Angular JS 将子作用域变量更改传播到父作用域 [英] Angular JS propagate child scope variable changes to parent scope

问题描述

尽管在 ChildCtrl 中实例化了一个新"变量，我如何进行变量更改并轻松地将它们传播回 ParentCtrl?最小或没有 $on 和 $watch 的额外积分(使其更容易实现)

父控件

• ChildCtrl/ChildCtrl2/ChildCtrl3/ChildCtrl4

  • 查看

我的 ChildCtrl 的不同之处在于我无法轻松抽象出主布局和 ng-view，但它们都依赖于 ParentCtrl 中的相同功能.

$scope.searchTerms 在 ParentCtrl 中定义，但带有 ng-model='searchTerms' 的输入框在子控制器的视图中.当此 var 更改时，它不会反映在 ParentCtrl 中，仅反映在 ChildCtrls 中.

示例:http://jsfiddle.net/JHwxP/22/

HTML 部分

<div ng-controller="父级">parentX = {{x}} 
parentY = {{y}}
<div ng-controller="孩子">childX = {{x}}
childY = {{y}}
<a ng-click="modifyBothScopes()">modifyBothScopes</a><br><br>此处的更改需要出现在父级"中.<输入ng-model='y'>

控制器

function Parent($scope) {$scope.x= 5;$scope.y= 5;}函数子($scope){$scope.modifyBothScopes= function() {$scope.$parent.x++;};}

更新

我目前正在尝试一种共享服务方法:https://gist.github.com/exclsr/3595424

更新

尝试发射/广播系统

已解决问题:我将 $scope.searchTerms 存储在父级中，并在更改时在子级 $scope 中创建了一个空间.

解决办法:我应该在父级中执行 $scope.search.terms 并且在子级中更改时它会冒泡到父级.

示例:http://jsfiddle.net/JHwxP/23/

解决方案

这是原型继承的工作原理造成的.

当您在子控制器中请求 $scope.x 时，它会检查是否在其作用域中定义了 x，如果没有，则在父作用域中查找 x.

如果您分配给子作用域的 x 属性，它只会修改子作用域.

处理此问题并获得共享行为的一种简单方法是使用对象或数组.

function ParentCtrl($scope) {$scope.model = {x: 5, y: 5};}函数 ChildCtrl($scope) {$scope.update = 函数(x，y){$scope.model.x = x;$scope.model.y = y;};}

在这里，更改将在两个作用域中都可见，因为 $scope.model 将在父作用域和子作用域中引用同一个对象.

John Lindquist 有一个关于此的视频.

How can I take variable changes and easily propagate them back to the ParentCtrl despite a 'new' var being instantiated in the ChildCtrl? Extra points for minimal to no $on's and $watch's (makes it easier to implement)

ParentCtrl

• ChildCtrl / ChildCtrl2 / ChildCtrl3 / ChildCtrl4

  • View

My ChildCtrl's are just different enough where I can't easily abstract a master layout and a ng-view, but they all depend on the same functions in ParentCtrl.

$scope.searchTerms is defined in ParentCtrl but the input box with ng-model='searchTerms' is in the view of the child controllers. When this var changes it's not reflected in the ParentCtrl only the ChildCtrls.

Example: http://jsfiddle.net/JHwxP/22/

HTML Partial

<div ng-app>
    <div ng-controller="Parent">
        parentX = {{x}} <br/>
        parentY = {{y}}<br/>
        <div ng-controller="Child">
            childX = {{x}}<br/>
            childY = {{y}}<br/>
            <a ng-click="modifyBothScopes()">modifyBothScopes</a><br>
            <br>
            The changes here need to appear in 'Parent'. <input ng-model='y'>
        </div>
    </div>
</div>

Controllers

function Parent($scope) {
    $scope.x= 5;
    $scope.y= 5;
}

function Child($scope) {
    $scope.modifyBothScopes= function() {
       $scope.$parent.x++;
    };  
}

UPDATE

I'm currently attempting a shared service approach: https://gist.github.com/exclsr/3595424

UPDATE

Trying an emit/broadcast system

SOLVED Problem: I was storing $scope.searchTerms in the parent and when changed created a space in the child $scope.

Solution: I should have done $scope.search.terms in the parent and when changed in the child it would bubble up to the parent.

Example: http://jsfiddle.net/JHwxP/23/

解决方案

This is due to how prototypal inheritance works.

When you ask for $scope.x in the child controller, it checks to see if x is defined on its scope, and if not, looks for x in the parent scope.

If you assign to the child scope's x property, it only modifies the child scope.

An easy way to deal with this and get the sharing behavior is to use an object or an array.

function ParentCtrl($scope) {
  $scope.model = {x: 5, y: 5};
}

function ChildCtrl($scope) {
  $scope.update = function(x, y) {
    $scope.model.x = x;
    $scope.model.y = y;
  };
}

Here, the changes will be visible in both scopes, because $scope.model will refer to the same object in both parent and child scopes.

John Lindquist has a video on this.

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