AngularJS:如何在控制器之间传递变量? [英] AngularJS: How can I pass variables between controllers?

问题描述

我有两个 Angular 控制器:

I have two Angular controllers:

function Ctrl1($scope) {
    $scope.prop1 = "First";
}

function Ctrl2($scope) {
    $scope.prop2 = "Second";
    $scope.both = Ctrl1.prop1 + $scope.prop2; //This is what I would like to do ideally
}

我不能在 Ctrl2 中使用 Ctrl1 因为它是未定义的.但是，如果我尝试像这样传递它......

I can't use Ctrl1 inside Ctrl2 because it is undefined. However if I try to pass it in like so…

function Ctrl2($scope, Ctrl1) {
    $scope.prop2 = "Second";
    $scope.both = Ctrl1.prop1 + $scope.prop2; //This is what I would like to do ideally
}

出现错误.有人知道怎么做吗?

I get an error. Does anyone know how to do this?

在做

Ctrl2.prototype = new Ctrl1();

也失败了.

注意:这些控制器没有相互嵌套.

NOTE: These controllers are not nested inside each other.

推荐答案

跨多个控制器共享变量的一种方法是 创建一个服务并将它注入到任何你想使用它的控制器中.

One way to share variables across multiple controllers is to create a service and inject it in any controller where you want to use it.

简单服务示例:

angular.module('myApp', [])
    .service('sharedProperties', function () {
        var property = 'First';

        return {
            getProperty: function () {
                return property;
            },
            setProperty: function(value) {
                property = value;
            }
        };
    });

在控制器中使用服务:

function Ctrl2($scope, sharedProperties) {
    $scope.prop2 = "Second";
    $scope.both = sharedProperties.getProperty() + $scope.prop2;
}

这在本博客(第 2 课尤其是).

This is described very nicely in this blog (Lesson 2 and on in particular).

我发现，如果您想跨多个控制器绑定到这些属性，最好绑定到对象的属性而不是原始类型(布尔值、字符串、数字)以保留绑定引用.

I've found that if you want to bind to these properties across multiple controllers it works better if you bind to an object's property instead of a primitive type (boolean, string, number) to retain the bound reference.

示例:var property = { Property1: 'First' }; 而不是 var property = 'First';.

更新:(希望)让事情更清楚这里有一个小提琴a> 显示以下示例:

UPDATE: To (hopefully) make things more clear here is a fiddle that shows an example of:

• 绑定到共享值的静态副本(在 myController1 中)
  • 绑定到原语(字符串)
  • 绑定到对象的属性(保存到作用域变量)
  • 绑定到返回原始(字符串)的函数
  • 绑定到对象的属性
  • 双向绑定对象的属性

  这篇关于AngularJS:如何在控制器之间传递变量?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！