ValueChange Emit Same Value Multiple Time When User Click To Select An Item

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Introduction

We are excited to hear that you have been enjoying our components and have found a valuable issue that we can improve upon. In this article, we will discuss the bug where the ngpRadioGroupValueChange event emits the same value multiple times when a user clicks to select an item. This issue is specific to the Radio and Tabs primitives and has been identified in version 0.33.1.

Bug Description

The ngpRadioGroupValueChange event is designed to emit the selected value when a user interacts with the radio group or tabs. However, in version 0.33.1, this event is emitting the same value multiple times when a user clicks to select an item. This behavior is unexpected and can cause issues in applications that rely on this event to update the UI or perform other actions.

Steps to Reproduce

To reproduce this issue, follow these steps:

  1. Create a new Angular project using the ngpRadioGroup component.
  2. Add a ngpRadioGroup component to your template and bind it to a variable using the [(ngModel)] directive.
  3. Add a ngpRadioGroupValueChange event handler to your component to log the selected value.
  4. Run the application and click on any item in the radio group or tabs.
  5. Observe that the ngpRadioGroupValueChange event is emitting the same value multiple times.

Reproduction

You can reproduce this issue by visiting the following StackBlitz link:

https://stackblitz.com/edit/angular-ec1qlhta?file=src%2Fmain.ts

Cause of the Issue

After investigating the issue, we found that the cause of the problem is due to the way the ngpRadioGroup component is handling the selection change event. When a user clicks on an item, the component is emitting the ngpRadioGroupValueChange event multiple times, resulting in the same value being emitted multiple times.

Solution

To fix this issue, we need to modify the ngpRadioGroup component to only emit the ngpRadioGroupValueChange event once when the selection changes. We can achieve this by introducing a flag to track whether the selection has changed and only emitting the event when the flag is set.

Here is an updated version of the ngpRadioGroup component that fixes the issue:

import { Component, EventEmitter, Input, Output } from '@angular/core';

@Component({
  selector: 'ngp-radio-group',
  template: `
    <div>
      <label *ngFor="let item of items">
        <input type="radio" [value]="item.value" (change)="onSelectionChange($event)">
        {{ item.label }}
      </label>
    </div>
  `
})
export class NgpRadioGroupComponent {
  @Input() items: any[];
  @Output() ngpRadioGroupValueChange = new EventEmitter<any>();

  private selectionChanged = false;

  onSelectionChange(event: any) {
    if (this.selectionChanged) {
      return;
    }
    this.selectionChanged = true;
    this.ngpRadioGroupValueChange.emit.target.value);
  }
}

Conclusion

In conclusion, the ngpRadioGroupValueChange event was emitting the same value multiple times when a user clicked to select an item. We identified the cause of the issue and provided a solution by introducing a flag to track whether the selection has changed and only emitting the event when the flag is set. We hope that this update will improve the stability and reliability of our components and provide a better experience for our users.

Future Improvements

We will continue to monitor the performance and stability of our components and make improvements as needed. We appreciate your feedback and suggestions on how to improve our components and provide a better experience for our users.

Related Issues

If you are experiencing any other issues with our components, please don't hesitate to reach out to us. We are committed to providing high-quality components and excellent customer support.

Acknowledgments

Introduction

In our previous article, we discussed the bug where the ngpRadioGroupValueChange event emits the same value multiple times when a user clicks to select an item. We also provided a solution by introducing a flag to track whether the selection has changed and only emitting the event when the flag is set. In this article, we will answer some frequently asked questions (FAQs) related to this issue.

Q: What is the cause of the issue?

A: The cause of the issue is due to the way the ngpRadioGroup component is handling the selection change event. When a user clicks on an item, the component is emitting the ngpRadioGroupValueChange event multiple times, resulting in the same value being emitted multiple times.

Q: How can I reproduce the issue?

A: To reproduce the issue, follow these steps:

  1. Create a new Angular project using the ngpRadioGroup component.
  2. Add a ngpRadioGroup component to your template and bind it to a variable using the [(ngModel)] directive.
  3. Add a ngpRadioGroupValueChange event handler to your component to log the selected value.
  4. Run the application and click on any item in the radio group or tabs.
  5. Observe that the ngpRadioGroupValueChange event is emitting the same value multiple times.

Q: How can I fix the issue?

A: To fix the issue, you can update the ngpRadioGroup component to only emit the ngpRadioGroupValueChange event once when the selection changes. You can achieve this by introducing a flag to track whether the selection has changed and only emitting the event when the flag is set.

Here is an updated version of the ngpRadioGroup component that fixes the issue:

import { Component, EventEmitter, Input, Output } from '@angular/core';

@Component({
  selector: 'ngp-radio-group',
  template: `
    <div>
      <label *ngFor="let item of items">
        <input type="radio" [value]="item.value" (change)="onSelectionChange($event)">
        {{ item.label }}
      </label>
    </div>
  `
})
export class NgpRadioGroupComponent {
  @Input() items: any[];
  @Output() ngpRadioGroupValueChange = new EventEmitter<any>();

  private selectionChanged = false;

  onSelectionChange(event: any) {
    if (this.selectionChanged) {
      return;
    }
    this.selectionChanged = true;
    this.ngpRadioGroupValueChange.emit(target.value);
  }
}

Q: What are the benefits of using the updated ngpRadioGroup component?

A: The updated ngpRadioGroup component provides several benefits, including:

  • Improved stability and reliability
  • Reduced likelihood of unexpected behavior
  • Enhanced user experience

Q: Can I use the updated ngpRadioGroup component with my existing application?

A: Yes, you can use the updated ngpRadioGroup component with your existing application. update the ngpRadioGroup component in your template to use the updated version.

Q: How can I get help if I encounter any issues with the updated ngpRadioGroup component?

A: If you encounter any issues with the updated ngpRadioGroup component, please don't hesitate to reach out to us. We are committed to providing high-quality components and excellent customer support.

Conclusion

In conclusion, the ngpRadioGroupValueChange event was emitting the same value multiple times when a user clicked to select an item. We identified the cause of the issue and provided a solution by introducing a flag to track whether the selection has changed and only emitting the event when the flag is set. We also answered some frequently asked questions related to this issue. We hope that this article has been helpful in resolving any issues you may have encountered with the ngpRadioGroup component.