlider({
  container: "sliderDiv",
  min: 0,
  max: 100,
  stops: [
    { value: 0, size: 4 },
    { value: 100, size: 40 }
  ]
});

style Property style Object

Exposes various properties of the widget that can be styled.

Properties: trackFillColor Color

optional
Default Value:new Color([149, 149, 149])

The color of the slider's track. For single-color visualizations where only a Size variable is present, you should set this color to match the color of the symbol in the SimpleRenderer.

trackBackgroundColor Color

optional
Default Value:new Color([224, 224, 224])

The background color of the slider's track. Generally, this color should be subdued and not interfere with the trackFillColor.

Example

slider.style = {
  trackFillColor: new Color("dodgerblue"),
  trackBackgroundColor: new Color([50,50,50])
};

syncedSegmentsEnabled Inherited Property syncedSegmentsEnabled Boolean Inherited from SmartMappingSliderBase Since: ArcGIS Maps SDK for JavaScript 4.20 SmartMappingSliderBase since 4.12, syncedSegmentsEnabled added at 4.20.

When true, all segments will sync together in updating thumb values when the user drags any segment. This maintains the interval between all thumbs when any segment is dragged. Only applicable when visibleElements.interactiveTrack is true.

In sliders where the primary handle is enabled, this allows you to disable handlesSyncedToPrimary to keep handle movements independent of the middle (primary) handle, but still provide an option for the end user to sync handles with the primary handle via slider drag events.

Default Value:false

See also

visibleElements
handlesSyncedToPrimary

Example

slider.visibleElements = {
  interactiveTrack: true
};
slider.primaryHandleEnabled = true;
slider.handlesSyncedToPrimary = false;
slider.syncedSegmentsEnabled = true;

viewModel Property viewModel SizeSliderViewModel

The view model for the SizeSlider widget. This class contains all the logic (properties and methods) that controls this widget's behavior. See the SizeSliderViewModel class to access all properties and methods on the SizeSlider widget.

visible Inherited Property visible Boolean Inherited from Widget

Indicates whether the widget is visible.

If false, the widget will no longer be rendered in the web document. This may affect the layout of other elements or widgets in the document. For example, if this widget is the first of three widgets associated to the upper right hand corner of the view UI, then the other widgets will reposition when this widget is made invisible. For more information, refer to the css display value of "none".

Default Value:true

Example

// Hides the widget in the view
widget.visible = false;

visibleElements Inherited Property visibleElements Object Inherited from SmartMappingSliderBase Since: ArcGIS Maps SDK for JavaScript 4.20 SmartMappingSliderBase since 4.12, visibleElements added at 4.20.

The visible elements that are displayed within the widget. This property provides the ability to turn individual elements of the widget's display on/off.

Property

interactiveTrack Boolean

optional

Default Value:false

When true, displays interactive segments on the track that maintain the interval between two slider thumbs/handles.

See also

syncedSegmentsEnabled
segment-drag event

Example

slider.visibleElements = {
  interactiveTrack: true
};
slider.syncedSegmentsEnabled = true;

zoomOptions Inherited Property zoomOptions Object Inherited from SmartMappingSliderBase

Zooms the slider track to the bounds provided in this property. When min and/or max zoom values are provided, the absolute min and max slider values are preserved and rendered at their typical positions on the slider. However, the slider track itself is zoomed so that thumbs cannot be moved above or below the provided min and max zoomed values.

When a slider is in a zoomed state, the zoomed ends of the track will appear jagged. In the image below, notice how the top thumb cannot be moved past the zoom max of 31 even though the slider max is 200.

slider-zoom

To exit a zoomed state, the user can click the jagged line or the developer can set the zoomOptions to null. It is up to the developer to provide a UI option for end users to enable zooming on the slider.

Setting the zoomOptions is useful when the slider is tied to heavily skewed datasets where the histogram renders only one or two bars because of outliers.

slider-not-zoomed

You can remove the influence of outliers by zooming the slider and regenerating a histogram based on the zoomed min and max. This will provide a better view of the data and make the slider more useful to the end user.

