$document click

http://angularjs.org/

HTML

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.3/angular.min.js"></script>
<div ng-controller="myCtrl">
     <h1 id="as">foo = {{foo}}</h1>

    <form name="form"></form>
</div>

JavaScript

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

angular.module('app').controller('myCtrl', function ($scope, $document) {
    $scope.foo = 'bar';
    var self = $scope;
    $document.bind('click',"#as", function (event) {
        alert('clicked');
        self.$apply(function () {
            self.foo = 'clicked';
        });
    });
});