angularjs - 在 angularjs 指令范围内公开对象，无法访问属性

Question

所以，我有以下相对简单的 Angularjs 指令

app.directive('myDirective', function () {
      return {
          restrict: 'E',
          scope: {
              site: '@',
              index: '@'
          },
          template: '<div>{{site}}</div>',
          replace: true,

      }
  });

这是我在 HTML 中调用指令的地方

<div id="eventGraphic" class="span12">
    <my-directive ng-repeat="site in IEvent.sites" site="{{site}}" index="{{$index}}"></my-directive>
</div>

其中，鉴于每个 site是一个对象，产生这个输出(从浏览器复制)

{"name":"Hurlburt","_id":"5148bb6b79353be406000005","enclaves":[]}
{"name":"Walker Center","_id":"5148cca5436905781a000005","enclaves":[]}
{"name":"test1","_id":"5148ce94436905781a000006","enclaves":[]}
{"name":"JDIF","_id":"5148cf37436905781a000007","enclaves":[]} 

但是，如果我将指令中的模板更改为

 template: '<div>{{site.name}}</div>',

它不会产生任何输出。这似乎是一个相当简单的用例，有什么想法我可能做错了吗？所需的输出将只是 name每个对象中的字段。

Answer 1

您需要使用 '='映射对象。 '@'意味着您只是将字符串值传递给新范围。

app.directive('myDirective', function () {
      return {
          restrict: 'E',
          scope: {
              site: '=', //two-way binding
              index: '@' //just passing an attribute as a string.
          },
          template: '<div>{{site}}</div>',
          replace: true,

      }
  });

然后在您的标记中，不要在属性中使用绑定(bind)，只需传递表达式:

<div id="eventGraphic" class="span12">
    <!-- below, site="site" is passing the expression (site) to
         the two way binding for your directive's scope,
         whereas index="{{$index}}" is actually evaluating the expression
         ($index) and passing it as a string to the index attribute,
         which is being put directly into the directive's scope as a string -->
    <my-directive ng-repeat="site in IEvent.sites" 
            site="site" 
            index="{{$index}}"></my-directive>
</div>