Issue with Form Validation on Conditional Fields in Angular Reactive Forms
Quick question that's been bugging me - I'm working with Angular 12 and using Reactive Forms to manage my form state. I have a scenario where certain fields are displayed based on the value of a dropdown. The issue I'm facing is that the validation for these conditionally displayed fields is not being triggered correctly when they become visible. Specifically, I have a dropdown that, when set to 'Yes', shows a date picker that must be required, but when the dropdown is set to 'No', the date picker should not be required. I have set up my form like this: ```typescript this.myForm = this.fb.group({ dropdown: ['', Validators.required], dateField: ['', []] }); this.myForm.get('dropdown').valueChanges.subscribe(value => { if (value === 'Yes') { this.myForm.get('dateField').setValidators([Validators.required]); this.myForm.get('dateField').updateValueAndValidity(); } else { this.myForm.get('dateField').clearValidators(); this.myForm.get('dateField').updateValueAndValidity(); } }); ``` However, when I change the dropdown from 'Yes' to 'No', I expect the validation for `dateField` to be removed, but I still see an error message indicating that the field is required if I attempt to submit the form after changing the dropdown. I’ve also ensured that I'm calling `updateValueAndValidity()` right after modifying the validators. I've tried using `markAsPristine()` and `markAsUntouched()` on the `dateField` when clearing the validators, but that didn’t resolve the issue. I also checked the form structure and ensured that the dropdown and dateField are correctly connected in the template: ```html <form [formGroup]="myForm" (ngSubmit)="onSubmit()"> <select formControlName="dropdown"> <option value="">Select</option> <option value="Yes">Yes</option> <option value="No">No</option> </select> <input type="date" formControlName="dateField" /> <button type="submit">Submit</button> </form> ``` I’m wondering if there are any nuances I might be missing with the way Angular handles dynamic validators or if there’s a best practice approach I should consider for this type of conditional validation. Any help would be greatly appreciated! For context: I'm using Typescript on Linux.