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integer

Validate that a value is an integer (whole number, no fractional part).

Signature​

NguardValidators.Number.integer: ValidatorFn

A parameterless validator — used directly without invocation.

Reactive forms​

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

const age = new FormControl('', [NguardValidators.Number.integer]);

Template-driven forms​

<input ngModel name="age" nguardInteger />

Error key​

{ integer: true }

Notes​

  • Accepts integers and integer-like numeric strings ('42', '-5', '0').
  • Rejects floats (3.14, '3.14'), null, undefined, empty string, NaN, Infinity, non-numeric strings.
  • Numeric coercion applies — strings are tried as numbers first, then checked with Number.isInteger.

See also​

  • numeric — looser: floats also accepted
  • even / odd — additional parity constraints
  • digits — exact digit count