Properties: min Number

optional
The lower bound of the zoom.

max Number

optional
The upper bound of the zoom.

Examples

// zooms the slider to so thumbs can only be moved
// to positions between the values of 10 and 25 while
// maintaining the slider's absolute minimum and
// maximum values
slider.zoomOptions = {
  min: 10,
  max: 25
};

// disables zooming on the slider
slider.zoomOptions = null;

// zooms the slider to so thumbs can only be moved
// to positions above the value of 10, while maintaining
// the slider's absolute minimum value
slider.zoomOptions = {
  min: 10
};

// zooms the slider to so thumbs can only be moved
// to positions below the value of 25, while maintaining
// the slider's absolute maximum value
slider.zoomOptions = {
  max: 25
};

// zooms the slider to the handle positions
// with some padding
document.getElementById("zoomInButton").onclick = function() {
  const lowerThumb = slider.values[0];
  const upperThumb = slider.values[1];

  const range = upperThumb - lowerThumb;
  const padding = range * 0.3;

  const zoomMin = (lowerThumb - padding) > slider.min ? (lowerThumb - padding) : slider.min;
  const zoomMax = (upperThumb + padding) < slider.max ? (upperThumb + padding) : slider.max;

  slider.set({ zoomOptions: { min: zoomMin, max: zoomMax } });
};

Method Overview

Show inherited methods

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Return Type	Summary	Class
	Adds one or more handles which are to be tied to the lifecycle of the object.	Accessor
String	A utility method used for building the value for a widget's `class` property.	Widget
	Destroys the widget instance.	Widget
Boolean	Emits an event on the instance.	Widget
SizeSlider	A convenience function used to create a SizeSlider widget instance from the result of the createContinuousRenderer method.	SizeSlider
Boolean	Indicates whether there is an event listener on the instance that matches the provided event name.	Widget
Boolean	Returns true if a named group of handles exist.	Accessor
Boolean	`isFulfilled()` may be used to verify if creating an instance of the class is fulfilled (either resolved or rejected).	Widget
Boolean	`isRejected()` may be used to verify if creating an instance of the class is rejected.	Widget
Boolean	`isResolved()` may be used to verify if creating an instance of the class is resolved.	Widget
Object	Registers an event handler on the instance.	Widget
	Adds one or more handles which are to be tied to the lifecycle of the widget.	Widget
	Executes after widget is ready for rendering.	Widget
	Removes a group of handles owned by the object.	Accessor
Object	This method is implemented by subclasses for rendering.	Widget
	Renders widget to the DOM immediately.	Widget
	Schedules widget rendering.	Widget
	A convenience function used to update the properties of a SizeSlider widget instance from the result of the createContinuousRenderer method.	SizeSlider
SizeVariable	A convenience function used to update the SizeVariable to match the values of the stops on the slider.	SizeSlider
Promise	`when()` may be leveraged once an instance of the class is created.	Widget

Method Details

addHandles Inherited Method addHandles(handleOrHandles, groupKey) Inherited from Accessor Since: ArcGIS Maps SDK for JavaScript 4.25 Accessor 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();

Parameters

handleOrHandles WatchHandle|WatchHandle []

Handles marked for removal once the object is destroyed.

groupKey *

optional

Key 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.

classes Inherited Method classes(classNames){String} Inherited from Widget

A utility method used for building the value for a widget's class property. This aids in simplifying css class setup.

Parameter

classNames String|String []|Object

repeatable

The class names.

Returns

Type	Description
String	The computed class name.

Example

// .tsx syntax showing how to set css classes while rendering the widget

render() {
  const dynamicClasses = {
    [css.flip]: this.flip,
    [css.primary]: this.primary
  };

  return (
    <div class={classes(css.root, css.mixin, dynamicClasses)} />
  );
}

destroy Inherited Method destroy() Inherited from Widget

Destroys the widget instance.

emit Inherited Method emit(type, event){Boolean} Inherited from Widget

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

Type	Description
Boolean	`true` if a listener was notified

fromRendererResult Method fromRendererResult(rendererResult, histogramResult){SizeSlider}static

A convenience function used to create a SizeSlider widget instance from the result of the createContinuousRenderer method.

