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maxLength

Validate that a string has at most N characters.

Signature​

NguardValidators.String.maxLength(n: number): ValidatorFn
ParameterTypeDescription
nnumberMaximum allowed length

Reactive forms​

import { FormControl } from '@angular/forms';
import { NguardValidators } from 'ng-nguard';

const username = new FormControl('', [NguardValidators.String.maxLength(20)]);

Template-driven forms​

<input ngModel name="username" [nguardMaxLength]="20" />

Error key​

{ maxLength: true }

Notes​

  • The check is <= (inclusive). maxLength(20) accepts length 20.
  • null, undefined, non-string inputs all fail.
  • Empty strings pass any maxLength(n) where n >= 0.

See also​