angularjs - 在 Controller 和 Factory 之间共享一个变量

Question

我在控制器中定义了一个变量 $scope.name ，我将其传递给工厂 MyService 作为

$scope.name = MyService.name;

厂内有

var myserivce = {};
myservice.open = function() {
    myservice.name = 'abc';
};
return myservice;

我想返回 myservice.name 以便 abc 存储在 $scope.name

我该怎么做？不使用 rootScope

标签： angularjs

Answer 1

如果我正确理解了您的问题，那么您想要的是控制器知道名称变量在服务中已更改，并且应基于此更新视图。

这可以通过以下 3 种方式之一完成：

1. 使用 rootScope - 不好的方式
2. 使用观察者 - 好的方式
3. 使用发布/订阅模型

angular
	.module("myApp", [])
	.controller("CtrlList", CtrlList)
	.service("MyService", MyService);

CtrlList.$inject = ["$scope", "MyService"];
MyService.$inject = ["$q", "$timeout"];

function CtrlList($scope, MyService) {
	
	MyService.name.subscribe(function(name) {
		$scope.name = name;
	});

	$scope.$watch(
		function() {
			return MyService.age;
		},
		function(newValue, oldValue) {
			$scope.age = MyService.age;
			console.log(newValue + " " + oldValue);
			console.log(MyService.age);
		}
	);

	MyService.open();
}

function MyService($q, $timeout) {
	var myservice = { name: new rxjs.Subject(), age: 1 };

	myservice.open = function() {
		$timeout(function() {
			myservice.name.next("Value Changed.");
			myservice.age = 2;
		}, 10000);
		myservice.name.next("Initial Value.");
	};

	return myservice;
}

* {
  font-family: "Work Sans";
  padding: 0;
  margin: 0;
}

body {
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  background: #F6F7EB;
}

.wrapper {
  width: 500px;
  border: 1px dotted gray;
  padding: 10px;
}
.wrapper .heading {
  font-size: 30px;
  margin-bottom: 12px;
}
.wrapper p {
  margin-bottom: 6px;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/rxjs/6.3.3/rxjs.umd.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.7.5/angular.min.js"></script>
<link href='https://fonts.googleapis.com/css?family=Work+Sans:400' rel='stylesheet' type='text/css'>
<section class="wrapper">
  <p class="heading">AngularJS v1.7.5 - Wait for 10 seconds to see changes</p>
  <div ng-app="myApp">
    <div class="container" ng-controller="CtrlList">
      <p>This value is changed through rxjs   : {{ name }}</p>
      <p>This value is changed through watcher: {{ age }}</p>
    </div>
  </div>
</section>