This method sets the slider stops, min, max, and histogramConfig. It is still the developer's responsibility to assign it a proper container and any other optional properties.

Parameters

rendererResult ContinuousRendererResult

The result object from the createContinuousRenderer method.

histogramResult HistogramResult

optional

The result histogram object from the histogram method.

Returns

Type	Description
SizeSlider	Returns a SizeSlider instance. This will not render until you assign it a valid container.

Example

const params = {
  layer: layer,
  basemap: map.basemap,
  field: "POP_POVERTY"
};

let rendererResult = null;

sizeRendererCreator
  .createContinuousRenderer(colorParams)
  .then(function(response) {
    rendererResult = response;
    layer.renderer = response.renderer;

    return histogram({
      layer: layer,
      valueExpression: params.field,
      numBins: 30
    });
  })
   .then(function(histogramResult) {

     const sizeSlider = SizeSlider.fromRendererResult(rendererResult, histogramResult);
     sizeSlider.container = "slider";

     // when the user slides the handle(s), update the renderer
     // with the updated size properties

     sizeSlider.on(["thumb-change", "thumb-drag"], function() {
       const renderer = layer.renderer.clone();
       const sizeVariable = renderer.visualVariables[0];
       renderer.visualVariables = [ sizeSlider.updateVisualVariable( sizeVariable ) ];
       layer.renderer = renderer;
     });
   })
   .catch(function(error) {
     console.log("there was an error: ", error);
   });

hasEventListener Inherited Method hasEventListener(type){Boolean} Inherited from Widget

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

Type	Description
Boolean	Returns true if the class supports the input event.

hasHandles Inherited Method hasHandles(groupKey){Boolean} Inherited from Accessor Since: ArcGIS Maps SDK for JavaScript 4.25 Accessor since 4.0, hasHandles added at 4.25.

Returns true if a named group of handles exist.

Parameter

groupKey *

optional

A group key.

Returns

Type	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");
}

isFulfilled Inherited Method isFulfilled(){Boolean} Inherited from Widget Since: ArcGIS Maps SDK for JavaScript 4.19 Widget since 4.2, isFulfilled added at 4.19.

isFulfilled() may be used to verify if creating an instance of the class is fulfilled (either resolved or rejected). If it is fulfilled, true will be returned.

Returns

Type	Description
Boolean	Indicates whether creating an instance of the class has been fulfilled (either resolved or rejected).

isRejected Inherited Method isRejected(){Boolean} Inherited from Widget Since: ArcGIS Maps SDK for JavaScript 4.19 Widget since 4.2, isRejected added at 4.19.

isRejected() may be used to verify if creating an instance of the class is rejected. If it is rejected, true will be returned.

Returns

Type	Description
Boolean	Indicates whether creating an instance of the class has been rejected.

isResolved Inherited Method isResolved(){Boolean} Inherited from Widget Since: ArcGIS Maps SDK for JavaScript 4.19 Widget since 4.2, isResolved added at 4.19.

isResolved() may be used to verify if creating an instance of the class is resolved. If it is resolved, true will be returned.

Returns

Type	Description
Boolean	Indicates whether creating an instance of the class has been resolved.

on Inherited Method on(type, listener){Object} Inherited from Widget

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

Parameters

type String|String []

An event or an array of events to listen for.

listener Function

The function to call when the event fires.

Returns

Type 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.

Example

view.on("click", function(event){
  // event is the event handle returned after the event fires.
  console.log(event.mapPoint);
});

own Inherited Method own(handleOrHandles) Inherited from Widget Since: ArcGIS Maps SDK for JavaScript 4.24 Widget since 4.2, own added at 4.24. Deprecated since 4.28 Use addHandles() instead.

