I am Using Angular 6 Reactive Form if i add new validators add and remove in dynamically i got a error is
ExpressionChangedAfterItHasBeenCheckedError: Expression has changed after it was checked. Previous value: 'disabled: false'. Current value: 'disabled: true'
.ts File
Form: FormGroup;
_UserTypes: any[] = [
{ _id: '1', User_Type: 'Sub Admin' },
{ _id: '2', User_Type: 'Manager' },
];
ShowReportsTo: Boolean = false;
constructor() { }
ngOnInit() {
this.Form = new FormGroup({
User_Type: new FormControl(null, Validators.required),
Reports_To: new FormControl(null),
});
}
UserType_Change() {
const value = this.Form.controls['User_Type'].value;
if (typeof value === 'object' && value !== null && value.User_Type !== 'Sub Admin') {
this.ShowReportsTo = true;
this.Form.controls['Reports_To'].setValidators([Validators.required]);
this.Form.updateValueAndValidity();
} else {
this.ShowReportsTo = false;
this.Form.controls['Reports_To'].clearValidators();
this.Form.controls['Reports_To'].setErrors(null);
this.Form.controls['Reports_To'].reset();
}
}
.html file
<Form [formGroup]="Form">
<div class="row">
<div class="col-sm-6 Form_Select">
<label>User Type :</label>
<ng-select formControlName="User_Type (ngModelChange)=" UserType_Change()">
<ng-option *ngFor="let Type of _UserTypes" [value]="Type">{{Type.User_Type}}</ng-option>
</ng-select>
</div>
<div class="col-sm-6 Form_Select" *ngIf="ShowReportsTo">
<label>Report To :</label>
<input type="text" formControlName="Reports_To">
</div>
</div>
<button (click)="submit()" [disabled]="Form.invalid"> Submit </button>
</Form>
if i remove the dynamic validators is working good
this error not affect my flow but throw the error in console
how to handle this error
The content of a div with *ngIf causes the error. Try this:
<ng-container *ngIf="ShowReportsTo">
<div class="col-sm-6 Form_Select">
...
</div>
</ng-container>
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