Angular 15: Issues with Change Detection for Dynamic Form Arrays in Reactive Forms
I'm confused about Could someone explain I'm a bit lost with I'm sure I'm missing something obvious here, but I’m having trouble with change detection in a reactive form that includes a dynamic form array... The form works as expected when I add new controls, but the template doesn’t update properly when I delete an item from the form array, leading to stale data being displayed. Here’s a snippet of my component code: ```typescript import { Component, OnInit } from '@angular/core'; import { FormBuilder, FormGroup, FormArray } from '@angular/forms'; @Component({ selector: 'app-dynamic-form', templateUrl: './dynamic-form.component.html', }) export class DynamicFormComponent implements OnInit { myForm: FormGroup; constructor(private fb: FormBuilder) { this.myForm = this.fb.group({ items: this.fb.array([]), }); } ngOnInit() { this.addItem(); // Initial item } get items(): FormArray { return this.myForm.get('items') as FormArray; } addItem() { const itemGroup = this.fb.group({ name: [''], quantity: [1], }); this.items.push(itemGroup); } removeItem(index: number) { this.items.removeAt(index); } } ``` And here’s the template: ```html <form [formGroup]='myForm'> <div formArrayName='items'> <div *ngFor='let item of items.controls; let i = index' [formGroupName]='i'> <input formControlName='name' placeholder='Item Name' /> <input formControlName='quantity' type='number' /> <button (click)='removeItem(i)'>Remove</button> </div> </div> <button (click)='addItem()'>Add Item</button> </form> ``` The issue arises when I remove an item; the form reflects the correct number of items in the array, but the UI doesn’t update accordingly. I’ve checked for any console errors, but there’s nothing that stands out. I’ve also tried using `ChangeDetectorRef.detectChanges()`, but it didn’t resolve the issue. Is there something I might be overlooking regarding how Angular's change detection works with reactive forms, or do I need to implement some additional logic to ensure that the UI updates correctly when items are removed? I'd really appreciate any guidance on this. My team is using Typescript for this CLI tool. What's the correct way to implement this? This is for a REST API running on Debian. Any advice would be much appreciated.