AngularJS 1.5.x服务未正确绑定,并且未在控制器中更新



由于某些原因,当我更新工厂值时,关联的视图不会更新。我绑定到服务中的一个对象,而不是字符串,所以我看不出我做错了什么,但实现肯定有问题。为了简洁起见,我减少了代码,并将其添加到了一个plunker中。我以为我把服务搞砸了,但显然不是。我甚至重新阅读了这篇文章,以确保我认为我理解的是正确的。

标题的值是第一次提取的,您会看到"欢迎!"在标题中,但之后它不会更新为"下一个!"。

https://plnkr.co/edit/ma1SDJyIKoFPWznXdxTO?p=preview

<!DOCTYPE html>
<html ng-app="app">
<head>
    <html-title></html-title>
</head>
<body>
<main></main>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.5.5/angular.min.js"></script>
<script>
(function () {
    'use strict';
    function MainController(HtmlTitleFactory) {
        HtmlTitleFactory.set('Welcome!'); // title gets set
        // check title was changed
        this.data = HtmlTitleFactory.get();
        setTimeout(function() {
            // updates title
            HtmlTitleFactory.set('Up Next!');
            // title looks to be set, but changes not picked up in view
            console.log(HtmlTitleFactory.get());
        }, 3000);
    }
    MainController.$inject = [
        'HtmlTitleFactory'
    ];
    var main = {
        template: '<div>{{ vm.data.title }}</div>',
        controller: MainController,
        controllerAs: 'vm'
    };
    ////////////////////////////
    function HtmlTitleController(HtmlTitleFactory) {
        var vm = this;
        //vm.title = HtmlTitleFactory.get().title;
        vm.title = HtmlTitleFactory.get();
    }
    HtmlTitleController.$inject = [
        'HtmlTitleFactory'
    ];
    var htmlTitle = {
        template: '<title>{{ vm.title.title }}</title>',
        controller: HtmlTitleController,
        controllerAs: 'vm'
    };
    ////////////////////////////
    function HtmlTitleFactory() {
        var service = {
            title: 'Default'
        };
        function set(title) {
            // originally tried this since bound to object this should work
            // service.title = title;
            // wasn't working so tried this as well
            angular.extend(service, { 
               title: title
            });
        }
        function get() {
            return service;
        }
        return {
            set: set,
            get: get
        };
    }
    HtmlTitleFactory.$inject = [];
    ////////////////////////////
    angular
        .module('app', [])
        .component('main', main)
        .component('htmlTitle', htmlTitle)
        .factory('HtmlTitleFactory', HtmlTitleFactory);
})();
</script>
</body>
</html>

setTimeout是一个事件,它不会告诉angular在角度上下文中发生了更改,因为它是在角度上下文之外运行的自定义事件。在这种情况下,摘要循环不会着火,您需要手动运行它。

理想情况下,您应该使用$timeout,它的工作原理与setTimeout类似,并且在触发回调时运行摘要循环。

$timeout(function() {
   HtmlTitleFactory.set('Up Next!'); // update title
   console.log(HtmlTitleFactory.get()); // title looks to be set but not picked up in view
}, 3000);

Plunkr

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