Angular Image Loader

A simple progressive/responsive/lazy loading image library for Angular that detects browser size and loads the appropriate image only when the element is in view. Classes are attributed and events emited on image loads. This package requires @thisissoon/angular-inviewport.

This is a simple library for Angular, implemented in the Angular Package Format v5.0.

Install

via NPM

npm i @thisissoon/{angular-image-loader,angular-inviewport} --save

via Yarn

yarn add @thisissoon/angular-image-loader @thisissoon/angular-inviewport

app.module.ts

import {
  ImageLoaderModule,
  VideoLoaderModule,
} from '@thisissoon/angular-image-loader';
import { InViewportModule } from '@thisissoon/angular-inviewport';

@NgModule({
  imports: [
    InViewportModule,
    ImageLoaderModule, // Only this import required if using just the image loader
    VideoLoaderModule, // Only this import required if using just the video loader
  ],
})
export class AppModule {}

app.server.module.ts (Only needed if using Angular Universal)

import { ImageLoaderModule } from '@thisissoon/angular-image-loader';
import { InViewportModule, WindowRef } from '@thisissoon/angular-inviewport';

@NgModule({
  imports: [InViewportModule.forServer(), ImageLoaderModule, VideoLoaderModule],
})
export class AppModule {}

Image Loader Example

A working example can be found inside /src folder.

app.component.html

<sn-image-loader
  [image]="image"
  [sizes]="sizes"
  imgClass="img"
  alt="lorem ipsum"
  (placeholderLoaded)="onPlaceholderLoad($event)"
  (imageLoaded)="onImageLoad($event)"
>
</sn-image-loader>

app.component.ts

export class AppComponent {
  sizes: Breakpoint[] = [
    { size: 'xs', width: 0 },
    { size: 'md', width: 768 },
    { size: 'lg', width: 992 },
  ];

  image: ResponsiveImage = {
    placeholder: 'http://via.placeholder.com/35x15?text=placeholder',
    fallback: 'http://via.placeholder.com/350x150?text=fallback',
    images: [
      {
        size: 'xs',
        x1: 'http://via.placeholder.com/150x350?text=xs+1x',
        x2: 'http://via.placeholder.com/300x700?text=xs+2x',
      },
      {
        size: 'md',
        x1: 'http://via.placeholder.com/350x250?text=md+1x',
        x2: 'http://via.placeholder.com/700x500?text=md+2x',
      },
      {
        size: 'lg',
        x1: 'http://via.placeholder.com/700x400?text=lg+1x',
        x2: 'http://via.placeholder.com/1400x800?text=lg+2x',
      },
    ],
  };

  public onPlaceholderLoad(imageLoadedEvent: ImageLoadedEvent) {
    // Do something
  }

  public onImageLoad(imageLoadedEvent: ImageLoadedEvent) {
    // Do something
  }
}

app.component.css

.foo {
  transition: all 0.35s ease-in-out;
}

.sn-image-not-loaded ::ng-deep .img {
  filter: blur(20px);
}

.sn-image-loaded ::ng-deep .img {
  filter: blur(0);
}

Video Loader Example

app.component.html

<sn-video-loader
  [sizes]="sizes"
  [video]="video"
  [loop]="true"
  [muted]="true"
  [autoplay]="true"
  [controls]="true"
  [playsInline]="true"
  type="video/mp4"
  videoClass="video"
  posterClass="img"
>
</sn-video-loader>

app.component.ts

export class AppComponent {
  sizes: Breakpoint[] = [
    { size: 'xs', width: 0 },
    { size: 'md', width: 768 },
    { size: 'lg', width: 992 },
  ];

  video: ResponsiveVideo = {
    videos: [
      {
        size: 'xs',
        url:
          'http://res.cloudinary.com/thisissoon/video/upload/ac_none,c_fill,h_568,q_80,w_320/v1517616795/demos/jellyfish-25-mbps-hd-hevc.mp4',
      },
      {
        size: 'md',
        url:
          'http://res.cloudinary.com/thisissoon/video/upload/ac_none,c_fill,h_1024,q_80,w_768/v1517616795/demos/jellyfish-25-mbps-hd-hevc.mp4',
      },
      {
        size: 'lg',
        url:
          'http://res.cloudinary.com/thisissoon/video/upload/ac_none,c_fill,h_720,q_80,w_1280/v1517616795/demos/jellyfish-25-mbps-hd-hevc.mp4',
      },
    ],
    poster: {
      // Responsive image, the same object as used for the image loader
    },
  };
}

Development server

Run ng serve for a dev server. Navigate to http://localhost:4200/. 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.

Build

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.

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.

Making Commits

This repo uses Commitizen CLI and Conventional Changelog to create commits and generate changelogs. Instead of running git commit run git cz and follow the prompts. Changelogs will then be generated when creating new releases by running npm run release.

Making Releases

Run npm run release to create a new release. This will use Standard Version to create a new release. Standard Version will generate / update the changelog based on commits generated using Commitizen CLI, update the version number following semantic versioning rules and then commit and tag the commit for the release. Simply run git push --follow-tags origin master.

Further help

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