JSFiddle - React, Tailwind, and code Playground

HTML

<div ng-app="app">
    <div ng-controller="ctrl">
        <input ng-keydown="key($event)" />
    </div>
</div>

JavaScript

var app = angular.module("app", []);

app.controller("ctrl", function ($scope) {
    $scope.key = function($event){
        console.log($event.keyCode);
        if ($event.keyCode == 38)
            alert("up arrow");
        else if ($event.keyCode == 39)
            alert("right arrow");
        else if ($event.keyCode == 40)
            alert("down arrow");
        else if ($event.keyCode == 37)
            alert("left arrow");
    }
})