How can I implement custom validation for checkboxes in Angular Material?

How can I implement custom validation for checkboxes in Angular Material?

You can create a custom validator function and apply it to your checkbox form control. Would you like a code example?

Yes, please provide a code example for that.

Sure! Here’s a simple example:

import { AbstractControl, ValidatorFn } from '@angular/forms';

export function checkboxRequiredValidator(): ValidatorFn {
  return (control: AbstractControl): { [key: string]: any } | null => {
    return control.value ? null : { 'required': true };
  };
}

You can then use this validator in your form group.

How do I apply this validator to my checkbox in the template?

In your template, you can bind the checkbox to the form control and use the required attribute to show validation errors. Here's an example:

<mat-checkbox [formControl]='myCheckbox' required>Accept Terms</mat-checkbox>
<div *ngIf="myCheckbox.errors?.required">You must accept the terms!</div>