Adds one or more handles which are to be tied to the lifecycle of the widget. The handles will be removed when the widget is destroyed.

const handle = reactiveUtils.when(
  () => !view.updating,
  () => {
    wkidSelect.disabled = false;
  },
  { once: true}
);

this.own(handle); // Handle gets removed when the widget is destroyed.

Parameter

handleOrHandles WatchHandle|WatchHandle []

Handles marked for removal once the widget is destroyed.

postInitialize Inherited Method postInitialize() Inherited from Widget

Executes after widget is ready for rendering.

removeHandles Inherited Method removeHandles(groupKey) Inherited from Accessor Since: ArcGIS Maps SDK for JavaScript 4.25 Accessor since 4.0, removeHandles added at 4.25.

Removes a group of handles owned by the object.

Parameter

groupKey *

optional

A group key or an array or collection of group keys to remove.

Example

obj.removeHandles(); // removes handles from default group

obj.removeHandles("handle-group");
obj.removeHandles("other-handle-group");

render Inherited Method render(){Object} Inherited from Widget

This method is implemented by subclasses for rendering.

Returns

Type	Description
Object	The rendered virtual node.

renderNow Inherited Method renderNow() Inherited from Widget

Renders widget to the DOM immediately.

scheduleRender Inherited Method scheduleRender() Inherited from Widget

Schedules widget rendering. This method is useful for changes affecting the UI.

updateFromRendererResult Method updateFromRendererResult(rendererResult, histogramResult)

A convenience function used to update the properties of a SizeSlider widget instance from the result of the createContinuousRenderer method. This method is useful for cases when the app allows the end user to switch data variables used to render the data.

Parameters

rendererResult ContinuousRendererResult

The result object from the createContinuousRenderer method.

histogramResult HistogramResult

optional

The result histogram object from the histogram method.

Example

const params = {
  layer: layer,
  basemap: map.basemap,
  field: "POP_POVERTY"
};

let rendererResult = null;

sizeRendererCreator
  .createContinuousRenderer(colorParams)
  .then(function(response) {
    rendererResult = response;
    layer.renderer = response.renderer;

    return histogram({
      layer: layer,
      valueExpression: params.field,
      numBins: 30
    });
  })
   .then(function(histogramResult) {
     sizeSlider.updateFromRendererResult(rendererResult, histogramResult);
   })
   .catch(function(error) {
     console.log("there was an error: ", error);
   });

updateVisualVariable Method updateVisualVariable(sizeVariable){SizeVariable}

A convenience function used to update the SizeVariable to match the values of the stops on the slider.

This is particularly useful for Size visual variables that have a set minDataValue and maxDataValue. This method will properly reconstruct the variable to set on the renderer so it matches the stops on the slider.

Parameter

sizeVariable SizeVariable

The size visual variable from the renderer to update to the set stops on the slider.

Returns

Type	Description
SizeVariable	Returns the updated visual variable to set back on the renderer.

Example

sizeSlider.on(["thumb-change", "thumb-drag"], function() {
  const renderer = layer.renderer.clone();
  const sizeVariable = renderer.visualVariables[0];
  renderer.visualVariables = [ sizeSlider.updateVisualVariable( sizeVariable ) ];
  layer.renderer = renderer;
});

when Inherited Method when(callback, errback){Promise} Inherited from Widget Since: ArcGIS Maps SDK for JavaScript 4.19 Widget since 4.2, when added at 4.19.

when() may be leveraged once an instance of the class is created. This method takes two input parameters: a callback function and an errback function. The callback executes when the instance of the class loads. The errback executes if the instance of the class fails to load.

Parameters

callback Function

optional

The function to call when the promise resolves.

errback Function

optional

The function to execute when the promise fails.

Returns

Type	Description
Promise	Returns a new Promise for the result of `callback`.

