👀 Views: 472 💬 Answers: 1 📅 Created: 2025-06-08

angular reactive-forms form-validation typescript

Hey everyone, I'm running into an issue that's driving me crazy. I'm optimizing some code but I'm currently facing an issue with form submissions in an Angular application using reactive forms... My form includes several fields, including a dropdown that dynamically populates based on a previous selection. After submitting the form, the values in certain fields, particularly the dropdown, reset to their default state instead of retaining the selected values. I've set up the form as follows: ```typescript import { Component, OnInit } from '@angular/core'; import { FormBuilder, FormGroup, Validators } from '@angular/forms'; import { MyService } from './my.service'; @Component({ selector: 'app-my-form', templateUrl: './my-form.component.html' }) export class MyFormComponent implements OnInit { myForm: FormGroup; options: string[] = []; constructor(private fb: FormBuilder, private myService: MyService) {} ngOnInit() { this.myForm = this.fb.group({ primaryField: ['', Validators.required], dependentField: ['', Validators.required] }); this.myForm.get('primaryField').valueChanges.subscribe(value => { this.loadOptions(value); }); } loadOptions(value: string) { this.myService.getOptions(value).subscribe(options => { this.options = options; this.myForm.get('dependentField').reset(); // This line resets the dependent field }); } onSubmit() { if (this.myForm.valid) { console.log(this.myForm.value); this.myForm.reset(); // Resetting the form after submission } } } ``` After looking through my code, I noticed that when I reset the form in the `onSubmit` method, it clears all fields. However, I intended for the dropdown to keep its selected value until the user actively changes it. Despite trying to remove the reset call in `loadOptions`, I still experience issues where the selected option in the dropdown gets lost on subsequent submissions. I also considered utilizing `patchValue()` instead of `reset()`, but I can’t seem to implement it correctly in this workflow. One thing to note is that I'm using Angular version 14.0.0 and RxJS version 7.1.0. I would appreciate any guidance on how to retain the dropdown value after submitting or any better practices in managing state with reactive forms in Angular. This is part of a larger mobile app I'm building. I'd really appreciate any guidance on this. This is happening in both development and production on Debian. Hoping someone can shed some light on this.