An overlay that can be used to indicate activity while blocking user interaction. The loading indicator appears on top of the app's content, and can be dismissed by the app to resume user interaction with the app. It includes an optional backdrop, which can be disabled by setting showBackdrop: false upon creation.

Creating

Loading indicators can be created using a Loading Controller. They can be customized by passing loading options in the loading controller's create method. The spinner name should be passed in the spinner property, and any optional HTML can be passed in the content property. If a value is not passed to spinner the loading indicator will use the spinner specified by the platform.

Dismissing

The loading indicator can be dismissed automatically after a specific amount of time by passing the number of milliseconds to display it in the duration of the loading options. By default the loading indicator will show even during page changes, but this can be disabled by setting dismissOnPageChange to true. To dismiss the loading indicator after creation, call the dismiss() method on the loading instance. The onDidDismiss function can be called to perform an action after the loading indicator is dismissed.

Usage

Angular

import { Component } from '@angular/core';
import { LoadingController } from '@ionic/angular';

@Component({
  selector: 'loading-example',
  templateUrl: 'loading-example.html',
  styleUrls: ['./loading-example.css']
})
export class LoadingExample {
  constructor(public loadingController: LoadingController) {}

  async presentLoading() {
    const loading = await this.loadingController.create({
      message: 'Hellooo',
      duration: 2000
    });
    return await loading.present();
  }

  async presentLoadingWithOptions() {
    const loading = await this.loadingController.create({
      spinner: null,
      duration: 5000,
      message: 'Please wait...',
      translucent: true,
      cssClass: 'custom-class custom-loading'
    });
    return await loading.present();
  }
}

Javascript

async function presentLoading() {
  const loadingController = document.querySelector('ion-loading-controller');
  await loadingController.componentOnReady();

  const loading = await loadingController.create({
    message: 'Hellooo',
    duration: 2000
  });
  return await loading.present();
}

async function presentLoadingWithOptions() {
  const loadingController = document.querySelector('ion-loading-controller');
  await loadingController.componentOnReady();

  const loading = await loadingController.create({
    spinner: null,
    duration: 5000,
    message: 'Please wait...',
    translucent: true,
    cssClass: 'custom-class custom-loading'
  });
  return await loading.present();
}

Properties

Property	Attribute	Description	Type	Default
`animated`	`animated`	If `true`, the loading indicator will animate.	`boolean`	`true`
`backdropDismiss`	`backdrop-dismiss`	If `true`, the loading indicator will be dismissed when the backdrop is clicked.	`boolean`	`false`
`cssClass`	`css-class`	Additional classes to apply for custom CSS. If multiple classes are provided they should be separated by spaces.	`string \| string[] \| undefined`	`undefined`
`duration`	`duration`	Number of milliseconds to wait before dismissing the loading indicator.	`number`	`0`
`enterAnimation`	--	Animation to use when the loading indicator is presented.	`((Animation: Animation, baseEl: any, opts?: any) => Promise<Animation>) \| undefined`	`undefined`
`keyboardClose`	`keyboard-close`	If `true`, the keyboard will be automatically dismissed when the overlay is presented.	`boolean`	`true`
`leaveAnimation`	--	Animation to use when the loading indicator is dismissed.	`((Animation: Animation, baseEl: any, opts?: any) => Promise<Animation>) \| undefined`	`undefined`
`message`	`message`	Optional text content to display in the loading indicator.	`string \| undefined`	`undefined`
`mode`	`mode`	The mode determines which platform styles to use.	`"ios" \| "md"`	`undefined`
`showBackdrop`	`show-backdrop`	If `true`, a backdrop will be displayed behind the loading indicator.	`boolean`	`true`
`spinner`	`spinner`	The name of the spinner to display.	`"bubbles" \| "circles" \| "crescent" \| "dots" \| "lines" \| "lines-small" \| null \| undefined`	`undefined`
`translucent`	`translucent`	If `true`, the loading indicator will be translucent.	`boolean`	`false`

Events

Event	Description	Type
`ionLoadingDidDismiss`	Emitted after the loading has dismissed.	`CustomEvent<OverlayEventDetail>`
`ionLoadingDidPresent`	Emitted after the loading has presented.	`CustomEvent<void>`
`ionLoadingWillDismiss`	Emitted before the loading has dismissed.	`CustomEvent<OverlayEventDetail>`
`ionLoadingWillPresent`	Emitted before the loading has presented.	`CustomEvent<void>`

Methods

`dismiss(data?: any, role?: string | undefined) => Promise<boolean>`

Dismiss the loading overlay after it has been presented.

Parameters

Name	Type	Description
`data`	`any`
`role`	`string \| undefined`

Returns

Type: Promise<boolean>

`onDidDismiss() => Promise<OverlayEventDetail<any>>`

Returns a promise that resolves when the loading did dismiss.

Returns

Type: Promise<OverlayEventDetail<any>>

`onWillDismiss() => Promise<OverlayEventDetail<any>>`

Returns a promise that resolves when the loading will dismiss.

Returns

Type: Promise<OverlayEventDetail<any>>

`present() => Promise<void>`

Present the loading overlay after it has been created.

Returns

Type: Promise<void>

CSS Custom Properties

Name	Description
`--background`	Background of the loading dialog
`--height`	Height of the loading dialog
`--max-height`	Maximum height of the loading dialog
`--max-width`	Maximum width of the loading dialog
`--min-height`	Minimum height of the loading dialog
`--min-width`	Minimum width of the loading dialog
`--spinner-color`	Color of the loading spinner
`--width`	Width of the loading dialog

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