为什么使用自定义元素时会出现内部Dartium异常？ [英] Why do I get an Internal Dartium Exception when using custom elements?

问题描述

我在控制台中看到此错误：

I am seeing this error in my console:

Exception: InvalidStateError: Internal Dartium Exception
  PolymerDeclaration.registerType (package:polymer/src/declaration.dart:241:22)
  PolymerDeclaration.register (package:polymer/src/declaration.dart:175:17)
  PolymerDeclaration._register (package:polymer/src/declaration.dart:114:13)
  PolymerDeclaration.registerWhenReady (package:polymer/src/declaration.dart:109:14)
  _notifyType (package:polymer/src/declaration.dart:514:49)
  Polymer.register (package:polymer/src/instance.dart:64:16)
  _loadLibrary (package:polymer/src/loader.dart:177:25)

我有这样的代码：

@CustomTag('person-tag')
class PersonTag extends PolymerElement {

我的HTML是这样的：

And my HTML is like this:

<polymer-element name="person-tag" extends="li">

为什么我得到 Internal Dartium Exception registerType

推荐答案

extends =li，但Dart代码仅扩展 PolymerElement 。

You are seeing this error because your HTML says extends="li" but the Dart code only extends PolymerElement.

如果你在 polymer-element 中使用 extends 属性，那么你的Dart类也必须扩展

If you use an extends attribute in your polymer-element, then your Dart class must also extend the same kind of element.

要解决问题中的问题，请更改Dart类：

To fix the problem in the question, change the Dart class:

@CustomTag('person-tag')
class PersonTag extends LIElement with Polymer, Observable {

现在 PersonTag 真的扩展< li> 。

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