Demonstrates how you can use ngModel and ngChange in Angular 1.5 components

ngModelAndChangeDemo.js

angular.module('demo', [])
    .component('inputDemo', {
        require: {
            parent: '^ngModel'
        },
        template: '<input ng-model="$ctrl.text" /><button ng-click="$ctrl.update()">change</button>',
        controller: function($timeout) {
            var $ctrl = this;

            $ctrl.text;

            $ctrl.$onInit = function() {
                $timeout(function() {
                    $ctrl.text = $ctrl.parent.$modelValue;
                }, 0);
            };

            $ctrl.update = function() {
                $ctrl.parent.$setViewValue($ctrl.text);
            };
        }
    })
    .controller('DemoCtrl', function() {
        var $ctrl = this;

        $ctrl.foo = 'hello';

        $ctrl.func = function(text) {
            console.log(text);
        }
    });

view.html

<div ng-app="demo" ng-controller="DemoCtrl as $ctrl">
    <input-demo ng-model="$ctrl.foo" ng-change="$ctrl.func($ctrl.foo)"></input-demo>
    {{$ctrl.foo}}
</div>