Angular 7 NGB 手風琴菜單未呈現

Question

我試圖直接從 ng bootstrap 站點渲染以下手風琴菜單：

<div class="container-fluid">
  <div class="col-sm-12">
    <h1 class="text-center">
      Discounts
    </h1>
    <div class="row">
      <ngb-accordion #acc="ngbAccordion">
        <ngb-panel id="toggle-1" title="First panel">
          <ng-template ngbPanelContent>
            Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry richardson ad squid. 3 wolf moon officia
            aute, non cupidatat skateboard dolor brunch. Food truck quinoa nesciunt laborum eiusmod. Brunch 3 wolf moon tempor,
            sunt aliqua put a bird on it squid single-origin coffee nulla assumenda shoreditch et. Nihil anim keffiyeh helvetica,
            craft beer labore wes anderson cred nesciunt sapiente ea proident. Ad vegan excepteur butcher vice lomo. Leggings
            occaecat craft beer farm-to-table, raw denim aesthetic synth nesciunt you probably haven't heard of them accusamus
            labore sustainable VHS.
          </ng-template>
        </ngb-panel>
        <ngb-panel id="toggle-2" title="Second">
          <ng-template ngbPanelContent>
            Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry richardson ad squid. 3 wolf moon officia
            aute, non cupidatat skateboard dolor brunch. Food truck quinoa nesciunt laborum eiusmod. Brunch 3 wolf moon tempor,
            sunt aliqua put a bird on it squid single-origin coffee nulla assumenda shoreditch et. Nihil anim keffiyeh helvetica,
            craft beer labore wes anderson cred nesciunt sapiente ea proident. Ad vegan excepteur butcher vice lomo. Leggings
            occaecat craft beer farm-to-table, raw denim aesthetic synth nesciunt you probably haven't heard of them accusamus
            labore sustainable VHS.
          </ng-template>
        </ngb-panel>
      </ngb-accordion>
    </div>
      .
      .
      .

