Angular PrimeNG RadioButton Component

Angular PrimeNG is an open-source framework with a rich set of native Angular UI components that are used for great styling and this framework is used to make responsive websites with very much ease. In this article, we will know how to use the RadioButton component in Angular PrimeNG.

RadioButton component: It allows the user to select one option at a time from a set.

Properties:

• name: It is used to set the name of the radiobutton group. It is of string data type, the default value is null.
• value: It is used to set the value of the radiobutton. It is of string data type, the default value is null.
• label: It is used to set the label of the radiobutton. It is of string data type, the default value is null.
• disabled: It specifies that the element should be disabled, It is of the boolean data type, the default value is false.
• tabindex: It is used to set the index of the element in tabbing order. It is of number datatype, the default value is null.
• inputId: It is an ID identifier of the underlying input element. It is of string data type, the default value is null.
• ariaLabelledBy: It is the ariaLabelledBy property that establishes relationships between the component and label(s) where its value should be one or more element IDs. It is of string data type, the default value is null.
• style: It is used to set the inline style of the element. It is of object data type, the default value is null.
• styleClass: It is used to set the style class of the element. It is of string data type, the default value is null.
• ariaLabel: It is used to define a string that labels the input element. It is of string data type, the default value is null.
• labelStyleClass: It is used to set the style class of the label. It is of string data type, the default value is null.

Events:

• onClick: It is a callback that is fired on radio button click.
• onFocus: It is a callback that is fired when the radio button receives focus.
• onBlur: It is a callback that is fired when the radio button loses focus.

Methods:

• focus: This method is used to apply focus on the element.

Styling: 

• p-radiobutton: It styles the container element.
• p-radiobutton-box: It styles the container of icons.
• p-radiobutton-icon: It styles the icon element.
• p-chkbox-label: It styles the label element.
• p-label-active: It styles the label element of a checked state.
• p-label-focus: It styles the label element of a focused state.
• p-label-disabled: It styles the label element of a disabled state.

Creating Angular Application & module installation:

• Step 1: Create an Angular application using the following command.

  ng new appname

• Step 2: After creating your project folder i.e. appname, move to it using the following command.

  cd appname

• Step 3: Install PrimeNG in your given directory.

  npm install primeng --save
  npm install primeicons --save

Project Structure: It will look like the following.

Example 1: This basic example illustrates the use of the RadioButton component without a preselected value.

app.component.html

<h2>GeeksforGeeks</h2>
<h5>PrimeNG RadioButton component</h5>
<div class="p-field-radiobutton">
  <p-radioButton value="AngularJS"
                   [(ngModel)]=" gfg"
                 inputId=" gfg1">
  </p-radioButton>
  <label for=" gfg1">AngularJS</label>
</div>
<div class="p-field-radiobutton">
  <p-radioButton value="ReactJS"
                 [(ngModel)]=" gfg"
                 inputId=" gfg2">
  </p-radioButton>
  <label for=" gfg2">ReactJS</label>
</div>
<div class="p-field-radiobutton">
  <p-radioButton value="HTML"
                 [(ngModel)]=" gfg"
                 inputId="gfg3">
  </p-radioButton>
  <label for="gfg3">HTML</label>
</div>
<div class="p-field-radiobutton">
  <p-radioButton value="JavaScript"
                 [(ngModel)]=" gfg"
                 inputId=" gfg4">
  </p-radioButton>
  <label for=" gfg4">JavaScript</label>
</div>

app.component.ts

import { Component } from '@angular/core';

@Component({
  selector: 'my-app',
  templateUrl: './app.component.html'
})
export class AppComponent {
  gfg: string;
}

app.module.ts

import { NgModule } from '@angular/core';
import { BrowserModule }
    from '@angular/platform-browser';
import { FormsModule } from '@angular/forms';
import { BrowserAnimationsModule }
    from '@angular/platform-browser/animations';
import { AppComponent } from './app.component';
import { RadioButtonModule } from 'primeng/radiobutton';

@NgModule({
  imports: [
    BrowserModule,
    BrowserAnimationsModule,
    RadioButtonModule,
    FormsModule
  ],
  declarations: [AppComponent],
  bootstrap: [AppComponent]
})
export class AppModule {}

Output:

Example 2: In this example, we are building a radioButton Group dynamically with the pre-selected value. 

app.component.html

<h2>GeeksforGeeks</h2>
<h5>PrimeNG RadioButton Component</h5>
<div *ngFor="let a of gfg" class="p-field-checkbox">
  <p-radioButton [value]="a" [(ngModel)]="selected">
  </p-radioButton>
  <label [for]="a.key">{{a.name}}</label>
</div>

app.component.ts

import { Component } from '@angular/core';

@Component({
  selector: 'my-app',
  templateUrl: './app.component.html'
})
export class AppComponent {
  selected: any = null;

  gfg: any[] = [
    { name: 'A' },
    { name: 'B' },
    { name: 'C' },
    { name: 'D' },
    { name: 'E' }
  ];

  ngOnInit() {
    this.selected = this.gfg[0];
  }
}

app.module.ts

import { NgModule } from '@angular/core';
import { BrowserModule }
    from '@angular/platform-browser';
import { FormsModule } from '@angular/forms';
import { BrowserAnimationsModule }
    from '@angular/platform-browser/animations';
import { AppComponent } from './app.component';
import { RadioButtonModule } from 'primeng/radiobutton';

@NgModule({
  imports: [
    BrowserModule,
    BrowserAnimationsModule,
    RadioButtonModule,
    FormsModule
  ],
  declarations: [AppComponent],
  bootstrap: [AppComponent]
})
export class AppModule {}

Output:

Reference: https://primefaces.org/primeng/showcase/#/radiobutton