、私はこのようになりますcustom form validatorあります角度反応性のフォームとカスタム検証エラー
import { AbstractControl, ValidationErrors, ValidatorFn } from '@angular/forms';
export function myCustomValidator(myCustomArg: string): ValidatorFn {
return (control: AbstractControl): ValidationErrors | null => {
if (control.value) {
// do some checks with control.value and myCustomArg
// return error if needed
}
// return null otherwise
control.setErrors(null);
return null;
};
}
が、私は私のreactive formsのいずれかでそれを使用しようとすると:
ngOnInit() {
this.form = new FormGroup({
'myControl': new FormControl(null, [ myCustomValidator(...) ]),
// ...
});
}
私が手にいくつかのエラー:
ERROR TypeError: Cannot read property 'emit' of undefined at FormControl.webpackJsonp.../../../forms/@angular/forms.es5.js.AbstractControl._updateControlsErrors (forms.es5.js:2836) at FormControl.webpackJsonp.../../../forms/@angular/forms.es5.js.AbstractControl.setErrors (forms.es5.js:2772) at file-extension.validator.ts:17 at forms.es5.js:506 at Array.map() at _executeValidators (forms.es5.js:506) at FormControl.validator (forms.es5.js:462) at FormControl.webpackJsonp.../../../forms/@angular/forms.es5.js.AbstractControl._runValidator (forms.es5.js:2720) at FormControl.webpackJsonp.../../../forms/@angular/forms.es5.js.AbstractControl.updateValueAndValidity (forms.es5.js:2688) at new FormControl (forms.es5.js:3011)
ERROR CONTEXT DebugContext_ {view: {…}, nodeIndex: 0, nodeDef: {…}, elDef: {…}, elView: {…}}
ERROR Error: formGroup expects a FormGroup instance. Please pass one in.
しかし残念ながら、彼らは非常に有用ではありません。