我們有 angular 7，ng-bootstrap 4+，據我所知，一切都應該可以工作。 我們現在很茫然。 這是我的應用程序模塊：

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { FormsModule, ReactiveFormsModule } from '@angular/forms';
import { HttpClientModule } from '@angular/common/http';
import { AppRoutingModule } from './app-routing.module';
import { AppComponent } from './app.component';
import { NavMenuTopComponent } from './views/common/nav-menu-top/nav-menu-top.component';
import { LoginComponent } from './views/common/login.component';
import { Ng2SmartTableModule } from 'ng2-smart-table';
import { AdministrationAnnouncementsComponent } from './views/administration/announcements/administrationAnnouncements.component';
import { AdministrationAppointmentsComponent } from './views/administration/appointments/administrationAppointments.component';
//import { AdministrationAppointmentsComponent } from './views/administration/appointments/administrationAppointments_2.component';
import { AdministrationArchivesComponent } from './views/administration/archives/administrationArchives.component';
import { AdministrationCallsComponent } from './views/administration/calls/administrationCalls.component';
import { AdministrationCompaniesComponent } from './views/administration/companies/administrationCompanies.component';
import { AdministrationCustomersComponent } from './views/administration/customers/administrationCustomers.component';
import { AdministrationEmployeesComponent } from './views/administration/employees/administrationEmployees.component';
import { AdministrationInvoicesComponent } from './views/administration/invoices/administrationInvoices.component';
import { AdministrationObservationsComponent } from './views/administration/observations/administrationObservations.component';
import { AdministrationProblemsComponent } from './views/administration/problems/administrationProblems.component';
import { AdministrationQuickInvoicesComponent } from './views/administration/quickInvoices/administrationQuickInvoices.component';
//import { TechnicianAppointmentsComponent } from './views/technician/appointments/technicianAppointments.component';
//import { TechnicianDiscountsComponent } from './views/technician/discounts/technicianDiscounts.component';
//import { TechnicianHomeComponent } from './views/technician/home/technicianHome.component';
//import { TechnicianInvoicesComponent } from './views/technician/invoices/technicianInvoices.component';
//import { TechnicianOptionsComponent } from './views/technician/options/technicianOptions.component';
//import { TechnicianProblemsComponent } from './views/technician/problems/technicianProblems.component';
//import { TechnicianReviewsComponent } from './views/technician/reviews/technicianReviews.component';
//import { TechnicianSolutionsComponent } from './views/technician/solutions/technicianSolutions.component';
import { jqxGridComponent } from 'jqwidgets-scripts/jqwidgets-ts/angular_jqxgrid';
import { JwtModule } from '@auth0/angular-jwt';
import { AdminAuthGuard } from './guards/admin-auth-guard.service';
import { TechAuthGuard } from './guards/tech-auth-guard.service';
import { companyList } from './views/administration/partials/companyList/companyList.component';
import { employeeForm } from './views/administration/partials/employeeForm/employeeForm.component';
import { ButtonRenderComponent } from './views/administration/partials/button-render/button.render.component';
import { employeeSelectForm } from './views/administration/partials/employeeSelectForm/employeeSelectForm.component';
import { customerForm } from './views/administration/partials/customerForm/customerForm.component';
import { cityStateZipSelector } from './views/administration/partials/cityStateZipSelector/cityStateZip.component';
import { customerCreateModal } from './views/administration/partials/customerCreationModal/customerCreationModal.component';
import { NgbModule } from '@ng-bootstrap/ng-bootstrap';
import { createCustomerForm } from './views/administration/partials/createCustomerForm/createCustomerForm.component';
import { customerUpdateForm } from './views/administration/partials/customerUpdateForm/customerUpdateForm.component';
import { employeeCreateForm } from './views/administration/partials/employeeCreateForm/employeeCreateForm.component';
import { CounterComponent } from './views/common/counter/counter.component';
import { jqxSchedulerComponent } from 'jqwidgets-scripts/jqwidgets-ts/angular_jqxscheduler';
import { TaskManagementComponent } from './views/administration/taskManagement/taskManagement.component';
import { TaskManagementHomeComponent } from './views/administration/taskManagement/taskManagementHome/taskManagementHome.component';
import { ToastrModule } from 'ngx-toastr';
import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
import { TaskManagementCategoriesComponent } from './views/administration/taskManagement/taskManagementCategories/taskManagementCategories.component';
import { DemoTechComponent } from './views/technician/demoHome/demoHome.component';
import { AppointmentMaintenance } from './views/technician/appointmentMaintenance/appointmentMaintenance.component';
import { getCompanySalesTax } from './views/administration/partials/getCompanySalesTax/getCompanySalesTax.component';
import { getEmployeeList } from './views/administration/partials/employeeList/employeeList.component';
import { getObservationsList } from './views/administration/partials/ObservationsList/observationsList.component';
import { getCategorySubcategoryList } from './views/administration/partials/CategorySubcategoryList/categorySubcategory.component';
import { ObservationsComponent } from './views/technician/observations/observations.component';
import { FindingsComponent } from './views/technician/findings/findings.component';
import { TechOptionsComponent } from './views/technician/tech-options/tech-options.component';
import { CustomerReviewComponent } from './views/technician/customer-review/customer-review.component';
import { DiscountsComponent } from './views/technician/discounts/discounts.component';
import { MaterialNotesComponent } from './views/technician/material-notes/material-notes.component';
import { TechHomeComponent } from './views/technician/techHome/techHome.component';
import { SalesTaxFormComponent } from './views/administration/partials/salesTaxForm/salesTaxForm.component';
import { environment } from '../environments/environment';
import { AnnouncementsDisplayComponent } from './views/technician/partials/announcements/announcements.component';
import { optionCopyMenuComponent } from './views/technician/partials/optionCopy/optionCopyMenu.component';
import { TechLayoutComponent } from './views/common/techLayout/techLayout.component';
import { AdminLayoutComponent } from './views/common/adminLayout/adminLayout.component';
import { AppointmentDetails } from './views/technician/appointmentDetails/appointmentDetails.component';
import { techHeaderComponent } from './views/technician/partials/techHeader/techHeader.component';
import { DiscountFormComponent } from './views/administration/partials/companyDiscountsForm/discountsForm.component';
import { ServiceChargeFormComponent } from './views/administration/partials/companyServiceChargeForm/serviceChargeForm.component';
import { ObservationListComponent } from './views/technician/partials/observationList/observationList.component';
import { FontAwesomeModule } from '@fortawesome/angular-fontawesome';

export function jwtTokenGetter() {
  return sessionStorage.getItem("fleetbooks_JWT");
};

