What's your name?:
<input type="text" ng-model="user.name" />
<button ng-click="greet()">Click here!</button>
<h3>{{ message }}</h3>
var app = angular.module('app', []);
app.controller('MainCtrl', function($scope) {
$scope.greet = function() {
$scope.message = "Hello, " + $scope.user.name;
}
});