ion-loading

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.

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. 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.

Customization

Loading uses scoped encapsulation, which means it will automatically scope its CSS by appending each of the styles with an additional class at runtime. Overriding scoped selectors in CSS requires a higher specificity selector.

We recommend passing a custom class to cssClass in the create method and using that to add custom styles to the host and inner elements. This property can also accept multiple classes separated by spaces. View the Usage section for an example of how to pass a class using cssClass.

/* DOES NOT WORK - not specific enough */
ion-loading {
  color: green;
}

/* Works - pass "my-custom-class" in cssClass to increase specificity */
.my-custom-class {
  color: green;
}

Any of the defined CSS Custom Properties can be used to style the Loading without needing to target individual elements:

.my-custom-class {
  --background: #222;
  --spinner-color: #fff;

  color: #fff;
}

If you are building an Ionic Angular app, the styles need to be added to a global stylesheet file. Read Style Placement in the Angular section below for more information.

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({
      cssClass: 'my-custom-class',
      message: 'Please wait...',
      duration: 2000,
    });
    await loading.present();

    const { role, data } = await loading.onDidDismiss();
    console.log('Loading dismissed!');
  }

  async presentLoadingWithOptions() {
    const loading = await this.loadingController.create({
      spinner: null,
      duration: 5000,
      message: 'Click the backdrop to dismiss early...',
      translucent: true,
      cssClass: 'custom-class custom-loading',
      backdropDismiss: true,
    });
    await loading.present();

    const { role, data } = await loading.onDidDismiss();
    console.log('Loading dismissed with role:', role);
  }
}

Style Placement

In Angular, the CSS of a specific page is scoped only to elements of that page. Even though the Loading can be presented from within a page, the ion-loading element is appended outside of the current page. This means that any custom styles need to go in a global stylesheet file. In an Ionic Angular starter this can be the src/global.scss file or you can register a new global style file by adding to the styles build option in angular.json.

Javascript

async function presentLoading() {
  const loading = document.createElement('ion-loading');

  loading.cssClass = 'my-custom-class';
  loading.message = 'Please wait...';
  loading.duration = 2000;

  document.body.appendChild(loading);
  await loading.present();

  const { role, data } = await loading.onDidDismiss();
  console.log('Loading dismissed!');
}

async function presentLoadingWithOptions() {
  const loading = document.createElement('ion-loading');

  loading.spinner = null;
  loading.duration = 5000;
  loading.message = 'Click the backdrop to dismiss early...';
  loading.translucent = true;
  loading.cssClass = 'custom-class custom-loading';
  loading.backdropDismiss = true;

  document.body.appendChild(loading);
  await loading.present();

  const { role, data } = await loading.onDidDismiss();
  console.log('Loading dismissed with role:', role);
}

React

/* Using with useIonLoading Hook */

import React from 'react';
import { IonButton, IonContent, IonPage, useIonLoading } from '@ionic/react';

interface LoadingProps {}

const LoadingExample: React.FC<LoadingProps> = () => {
  const [present] = useIonLoading();
  return (
    <IonPage>
      <IonContent>
        <IonButton
          expand="block"
          onClick={() =>
            present({
              duration: 3000,
            })
          }
        >
          Show Loading
        </IonButton>
        <IonButton expand="block" onClick={() => present('Loading', 2000, 'dots')}>
          Show Loading using params
        </IonButton>
      </IonContent>
    </IonPage>
  );
};

/* Using with IonLoading Component */

import React, { useState } from 'react';
import { IonLoading, IonButton, IonContent } from '@ionic/react';

export const LoadingExample: React.FC = () => {
  const [showLoading, setShowLoading] = useState(true);

  setTimeout(() => {
    setShowLoading(false);
  }, 2000);

  return (
    <IonContent>
      <IonButton onClick={() => setShowLoading(true)}>Show Loading</IonButton>
      <IonLoading
        cssClass="my-custom-class"
        isOpen={showLoading}
        onDidDismiss={() => setShowLoading(false)}
        message={'Please wait...'}
        duration={5000}
      />
    </IonContent>
  );
};

Stencil

import { Component, h } from '@stencil/core';

import { loadingController } from '@ionic/core';

@Component({
  tag: 'loading-example',
  styleUrl: 'loading-example.css',
})
export class LoadingExample {
  async presentLoading() {
    const loading = await loadingController.create({
      cssClass: 'my-custom-class',
      message: 'Please wait...',
      duration: 2000,
    });
    await loading.present();

    const { role, data } = await loading.onDidDismiss();
    console.log('Loading dismissed!', role, data);
  }

  async presentLoadingWithOptions() {
    const loading = await loadingController.create({
      spinner: null,
      duration: 5000,
      message: 'Click the backdrop to dismiss early...',
      translucent: true,
      cssClass: 'custom-class custom-loading',
      backdropDismiss: true,
    });
    await loading.present();

    const { role, data } = await loading.onDidDismiss();
    console.log('Loading dismissed with role:', role, data);
  }

  render() {
    return [
      <ion-content>
        <ion-button onClick={() => this.presentLoading()}>Present Loading</ion-button>
        <ion-button onClick={() => this.presentLoadingWithOptions()}>Present Loading: Options</ion-button>
      </ion-content>,
    ];
  }
}

Vue

<template>
  <ion-button @click="presentLoading">Show Loading</ion-button>
  <br />
  <ion-button @click="presentLoadingWithOptions">Show Loading</ion-button>
</template>

