当递归地重复ng-repeat时，如何在ng-include中获取父元素

Question

I made a recursive ng-repeat element, and trying to manipulate things has turned into a nightmare, because I don't have reference to the parent I'm iterating over. 我做了一个递归的ng-repeat元素，并试图操纵事物变成了一场噩梦，因为我没有引用我正在迭代的父。

The ng-repeat looks like this: ng-repeat看起来像这样：

ng-repeat="(key, value) in value"

Remember It's recursive, so each value in value becomes the new value, so I can't just use the "in" value from ng-repeat. 记住它是递归的，因此值中的每个值都成为新值，因此我不能只使用ng-repeat中的“in”值。 I want to do such things as checking if the parent is an array, but $parent is some weird thing, not the parent element of the current iteration value. 我想做的事情是检查父是否是一个数组，但是$ parent是一些奇怪的东西，而不是当前迭代值的父元素。

Some examples of things I want to do is: 我想要做的一些事情的例子是：

ng-show="isArray(parent)"
ng-click="delete(parent, $index)"

(as an example of what I'm doing as a work around, I've had to add an ___ISARRAYELEMENT___ property to each of my array elements, just to know that it's in an array >.>;;) （作为我正在做的工作的一个例子，我必须为每个数组元素添加一个___ISARRAYELEMENT___属性，只是为了知道它在一个数组中>。> ;;）

EDIT: Basically I want to know if there is any convenient meta data in an ng-repeat context that I'm missing. 编辑：基本上我想知道在我重复的ng-repeat上下文中是否有任何方便的元数据。

EDIT: Ok here is the html in it's entirety: 编辑：好的，这里的html是完整的：

<html ng-app>
<head>
    <title>JSON CRUD</title>
    <link href="//netdna.bootstrapcdn.com/bootstrap/3.0.3/css/bootstrap.min.css" rel="stylesheet">
    <script src="//ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
    <script src="//netdna.bootstrapcdn.com/bootstrap/3.0.3/js/bootstrap.min.js"></script>
    <script src="//ajax.googleapis.com/ajax/libs/angularjs/1.2.6/angular.min.js"></script>
    <script src="angularjsoncrud.js"></script>
    <script type="text/ng-template" id="node.html">
        <button ng-click="minimized = !minimized" ng-show="!isLeaf(value)" ng-init="minimized=false" ng-class="{'glyphicon glyphicon-plus': minimized, 'glyphicon glyphicon-minus': !minimized}">-</button>
        <input ng-model="value.___KEY___" ng-if="!isArrayElement(value)" />
        <input ng-if="isLeaf(value)" ng-model="value.___VALUE___" />
        <ul ng-if="!isLeaf(value)" ng-show="!minimized">
            <li ng-repeat="(key,value) in value" ng-if="key != '___KEY___' && key != '___ISARRAY___'" ng-include="'node.html'"></li>
            <button type="button" ng-if="isArray(value)" ng-click="addToArray(value)">Add Element</button>
        </ul>
    </script>
</head>
<body ng-app="Application" ng-controller="jsoncrudctrl">
    <ul>
        <li ng-repeat="(key,value) in json" ng-include="'node.html'"></li>
    </ul>
    <pre>{{stringify(json)}}</pre>
</body>
</html>

One thing I would like to do is replace isArrayElement(value) with isArray(parent), because isArrayElement relies on meta data I added to the array, which I would prefer to not have to add. 我想做的一件事是用isArray（parent）替换isArrayElement（value），因为isArrayElement依赖于我添加到数组的元数据，我宁愿不必添加。

Answer 1

ng-repeat creates a new scope for each element. ng-repeat为每个元素创建一个新范围。
ng-include also creates a new scope. ng-include还会创建一个新范围。

When you use ng-include together with ng-repeat , there are 2 scopes created for each element: 将ng-include与ng-repeat一起使用时，为每个元素创建了两个范围：

Scope created by ng-repeat for current element. 由ng-repeat为当前元素创建的范围。 This scope holds the current element in the iteration. 此范围保存迭代中的当前元素。
Child scope created by ng-include which inherits from ng-repeat 's created scope. 由ng-include创建的子范围 ，它继承自ng-repeat的创建范围。

The $parent property of current scope allows you to access its parent scope. 当前作用域的$parent属性允许您访问其父作用域。

Essentially, scope created by ng-include is empty, when you access value and key in your node.html , it actually access the inherited values from parent scope created by ng-repeat . 从本质上讲， ng-include创建的范围是空的，当您在node.html访问value和key时，它实际上访问了ng-repeat创建的父范围中的继承值 。

