在 Angular2 中的两个组件之间传递数据会产生绑定错误

Passing Data Between Two Components In Angular2 Produces Binding Error

我一直在寻找 SO 来解决我的问题,我知道它被问了很多次,但它对我的问题没有用。

我有两个组件:

整个问题是尝试使用 @Inputs().

将数据从全布局组件传递到部门组件

下面我将先向您展示我的文件夹结构,然后是我的代码。

结构

Department Folder Structure

Layout-Folder Structure

departments.component.ts

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

@Component({
  selector: 'app-departments',
  templateUrl: './departments.component.html',
  inputs: ['valueToPass']
})
export class DepartmentsComponent implements OnInit {
  @Input() valueToPass;
  public _departments;
  constructor () { }
  ngOnInit() {
    console.log(this.valueToPass.nam);
  }
}

departments.module.ts

// import{...}...
// assume necessary imports above

@NgModule({
  imports: [
    DepartmentsRoutingModule,
    CommonModule,
    MaterialModule.forRoot()
  ],
  declarations: [ DepartmentsComponent ]
})
export class DepartmentsModule {}

full-layout.component.ts

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

@Component({
  selector: 'app-dashboard',
  templateUrl: './full-layout.component.html',
})
export class FullLayoutComponent implements OnInit {
  public disabled:boolean = false;
  public status:{isopen:boolean} = {isopen: false};
  constructor (){}
  ngOnInit (): void {}


  dropDownItems = [
    { routerLink: '/departments',               name: 'Artshums' },
    { routerLink: '/components/social-buttons', name: 'Dentistry' },
    { routerLink: '/components/cards',          name: 'Law' },
    { routerLink: '/components/forms',          name: 'IOPPN' },
    { routerLink: '/components/modals',         name: 'LSM' },
    { routerLink: '/departments',               name: 'NMS' },
    { routerLink: '/components/tables',         name: 'Nursing' },
    { routerLink: '/components/tabs',           name: 'SSPP' },
    { routerLink: '/components/tabs',           name: 'Health' }
  ];

  onClick(_container: HTMLElement) {
    //this.clickedElement = _container.innerText;
    //console.log(this.clickedElement);
  }
}

full-layout.component.html

<ul class="nav-dropdown-items">
    <li class="nav-item" *ngFor="let item of dropDownItems">
        <a #clicked class="nav-link" routerLinkActive="active" [routerLink]="[item.routerLink]" (click)="onClick(clicked)">
            <i class="icon-puzzle"></i>{{item.name}}
            <app-departments [valueToPass] = "item"></app-departments>
        </a>
    </li>
</ul>

app.module.ts

// import {...}...
// assume necessary imports

@NgModule({
  imports: [
    BrowserModule,
    AppRoutingModule,
    DropdownModule.forRoot(),
    TabsModule.forRoot(),
    ChartsModule,
    MaterialModule.forRoot(),
    HttpModule,
    JsonpModule,
    DepartmentsModule
  ],
  declarations: [
    AppComponent,
    FullLayoutComponent,
    SimpleLayoutComponent,
    NAV_DROPDOWN_DIRECTIVES,
    BreadcrumbsComponent,
    SIDEBAR_TOGGLE_DIRECTIVES,
    AsideToggleDirective
  ],
  providers: [{
    provide: LocationStrategy,
    useClass: HashLocationStrategy
  }],
  bootstrap: [ AppComponent ]
})
export class AppModule { }

我的问题就出在这里。当我 运行 这个程序时,我遇到了绑定错误,我不确定为什么以及如何修复它。

无法绑定到 'valueToPass',因为它不是 'app-departments' 的已知 属性。

  1. 如果 'app-departments' 是一个 Angular 组件并且它有 'valueToPass' 输入,然后验证它是该模块的一部分。

  2. 如果 'app-departments' 是 Web 组件,则将“CUSTOM_ELEMENTS_SCHEMA”添加到此组件的“@NgModule.schemas”以禁止显示此消息。

如果能提供小小的帮助,我们将不胜感激。

谢谢冠军!

当您使用自定义选择器时,就像您使用这个:<app-departments>,有时您需要将 "CUSTOM_ELEMENTS_SCHEMA" 添加到“@NgModule.schemas”以避免错误。通过将 "CUSTOM_ELEMENTS_SCHEMA" 添加到您的模块,您基本上是在告诉 Angular 让您向应用程序添加自定义元素。

因此,在您的根模块中,将其添加到导入中:

import { NgModule, CUSTOM_ELEMENTS_SCHEMA } from '@angular/core';

然后,在同一个根模块中,在 "imports" 下面添加 "schemas",就像这个例子:

@NgModule({
    imports: [ RouterModule, CommonModule, FormsModule ],
    schemas: [ CUSTOM_ELEMENTS_SCHEMA ]
})

另外,请注意:您似乎在此处输入错误 - "name" 中缺少 "e":

console.log(this.valueToPass.nam);