<script>

  <script>
  import { IonButton, loadingController } from '@ionic/vue';
  import { defineComponent } from 'vue';

  export default defineComponent({
    props: {
      timeout: { type: Number, default: 1000 },
    },
    methods: {
      async presentLoading() {
        const loading = await loadingController
          .create({
            cssClass: 'my-custom-class',
            message: 'Please wait...',
            duration: this.timeout,
          });

        await loading.present();

        setTimeout(function() {
          loading.dismiss()
        }, this.timeout);
      },
      async presentLoadingWithOptions() {
        const loading = await loadingController
          .create({
            spinner: null,
            duration: this.timeout,
            message: 'Click the backdrop to dismiss early...',
            translucent: true,
            cssClass: 'custom-class custom-loading',
            backdropDismiss: true
          });

        await loading.present();

        setTimeout(function() {
          loading.dismiss()
        }, this.timeout);
      },
    },
    components: { IonButton }
  });
</script>

Developers can also use this component directly in their template:

<template>
  <ion-button @click="setOpen(true)">Show Loading</ion-button>
  <ion-loading
    :is-open="isOpenRef"
    cssClass="my-custom-class"
    message="Please wait..."
    :duration="timeout"
    @didDismiss="setOpen(false)"
  >
  </ion-loading>
</template>

<script>
  import { IonLoading, IonButton } from '@ionic/vue';
  import { defineComponent, ref } from 'vue';

  export default defineComponent({
    props: {
      timeout: { type: Number, default: 1000 },
    },
    components: { IonLoading, IonButton },
    setup() {
      const isOpenRef = ref(false);
      const setOpen = (state: boolean) => (isOpenRef.value = state);

      return { isOpenRef, setOpen };
    },
  });
</script>

Properties

animated

Description	trueの場合、ロードインジケータをアニメーションで表示します。
Attribute	animated
Type	boolean
Default	true

backdropDismiss

Description	trueの場合、バックドロップがクリックされたときにローディングインジケータが解除される。
Attribute	backdrop-dismiss
Type	boolean
Default	false

cssClass

Description	Additional classes to apply for custom CSS. If multiple classes are provided they should be separated by spaces.
Attribute	css-class
Type	string ｜ string[] ｜ undefined
Default	undefined

duration

Description	ローディングインジケータを解除するまでの待ち時間（ミリ秒）。
Attribute	duration
Type	number
Default	0

enterAnimation

Description	ローディングインジケータが表示されたときに使用するアニメーションです。
Attribute	undefined
Type	((baseEl: any, opts?: any) => Animation) ｜ undefined
Default	undefined

htmlAttributes

Description	ローダーに渡す追加属性。
Attribute	undefined
Type	LoadingAttributes ｜ undefined
Default	undefined

keyboardClose

Description	trueの場合、オーバーレイが表示されたときにキーボードが自動的に解除されます。
Attribute	keyboard-close
Type	boolean
Default	true

leaveAnimation

Description	ローディングインジケータが解除されたときに使用するアニメーションです。
Attribute	undefined
Type	((baseEl: any, opts?: any) => Animation) ｜ undefined
Default	undefined

message

Description	ロードインジケータに表示するテキストコンテンツは任意です。
Attribute	message
Type	IonicSafeString ｜ string ｜ undefined
Default	undefined

mode

Description	modeは、どのプラットフォームのスタイルを使用するかを決定します。
Attribute	mode
Type	"ios" ｜ "md"
Default	undefined

showBackdrop

Description	trueの場合、ロードインジケータの後ろにバックドロップが表示されます。
Attribute	show-backdrop
Type	boolean
Default	true

spinner

Description	表示するスピナーの名前。
Attribute	spinner
Type	"bubbles" ｜ "circles" ｜ "circular" ｜ "crescent" ｜ "dots" ｜ "lines" ｜ "lines-small" ｜ null ｜ undefined
Default	undefined

translucent

Description	If true, the loading indicator will be translucent. Only applies when the mode is "ios" and the device supports backdrop-filter.
Attribute	translucent
Type	boolean
Default	false

Events

Name	Description
ionLoadingDidDismiss	ローディングが解除された後に発行されます。
ionLoadingDidPresent	ローディングが提示された後に発行されます。
ionLoadingWillDismiss	ローディングが解除される前に発行されます。
ionLoadingWillPresent	ローディングが提示される前に発行されます。

Methods

dismiss

Description	ローディングオーバーレイが提示された後、それを解除します。
Signature	dismiss(data?: any, role?: string ｜ undefined) => Promise<boolean>

onDidDismiss

Description	ローディングが解除されたタイミングを解決するPromiseを返します。
Signature	onDidDismiss<T = any>() => Promise<OverlayEventDetail<T>>

onWillDismiss

Description	ローディングが解除されるタイミングを解決するPromiseを返します。
Signature	onWillDismiss<T = any>() => Promise<OverlayEventDetail<T>>

present

Description	作成後のローディングオーバーレイを提示します。
Signature	present() => Promise<void>

CSS Shadow Parts

No CSS shadow parts available for this component.

CSS Custom Properties

Name	Description
--backdrop-opacity	背景の不透明度
--background	ローディングダイアログの背景
--height	ローディングダイアログの高さ
--max-height	ローディングダイアログの最大の高さ
--max-width	ローディングダイアログの最大幅
--min-height	ローディングダイアログの最小高さ
--min-width	ローディングダイアログの最小幅
--spinner-color	ローディングスピナーの色
--width	ローディングダイアログの幅

Slots

No slots available for this component.