Angular 5 Reactive Forms - Radio Button Group

I have 2 radio buttons, I'm using reactive forms and I have added the form controls within my component. The issue I am facing is that the name attribute has to be the same as the formControlName. When I set the name attribute as the same, I can only select 1 radio button -- can never unselect and select the other one. Only allows me to select the same one.

this.genderControl = new FormControl("", Validators.required);

and then added to my Form Group

genderControl: this.genderControl,

My HTML:

<div class="radio-inline">
  <input id="gender" type="radio" name="genderControl" formControlName="genderControl" />
  <label class="radio-label"> Male</label>
  <input id="gender" type="radio" name="genderControl" formControlName="genderControl" />
  <label class="radio-label">Female</label>
</div>

Form Group

    this.personalInfo = new FormGroup({
  searchControl: this.searchControl,
  titleControl: this.titleControl,
  firstNameControl: this.firstNameControl,
  middleNameControl: this.middleNameControl,
  lastNameControl: this.lastNameControl,
  birthdayControl: this.birthdayControl,
  genderControl: this.genderControl,
  phoneControl: this.phoneControl,
  taxCanadaControl: this.taxCanadaControl,
  provinceControl: this.provinceControl,
  countryControl: this.countryControl,
  taxCountryControl: this.taxCountryControl,

  creditControl: this.creditControl
});

I tried your code, you didn't assign/bind a value to your formControlName.

In HTML file:

<form [formGroup]="form">
   <label>
     <input type="radio" value="Male" formControlName="gender">
       <span>male</span>
   </label>
   <label>
     <input type="radio" value="Female" formControlName="gender">
       <span>female</span>
   </label>
</form>

In the TS file:

  form: FormGroup;
  constructor(fb: FormBuilder) {
    this.name = 'Angular2'
    this.form = fb.group({
      gender: ['', Validators.required]
    });
  }

Make sure you use Reactive form properly: [formGroup]="form" and you don't need the name attribute.

In my sample. words male and female in span tags are the values display along the radio button and Male and Female values are bind to formControlName

See the screenshot:

To make it shorter:

<form [formGroup]="form">
  <input type="radio" value='Male' formControlName="gender" >Male
  <input type="radio" value='Female' formControlName="gender">Female
</form>

Hope it helps:)

IF you want to derive usg Boolean true False need to add "[]" around value

<form [formGroup]="form">
  <input type="radio" [value]="true" formControlName="gender">Male
  <input type="radio" [value]="false" formControlName="gender">Female
</form>