Custom pipes Angular 2+

truncate-pipe.ts

Angular 2+

import {
    Pipe,
    PipeTransform
} from '@angular/core';

@Pipe({
    name: 'truncate'
})
export class TruncatePipe implements PipeTransform {
    transform(value: string, len: number, typeLen: string): any {
        /**
         * check null & undefine
         */
        console.log('value: ' + value);
        console.log('len: ' + len);
        console.log('typeLen: ' + typeLen);
        /**
         * custom pipes
         */
        return value + '...';
    }
}

app.module.ts

Angular 2+

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';

import { AppComponent } from './app.component';

import { TruncatePipe } from './truncate-pipe';

@NgModule({
  declarations: [
    AppComponent,
    TruncatePipe
  ],
  imports: [
    BrowserModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

app.component.ts

Angular 2+

import { Component } from '@angular/core';

import { TruncatePipe } from './truncate-pipe';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css'],
  providers: [TruncatePipe]
})
export class AppComponent {
  test = 'The Dolore is a French river in the Auvergne region.';
}

app.component.html

Angular 2+

<h2>{{ test | truncate : 15 : 'fullwidth' }}</h2>

Demo | Github | Download.zip