AngularJS:嵌套指令中的对象未定义? [英] AngularJS: Objects inside nested directives getting undefined?

问题描述

所以，我有两个指令，一个包含一个模板文件，其中包含另一个相同类型的指令.

第一个指令看起来像:

.directive('billInfo', function () {返回 {//范围:真，范围: {对象:'='},限制:'E'，templateUrl: 'views/templates/bill-info.html',链接:函数(范围、元素、属性){scope.status = scope.obj.getStatus();scope.bill = scope.obj;}}})

模板非常简单，比如;

<span class="glyphicon glyphicon-cutlery">{{bill.getTable()}}</span><small><span class="time"></span></small><div class="btn-group bill-btn"><bill-btns billobj="bill"></bill-btns>

billBtns 的指令如下所示:

.directive('billBtns', function () {返回 {范围: {账单对象:'='},限制:'E'，模板:'<div><div>koko{{status}}</div></div>',链接:函数(范围、元素、属性){控制台日志(范围，范围.billobj)；scope.status = scope.billobj.getStatus();}}})

问题出乎意料:scope.billobj 结果是未定义的.当我从 billBtns 指令的链接函数中控制台日志 scope 时，一切似乎都没有问题:我可以在范围内看到 billobj.

这里发生了什么?我在这里做错了什么吗?

billInfo 模板

 <div draggable ng-repeat="(index, bill) in getEnq()" bill="bill" id="bill-{{bill.orderCode}}" class="container panel panel-默认帐单浮动-{{index%2}}" style="width:300px;"data-created="{{bill.getCreatedOn()}}"><bill-info obj="bill"></bill-info>

解决方案

我相信我已经找到了解决方案，但我不确定这是否是正确的做法.新的 billBtns 指令如下所示:

.directive('billBtns', function () {返回 {限制:'E'，模板:'<div><div>koko{{status}}</div></div>',链接:函数(范围、元素、属性){控制台日志(范围，范围.$parent.obj)；scope.status = scope.$parent.bill.getStatus();}}})

这就解决了问题.我的怀疑是这样的，如果我们再次查看 billInfo 指令，我会执行以下操作:

 scope.bill = scope.obj;//哇?

我想更多地了解为什么会发生这种情况，以及为什么我可以从嵌套指令访问 scope.$parent.bill 而不是 scope.$parent.obj 而不会出现类型错误.或者这只是级联作用域的方式.

So, I have two directives, one that has a template file, which contains another directive of the same type.

The first directive looks like:

.directive('billInfo', function () {
    return {
        // scope: true,
        scope: {
            obj: '='
        },
        restrict: 'E',
        templateUrl: 'views/templates/bill-info.html',
        link: function (scope, element, attrs) {
            scope.status = scope.obj.getStatus();
            scope.bill = scope.obj;
        }
    }
})

And the template is pretty simple, something like;

<h4>
  <span class="glyphicon glyphicon-cutlery">
    {{bill.getTable()}}
  </span>
  <small><span class="time"></span></small>
  <div class="btn-group bill-btn">
      <bill-btns billobj="bill"></bill-btns>
  </div>
</h4>

The directive for billBtns looks like:

.directive('billBtns', function () {
    return {
        scope: {
            billobj: '='
        },
        restrict: 'E',
        template: '<div><div>koko{{status}}</div></div>',
        link: function (scope, element, attrs) {
            console.log(scope, scope.billobj);
            scope.status = scope.billobj.getStatus();
        }
    }
})

The problem is unexpected: scope.billobj turns out to be undefined. When I console log scope from within the link function of the billBtns directive, all seems ok: I can see billobj inside scope.

What is going on here? Am I doing something fundamentally wrong here?

EDIT: Template for billInfo

  <div draggable ng-repeat="(index, bill) in getEnq()" bill="bill" id="bill-{{bill.orderCode}}" class="container panel panel-default bill float-{{index%2}}" style="width:300px;" data-created="{{bill.getCreatedOn()}}">
    <bill-info obj="bill"></bill-info>
  </div>

解决方案

I believe I've come to a solution, but I'm uncertain as to if this is the right practice. Here's what the new billBtns directive looks like:

.directive('billBtns', function () {
    return {
        restrict: 'E',
        template: '<div><div>koko{{status}}</div></div>',
        link: function (scope, element, attrs) {
            console.log(scope, scope.$parent.obj);
            scope.status = scope.$parent.bill.getStatus();
        }
    }
})

And that solves the problem. My suspicion is this, if we look at the billInfo directive again, I do something like:

    scope.bill = scope.obj; // woah?

I'd like to understand more about why this happens and why I can access scope.$parent.bill from a nested directive but not scope.$parent.obj without getting typeerrors. Or maybe thats just the way to cascade scopes.

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