保持未捕获(承诺):错误:模板解析错误:“组件"不是已知元素: [英] Keep getting Uncaught (in promise): Error: Template parse errors: 'component' is not a known element:

问题描述

这是一些代码片段.

组件:

import { Component } from '@angular/core';@成分({选择器:'app-generalstatistics'，templateUrl: './generalstatistics.component.html',styleUrls: ['./generalstatistics.component.css']})导出类一般统计{公共数据:数组<对象>；构造函数(){}}

app.module.ts:

import { Generalstatistics } from './views/generalstatistics/generalstatistics.component';声明: [....一般统计],

在 DashboardModule/DashboardComponent.html 中实现:

<div class="chart-wrapper mt-3 mx-3" style="height:70px;"><app-generalstatistics></app-generalstatistics>

错误:

core.js:4002 错误错误:未捕获(承诺):错误:模板解析错误:'app-generalstatistics' 不是已知元素:1. 如果'app-generalstatistics' 是一个Angular 组件，那么验证它是否是这个模块的一部分.2. 如果 'app-generalstatistics' 是一个 Web 组件，则将 'CUSTOM_ELEMENTS_SCHEMA' 添加到此组件的@NgModule.schemas"以抑制此消息.("

<div class="chart-wrapper mt-3 mx-3" style="height:70px;">[错误 ->]

"): ng:///DashboardModule/DashboardComponent.html

我到底做错了什么?

感谢您的帮助.

解决方案

我假设您应该将 app-generalstatistics 组件添加到 declarations: [] 的 code>DashboardModule 以及(实际上就是你使用它的地方)

Afaik NgModule 是模板的编译上下文.所以我们必须在每个使用它的模块中声明一个组件.

为什么?在我的想法中:否则编译可能需要一段时间，因为在这种情况下，Angular 将不得不搜索组件定义，而这可能存在于任何依赖项中，包括 3rd 方.

Here are some code fragments.

Component:

import { Component } from '@angular/core';

@Component({
 selector: 'app-generalstatistics',
 templateUrl: './generalstatistics.component.html',
 styleUrls: ['./generalstatistics.component.css']
})
export class Generalstatistics  {
 public data: Array<Object>;
 constructor() { }
}

app.module.ts:

import { Generalstatistics } from './views/generalstatistics/generalstatistics.component';

   declarations: [
   ....
   Generalstatistics
],

Implementation in DashboardModule/DashboardComponent.html:

<div class="chart-wrapper mt-3 mx-3" style="height:70px;">
      <app-generalstatistics></app-generalstatistics>
    </div>

Error:

core.js:4002 ERROR Error: Uncaught (in promise): Error: Template parse errors:
'app-generalstatistics' is not a known element:
1. If 'app-generalstatistics' is an Angular component, then verify that it is part of this module.
2. If 'app-generalstatistics' is a Web Component then add 'CUSTOM_ELEMENTS_SCHEMA' to the 
'@NgModule.schemas' of this component to suppress this message. ("
    </div>
    <div class="chart-wrapper mt-3 mx-3" style="height:70px;">
      [ERROR ->]<app-generalstatistics></app-generalstatistics>
    </div>
  </div>
 "): ng:///DashboardModule/DashboardComponent.html

What exactly am I doing wrong?

Thanks for help.

解决方案

I assume you should add the app-generalstatistics component to the declarations: [] of your DashboardModule as well (Actually just where you use it)

Afaik the NgModule is the compilation context for the templates. So we have to declare a component in every module in which it is used.

Why? In my thinking: Otherwise the compilation would probably take a while because in that case Angular would have to go searching for the components definition and that could possibly be in any dependency including 3rd parties.

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