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1angular.module('main.directives')
2
3    /**
4     * Form validation which checks whether 2 model values are the same.
5     */
6    .directive('acMatch', function () {
7        return {
8            restrict: 'A',
9            scope: true,
10            require: 'ngModel',
11            link: function (scope, elem , attrs, control) {
12                var checker = function () {
13 
14                    //get the value of the first password
15                    var e1 = scope.$eval(attrs.ngModel);
16 
17                    //get the value of the other password 
18                    var e2 = scope.$eval(attrs.acMatch);
19                    return e1 === e2;
20                };
21                scope.$watch(checker, function (n) {
22 
23                    //set the form control to valid if both
24                    //passwords are the same, else invalid
25                    control.$setValidity("match", n);
26                });
27            }
28        };
29    });