Daylight | API Reference | ArcGIS Maps SDK for JavaScript 4.31

The Daylight widget can be used to manipulate the lighting conditions of a SceneView. For this, the widget modifies the lighting property of SceneView.environment. To illuminate the scene, one can either use a configuration of date and time to position the sun or switch to the virtual mode, where the light source is relative to the camera.

When lighting the scene with the sun and adjusting the time and date, the position of the sun and the stars get updated accordingly, changing the light and the shadows in the scene. This sets the date and directShadowsEnabled properties of SceneView.environment.lighting.

The daytime slider has an option to select the timezone. When the user makes any adjustments here, a new time in the chosen timezone is calculated and displayed in the slider. The timezone selector can be disabled by setting timezone to false in the visibleElements property.

By default a calendar is displayed where the user can select the day, month and year. With the dateOrSeason property, the calendar can be replaced with a dropdown menu where a season can be selected instead:

const daylight = new Daylight({
  view: view,
  dateOrSeason: "season"
});

daylight-seasons

There are two play buttons, one corresponds to the daytime slider and it animates the time as it cycles through the minutes of the day. The second button corresponds to the date picker and it animates the time as it cycles through the months of the year. The speed of the animation can be set using the playSpeedMultiplier property.

const daylight = new Daylight({
  view: view,
  playSpeedMultiplier: 2
});

daylight-animation

Except for the daytime slider, all the elements in the daylight widget can be hidden by using the visibleElements property:

const daylight = new Daylight({
  view: view,
  visibleElements: {
    timezone: false,
    datePicker: false,
    playButtons: false,
    sunLightingToggle: false,
    shadowsToggle: false
  }
});

With these settings, the widget looks like this:

daylight-no-elements

Whenever the sun position option is unchecked, the scene applies the virtual light source relative to the camera. With this, the widget’s time slider and date picker get automatically disabled:

daylight-virtual

Known limitations:

The Daylight widget uses UTC time and does not account for the daylight savings times in different countries and regions of the world.
When the SceneView.environment.lighting is of the type virtual, setting the time and date does not have an influence on the lighting conditions of the scene.

See also

Example

// basic usage of the daylight widget using the default settings
const daylight = new Daylight({
  view: view
});
view.ui.add(daylight, "top-right");

Constructors

Daylight Constructor new Daylight(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 daylightWidget = new Daylight({
  view: view
});

view.ui.add(daylightWidget, "top-right");

Property Overview

Any properties can be set, retrieved or listened to. See the Watch for changes 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	Controls whether the widget displays a date or a season picker.	Daylight
String	The name of the class.	Accessor
Number	Indicates the heading level to use for the widget title.	Daylight
String	Icon which represents the widget.	Daylight
String	The unique ID assigned to the widget when the widget is created.	Widget
String	The widget's default label.	Daylight
Number	Controls the speed of the daytime and date animation.	Daylight
Number\|Number []	Sets steps, or intervals, on the time slider to restrict the times of the day that can be selected when dragging the thumb.	Daylight
SceneView	A reference to the SceneView.	Daylight
DaylightViewModel	The view model for the Daylight widget.	Daylight
Boolean	Indicates whether the widget is visible.	Widget
VisibleElements	This property provides the ability to display or hide the individual elements of the widget.	Daylight

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"
});

dateOrSeason Property dateOrSeason String

Controls whether the widget displays a date or a season picker. When the date picker is set, the user selects the date from a calendar. The season picker allows the user to choose a season from a drop-down list. Each season uses a fixed date corresponding to the equinoxes and solstices of 2014.

Possible Values:"season" |"date"

Default Value:"date"

Example

// set the season picker
daylightWidget.dateOrSeason = "season";

declaredClass Inherited Property declaredClass Stringreadonly Inherited from Accessor

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

headingLevel Property headingLevel Number Since: ArcGIS Maps SDK for JavaScript 4.20 Daylight since 4.14, headingLevel added at 4.20.

Indicates the heading level to use for the widget title. By default, the title is rendered as a level 3 heading (e.g. <h3>Daylight</h3>). Depending on the widget's placement in your app, you may need to adjust this heading for proper semantics. This is important for meeting accessibility standards.

Default Value:3

See also

Heading Elements

Example

daylight.headingLevel = 2;

icon Property icon String Since: ArcGIS Maps SDK for JavaScript 4.27 Daylight since 4.14, icon added at 4.27.

Icon which represents the widget. It is typically used when the widget is controlled by another one (e.g. in the Expand widget).

Default Value:"brightness"

See also

Calcite Icon Search

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.

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.

playSpeedMultiplier Property playSpeedMultiplier Number

Controls the speed of the daytime and date animation.

Default Value:1.0

Example

// Plays the daylight animation at half of the default speed
daylightWidget.playSpeedMultiplier = 0.5;

timeSliderSteps Property timeSliderSteps Number |Number[] Since: ArcGIS Maps SDK for JavaScript 4.16 Daylight since 4.14, timeSliderSteps added at 4.16.

Sets steps, or intervals, on the time slider to restrict the times of the day that can be selected when dragging the thumb. All values are in minutes, where 0 is midnight and 23 * 60 + 59 is just before midnight the following day.

If an array of numbers is passed to this property, the slider thumbs may only be moved to the times specified in the array.

If a single number is set, then steps are set for the entire day at an interval of timeSliderSteps minutes. For example, if a value of 60 is set here, dragging the slider will allow selecting each of 24 hours of the day.

Default Value:5

Examples

// set steps at an interval of 60. So the
// slider thumb snaps at each hour of the day.
daylightWidget.timeSliderSteps = 60;

// Set steps at specific times.
daylightWidget.timeSliderSteps = [60, 100, 120, 160];

view Property view SceneView

A reference to the SceneView. Set this to link the widget to a specific view.

viewModel Property viewModel DaylightViewModelautocast

The view model for the Daylight widget. This is a class that contains all the logic (properties and methods) that controls this widget's behavior. See the DaylightViewModel class.

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 Property visibleElements VisibleElementsautocast

This property provides the ability to display or hide the individual elements of the widget. Play buttons, sun lighting toggle, shadow toggle button, date picker, and timezone selector can be displayed or hidden by setting their corresponding properties to true or false. By default, all the elements are displayed.

Example

// display all elements, except the shadow toggle button
daylightWidget.visibleElements.shadowsToggle = false;

// disable all elements
daylightWidget.visibleElements = {
  header: false,
  playButtons: false,
  datePicker: false,
  timezone: false,
  sunLightingToggle: false,
  shadowsToggle: false
};

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
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
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

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.

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
});

Type Definitions

VisibleElements Type Definition VisibleElements

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

Properties: header Boolean

optional
Default Value:true

When set to false, the header is not displayed.

playButtons Boolean

optional
Default Value:true

When set to false, neither of the play buttons are displayed.

datePicker Boolean

optional
Default Value:true

When set to false, neither the date nor the season picker are displayed.

timezone Boolean

optional
Default Value:true

When set to false, the timezone selector is not displayed.

sunLightingToggle Boolean

optional
Default Value:true

When set to false, the sun lighting checkbox is not displayed.

shadowsToggle Boolean

optional
Default Value:true

When set to false, the shadows checkbox is not displayed.