Angular Reactive Forms: Handling Dynamic Validators for Conditional Fields
I'm relatively new to this, so bear with me. After trying multiple solutions online, I still can't figure this out. I'm working with Angular 13 and trying to implement a reactive form where certain fields should have conditional validation based on the selection of another field. Specifically, I have a dropdown that, when a certain option is selected, should require additional fields to be filled out. However, even after changing the validators dynamically, the form does not seem to reflect the validation state correctly, and I'm not sure if I'm managing the state properly. Here’s a simplified version of my component code: ```typescript import { Component } from '@angular/core'; import { FormBuilder, FormGroup, Validators } from '@angular/forms'; @Component({ selector: 'app-my-form', templateUrl: './my-form.component.html' }) export class MyFormComponent { myForm: FormGroup; constructor(private fb: FormBuilder) { this.myForm = this.fb.group({ mainField: ['', Validators.required], conditionalField: ['', []], }); } onMainFieldChange(value: string) { if (value === 'require') { this.myForm.get('conditionalField').setValidators([Validators.required]); } else { this.myForm.get('conditionalField').clearValidators(); } this.myForm.get('conditionalField').updateValueAndValidity(); } } ``` In the template, I have a dropdown that triggers the `onMainFieldChange` function. However, I'm noticing that the `conditionalField` does not show validation errors as expected when the dropdown value is set to 'require'. The error messages do not appear until I interact with the form, which is frustrating. Am I missing a step in ensuring that the validation state updates correctly? Additionally, when I submit the form, even if `conditionalField` is not filled out when required, it doesn't show invalid state until after the first interaction. I would expect the form to immediately reflect this state upon the dropdown selection. I've also tried logging the form status and value, and it seems to be registered as valid until I interact with it manually. Any advice on how to properly manage this dynamic validation situation? Thank you! For context: I'm using Typescript on macOS. Is there a better approach? This is part of a larger CLI tool I'm building. Am I missing something obvious?