Datepicker decorator

by sheilak

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.4.5/angular.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/angular-ui-bootstrap/0.13.3/ui-bootstrap-tpls.js"></script>
<div ng-app="app">
    <datepicker ng-model="dt" />
</div>

JavaScript

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

angular.module('app').service('MyService', function() {
    this.doStuff = function(date) {
        console.log(date);
    }
});

angular.module('app').config(function($provide) {
    $provide.decorator('datepickerDirective', ['$delegate', 'MyService', function($delegate, MyService) {
        var directive = $delegate[0];

        var link = directive.link;

        directive.compile = function() {
            return function(scope, element, attrs, ctrls) {
                link.apply(this, arguments);

                scope.$watch(function() {
                    return ctrls[0].activeDate;
                }, function(oldValue, newValue) {
                    if (oldValue.getMonth() !== newValue.getMonth() 
                       || oldValue.getYear() !== newValue.getYear()) {
                        MyService.doStuff(newValue);
                    }
                }, true);
            }
        };
        return $delegate;
    }]);
});