JSFiddle - React, Tailwind, and code Playground
HTML
<div ng-app="myApp" ng-controller="dummy">
<li id="element1"><a href="#" ng-click="selected = 1">one</a>
<input id="box" type="text" value="" ng-show="selected === 1"></li>
</div>
JavaScript
angular.module('myApp', [])
.controller('dummy', ['$scope', function ($scope) {
$scope.selected = false;
}]);