dart - Dart 聚合物，访问自定义属性在脚本中返回 null

Question

我将客户端作为参数发送到自定义客户端跟踪详细信息（在 home.html 中）并在“client_followup_detail.html”中显示它们的信息，但是当我尝试从“client_followup_detail.dart”访问客户端属性时发生异常。

主页.html

<template repeat="{{index in extraTabsIndex}}">
  <template if="{{activeTab == index}}">
    <div class="tab-pane fade in active">
      <p>
         <client-followup-detail client="{{clientSelect}}"></client-followup-detail>
      </p>
    </div>
 </template>

client_followup_detail.html

<td>{{client.state}}</td>
<td>{{client.cellphone}}</td>
<td>{{client.lastContactDate}}</td>

client_followup_detail.dart

  @published Client client;  
  ClientFollowupDetail.created() : super.created() {
    eventBus = getInstanceEventBus();
    print(client.names);    //  client null
  }

错误：

Exception: The null object does not have a getter 'names'.
NoSuchMethodError : method not found: 'names'
Receiver: null
Arguments: []

Answer 1

ClientFollowupDetail 实例可能没有被聚合物完全初始化。

将您的create代码移动到以下内容的覆盖中可能会有所帮助ready：

ready() {
  super.ready();
  eventBus = getInstanceEventBus();
  print(client.names);
}