angular - ionic 幻灯片问题错误错误 : Uncaught (in promise): Error: Template parse errors:

Question

我昨天刚开始学习ionic5，就是引用这个网站

https://www.9lessons.info/2019/08/ionic-5-angular-8-welcome-page.html

创建应用幻灯片时发生错误

捕获的错误来自开发者工具浏览器的控制台选项卡

ERROR Error: Uncaught (in promise): Error: Template parse errors:
Can't bind to 'options' since it isn't a known property of 'ion-slides'.
1. If 'ion-slides' is an Angular component and it has 'options' input, then verify that it is part of this module.
2. If 'ion-slides' is a Web Component then add 'CUSTOM_ELEMENTS_SCHEMA' to the '@NgModule.schemas' of this component to suppress this message.
3. To allow any property add 'NO_ERRORS_SCHEMA' to the '@NgModule.schemas' of this component. ("<ion-slides pager="true" [ERROR ->][options]="slideOpts">
  <ion-slide>
    <h1>Slide 1</h1>
"): ng:///ComponentsModule/SlidesComponent.html@0:25
'ion-slide' is not a known element:
1. If 'ion-slide' is an Angular component, then verify that it is part of this module.
2. If 'ion-slide' is a Web Component then add 'CUSTOM_ELEMENTS_SCHEMA' to the '@NgModule.schemas' of this component to suppress this message. ("<ion-slides pager="true" [options]="slideOpts">
  [ERROR ->]<ion-slide>
    <h1>Slide 1</h1>
  </ion-slide>
"): ng:///ComponentsModule/SlidesComponent.html@1:2
'ion-slide' is not a known element:
1. If 'ion-slide' is an Angular component, then verify that it is part of this module.
2. If 'ion-slide' is a Web Component then add 'CUSTOM_ELEMENTS_SCHEMA' to the '@NgModule.schemas' of this component to suppress this message. ("
    <h1>Slide 1</h1>
  </ion-slide>
  [ERROR ->]<ion-slide>
    <h1>Slide 2</h1>
  </ion-slide>
"): ng:///ComponentsModule/SlidesComponent.html@4:2
'ion-slide' is not a known element:
1. If 'ion-slide' is an Angular component, then verify that it is part of this module.
2. If 'ion-slide' is a Web Component then add 'CUSTOM_ELEMENTS_SCHEMA' to the '@NgModule.schemas' of this component to suppress this message. ("
    <h1>Slide 2</h1>
  </ion-slide>
  [ERROR ->]<ion-slide>
    <h1>Slide 3</h1>
  </ion-slide>
"): ng:///ComponentsModule/SlidesComponent.html@7:2
'ion-slides' is not a known element:
1. If 'ion-slides' is an Angular component, then verify that it is part of this module.
2. If 'ion-slides' is a Web Component then add 'CUSTOM_ELEMENTS_SCHEMA' to the '@NgModule.schemas' of this component to suppress this message. ("[ERROR ->]<ion-slides pager="true" [options]="slideOpts">
  <ion-slide>
    <h1>Slide 1</h1>
"): ng:///ComponentsModule/SlidesComponent.html@0:0
Error: Template parse errors:
Can't bind to 'options' since it isn't a known property of 'ion-slides'.
1. If 'ion-slides' is an Angular component and it has 'options' input, then verify that it is part of this module.
2. If 'ion-slides' is a Web Component then add 'CUSTOM_ELEMENTS_SCHEMA' to the '@NgModule.schemas' of this component to suppress this message.
3. To allow any property add 'NO_ERRORS_SCHEMA' to the '@NgModule.schemas' of this component. ("<ion-slides pager="true" [ERROR ->][options]="slideOpts">
  <ion-slide>
    <h1>Slide 1</h1>
"): ng:///ComponentsModule/SlidesComponent.html@0:25
'ion-slide' is not a known element:
1. If 'ion-slide' is an Angular component, then verify that it is part of this module.
2. If 'ion-slide' is a Web Component then add 'CUSTOM_ELEMENTS_SCHEMA' to the '@NgModule.schemas' of this component to suppress this message. ("<ion-slides pager="true" [options]="slideOpts">
  [ERROR ->]<ion-slide>
    <h1>Slide 1</h1>
  </ion-slide>
"): ng:///ComponentsModule/SlidesComponent.html@1:2
'ion-slide' is not a known element:
1. If 'ion-slide' is an Angular component, then verify that it is part of this module.
2. If 'ion-slide' is a Web Component then add 'CUSTOM_ELEMENTS_SCHEMA' to the '@NgModule.schemas' of this component to suppress this message. ("
    <h1>Slide 1</h1>
  </ion-slide>
  [ERROR ->]<ion-slide>
    <h1>Slide 2</h1>
  </ion-slide>
"): ng:///ComponentsModule/SlidesComponent.html@4:2
'ion-slide' is not a known element:
1. If 'ion-slide' is an Angular component, then verify that it is part of this module.
2. If 'ion-slide' is a Web Component then add 'CUSTOM_ELEMENTS_SCHEMA' to the '@NgModule.schemas' of this component to suppress this message. ("
    <h1>Slide 2</h1>
  </ion-slide>
  [ERROR ->]<ion-slide>
    <h1>Slide 3</h1>
  </ion-slide>
"): ng:///ComponentsModule/SlidesComponent.html@7:2
'ion-slides' is not a known element:
1. If 'ion-slides' is an Angular component, then verify that it is part of this module.
2. If 'ion-slides' is a Web Component then add 'CUSTOM_ELEMENTS_SCHEMA' to the '@NgModule.schemas' of this component to suppress this message. ("[ERROR ->]<ion-slides pager="true" [options]="slideOpts">
  <ion-slide>
    <h1>Slide 1</h1>
"): ng:///ComponentsModule/SlidesComponent.html@0:0
    at syntaxError (compiler.js:2175)
    at TemplateParser.parse (compiler.js:11188)
    at JitCompiler._parseTemplate (compiler.js:25721)
    at JitCompiler._compileTemplate (compiler.js:25709)
    at compiler.js:25653
    at Set.forEach (<anonymous>)
    at JitCompiler._compileComponents (compiler.js:25653)
    at compiler.js:25566
    at Object.then (compiler.js:2166)
    at JitCompiler._compileModuleAndComponents (compiler.js:25565)
    at resolvePromise (zone-evergreen.js:797)
    at resolvePromise (zone-evergreen.js:754)
    at zone-evergreen.js:858
    at ZoneDelegate.invokeTask (zone-evergreen.js:391)
    at Object.onInvokeTask (core.js:34182)
    at ZoneDelegate.invokeTask (zone-evergreen.js:390)
    at Zone.runTask (zone-evergreen.js:168)
    at drainMicroTaskQueue (zone-evergreen.js:559)

