JSFiddle - React, Tailwind, and code Playground

HTML

<div ng-app ng-controller="Controller">
    <select ng-model="myDropDown">
          <option value="one">One</option>
          <option value="two">Two</option>
          <option value="three">Three</option>
    </select>
    
    <input ng-show="myDropDown=='two'" type="text">
</div>

JavaScript

function Controller ($scope) {
    $scope.myDropDown = 'one';
}