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Awesome Open Source


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An Ionic 4 Angular module to view & zoom on images and photos without any additional dependencies.


Live Demo | Stackblitz




  • ionic >= 4.0.0
  • angular >= 8.0.0


npm install --save ngx-ionic-image-viewer



Import the module and add it to your imports section in your main AppModule:

import { NgxIonicImageViewerModule } from 'ngx-ionic-image-viewer';


  imports: [
export class AppModule {}

Import the module and add it to your imports section of your component where you want to use it (e.g. home.module.ts):

import { NgxIonicImageViewerModule } from 'ngx-ionic-image-viewer';


  imports: [
export class HomePageModule {}


Add ion-img-viewer within the HTML of your module (e.g.



Add ionImgViewer as a directive within the ion-img HTML element of your module (e.g.



Import ViewerModalComponent from ngx-ionic-image-viewer and add it to the ModalController. Within the componentProps, all available properties can be passed, whereby src is always required. In addition you must add the css class ion-img-viewer to the property cssClass. Use cssClass: ['ion-img-viewer', 'my-custom-ion-img-viewer']in case you want to add more css classes.

import { ModalController } from '@ionic/angular';
import { ViewerModalComponent } from 'ngx-ionic-image-viewer';

export class HomePage {

  constructor(public modalController: ModalController) {}

  async openViewer() {
    const modal = await this.modalController.create({
      component: ViewerModalComponent,
      componentProps: {
        src: "./assets/img/demo.jpg"
      cssClass: 'ion-img-viewer',
      keyboardClose: true,
      showBackdrop: true

    return await modal.present();
<ion-button (click)="openViewer()">Open Viewer</ion-button>



Description This attribute defines the alternative text describing the image. Users will see this text displayed if the image URL is wrong, the image is not in one of the supported formats, or if the image is not yet downloaded.
Attribute alt
Type string | undefined


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


Description Sets the color scheme.
Attribute scheme
Type "auto" | "dark" | "light" | undefined
Default "auto"


Description Options to pass to the swiper instance. See for valid options.
Attribute slideOptions
Type object | undefined
Default { centeredSlides: true, passiveListeners: false, zoom: { enabled: true } }


Description The image url. This attribute is mandatory for the <img> element.
Attribute src
Type string | undefined


Description The image url to display an alternative image in case the original image could not be loaded. Similiar to (error)="src=./assets/no-image.png"
Attribute srcFallback
Type string | undefined


Description The image url to display a high-resolution image instead of the original image when opening the viewer.
Attribute srcHighRes
Type string | undefined


Description Swipe down to close the viewer.
Attribute swipeToClose
Type boolean | undefined
Default true


Description Sets the text in the footer of the viewer.
Attribute text
Type string | undefined


Description Sets the title in the header of the viewer.
Attribute title
Type string | undefined


Description The size of the title.
Attribute titleSize
Type "large" | "small" | undefined


This project was generated with Angular CLI version 8.3.14.

Local Development

  1. Run the command to start the build every time a file change:

    npm run build:watch
  2. Run the command to create a local symlink and start a local dev server fo app dev/testing.

    npm run ionic:serve
    • npm link: Create a local symlink that can then be used in the project where you want to integrate the package as you don’t want to build, publish and update a library all the time while testing.
    • Run the command npm link ngx-ionic-image-viewer inside the projects folder to link the global installation target into your project’s node_modules folder.
    • ionic serve: Start a local dev server for app dev/testing. Navigate to http://localhost:8100/. The app will automatically reload if you change any of the source files.

Code scaffolding

Run ng generate component component-name to generate a new component. You can also use ng generate directive|pipe|service|class|guard|interface|enum|module.


Run ng build to build the project. The build artifacts will be stored in the dist/ directory. Use the --prod flag for a production build.

Check package.json for lifecycle events

Release & Publishing

Run npm run release to create a new build & release with release-it. This bumps the version of projects/ngx-ionic-image-viewer/package.json, uses conventional-changelog to update, commits package.json and and tags a new release. The new release gets published to GitHub and npm automatically.

Check package.json and .release-it.json for lifecycle events

Once the confirmation of npm has been received, the command npm run demo:update can be run to update the demo to the latest version and commit the change.

Manual Publishing

After building your library with ng build ngx-ionic-image-viewer, go to the dist folder cd dist/ngx-ionic-image-viewer and run npm publish.

Running unit tests

Run ng test to execute the unit tests via Karma.

Running end-to-end tests

Run ng e2e to execute the end-to-end tests via Protractor.

Further help

To get more help on the Angular CLI use ng help or go check out the Angular CLI README.


Run npx git-cz to generate a valid commit message. It’s easy to forget about the commit convention so to be consistent use commitizen to generate our commits and husky to manage a Git commit-msg hook to validate the commit message. Further information: How to automate versioning and publication of an npm package


Simon Golms

  • Digital Card: npx simongolms
  • Github: @simongolms
  • Website:


Contributions, issues and feature requests are welcome!
Feel free to check issues page.

Show your support

Give a ⭐️ if this project helped you!


Copyright © 2019 Simon Golms.
This project is MIT licensed.

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