$scope.$watch 使用棱角材料

想要在有人关闭表单（在侧导航中）时更改路由（ui.router）。

当我单击取消所有工作时，都会返回根网址，但是当我单击页面上的任何位置并且侧导航关闭时，我停留在/new 上。

我是棱角和棱角材料的新手

(function () {
"use strict";
angular
        .module("ngClassifieds")
        .controller('newClassifiedsCtrl', function ($mdSidenav, $state , $mdDialog, classifiedsFactory, $timeout, $scope){
            var vm = this;
            vm.closeSidebar = closeSidebar;
            $timeout(function(){
                $mdSidenav('left').open();
            });
            $scope.$watch('vm.sidenavOpen', function(sidenav){
                if(sidenav === false){
                    $mdSidenav('left')
                            .close()
                            .then(function(){
                                $state.go('classifieds');
                            });
                }
            });
            function closeSidebar() {
                vm.sidenavOpen = false;
            }
})
})();

并在模板中

<md-sidenav class="md-sidenav-left md-whiteframe-z2"
        md-component-id="left"
        md-is-open="vm.sidenavOpen">
<md-toolbar>
    <h1 class="md-toolbar-tools">Add a Classified</h1>
</md-toolbar>
<md-content layout-padding>
    <form>
        <md-input-container>
            <label for="title">Title</label>
            <input type="text"
                   id="title"
                   md-auto-focus
                   ng-model="classified.title">
        </md-input-container>
        <md-input-container>
            <label for="price">Price</label>
            <input type="text"
                   id="price"
                   ng-model="classified.price">
        </md-input-container>
        <md-input-container>
            <label for="description">Description</label>
        <textarea id="description"
                  ng-model="classified.description"></textarea>
        </md-input-container>
        <md-input-container>
            <label for="image">Image Link</label>
            <input type="text"
                   id="image"
                   ng-model="classified.image">
        </md-input-container>
        <md-button class="md-primary"
                   ng-click="vm.saveClassified(classified)"
                   ng-if="!editing">
            Save
        </md-button>
        <md-button ng-if="editing"
                   class="md-primary"
                   ng-click="vm.saveEdit()">
            Save Edit
        </md-button>
        <md-button class="md-warn" ng-click="vm.closeSidebar()">
            Cancel
        </md-button>
        <pre>{{ classified | json }}</pre>
    </form>
</md-content>