Question

我正在Ionic中创建一个页面，并且还为页脚创建了一个单独的组件，并且在页面中使用了页脚选择器，但这显示了错误。

这是我的组件> foot-card> foot-card.ts

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

@Component({
  selector: 'foot-card',
  templateUrl: 'foot-card.html'
})
export class FootCardComponent {

  text: string;

  constructor() {
    console.log('Hello FootCardComponent Component');
    this.text = 'Hello World';
  }

}

这是我的components.module.ts：

import { NgModule } from '@angular/core';
import { FootCardComponent } from './foot-card/foot-card';
import { IonicModule } from 'ionic-angular';

@NgModule({
    declarations: [FootCardComponent],
    imports: [IonicModule],
    exports: [FootCardComponent]
})

export class ComponentsModule {}

这是我的app.module.ts：

import { BrowserModule } from '@angular/platform-browser';
import { ErrorHandler, NgModule } from '@angular/core';
import { IonicApp, IonicErrorHandler, IonicModule } from 'ionic-angular';

import { MyApp } from './app.component';
import { HomePage } from '../pages/home/home';
import { ListPage } from '../pages/list/list';
import { LoginpagePage } from '../pages/loginpage/loginpage';
import { FrontPage } from './../pages/front/front';
import { FooterPage } from './../pages/footer/footer';

import { StatusBar } from '@ionic-native/status-bar';
import { SplashScreen } from '@ionic-native/splash-screen';

import { HttpClientModule } from '@angular/common/http';
import { RestapiProvider } from '../providers/restapi/restapi';
import { FootCardComponent } from '../components/foot-card/foot-card';
import { ComponentsModule } from '../components/components.module'


@NgModule({
  declarations: [
    MyApp,
    HomePage,
    ListPage,
    LoginpagePage,
    FrontPage,
    FooterPage,
    FootCardComponent
  ],
  imports: [
    BrowserModule,
    HttpClientModule,
    ComponentsModule,
    IonicModule.forRoot(MyApp)
  ],
  bootstrap: [IonicApp],
  entryComponents: [
    MyApp,
    HomePage,
    ListPage,
    LoginpagePage,
    FrontPage,
    FooterPage,
  ],
  providers: [
    StatusBar,
    SplashScreen,
    {provide: ErrorHandler, useClass: IonicErrorHandler},
    RestapiProvider
  ]
})
export class AppModule {}

这是我在首页中使用的选择器：（front.html）

<foot-card></foot-card>

但是显示错误。我是离子新手。非常感谢您的帮助。

错误：

类型FootCardComponent是2个模块的声明的一部分：ComponentsModule和AppModule！请考虑将FootCardComponent移至导入了ComponentsModule和AppModule的更高模块。您还可以创建一个新的NgModule，该NgModule导出并包含FootCardComponent，然后在ComponentsModule和AppModule中导入该NgModule。

Answer 1

从声明中剪切FootCardComponent并将其添加到Entry Components。让我知道这对您是否有用。

Answer 2

仅在app.module.js中：从声明中删除FootCardComponent并将其添加到Entry Components。这解决了我的问题。

请参见Ionic 4 custom components

Answer 3

请按照步骤

从 FootCardComponent 文件的声明部分中删除app.module.ts。

在 ComponentsModule 文件的导入部分中添加app.module.ts。

import { BrowserModule } from '@angular/platform-browser';
import { ErrorHandler, NgModule } from '@angular/core';
import { IonicApp, IonicErrorHandler, IonicModule } from 'ionic-angular';
import { MyApp } from './app.component';
import { HomePage } from '../pages/home/home';
import { ListPage } from '../pages/list/list';
import { LoginpagePage } from '../pages/loginpage/loginpage';
import { FrontPage } from './../pages/front/front';
import { FooterPage } from './../pages/footer/footer';
import { StatusBar } from '@ionic-native/status-bar';
import { SplashScreen } from '@ionic-native/splash-screen';
import { HttpClientModule } from '@angular/common/http';
import { RestapiProvider } from '../providers/restapi/restapi';
import { FootCardComponent } from '../components/foot-card/foot-card';
import { ComponentsModule } from '../components/components.module'


@NgModule({
  declarations: [
    MyApp,
    HomePage,
    ListPage,
    LoginpagePage,
    FrontPage,
    FooterPage,
    FootCardComponent **-------> *Remove this line***
  ],
  imports: [
    BrowserModule,
    HttpClientModule,
    ComponentsModule, ---------> *Add ComponentsModule in import section*
    IonicModule.forRoot(MyApp)
  ],
  bootstrap: [IonicApp],
  entryComponents: [
    MyApp,
    HomePage,
    ListPage,
    LoginpagePage,
    FrontPage,
    FooterPage,
  ],
  providers: [
    StatusBar,
    SplashScreen,
    {provide: ErrorHandler, useClass: IonicErrorHandler},
    RestapiProvider
  ]
})
export class AppModule {}

让我知道你的结果

我的页脚选择器在Ionic中不起作用

3 个答案:

请按照步骤