Angularjs 从父窗体设置子窗体的监视程序

这是我对父窗体的代码

表达式生成器
为所选频道配置属性。

表达式查看器
为配置的属性生成表达式。

这是我的孩子表单的代码

{{$root.loadMoreText}

我想在子窗体上为子窗体中的所有更改设置一个监视程序，并在父窗体上检测相同的更改。我正在尝试从父窗体将监视程序设置为子窗体

请帮忙

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Nikhil

你看过$broacast、$on和emit吗

对你来说，这可能是一个更好的解决方案

$rootScope.Scope

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另一种解决方案是将作用域值从父级映射到子级，或者从子级重用父级作用域中的setter

请给出一个小代码片段好吗？刚开始使用此功能的用户为此尝试了$emit。获取$scope.on不是有效的函数。人们在谷歌上搜索它，说这是因为emit在指令初始化之前就被触发了。但是这个发射作为观察者的一部分被解雇了。我该怎么解决呢？如果你看一下文档，它是“$on”而不是“on”

  <div ng-include="'app/modules/common/layout/create-rule-header-actions.tpl.html'"></div>
  <div style="clear: both"></div>
  <!-- Header Attributes Template-->
  <div ng-include="'app/modules/common/layout/create-rule-header.tpl.html'"></div>
  <div style="clear: both"></div>

  <!-- First row start -->
  <div class="row">
     <!-- Left Side Block:  Expression Builder for Primary attributes -->
     <span class="col-sm-9 nopadding expression-block" ng-if="createCtrl.rfc.showTree && createCtrl.rfc.attributes.length > 0" ng-class="createCtrl.rfc.fullscreen?'fullscreen':''">
        <div class="row rf-tree-box marginLeftRight10" ng-controller="PrimaryMappingController as mappingCtrl">
           <div class="col-lg-12 rf-nodes-content"  griffin-mapping-component-reorder mcr-toggle="mappingCtrl.rfc.showReorder">
              <label class="width99">Expression Builder
                 <div class="sub-label ng-binding">Configure attributes for selected channel(s).</div>

              </label>
              <div ui-tree="mappingCtrl.rfc.treeOptions" id="tree2-root" data-max-depth="5" data-drag-delay="100" >
                 <ol ui-tree-nodes ng-model="createCtrl.currentRule.criteria" ng-init="mappingCtrl.currentAttributes(this)">
                    <li ng-repeat="node in createCtrl.currentRule.criteria track by node.id" ui-tree-node ng-include="'app/modules/common/layout/mapping/primary-node-tmpl.html'"></li>
                 </ol>
              </div>

              <label style="margin-top:80px;">Expression Viewer
                 <div class="sub-label ng-binding">Generated expression for configured attributes.</div></label>
              <div  ng-if="createCtrl.rfc.showTree " ng-controller="PrimaryMappingController as mappingCtrl">
                 <div class="rf-nodes-content">
                    <textarea id="expressionText" class="expressionText" placeholder="Dynamic expression" cols="30" rows="5" readonly ng-model="createCtrl.rfc.expression"></textarea>
                 </div>
              </div>
           </div>
        </div>
     </span>

     <span ng-if="(node.type == 'L')" ng-include=" 'app/modules/common/widgets/mapping-tree/mapping-logical-node.html'"></span>
     <span ng-if="(node.type == 'X')" ng-include="'app/modules/common/widgets/mapping-tree/mapping-expression-node.html'"></span>
  </div>