# Angular component to render currency or date values

I have an Angular component and it is just a label which renders a value and if it has an associated pipe, the output of the pipe should be rendered as value of the label. But I don't want to declare all the pipes in the component. Currently I would like to use the currency pipe and the date pipe with their parameters. But maybe I can extend the component to use other pipes.

Would you pass the pipes as input parameter of the component or what would be your approach to achieve that? Any idea?

app.component.ts

<app-custom-label value="10000" title="My Title for a Currency render" datatype="currency" param="EUR"></app-custom-label>

<app-custom-label value="01.10.1980" title="My Title for a Date render" datatype="date" param="dd MMMM"></app-custom-label>


custom.label.component.html

<h1>{{ title }}</h1>
<label> {{ value }} </label>


custom.label.component.ts

import { Component, Input, OnInit  } from '@angular/core';
import { DataType } from './type';
import { CurrencyPipe, DatePipe } from '@angular/common';
import { registerLocaleData } from '@angular/common';
import localeDe from '@angular/common/locales/de';
import localeDeExtra from '@angular/common/locales/extra/de';

registerLocaleData(localeDe, 'de-DE', localeDeExtra);

@Component({
selector: 'app-custom-label',
templateUrl: './custom.label.component.html'
})
export class CustomLabelComponent implements OnInit {
@Input() value: string;
@Input() title: string;
@Input() datatype: DataType;
@Input() param: string;

constructor() {}

ngOnInit(){
if (this.datatype === "currency") {
this.value = (new CurrencyPipe('de-DE')).transform(this.value, this.param, true);
} else if (this.datatype === "date") {
this.value = (new DatePipe('de-DE')).transform(this.value, this.param);
}
}
}


Here you have my StackBlitz. If you can see, I pass a type of a pipe and its params as parameters, if I want to use any pipe. The component could also render a label without using a pipe.

https://stackblitz.com/edit/angular-label-render

The syntax of both the pipes:

Currency Pipe

{{ value_expression | currency [ : currencyCode [ : display [ : digitsInfo [ : locale ] ] ] ] }}


and Date Pipe

{{ value_expression | date [ : format [ : timezone [ : locale ] ] ] }}


In my understanding, we must use pipes to integrate directly into the "templates" and avoid writing excess code in the component. In your approach, passing the pipe names and the other parameters appears to me as a redundant step.

My approach would be:

<app-custom-label value="{{10000 | currency:'EUR':true:null:'de-DE'}}" title="My Title for a Currency render"></app-custom-label>
<app-custom-label value="{{'01.10.1980' | date:'dd MMMM':null:'de-DE'}}" title="My Title for a Date render">