Steps for creating a button that increments by using ng loop:1. Begin

Question

Steps for creating a button that increments by using ng loop:1. Begin

I am attempting to create a button that can be used to increment and decrement. However, I am facing an issue where all input fields are being affected instead of just one.

This is the code in body.component.html

<div class="items-detail-detail" *ngFor="let detail of card.detail">
<div class="items-detail-information3">
  <div class="btn-block" >
    <button class="btn btn-default" (click)="onDecrement()">
      <i class="material-icons">remove</i>
    </button>
  </div>
  <div class="input-group" >
    <input type="number" value="{{counter}}" class="form-control" style="text-align:center;" >
  </div>
  <div class="btn-block">
    <button class="btn btn-default" (click)="onIncrement()">
      <i class="material-icons">add</i>
    </button>
  </div>

</div>

This is the code in body.component.ts

export class BodyComponent implements OnInit {
  private counter : number = 0; 
    onIncrement() {
      this.counter++
  } 
    onDecrement() {
      this.counter--
  } 
ngOnInit() {
}}

The current behavior of the code is shown in the image below:

enter image description here

When clicking the [+] button at the top, it increments all input fields as shown here:

enter image description here

Apologies for any language barriers, thank you for your assistance.

Appreciate it!

javascript angular typescript

Answer 1

Answer №1

It is essential to keep track of the counter variable for all the cards.

inside body.component.html

<div class="items-detail-detail" *ngFor="let detail of card.detail">
<div class="items-detail-information3">
  <div class="btn-block" >
    <button class="btn btn-default" (click)="onDecrement(detail)">
      <i class="material-icons">remove</i>
    </button>
  </div>
  <div class="input-group" >
    <input type="number" value="{{counter}}" class="form-control" style="text-align:center;" >
  </div>
  <div class="btn-block">
    <button class="btn btn-default" (click)="onIncrement(detail)">
      <i class="material-icons">add</i>
    </button>
  </div>

</div>

within body.component.ts

export class BodyComponent implements OnInit {
    private counter: number = 0;
    onIncrement(item) {
        item.counter = item.counter ? item.counter + 1 : 1;
    }
    onDecrement(item) {
        item.counter = item.counter ? item.counter - 1 : 0;
    }
    ngOnInit() {}
}

Answer 2

It is essential to keep track of the counter variable for all the cards.

inside body.component.html

<div class="items-detail-detail" *ngFor="let detail of card.detail">
<div class="items-detail-information3">
  <div class="btn-block" >
    <button class="btn btn-default" (click)="onDecrement(detail)">
      <i class="material-icons">remove</i>
    </button>
  </div>
  <div class="input-group" >
    <input type="number" value="{{counter}}" class="form-control" style="text-align:center;" >
  </div>
  <div class="btn-block">
    <button class="btn btn-default" (click)="onIncrement(detail)">
      <i class="material-icons">add</i>
    </button>
  </div>

</div>

within body.component.ts

export class BodyComponent implements OnInit {
    private counter: number = 0;
    onIncrement(item) {
        item.counter = item.counter ? item.counter + 1 : 1;
    }
    onDecrement(item) {
        item.counter = item.counter ? item.counter - 1 : 0;
    }
    ngOnInit() {}
}

Answer 3

Answer №2

Your current issue arises from using the same counter for all card details on your site.

<div class="input-group" >
    <input type="number" value="{{counter}}" class="form-control" style="text-align:center;" >
  </div>

To resolve this, consider assigning unique counter values to each individual card for accurate updates.

Answer 4

Your current issue arises from using the same counter for all card details on your site.

<div class="input-group" >
    <input type="number" value="{{counter}}" class="form-control" style="text-align:center;" >
  </div>

To resolve this, consider assigning unique counter values to each individual card for accurate updates.

Answer 5

Answer №3

@Hey there, make sure your detail is defined as a property "counter" so that you can increment this property specifically, instead of a global one.

<div class="items-detail-detail" *ngFor="let detail of card.detail">
   ...
    <!--Remember to pass "detail" as an argument in the button-->
    <button class="btn btn-default" (click)="onDecrement(detail)">
    ...
    <!--Ensure you access detail.counter for the value input field-->
    <input type="number" value="{{detail.counter}}" class="form-control" style="text-align:center;" >
    ...
    <!--Similarly, use onIncrement with detail.counter--->
     <button class="btn btn-default" (click)="onIncrement(detail)">
...
</div>

   //private counter : number = 0;  <--Avoid using a "global" variable
    onIncrement(detail:any) {
      detail.counter++  //<--increment "detail.counter"
  } 
    onDecrement(detail:any) {
      detail.counter-- //<--decrement "detail.counter"
  }

You can simplify the code even further by using:

<button class="btn btn-default" (click)="detail.counter++">
<input type="number" value="{{detail.counter}}">
<button class="btn btn-default" (click)="detail.counter--">

Answer 6

@Hey there, make sure your detail is defined as a property "counter" so that you can increment this property specifically, instead of a global one.

<div class="items-detail-detail" *ngFor="let detail of card.detail">
   ...
    <!--Remember to pass "detail" as an argument in the button-->
    <button class="btn btn-default" (click)="onDecrement(detail)">
    ...
    <!--Ensure you access detail.counter for the value input field-->
    <input type="number" value="{{detail.counter}}" class="form-control" style="text-align:center;" >
    ...
    <!--Similarly, use onIncrement with detail.counter--->
     <button class="btn btn-default" (click)="onIncrement(detail)">
...
</div>

   //private counter : number = 0;  <--Avoid using a "global" variable
    onIncrement(detail:any) {
      detail.counter++  //<--increment "detail.counter"
  } 
    onDecrement(detail:any) {
      detail.counter-- //<--decrement "detail.counter"
  }

You can simplify the code even further by using:

<button class="btn btn-default" (click)="detail.counter++">
<input type="number" value="{{detail.counter}}">
<button class="btn btn-default" (click)="detail.counter--">

Steps for creating a button that increments by using ng loop:1. Begin

Answer №1

inside body.component.html

within body.component.ts

Answer №2

Answer №3

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