NgxInputCounter

The input number with counter for Angular

Getting Started

Versions

Angular	ngx-input-counter
>=16.0.0	v1.0.x
>=15.0.0	v0.0.x

Instalation

npm i ngx-input-counter

Usage

NgModule: Import the module

import { NgxInputCounterModule } from 'ngx-input-counter';
@NgModule({
  ...
  imports: [
    ...,
    NgxInputCounterModule,
  ],
})

Standalone: Import the component, optional: if you are using the directives

import { NgxInputCounterComponent } from 'ngx-input-counter';
@NgModule({
  ...
  imports: [
    ...,
    NgxInputCounterComponent,
    PlusContentDirective,
    MinusContentDirective,
  ],
})

Use in your components

<ngx-input-counter [(ngModel)]="qty"></ngx-input-counter>

Props

Name	Type	Default	Description
value	number	0	Initial state of the toggle button
min	number	-Infinity	Transition time for the animation
max	number	Infinity	Transition time for the animation
step	number	1	Transition time for the animation
minusTemplate	TemplateRef	-	Pass a TemplateRef to replace the minus button content
plusTemplate	TemplateRef	+	Pass a TemplateRef to replace the plus button content
minusComponent	Type	undefined	Pass a Component to replace the minus button content
plusComponent	Type	undefined	Pass a Component to replace the plus button content
minusClass	string	'ngx-input-counter-button'	Classes of the minus button
plusClass	string	'ngx-input-counter-button'	Classes of the plus button
valueClass	string	'ngx-input-counter-value'	Classes of value text
disabled	boolean	false	Disables the buttons

Outputs

Name	Payload	Description
change	value	Triggered when state of the component changes. Contains: value - state of the component

Styling

You can use the default classes and add your own styles or using a custom class:

The classes in the component are:

• ngx-input-counter-container: The container element.
• ngx-input-counter-button: The buttons element.
• ngx-input-counter-value: The value element .

ngx-input-counter.custom {
  .ngx-input-counter-container {
    border-radius: 50px;
    text-align: center;
    .ngx-input-counter-value {
      width: 30px;
      font-weight: bold;
      font-size: 18px;
    }
  }
  .ngx-input-counter-button {
    border: 1px solid #999;
    border-radius: 100%;
    background-color: white;
    width: 36px;
    height: 36px;
    text-align: center;
    font-weight: 600;
    font-size: 20px;
    cursor: pointer;
    transition: all 0.5s ease;
    &:hover {
      background-color: #ddd;
      box-shadow: 1px 1px 2px 1px #ccc;
    }
  }
}

Then in your component:

<ngx-input-counter [(ngModel)]="qty" class="custom"></ngx-input-counter>

You can use the Input props minusClass, plusClass and valueClass to override the default value class and use your own classes, this is usefull if you are using CSS frameworks.

<ngx-input-counter
  ...
  minusClass="btn btn-info"
  plusClass="btn btn-primary"
></ngx-input-counter>

If you want to use custom icons in the counter buttons use the minusTemplate and plusTemplate passing a TemplateRef with the content you want to show

<ng-template #plusTemplate>
  <svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke-width="1.5" stroke="currentColor">
    <path stroke-linecap="round" stroke-linejoin="round" d="M12 4.5v15m7.5-7.5h-15" />
  </svg>
</ng-template>
<ng-template #minusTemplate>
  <svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke-width="1.5" stroke="currentColor">
    <path stroke-linecap="round" stroke-linejoin="round" d="M19.5 12h-15" />
  </svg>
</ng-template>

<ngx-input-counter
  class="custom-class"
  [plusTemplate]="plusTemplate"
  [minusTemplate]="minusTemplate"
></ngx-input-counter>

You can use the slot, using minus for the minusTemplate and plus for the plusTemplate slot

<ngx-input-counter>
  <ng-template plus>
    <svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke-width="1.5" stroke="currentColor">
      <path stroke-linecap="round" stroke-linejoin="round" d="M12 4.5v15m7.5-7.5h-15" />
    </svg>
  </ng-template>
  <ng-template minus>
    <svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke-width="1.5" stroke="currentColor">
      <path stroke-linecap="round" stroke-linejoin="round" d="M19.5 12h-15" />
    </svg>
  </ng-template>
</ngx-input-counter>

When you use the slot template you can pass classes to override the button class:

<ng-template minus class="rounded p-4">
  <svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke-width="1.5" stroke="currentColor">
    <path stroke-linecap="round" stroke-linejoin="round" d="M19.5 12h-15" />
  </svg>
</ng-template>

