Package Exports

ng-in-viewport

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (ng-in-viewport) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

ng-in-viewport

Allows us to check if an element is within the browsers visual viewport

Installation

npm install --save ng-in-viewport

Demo

Here is example app

Simple usage example

import { NgModule, Component, ViewEncapsulation, Renderer2 } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { InViewportModule } from 'ng-in-viewport';

@NgModule({
  declarations: [
    InVpExampleComponent
  ],
  imports: [
    BrowserModule,
    InViewportModule.forRoot()
  ],
  providers: [],
  bootstrap: [InVpExampleComponent]
})
export class InVpExampleModule {}

@Component({
  selector: 'in-vp-example',
  encapsulation: ViewEncapsulation.None,
  template: `
    <main>
      <section>
        <div *ngFor="let item of items" class="item"
             in-viewport
             [inViewportOptions]="{ partial: false }"
             (inViewportAction)="action($event)">
          {{ item }}
        </div>
      </section>
      <section #secondSection>
        <div *ngFor="let item of items" class="item"
             in-viewport
             [inViewportOptions]="{ rootElement: secondSection, partial: false }"
             (inViewportAction)="action($event)">
          {{ item }}
        </div>
      </section>
    </main>
  `,
  styles: [`
    *, *::before, *::after {
      box-sizing: border-box;
    }
    
    html, body {
      margin: 0;
      padding: 0;
    }
    
    main {
      width: 100%;
      min-height: 100vh;
      margin: 0 auto;
      padding: 10px;
      display: flex;
      flex-flow: row nowrap;
      background-color: #f4f4f4;
    }
    
    section {
      margin: 0;
      padding: 10px;
      display: block;
      flex: 1 0 auto;
      border: 1px solid #bdbdbd;
    }
    
    section:not(:first-of-type) {
      margin-left: 10px;
    }
    
    section:nth-of-type(2) {
      height: 80vh;
      overflow: auto;
    }
    
    .item {
      width: 100%;
      height: 10vh;
      display: flex;
      justify-content: center;
      align-items: center;
      background-color: #cccccc;
      font-size: 2em;
      font-weight: bold;
      color: #ffffff;
      transition: background-color 250ms linear;
    }
    
    .item:not(:first-child) {
      margin-top: 10px;
    }
    
    .item.active {
      background-color: #00a42f;
    }
  `]
})
export class InVpExampleComponent {
  items: number[];

  constructor(private renderer: Renderer2) {
    this.items = Array(100).fill(void 0).map((v, i) => (i + 1));
  }

  action(event) {
    if (event.value) {
      this.renderer.addClass(event.target, 'active');
      this.renderer.removeClass(event.target, 'inactive');
    } else {
      this.renderer.addClass(event.target, 'inactive');
      this.renderer.removeClass(event.target, 'active');
    }
  }
}

License

MIT