javascript - AngularJS:指令的模板未正确渲染

Question

我为下拉替换编写的指令中有一个非常奇怪的行为。使用的模型可以使用子节点无限嵌套。该指令的包含方式如下(HAML 代码):

.control-group
  -# use the angular directive "dropdown-tree" that can handle unlimited nested models!
  .controls{ "dropdown-tree" => "", "ng-model" => "categories_as_tree", "current-value" => "currentCategory", "dropdown-placeholder" => "choose category", "ng-disabled" => "!categories || categories.length==0", "on-change"=>"fetchProducts(category)" }

%h4 Products
.control-group
  .controls{ "dropdown-tree" => "", "ng-model" => "products_as_tree", "current-value" => "currentProduct", "dropdown-placeholder" => "choose product", "ng-disabled" => "!products || products.length==0" }

正如我到目前为止所遇到的，该模型的行为绝对正确!在调试 View 中或通过 console.log 或 $log 等方式，但指令的渲染会变得困惑，显示项目翻倍甚至成倍增加，具体取决于您切换下拉列表的次数。

CoffeeScript 如下所示，代码很简单:

# use array -> being resistend against uglifiers mangle
mymodule.directive 'dropdownTree', [ ->
  return {
    templateUrl: '/angular/templates/dropdown_tree'
    ,
    #require: 'ngModel', # don't need that so far, we keep things simple!
    scope: {
      ngModel: '=',
      dropdownPlaceholder: '@',
      currentValue: '=',
      ngDisabled: '=',
      onChange: '&'
    },
    link: (scope, element, attr, ngModelCtrl) ->

      # fake the ng-change
      scope.$watch('currentValue', ->
        scope.onChange()
      , true)

      scope.selectValue = (value) ->
        scope.currentValue = value

  }
]

指令的 View 模板代码由 Rails Controller 传递 它是用 HAML 编写的，看起来像这样。如果子节点存在，它使用无限嵌套:

.btn-group{ :name => "FIXME", "ng-required" => "true" }
  %a.btn.btn-default.dropdown-toggle{ "data-toggle" => "dropdown", href: "#", "ng-disabled"=>"ngDisabled" }
    {{currentValue.name || dropdownPlaceholder }}
    %span.caret
  %ul.dropdown-menu{ "ng-show" => "!ngDisabled" }
    %div{ "ng-repeat" => "model in ngModel", "ng-include" => "'node.html'" }

%script{ :type => "text/ng-template", :id => "node.html" }
  %li{ "ng-click" => "selectValue(model)" }
    %a
      {{model.name}}
  %ul{ "ng-repeat" => "model in model.children", :style => "margin-left: 10px;" }
    %div{ "ng-include" => "'node.html'" }

我对此没有任何问题，只是第二个下拉列表没有正确更新其 View ，而模型却如此。我想知道您是否可以提供帮助或查看一些不合法的内容。

亲切的问候， 亚历克斯

Answer 1

如果您在彼此之间嵌套了 ng-repeats，那么它呈现奇怪的原因可能是您对彼此之间的重复使用相同的名称。如果您这样做，您实际上会在 DOM 树中向下移动时覆盖该引用。