Limiting @Input Value to a Certain Number Range using Angular

Question

Limiting @Input Value to a Certain Number Range using Angular

I need to include an InputSignal in my Angular component that only accepts arrays of numbers. Each number in the array should fall between 0.01 and 10, and cannot have more than 2 decimal places.

It is important to enforce these restrictions to ensure that developers are notified if the input does not comply with the specified criteria. How can I define the type of this InputSignal or set constraints to achieve this?

export class MyComponent {
public readonly value: InputSignal<valueType[]> = input<valueType[]>([]);
}

angular typescript signals

Answer 1

Answer №1

Using the transform function for validation, we can throw an error using throw new Error(...) to display an error message in the console!

import { Component, InputSignal, input } from '@angular/core';
import { bootstrapApplication } from 'angular/platform-browser';
import 'zone.js';

@Component({
  selector: 'app-child',
  standalone: true,
  template: ``,
})
export class Child {
  public readonly value: InputSignal<any[]> = input<any[], any[]>([], {
    transform: (data: any) => {
      const found = data.some((item: any) => item <= 10 && item >= 0.01);
      if (found) {
        throw new Error(
          'Array should not contain values greater than 10 and less than 0.01'
        );
      }
      return data;
    },
  });
}

@Component({
  selector: 'app-root',
  standalone: true,
  imports: [Child],
  template: `
    <app-child [value]="[1,2,3,4,100]"/>
  `,
})
export class App {
  name = 'Angular';
}

bootstrapApplication(App);

Click here for Stackblitz Demo

Answer 2

Using the transform function for validation, we can throw an error using throw new Error(...) to display an error message in the console!

import { Component, InputSignal, input } from '@angular/core';
import { bootstrapApplication } from 'angular/platform-browser';
import 'zone.js';

@Component({
  selector: 'app-child',
  standalone: true,
  template: ``,
})
export class Child {
  public readonly value: InputSignal<any[]> = input<any[], any[]>([], {
    transform: (data: any) => {
      const found = data.some((item: any) => item <= 10 && item >= 0.01);
      if (found) {
        throw new Error(
          'Array should not contain values greater than 10 and less than 0.01'
        );
      }
      return data;
    },
  });
}

@Component({
  selector: 'app-root',
  standalone: true,
  imports: [Child],
  template: `
    <app-child [value]="[1,2,3,4,100]"/>
  `,
})
export class App {
  name = 'Angular';
}

bootstrapApplication(App);

Limiting @Input Value to a Certain Number Range using Angular

Answer №1

Click here for Stackblitz Demo

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