In your node.html, accessing {{value}} is actually the same as {{$parent.value}} . 在您的node.html中，访问{{value}}实际上与{{$parent.value}} 。 Therefore if you need to access the parent of the current element, you have to do one step further by accessing {{$parent.$parent.value}} 因此，如果您需要访问当前元素的父元素，则必须通过访问{{$parent.$parent.value}}

This DEMO will clear things up: 这个DEMO将清理：

    <script type="text/ng-template" id="node.html">
        <div>
            Current: key = {{key}}, value = {{value}}
        </div>
        <div>
            Current (using $parent): key = {{$parent.key}}, value = {{$parent.value}}
        </div>
         <div>
             Parent: key = {{$parent.$parent.key}}, value = {{$parent.$parent.value}}, isArray: {{isArray($parent.$parent.value)}}
        </div>
        <ul ng-if="isObject(value)"> //only iterate over object to avoid problems when iterating a string
<li ng-repeat="(key,value) in value" ng-include="'node.html'"></li>            
        </ul>
    </script>

If you need to simplify the way to access the parent, you could try initializing the parent using onload of ng-include . 如果您需要简化访问父级的方式，可以尝试使用ng-include onload初始化父ng-include 。 Like this: 像这样：

In your top level, there is no ng-if => only 2 level deep 在您的顶级，没有ng-if =>只有2级深度

<ul>
    <li ng-repeat="(key,value) in json" 
     ng-include="'node.html'" onload="parent=$parent.$parent"></li>
</ul>

In your sub levels, there is ng-if => 3 levels deep: 在您的子级别中，有ng-if => 3级别：

    <ul ng-if="isObject(value)">
        <li ng-repeat="(key,value) in value" 
ng-include="'node.html'" onload="parent=$parent.$parent.$parent"></li>            
    </ul>

Inside the template, you could access the parent using parent , grandparent using parent.parent and so on. 在模板内部，您可以使用parent ，祖父母使用parent.parent访问parent ，依此类推。

DEMO DEMO

Answer 2

I would stay away from Angular's $parent and all the $scope creation and inheritance madness. 我会远离Angular的$parent和所有$scope创建和继承疯狂。 What you need is to keep a reference to the parent object, not finding how many scopes are in-between ng-include 's and ng-repeat 's and juggling with $parent.$parent . 你需要的是保持对父对象的引用，而不是在ng-include和ng-repeat之间找到多少范围，并且用$parent.$parent 。 My suggestion is to explicitly save references to the values you are interested in, just implement it yourself with custom logic. 我的建议是明确保存对您感兴趣的值的引用，只需使用自定义逻辑自行实现。 For example, if you want to expose a value from the parent ng-repeat to the child ng-repeat 例如，如果要将父ng-repeat中的值公开给子ng-repeat

<!-- Explictly save the value into the parent var -->
<div ng-init="parent = value">
  <!-- Save parent reference and
       update the parent var to point to the new value -->
  <div ng-repeat="(k,value) in value"
       ng-init="value._parent = parent; parent = value;"> 
    <div ng-repeat="(k,value) in value"
         ng-init="value._parent = parent">
      <button ng-click="doSomething(value)"></button>
    </div>
  </div>
</div>

Then in your javascript code you can access all parents recursively 然后在您的JavaScript代码中，您可以递归访问所有父项

function doSomething(value){
  parent1 = value._parent;
  parent2 = parent1._parent;
}

Same code with ng-include 与ng-include相同的代码

<div ng-init="parent = value">
  <div ng-repeat="(key,value) in value"
       ng-init="value._parent = parent; parent = value;"
       ng-include="'node.html'">
  </div>
</div>

<script type="text/ng-template" id="node.html">
  <div ng-if="!isLeaf(value)"
       ng-repeat="(key,value) in value"
       ng-init="value._parent = parent; parent = value;"
       ng-include="'node.html'"> 

  <button ng-if="isLeaf(value)" ng-click="doSomething(value)"></button>
</script>

当递归地重复ng-repeat时，如何在ng-include中获取父元素

问题描述

2 个解决方案

解决方案1
29 已采纳 2014-01-05 03:00:52

解决方案2
3 2014-01-11 13:30:03

当递归地重复ng-repeat时，如何在ng-include中获取父元素

问题描述

2 个解决方案

解决方案1 29 已采纳 2014-01-05 03:00:52

解决方案2 3 2014-01-11 13:30:03

解决方案1
29 已采纳 2014-01-05 03:00:52

解决方案2
3 2014-01-11 13:30:03