Effortlessly adding loading spinners to images with Ionic 2, Ionic 3, and Ionic 4!

Question

Effortlessly adding loading spinners to images with Ionic 2, Ionic 3, and Ionic 4!

My Ionic2 application utilizes ion-img to properly load images, but I am seeking a way to notify the user that the picture is loading. Any suggestions would be greatly appreciated!

EDIT : If you must use the ion-img tag, here is the solution. Otherwise, consider using ionic-image-loader as recommended by AdminDev826.

To address this issue, I used CSS to style the ion-img tag. Initially, when an image is loading in Ionic2, the ion-img tag does not have any class. Once the image has loaded, the ion-img tag receives the "img-loaded" class.

Below is how I implemented the solution :

  <ion-img [src]="img.src"></ion-img>
  <ion-spinner></ion-spinner>

Here is the CSS I used :

.img-loaded + ion-spinner {
  display:none;
}

I hope this can benefit someone else!

mobile angular typescript sass ionic2

Answer 1

Answer №1

After struggling with a CSS issue, I finally found a solution! In Ionic 2, when an image is loading, the ion-img tag initially lacks any class. However, once the image finishes loading, the ion-img tag receives the "img-loaded" class.

Here is how I resolved the issue :

  <ion-img [src]="img.src"></ion-img>
  <ion-spinner></ion-spinner>

Below is the CSS code I used :

.img-loaded + ion-spinner {
  display:none;
}

I hope this solution proves helpful to others facing a similar problem!

Answer 2

After struggling with a CSS issue, I finally found a solution! In Ionic 2, when an image is loading, the ion-img tag initially lacks any class. However, once the image finishes loading, the ion-img tag receives the "img-loaded" class.

Here is how I resolved the issue :

  <ion-img [src]="img.src"></ion-img>
  <ion-spinner></ion-spinner>

Below is the CSS code I used :

.img-loaded + ion-spinner {
  display:none;
}

I hope this solution proves helpful to others facing a similar problem!

Answer 3

Answer №2

For those looking to replace the ion-img tag with the img tag, here's how you can do it:

  <img src="{{image.src}}" (load)="loaded = true" [ngClass]="{'img-loaded':loaded}" [hidden]="!loaded" *ngIf="image_exists" />
  <ion-spinner [ngClass]="{'center':true}" *ngIf="!loaded"></ion-spinner>

Include the following CSS in your stylesheet:

 .img-loaded + ion-spinner {
  display:none;
}
// In this case, use .center to center the spinner
.center{
  margin-left: auto;
  margin-right: auto;
  display: block;
}

loaded is a boolean variable with a default value of false that must be defined in your component.

Answer 4

For those looking to replace the ion-img tag with the img tag, here's how you can do it:

  <img src="{{image.src}}" (load)="loaded = true" [ngClass]="{'img-loaded':loaded}" [hidden]="!loaded" *ngIf="image_exists" />
  <ion-spinner [ngClass]="{'center':true}" *ngIf="!loaded"></ion-spinner>

Include the following CSS in your stylesheet:

 .img-loaded + ion-spinner {
  display:none;
}
// In this case, use .center to center the spinner
.center{
  margin-left: auto;
  margin-right: auto;
  display: block;
}

loaded is a boolean variable with a default value of false that must be defined in your component.

Answer 5

Answer №3

It is recommended to utilize the ionic-image-loader plugin for better performance

Begin by installing the NPM Package
```
npm install --save ionic-image-loader
```

Next, install the necessary Plugins

npm i --save @ionic-native/file

ionic plugin add cordova-plugin-file --save

npm i --save @ionic-native/transfer
ionic plugin add cordova-plugin-file-transfer --save

Import the IonicImageLoader module

Add IonicImageLoader.forRoot() in your app's root module

import { IonicImageLoader } from 'ionic-image-loader';

// import the module
@NgModule({
 ...
  imports: [
    IonicImageLoader.forRoot()
  ]
})
export class AppModule {}

Afterwards, incorporate IonicImageLoader in your child/shared module(s)

import { IonicImageLoader } from 'ionic-image-loader';

@NgModule({
...
  imports: [
    IonicImageLoader
  ]
})
export class SharedModule {}

Answer 6

It is recommended to utilize the ionic-image-loader plugin for better performance

Begin by installing the NPM Package
```
npm install --save ionic-image-loader
```

Next, install the necessary Plugins

npm i --save @ionic-native/file

ionic plugin add cordova-plugin-file --save

npm i --save @ionic-native/transfer
ionic plugin add cordova-plugin-file-transfer --save

Import the IonicImageLoader module

Add IonicImageLoader.forRoot() in your app's root module

import { IonicImageLoader } from 'ionic-image-loader';

// import the module
@NgModule({
 ...
  imports: [
    IonicImageLoader.forRoot()
  ]
})
export class AppModule {}

Afterwards, incorporate IonicImageLoader in your child/shared module(s)

import { IonicImageLoader } from 'ionic-image-loader';

@NgModule({
...
  imports: [
    IonicImageLoader
  ]
})
export class SharedModule {}

Answer 7

Answer №4

Your proposed solution may not be the most efficient, as it involves downloading all images at once. This could lead to slow performance, especially in apps like Facebook where images are abundant on the feed.

Consider utilizing a lazy loading technique like this one: https://github.com/NathanWalker/ng2-image-lazy-load

Answer 8

Your proposed solution may not be the most efficient, as it involves downloading all images at once. This could lead to slow performance, especially in apps like Facebook where images are abundant on the feed.

Consider utilizing a lazy loading technique like this one: https://github.com/NathanWalker/ng2-image-lazy-load

Answer 9

Answer №5

Issues with ionic-image-loader in Ionic4+. Solution: Create a custom component:

HTML

<ion-spinner name="dots" [hidden]="viewImage" color="primary"></ion-spinner>
<ion-img #image alt=""(ionImgDidLoad)="loadImage()" (ionError)="errorLoad()"></ion-img>

Typescript

    @Component({
      selector: 'preloader-img',
      templateUrl: './preloader-img.component.html',
      styles: [`
        ion-spinner {
          display: block;
          margin: auto;
        }
      `],
    })
    export class PreloaderImgComponent implements AfterViewInit {
      viewImage = false;

      @Input() url: string;
      @ViewChild('image', { static: false }) imageRef: IonImg;


      ngAfterViewInit() {
        this.imageRef.src = this.url;
      }
      loadImage() {
        this.viewImage = true;
      }
      errorLoad() {
        this.imageRef.src = '<your_default_img>';
      }
    }

Answer 10

Issues with ionic-image-loader in Ionic4+. Solution: Create a custom component:

HTML

<ion-spinner name="dots" [hidden]="viewImage" color="primary"></ion-spinner>
<ion-img #image alt=""(ionImgDidLoad)="loadImage()" (ionError)="errorLoad()"></ion-img>

Typescript

    @Component({
      selector: 'preloader-img',
      templateUrl: './preloader-img.component.html',
      styles: [`
        ion-spinner {
          display: block;
          margin: auto;
        }
      `],
    })
    export class PreloaderImgComponent implements AfterViewInit {
      viewImage = false;

      @Input() url: string;
      @ViewChild('image', { static: false }) imageRef: IonImg;


      ngAfterViewInit() {
        this.imageRef.src = this.url;
      }
      loadImage() {
        this.viewImage = true;
      }
      errorLoad() {
        this.imageRef.src = '<your_default_img>';
      }
    }

Effortlessly adding loading spinners to images with Ionic 2, Ionic 3, and Ionic 4!

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

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