Daylight

The daylight widget can be used to manipulate the time and date and to toggle shadows in a SceneView. When changing the time and date, the position of the sun and the stars gets updated accordingly, changing the lighting and the shadows in the scene. This widget modifies the date and directShadowsEnabled properties of SceneView.environment.lighting.

The daytime slider has an option to select the timezone. When the user changes the timezone, a new time in that 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:

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,
    shadowsToggle: false
  }
});

With these settings, the widget looks like this:

daylight-no-elements

For information about gaining full control of widget styles, see the Styling topic.

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

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 Working with Properties topic.

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Type	Summary	Class
String\|HTMLElement	The ID or node representing the DOM element containing the widget. more details	more details	Widget
String	Controls whether the widget displays a date or a season picker. more details	more details	Daylight
String	The name of the class. more details	more details	Accessor
String	The unique ID assigned to the widget when the widget is created. more details	more details	Widget
String	The widget's label. more details	more details	Widget
Number	Controls the speed of the daytime and date animation. more details	more details	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. more details	more details	Daylight
SceneView	A reference to the SceneView. more details	more details	Daylight
DaylightViewModel	The view model for the Daylight widget. more details	more details	Daylight
VisibleElements	This property provides the ability to display or hide the individual elements of the widget. more details	more details	Daylight

Property Details

container String|HTMLElement inherited

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 cases 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 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 Stringreadonly inherited

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

id String inherited

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 String inherited

The widget's label.

This property is useful whenever the widget is controlled by another one (e.g. Expand)

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 Number|Number [] Since: ArcGIS API for JavaScript 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 SceneView

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

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.

visibleElements VisibleElementsautocast

This property provides the ability to display or hide the individual elements of the widget. Play buttons, 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 = {
  playButtons: false,
  shadowsToggle: false,
  datePicker: false,
  timezone: false
};

Method Overview

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Return Type	Summary	Class
String	A utility method used for building the value for a widget's `class` property. more details	more details	Widget
	Destroys the widget instance. more details	more details	Widget
Boolean	Emits an event on the instance. more details	more details	Widget
Boolean	Indicates whether there is an event listener on the instance that matches the provided event name. more details	more details	Widget
Object	Registers an event handler on the instance. more details	more details	Widget
	Widget teardown helper. more details	more details	Widget
	This method is primarily used by developers when implementing custom widgets. more details	more details	Widget
Object	This method is primarily used by developers when implementing custom widgets. more details	more details	Widget
	Renders widget to the DOM immediately. more details	more details	Widget
	This method is primarily used by developers when implementing custom widgets. more details	more details	Widget

Method Details

classes(classNames){String}inherited

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.

See also:

Guide - Widget development (rendering)

Example:

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

render() {
  const dynamicIconClasses = {
    [CSS.myIcon]: this.showIcon,
    [CSS.greyIcon]: !this.showIcon
  };

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

destroy()inherited

Destroys the widget instance.

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

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.

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 []

A event type, or an array of event types, to listen for.

listener Function

The function to call when the event is fired.

Returns:

Type Description

Object

Returns an event handler with a remove() method that can 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(handles)inherited

Widget teardown helper. Any handles added to it will be automatically removed when the widget is destroyed.

Parameter:

handles WatchHandle|WatchHandle []

Handles marked for removal once the widget is destroyed.

postInitialize()inherited

This method is primarily used by developers when implementing custom widgets. Executes after widget is ready for rendering.

render(){Object}inherited

This method is primarily used by developers when implementing custom widgets. It must be implemented by subclasses for rendering.

Returns:

Type	Description
Object	The rendered virtual node.

renderNow()inherited

Renders widget to the DOM immediately.

scheduleRender()inherited

This method is primarily used by developers when implementing custom widgets. Schedules widget rendering. This method is useful for changes affecting the UI.

Type Definitions

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:

playButtons Boolean

optional

Default Value:true

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

shadowsToggle Boolean

optional

Default Value:true

When set to false, the shadow toggle button is not 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.

ArcGIS API for JavaScript

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