Global Configuration

You can configure all ngx-input-counter components in your app using the NgxInputCounterService provider. This allows you to set default values for all instances of ngx-input-counter throughout your application.

constructor (private config: NgxInputCounterService) {
  this.config.min = 0
  this.config.valueClass = 'p-2 border border-gray-400 font-monospace'
  this.config.minusClass = 'btn border-gray-400 rounded-l-md opacity-50 hover:opacity-40'
  this.config.plusClass = 'btn border-gray-400 rounded-r-md opacity-50 hover:opacity-40'
}

These settings will apply to all ngx-input-counter components in your application. However, you can still override individual values directly through their input properties in your templates.

Advanced Customization

For more advanced use cases, you can use the plusComponent and minusComponent properties to define custom components for the plus and minus buttons:

constructor (private config: NgxInputCounterService) {
  ...
  this.config.minusComponent = MinusTemplateComponent;
  this.config.plusComponent = PlusTemplateComponent;
}

This is useful when you have dynamic or reusable templates for your button content and want to configure them globally via the service.

Extending the Component

Another powerful way to customize ngx-input-counter is by extending the NgxInputCounterComponent itself. This allows you to create your own custom input counter component, add new properties, and directly modify the button content templates within your extended component.

@Component({
  selector: 'app-input-counter',
  standalone: true,
  imports: [NgxInputCounterComponent],
  template: `
    <ng-template #plusTemplateIcon>
      <svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke-width="1.5" stroke="currentColor">
        <path stroke-linecap="round" stroke-linejoin="round" d="M12 4.5v15m7.5-7.5h-15" />
      </svg>
    </ng-template>
    <ng-template #minusTemplateIcon let-step="step" let-min="min" let-value="value">
      @if (value !== min + step) {
      <svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke-width="1.5" stroke="currentColor">
        <path stroke-linecap="round" stroke-linejoin="round" d="M19.5 12h-15" />
      </svg>
      } @else {
      <svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke-width="1.5" stroke="#EF2F35">
        <path stroke-linecap="round" stroke-linejoin="round" d="M14.74 9l-.346 9m-4.788 0L9.26 9m9.968-3.21c.342.052.682.107 1.022.166m-1.022-.165L18.16 19.673a2.25 2.25 0 01-2.244 2.077H8.084a2.25 2.25 0 01-2.244-2.077L4.772 5.79m14.456 0a48.108 48.108 0 00-3.478-.397m-12 .562c.34-.059.68-.114 1.022-.165m0 0a48.11 48.11 0 013.478-.397m7.5 0v-.916c0-1.18-.91-2.164-2.09-2.201a51.964 51.964 0 00-3.32 0c-1.18.037-2.09 1.022-2.09 2.201v.916m7.5 0a48.667 48.667 0 00-7.5 0" />
      </svg>
      }
    </ng-template>
    <ngx-input-counter class="custom-plus" style="margin: auto;"
      [plusTemplate]="plusTemplateIcon"
      [minusTemplate]="minusTemplateIcon"
      [min]="min"
      [max]="max"
      [step]="step"
      [value]="value"
      [disabled]="disabled"
      (change)="onInput($event)"
    >
    </ngx-input-counter>
  `,
  providers: [
    {
      provide: NG_VALUE_ACCESSOR,
      useExisting: forwardRef(() => AppCounterComponent),
      multi: true
    }
  ]
})
export class AppCounterComponent extends NgxInputCounterComponent {}

By creating your own component that extends the original, you can:

• Add custom inputs and behavior
• Override the button content templates
• Fully customize the appearance and functionality

You can then use <app-input-counter> instead of <ngx-input-counter> in your templates.

![NOTE] If you plan to use your extended component with Angular Forms, don't forget to provide the NG_VALUE_ACCESSOR

  providers: [
    {
      provide: NG_VALUE_ACCESSOR,
      useExisting: forwardRef(() => AppCounterComponent),
      multi: true
    }
  ]

This ensures your custom counter component works properly with ngModel or reactive forms.

Development

Clone this repo and install the dependencies. Run ng serve for a dev server. Navigate to http://localhost:4200/. The application will automatically reload if you change any of the source files.

Running unit tests

Run ng test to execute the unit tests via Karma.

Running end-to-end tests

Run ng e2e to execute the end-to-end tests via a platform of your choice. To use this command, you need to first add a package that implements end-to-end testing capabilities.

Contributing

See Contributing Guide.

License

MIT