JSFiddle - React, Tailwind, and code Playground

HTML

<div ng-app>
    <div ng-controller="SelectCtrl">
        <select id="selectRate" selectmodel="rate" ng-model="rate" ng-options="ft.id as ft.name for ft in rateChart">
        </select>
    </div>
</div>

JavaScript

function SelectCtrl($scope,$interval) {
   $scope.rateChart = [
       {id: 'S', name: 'buy rate'},
       {id: 'K', name: 'sell rate'},
       {id: 'R', name: 'average rate'}
   ];
    
   setInterval(function(){        
       $scope.$apply();
   }, 2000);
}