<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <title>What is ng-keyup  directive? Why we use it?</title>
    <script src="https://code.angularjs.org/1.4.1/angular.js"></script>
    <script>
        var app = angular.module('myApp', []);
        app.controller('ngClickCtrl', function ($scope) {
            $scope.firstName = "Anil";
            $scope.lastName = "Singh";
            $scope.IsActive = false;
            $scope.keyup = function (IsActive) {
                if (!IsActive) {
                    $scope.IsActive = true;
                } else {
                    $scope.IsActive = false;
                }
            };
        });
    </script>
</head>
<body ng-app="myApp">
    <div ng-controller="ngClickCtrl">
        <div>
            First Name:<input type="text" ng-model="firstName" ng-keyup="keyup(IsActive)"> 
            Last Name: <input type="text" ng-model="lastName" ng-keyup="keyup(IsActive)">         
        </div>
        <div>
            <div ng-show="IsActive"> <h3>Full Name: {{firstName + " " + lastName}} </h3></div>
        </div>
    </div>
</body>
</html>

// Code goes here


/* Styles go here */