角JS传播子作用域变量的变化父范围 [英] Angular JS propagate child scope variable changes to parent scope

问题描述

我怎么能变量的变化，轻松地传播他们回到ParentCtrl尽管新变种在ChildCtrl被实例化？对公司和$手表没有$加分最少的（更容易实现）

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

ParentCtrl

• ChildCtrl / ChildCtrl2 / ChildCtrl3 / ChildCtrl4

• ChildCtrl / ChildCtrl2 / ChildCtrl3 / ChildCtrl4

• 查看

我的ChildCtrl的只是不同的地方够我不能轻易抽象的总纲和NG-观点，但它们都依赖于ParentCtrl相同的功能。

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在ParentCtrl定义，但与NG-模式='searchTerms'输入框是子控制器的看法。当这种变化VAR它不会反映在ParentCtrl只有ChildCtrls。

$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.

例如：
http://jsfiddle.net/JHwxP/22/

HTML部分

<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>

控制器

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

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

更新

目前，我正在尝试共享服务的方法： https://gist.github.com/exclsr/3595424

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

更新

尝试一个EMIT /广播系统

Trying an emit/broadcast system

解决
问题：
我是在父存储$ scope.searchTerms和改变时创建在子$范围的空间。

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

解决方案：
我应该在父做了$ scope.search.terms而当孩子改变了它会冒泡到父。

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

例如： http://jsfiddle.net/JHwxP/23/

推荐答案

这是由于如何原型继承工作。

This is due to how prototypal inheritance works.

当您在子控制器要求 $ scope.x ，它检查是否x是它的范围界定，如果没有，则查找在x父范围。

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.

如果您分配给子范围的 X 属性，它只是改变了孩子的范围。

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

这是简单的方法来处理这​​个并获得分享行为是使用一个对象或数组。

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;
  };
}

在这里，变化将是在这两个范围可见，因为 $ scope.model 将指向同一个对象在两个父母和孩子的作用域。

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

约翰·林德奎斯特对这个一个视频。

John Lindquist has a video on this.

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