SizeSliderViewModel

Property Overview

Property Details

declaredClass Stringreadonly inherited

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

effectiveMax Number inherited

Since: ArcGIS Maps SDK for JavaScript 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.

effectiveMin Number inherited

Since: ArcGIS Maps SDK for JavaScript 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.

handlesSyncedToPrimary Boolean inherited

Only applicable when three thumbs (i.e. handles) are set on the slider (i.e. when primaryHandleEnabled is true). 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.viewModel.primaryHandleEnabled = true;
slider.viewModel.handlesSyncedToPrimary = true;

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.

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.

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 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

• 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;
}

labelFormatFunction LabelFormatter inherited

A function used to format labels. Overrides the default label formatter.

By default labels are formatted in the following way:

• When the data range is less than 10 ((max - min) < 10), labels are rounded based on the value set in the precision property.
• 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 precision.

Use this property to override the behavior defined above.

Example

// For thumb values, rounds each label to whole numbers.
// Note the actual value of the thumb continues to be stored
// based on the indicated data `precision` despite this formatting
sliderViewModel.labelFormatFunction = function(value, type) {
  return (type === "value") ? value.toFixed(0) : value;
}

labels String[]readonly inherited

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

persistSizeRangeEnabled Boolean

Since: ArcGIS Maps SDK for JavaScript 4.19

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

Example

slider.viewModel.persistSizeRangeEnabled = true;

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;

primaryHandleEnabled Boolean inherited

When true, the slider will render a third handle between the two handles already provided by default. This is the primary handle. Three or five stops must be defined for the primary handle to render. The primary handle represents the middle stop.

When handlesSyncedToPrimary is true, then this handle will control the position of the others when moved.

Default Value:false

See also

• handlesSyncedToPrimary

Example

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

state Stringreadonly inherited

The state of the view model.

Possible Values:"ready"|"disabled"

stops SizeStop[]

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

Example

sizeRendererCreator.createContinuousRenderer({
  layer: featureLayer,
  field: "fieldName",
  basemap: "gray-vector"
}).then(function(sizeResponse){
  const slider = new SizeSlider({
    viewModel: new SizeSliderVM({
      stops: sizeResponse.visualVariable.stops
    }),
    container: "sliderDiv"
  });
});

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;

values Number[]readonly inherited

The data values associated with the thumb locations of the slider. These are computed from the stops. Actual thumb locations depend on the number of stops provided.

See also

• setValue

zoomingEnabled Boolean inherited

Enables zooming on the slider. See zoomOptions for more information on zooming along the slider track.

See also

• zoomOptions

Example

// disables zooming on the slider
slider.viewModel.zoomingEnabled = false;

zoomOptions Object inherited

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.

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.

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.viewModel.zoomOptions = {
  min: 10,
  max: 25
};

// disables zooming on the slider
slider.viewModel.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.viewModel.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.viewModel.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.viewModel.set({ zoomOptions: { min: zoomMin, max: zoomMax } });
};

Method Overview

Method Details

addHandles(handleOrHandles, groupKey)inherited

Since: ArcGIS Maps SDK for JavaScript 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.

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

Type	Description
String	The 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

Type	Description
Number	The 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

Type	Description
String	The 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

Type	Description
Boolean	true if a listener was notified

getBounds(){Bounds}inherited

Since: ArcGIS Maps SDK for JavaScript 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.

Returns

Type	Description
Bounds	The effective bounds of the slider.

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

Type	Description
Object	Returns 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

Type	Description
String	Returns the formatted label.

getUnzoomedMax()inherited

Gets the max value of the slider. This is useful for when the user wants to change the slider max when it is not visible in the zoomed state.

See also

• zoomOptions

getUnzoomedMin()inherited

Gets the min value of the slider. This is useful for when the user wants to change the slider min when it is not visible in the zoomed state.

See also

• zoomOptions

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

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

hasHandles(groupKey){Boolean}inherited

Since: ArcGIS Maps SDK for JavaScript 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");
}

on(type, listener){Object}inherited

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);
});

removeHandles(groupKey)inherited

Since: ArcGIS Maps SDK for JavaScript 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");

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 Maps SDK 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

Type	Description
String	The input value rounded to the number of places specified in precision.

See also

• precision

Event Overview

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.