How to set radio button checked in Angular 2

Question

I am new to Angular 2.

I have a list and iterate it and display as radio buttons as shown below. Now I want to set the check property if condition is TRUE. How to

Answer 1

You can use it like this

<input type="radio" name="optradio" [checked]="savedVal == currentRadioVal ? true : false" >  

Answer 2

try this

<table *ngIf="optionList">  
    <tr *ngFor="let op of optionList; let i = index">
      <td>
          <input type="radio" name="optradio" [checked]=" (CONDITION HERE)"> 
          <label>{{op.option_text}} </label> 
      <td>
    </tr>
</table>

Online demo: https://embed.plnkr.co/jSht4Do3DzpoVQG2SAwl/

Answer 3

<input type="radio" name='{{prod.configurationItem}}' value = '{{prod.additionalCost}}' [checked] = "prod.isDefault == 'Y' ? true : false"> prod is object item