@NgModule({
  declarations: [
    AppComponent,
    NavMenuTopComponent,
    LoginComponent,
    AdministrationAnnouncementsComponent,
    AppointmentDetails,
    AdministrationAppointmentsComponent,
    AdministrationArchivesComponent,
    AdministrationCallsComponent,
    AdministrationCompaniesComponent,
    AdministrationCustomersComponent,
    AdministrationEmployeesComponent,
    AdministrationInvoicesComponent,
    AdministrationObservationsComponent,
    AdministrationProblemsComponent,
    AdministrationQuickInvoicesComponent,
    //TechnicianAppointmentsComponent,
    //TechnicianDiscountsComponent,
    //TechnicianHomeComponent,
    //TechnicianInvoicesComponent,
    //TechnicianOptionsComponent,
    //TechnicianProblemsComponent,
    //TechnicianReviewsComponent,
    //TechnicianSolutionsComponent,
    jqxGridComponent,
    jqxSchedulerComponent,
    companyList,
    employeeForm,
    employeeSelectForm,
    employeeCreateForm,
    customerForm,
    cityStateZipSelector,
    createCustomerForm,
    customerUpdateForm,
    customerCreateModal,
    CounterComponent,
    TaskManagementComponent,
    TaskManagementHomeComponent,
    TaskManagementCategoriesComponent,
    DemoTechComponent,
    AppointmentMaintenance,
    getEmployeeList,
    getCompanySalesTax,
    getObservationsList,
    getCategorySubcategoryList,
    ButtonRenderComponent,
    ObservationsComponent,
    FindingsComponent,
    TechOptionsComponent,
    CustomerReviewComponent,
    DiscountsComponent,
    MaterialNotesComponent,
    TechHomeComponent,
    SalesTaxFormComponent,
    AnnouncementsDisplayComponent,
    TechLayoutComponent,
    AdminLayoutComponent,
    optionCopyMenuComponent,
    techHeaderComponent,
    DiscountFormComponent,
    ServiceChargeFormComponent,
    ObservationListComponent,
  ],
  entryComponents: [ButtonRenderComponent],
  imports: [
    Ng2SmartTableModule,
    BrowserModule,
    HttpClientModule,
    JwtModule.forRoot({
      config: {
        tokenGetter: jwtTokenGetter,
        whitelistedDomains: [environment.baseUrl],
        blacklistedRoutes: [],
      }
    }),
    NgbModule,
    FormsModule,
    ReactiveFormsModule,
    AppRoutingModule,
    BrowserAnimationsModule,
    ToastrModule.forRoot({
      timeOut: 3000,
      positionClass: 'toast-top-right',
    }),
    FontAwesomeModule
  ],
  providers: [AdminAuthGuard, TechAuthGuard],
  bootstrap: [AppComponent]
})
export class AppModule { }

我知道它很長，如果需要，我可以取出所有無用的東西。 如果需要，我也可以發布我的 package.json。 如果我檢查元素，我上面鏈接的代碼呈現如下：

<ngb-accordion activeids="ngb-panel-0" class="accordion" role="tablist" ng-reflect-active-ids="ngb-panel-0"><!----></ngb-accordion>

沒有控制台錯誤，沒有編譯錯誤，什么都沒有。 它只是沒有出現在頁面上，當我去查看檢查元素時，這就是我所看到的。

這是我正在尋找參考的教程： https : //ng-bootstrap.github.io/#/components/accordion/api

Answer 1

仔細檢查您的控制台是否有可能導致它無法呈現的錯誤。