LayerView

Class: esri/views/layers/LayerView
Inheritance: LayerView Accessor
Since: ArcGIS API for JavaScript 4.0

Represents the view for a single layer after it has been added to either a MapView or a SceneView.

See also:

Property Overview

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

The name of the class.

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Layer

The layer being viewed.

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Boolean

Value is true if the layer is suspended (i.e., layer will not redraw or update itself when the extent changes).

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Boolean

Value is true when the layer is updating; for example, if it is in the process of fetching data.

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Boolean

When true, the layer is visible in the view.

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Property Details

declaredClassStringreadonly

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

layerLayerreadonly

The layer being viewed.

suspendedBooleanreadonly

Value is true if the layer is suspended (i.e., layer will not redraw or update itself when the extent changes).

updatingBooleanreadonly

Value is true when the layer is updating; for example, if it is in the process of fetching data.

Default Value: false

visibleBoolean

When true, the layer is visible in the view. Set this property to false to hide the layer from the view.

Default Value: true

Method Overview

NameReturn TypeSummary
Promise

An instance of this class is a Promise.

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Boolean

An instance of this class is a Promise.

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Boolean

An instance of this class is a Promise.

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Boolean

An instance of this class is a Promise.

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Promise

An instance of this class is a Promise.

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Promise

An instance of this class is a Promise.

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Method Details

always(callbackOrErrback){Promise}

An instance of this class is a Promise. Therefore always() may be used to execute a function if the promise is rejected or resolved. The input function will always execute no matter the response. For more information about promises, see the Working with Promises guide page.

Parameter:
callbackOrErrback Function
optional

The function to execute when the promise is rejected or resolved.

Returns:
TypeDescription
PromiseReturns a new promise for the result of callbackOrErrback.
Example:
// Although this example uses MapView, any class instance that is a promise may use always() in the same way
var view = new MapView();
view.always(function(){
  // This function will always execute whether or not the promise is resolved or rejected
});

isFulfilled(){Boolean}

An instance of this class is a Promise. Therefore isFulfilled() may be used to verify if the promise is fulfilled (either resolved or rejected). If it is fulfilled, true will be returned. See the Working with Promises guide page for more information about promises.

Returns:
TypeDescription
BooleanIndicates whether the promise has been fulfilled (either resolved or rejected).

isRejected(){Boolean}

An instance of this class is a Promise. Therefore isRejected() may be used to verify if the promise is rejected. If it is rejected, true will be returned. See the Working with Promises guide page for more information about promises.

Returns:
TypeDescription
BooleanIndicates whether the promise has been rejected.

isResolved(){Boolean}

An instance of this class is a Promise. Therefore isResolved() may be used to verify if the promise is resolved. If it is resolved, true will be returned. See the Working with Promises guide page for more information about promises.

Returns:
TypeDescription
BooleanIndicates whether the promise has been resolved.

otherwise(errback){Promise}

An instance of this class is a Promise. Use otherwise() to call a function once the promise is rejected.

Parameter:
errback Function
optional

The function to execute when the promise fails.

Returns:
TypeDescription
PromiseReturns a new promise for the result of errback.
Example:
// Although this example uses MapView, any class instance that is a promise may use otherwise() in the same way
var view = new MapView();
view.otherwise(function(error){
  // This function will execute if the promise is rejected due to an error
});

then(callback, errback, progback){Promise}

An instance of this class is a Promise. Therefore then() 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 promise resolves (when the instance of the class loads). The errback executes if the promise fails. See the Working with Promises guide page for additional details.

Parameters:
callback Function
optional

The function to call when the promise resolves.

errback Function
optional

The function to execute when the promise fails.

progback Function
optional

The function to invoke when the promise emits a progress update.

Returns:
TypeDescription
PromiseReturns a new promise for the result of callback that may be used to chain additional functions.
Example:
// Although this example uses MapView, any class instance that is a promise may use then() in the same way
var view = new MapView();
view.then(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
});

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