How to bind default value in mat-radio-group angular reactive forms

In my case it needs to active option 01 as default selection. It is working with checked=true property, but value is not binding with the formControlName="options", it is binding when user select any option. if no any user selection options value shows as "null".

  <div class="row">
      <mat-radio-group formControlName="options">
        <mat-radio-button checked=true  value="1">Option 01</mat-radio-button>
        <mat-radio-button  value="2">Option 02</mat-radio-button>
      </mat-radio-group>
    </div>

Please kindly help me to resolve this issue. Thank you.

What you want to do is to remove the checked and instead set the preselected value to your formControl, so when you build your form:

constructor(private fb: FormBuilder) { 
  this.myForm = this.fb.group({
    options: ['1']
  })
}

and then you just remove the checked attribute:

<mat-radio-group formControlName="options">
  <mat-radio-button value="1">Option 01</mat-radio-button>
  <mat-radio-button  value="2">Option 02</mat-radio-button>
</mat-radio-group>

Alternate way:

 this.optionFormGroup = new FormGroup({
  options: new FormControl('1'); // the value type (string) should match
 })

--

  <div class="row" [formGroup]="optionFormGroup">
   <mat-radio-group formControlName="options">
     <mat-radio-button checked value="1">Option 01</mat-radio-button>
     <mat-radio-button  value="2">Option 02</mat-radio-button>
   </mat-radio-group>
  </div>

This will default select "yes" option from radio button options.

  <form [formGroup]="optionsFormGroup">
        <mat-grid-list cols="1" rowHeight="75px">
          <mat-grid-tile>
            <label>Option</label>
            <mat-radio-group formControlName="statusOptions" class="m-l-5">
              <mat-radio-button class="m-r-5" value="yes">Yes</mat-radio-button>
              <mat-radio-button class="m-r-5" value="no">No</mat-radio-button>
            </mat-radio-group>
            <mat-icon class="info-icon">help_outline
            </mat-icon>
          </mat-grid-tile>
        </mat-grid-list>
    </form>

initFormControls() {
    this.optionsFormGroup = this.formBuilder.group({
      statusOptions: ['yes'],
    });
  }