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NativeScript Angular

Activity Indicator

The ActivityIndicator represents a UI widget which displays a progress indicator hinting the user for some background operation running like loading image, data, accepting a request, etc. You can control its behavior by setting or binding to its busy property.



You can work with its boolean busy property and set it to true or false, thus displaying or hiding the control.

<ActivityIndicator [busy]="isBusy" (busyChange)="onBusyChanged($event)"></ActivityIndicator>
import { Component } from "@angular/core";
import { ActivityIndicator } from "tns-core-modules/ui/activity-indicator";
import { EventData } from "tns-core-modules/data/observable";

    templateUrl: "./usage.component.html"
export class ActivityIndicatorUsageComponent {
    isBusy: boolean = true;

    onBusyChanged(args: EventData) {
        let indicator: ActivityIndicator = <ActivityIndicator>args.object;
        console.log("indicator.busy changed to: " + indicator.busy);


The ActivityIndicator supports styling the color (default value is blue) and backgroundColor (default value is transparent) properties.

<ActivityIndicator busy="true" color="red" width="100" height="100"></ActivityIndicator>
@nativescript/theme CSS class Description
activity-indicator Styles the color of the indicator in sync with the main theme color.


Name Type Description
busy boolean Gets or sets a value indicating whether the widget is currently displaying progress.


Name Description
busyChange Emitted when the ActivityIndicator busy property is changed.
loaded Emitted when the view is loaded.
unloaded Emitted when the view is unloaded.
layoutChanged Emitted when the layout bounds of a view changes due to layout processing.

API References

Name Type
ActivityIndicator Module
ActivityIndicator Class

Native Component

Android iOS
android.widget.ProgressBar (indeterminate = true) UIActivityIndicatorView