我尝试过的解决方案包括

• 重启 ionic 服务

• 重启 Laragon IDE

我是 Web 开发人员，正在转向移动开发，并使用 Laragon 作为 Web IDE，因此 Laragon 已经包含在 npm 中，我继续使用 Laragon IDE 开发移动应用程序

示例代码如下，大部分代码引用自上面定义的教程网站

在 welcome.page.html 上

<ion-content>
  <app-slides></app-slides>

</ion-content>

在 slides.components.ts 上

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

@Component({
  selector: 'app-slides',
  templateUrl: './slides.component.html',
  styleUrls: ['./slides.component.scss'],
})
export class SlidesComponent implements OnInit {

  slideOpts = {
    initialSlide: 1,
    speed: 400
  };

  constructor() { }

  ngOnInit() {}

}

在 components.module.ts 上

import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';
import { SlidesComponent } from './slides/slides.component';
import { StartComponent } from './start/start.component';
import { LogoComponent } from './logo/logo.component';



@NgModule({
  declarations: [SlidesComponent, StartComponent, LogoComponent],
  exports: [SlidesComponent, StartComponent, LogoComponent],
  imports: [
    CommonModule
  ]
})
export class ComponentsModule { }

在 slides.component.html 上

<ion-slides pager="true" [options]="slideOpts">
  <ion-slide>
    <h1>Slide 1</h1>
  </ion-slide>
  <ion-slide>
    <h1>Slide 2</h1>
  </ion-slide>
  <ion-slide>
    <h1>Slide 3</h1>
  </ion-slide>
</ion-slides>

应该出来的结果是带有滑动功能的页面，但结果不是它，结果只出现白色空白页面，因此我检查元素并发现显示的错误

Answer 1

您的 ComponentsModule 中缺少 IonicModule。

错误说明了一切。如果您不导入您使用其组件的模块，angular 会给您该错误。

只需在 components.module.ts 中执行以下操作

import { IonicModule } from '@ionic/angular';

...

@NgModule({
  declarations: [SlidesComponent, StartComponent, LogoComponent],
  exports: [SlidesComponent, StartComponent, LogoComponent],
  imports: [
    CommonModule,
    IonicModule // <- do not forget to add this import
  ]
})
export class ComponentsModule { }