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Angular 14 - Issue With Function Binding Inside NgFor Loop Causing Unwanted Side Effects

๐Ÿ‘€ Views: 21 ๐Ÿ’ฌ Answers: 1 ๐Ÿ“… Created: 2025-08-24
angular ngFor change-detection typescript

I'm integrating two systems and I'm migrating some code and I'm experimenting with I'm currently working on an Angular 14 application where I need to dynamically render a list of items using `*ngFor` and bind a function to a button click to update each item's status. However, I noticed that the function seems to be affecting all items instead of just the one clicked, leading to unexpected behavior. Hereโ€™s a simplified version of my component code: ```typescript import { Component } from '@angular/core'; @Component({ selector: 'app-item-list', template: ` <div *ngFor="let item of items"> <p>{{ item.name }} - Status: {{ item.active ? 'Active' : 'Inactive' }}</p> <button (click)="toggleStatus(item)">Toggle Status</button> </div> ` }) export class ItemListComponent { items = [ { name: 'Item 1', active: true }, { name: 'Item 2', active: false }, { name: 'Item 3', active: true } ]; toggleStatus(item) { item.active = !item.active; console.log('Updated status for', item.name, 'to', item.active); } } ``` When I click on the button for any item, the status updates correctly in the console, but visually it seems like the status change is propagated to all items instead of just the specific one. Iโ€™ve verified that the `toggleStatus` function is only targeting the clicked item. Iโ€™ve tried moving the function declaration outside of the loop and also checking for any side effects from other parts of my code, but nothing seems to resolve this. Iโ€™m also not using any observables that might be causing this issue. I suspect it could be related to how Angular handles change detection with the `*ngFor` directive, but Iโ€™m not sure how to fix it. Does anyone have insights on why this might be happening and how to properly isolate the function behavior to just the clicked item? This is part of a larger CLI tool I'm building. The stack includes Typescript and several other technologies. What's the correct way to implement this? For reference, this is a production microservice. Cheers for any assistance! Thanks for any help you can provide!