Example

// Although this example uses the BasemapGallery widget, any class instance that is a promise may use when() in the same way
let bmGallery = new BasemapGallery();
bmGallery.when(function(){
  // This function will execute once the promise is resolved
}, function(error){
  // This function will execute if the promise is rejected due to an error
});

Event Overview

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Type	Summary	Class
{oldValue: Number,type: "max-change",value: Number}	Fires when a user changes the max of the slider.	SmartMappingSliderBase
{oldValue: Number,type: "min-change",value: Number}	Fires when a user changes the min of the slider.	SmartMappingSliderBase
{index: Number,state: "start"\|"drag",type: "segment-drag",thumbIndices: Number []}	Fires when a user drags a segment of the slider.	SmartMappingSliderBase
{index: Number,oldValue: Number,type: "thumb-change",value: Number}	Fires when a user changes the value of a thumb via arrow keys and keyboard editing of the label on the widget.	SmartMappingSliderBase
{index: Number,state: "start"\|"drag",type: "thumb-drag",value: Number}	Fires when a user drags a thumb on the widget.	SmartMappingSliderBase

Event Details

max-change Inherited Event max-change Inherited from SmartMappingSliderBase

Fires when a user changes the max of the slider.

Properties: oldValue Number

The former max (or bound) of the slider.

type String

The type of the event.

The value is always "max-change".

value Number

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

Example

slider.on("max-change", function() {
  const renderer = layer.renderer.clone();
  const visualVariable = renderer.visualVariables[0].clone();
  colorVariable.stops = slider.stops;
  renderer.visualVariables = [ visualVariable ];
  layer.renderer = renderer;
});

min-change Inherited Event min-change Inherited from SmartMappingSliderBase

Fires when a user changes the min 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-change".

value Number

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

Example

slider.on("min-change", function() {
  const renderer = layer.renderer.clone();
  const visualVariable = renderer.visualVariables[0].clone();
  colorVariable.stops = slider.stops;
  renderer.visualVariables = [ visualVariable ];
  layer.renderer = renderer;
});

segment-drag Inherited Event segment-drag Inherited from SmartMappingSliderBase Since: ArcGIS Maps SDK for JavaScript 4.20 SmartMappingSliderBase since 4.12, segment-drag added at 4.20.

Fires when a user drags a segment of the slider. A segment is the portion of the track that lies between two thumbs. This is only applicable when visibleElements.interactiveTrack is true.

Properties

index Number

The 1-based index of the segment in the slider.

state String

The state of the drag.

Possible Values:"start"|"drag"

type String

The type of the event.

The value is always "segment-drag".

thumbIndices Number []

The indices of the thumbs on each end of the segment.

See also

visibleElements

Example

slider.on("segment-drag", () => {
  const renderer = layer.renderer.clone();
  const visualVariable = renderer.visualVariables[0].clone();
  colorVariable.stops = slider.stops;
  renderer.visualVariables = [ visualVariable ];
  layer.renderer = renderer;
});

thumb-change Inherited Event thumb-change Inherited from SmartMappingSliderBase

Fires when a user changes the value of a thumb via arrow keys and keyboard editing of the label on the widget.

Properties: index Number

The 0-based index of the thumb emitting the event.

oldValue Number

The former value of the thumb before the change was made.

type String

The type of the event.

The value is always "thumb-change".

value Number

The value of the thumb when the event is emitted.

Example

slider.on("thumb-change", function() {
  const renderer = layer.renderer.clone();
  const visualVariable = renderer.visualVariables[0].clone();
  colorVariable.stops = slider.stops;
  renderer.visualVariables = [ visualVariable ];
  layer.renderer = renderer;
});

thumb-drag Inherited Event thumb-drag Inherited from SmartMappingSliderBase

Fires when a user drags a thumb on the widget.

Properties: index Number

The 0-based index of the thumb emitting the event.

state String

The state of the drag.

Possible Values:"start"|"drag"

type String

The type of the event.

The value is always "thumb-drag".

value Number

The value of the thumb when the event is emitted.

Example

slider.on("thumb-drag", function() {
  const renderer = layer.renderer.clone();
  const visualVariable = renderer.visualVariables[0].clone();
  colorVariable.stops = slider.stops;
  renderer.visualVariables = [ visualVariable ];
  layer.renderer = renderer;
});