AngularJS empty fiddle

AngularJS empty fiddle

HTML

<div ng-app="myApp">
    <input type='text' ng-model='data'/>
    <div ng-controller='Ctrl'>
        <button ng-click='getData()' ng-show='!!data'>Get Data Value</button>
    </div>
</div>

JavaScript

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

app.controller('Ctrl',['$scope','$rootScope',function($scope,$rootScope) {
    debugger;
    $scope.getData=function() {
        alert($rootScope.data);
    }
}]);