How to create a pipe that converts RGB color codes to hexadecimal format

Question

Can you tell me How to create a pipe that converts RGB color codes to hexadecimal format?

Answer 1

To create an Angular pipe that converts RGB color codes to hexadecimal format, follow these steps:

Generate the Pipe:

Use Angular CLI to create a pipe:

ng generate pipe rgbToHex

Implement the Pipe:

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

@Pipe({ name: 'rgbToHex' })

export class RgbToHexPipe implements PipeTransform {

  transform(rgb: string): string {

    const rgbValues = rgb.match(/\d+/g);

    if (!rgbValues || rgbValues.length !== 3) {

      return rgb; // Return input if invalid

    }

    const [r, g, b] = rgbValues.map(num => {

      const hex = parseInt(num).toString(16).padStart(2, '0');

      return hex;

    });

    return `#${r}${g}${b}`.toUpperCase();

  }

}

Declare the Pipe:

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

import { RgbToHexPipe } from './rgb-to-hex.pipe';

@NgModule({

  declarations: [RgbToHexPipe],

  // ...

})

export class AppModule {}

Use in Template:

Apply the pipe to convert RGB to hex:

<div>{{ 'rgb(255, 128, 0)' | rgbToHex }}</div>

<!-- Output: #FF8000 -->

<div>{{ '255, 128, 0' | rgbToHex }}</div>

<!-- Output: #FF8000 -->