NgbModule.forRoot() 给出错误“属性 'forRoot' 在类型 'typeof NgbModule'.ts 上不存在”

Question

I want to add Bootstrap modal to my Angular Project.我想将 Bootstrap 模式添加到我的 Angular 项目中。 So I installed ng bootstrap using "npm install --save @ng-bootstrap/ng-bootstrap" and then bootstrap using "npm install bootstrap@4.5.2".所以我使用“npm install --save @ng-bootstrap/ng-bootstrap”安装了ng bootstrap，然后使用“npm install bootstrap@4.5.2”进行引导。

When I add this sentence "NgbModule.forRoot()" under imports in app.module.ts it gives an error "Property 'forRoot' does not exist on type 'typeof NgbModule'."当我在 app.module.ts 中的导入下添加这句话“NgbModule.forRoot()”时，它给出了一个错误“属性 'forRoot' 在类型 'typeof NgbModule' 上不存在。”

I however tried to remove forRoot() and imported only NdbModule and ran my application.但是，我尝试删除 forRoot() 并仅导入 NdbModule 并运行我的应用程序。 But it gives the following error但它给出了以下错误

enter image description here在此处输入图片说明

When I searched online about how to remove the above error, the solution I got is to add forRoot().当我在网上搜索如何消除上述错误时，我得到的解决方案是添加forRoot()。 But it is giving error "Property 'forRoot' does not exist on type 'typeof NgbModule'."但它给出了错误“类型'typeof NgbModule'上不存在属性'forRoot'。”

app.module.ts: app.module.ts:

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import {NgbModule} from '@ng-bootstrap/ng-bootstrap';

import { AppRoutingModule } from './app-routing.module';
import { AppComponent } from './app.component';
import { LoginComponent } from './login/login.component';

@NgModule({
  declarations: [
    AppComponent,
    LoginComponent
  ],
  imports: [
    BrowserModule,
    AppRoutingModule,
    NgbModule.forRoot()
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

login.component.ts:登录.component.ts：

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

import {NgbModal, ModalDismissReasons} from '@ng-bootstrap/ng-bootstrap';

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

  title = 'appBootstrap';
  
  closeResult: string;
  
  constructor(private modalService: NgbModal) {}
    
  open(content) {
    this.modalService.open(content, {ariaLabelledBy: 'modal-basic-title'}).result.then((result) => {
      this.closeResult = `Closed with: ${result}`;
    }, (reason) => {
      this.closeResult = `Dismissed ${this.getDismissReason(reason)}`;
    });
  }
  
  private getDismissReason(reason: any): string {
    if (reason === ModalDismissReasons.ESC) {
      return 'by pressing ESC';
    } else if (reason === ModalDismissReasons.BACKDROP_CLICK) {
      return 'by clicking on a backdrop';
    } else {
      return  `with: ${reason}`;
    }
  }

  ngOnInit() {
    
  }
}

login.component.html:登录.component.html：

<h1>Modal Popup Example</h1>
   
<button class="btn btn-lg btn-outline-primary" (click)="open(mymodal)">Open My Modal</button>
   
<ng-template #mymodal let-modal>
  <div class="modal-header">
    <h4 class="modal-title" id="modal-basic-title">Bootstrap Modal</h4>
    <button type="button" class="close" aria-label="Close" (click)="modal.dismiss('Cross click')">
      <span aria-hidden="true">×</span>
    </button>
  </div>
  <div class="modal-body">
    This is a sample modal
  </div>
  <div class="modal-footer">
    <button type="button" class="btn btn-outline-dark" (click)="modal.close('Save click')">Ok</button>
  </div>
</ng-template>

index.html:索引.html：

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Testproject</title>
  <base href="/">

  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="icon" type="image/x-icon" href="favicon.ico">
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css">
</head>
<body>
  <app-root></app-root>
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.0/umd/popper.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/js/bootstrap.min.js"></script>
</body>
</html>

Angular Version: Angular CLI: 8.0.6 Node: 12.19.0 OS: win32 x64 Angular: 8.0.3 Angular 版本：Angular CLI：8.0.6 节点：12.19.0 操作系统：win32 x64 Angular：8.0.3

This is the first time I am posting a question in Stackoverflow.这是我第一次在 Stackoverflow 中发布问题。 Please suggest if I missed any details.如果我错过了任何细节，请提出建议。

Answer 1

Seems to be a compatibility issue between Angular, Bootstrap and NgBootstrap.似乎是 Angular、Bootstrap 和 NgBootstrap 之间的兼容性问题。 Please ensure you're using the correct dependencies as per NgBootstraps documentation请确保根据 NgBootstraps 文档使用正确的依赖项

Answer 2

I had the same issue while trying to install bootstrap for my angular project created using angular/cli我在尝试为使用 angular/cli 创建的 angular 项目安装引导程序时遇到了同样的问题

I followed the 'manual installation' method mentioned in https://ng-bootstrap.github.io/#/getting-started (Click on the link "Click here to hide detailed instructions" for step by step instructions)我遵循了https://ng-bootstrap.github.io/#/getting-started中提到的“手动安装”方法（单击链接“单击此处隐藏详细说明”以获取分步说明）

The main thing is checking the dependencies - ng bootstrap dependencies主要是检查依赖项 - ng bootstrap 依赖项

Explanation of what I did:我所做的解释：

As mentioned here( ng bootstrap dependencies ), for Angular 10, the dependencies are ng-bootstrap - 8.xx and Bootstrap CSS - 4.5.0正如这里提到的（ ng bootstrap 依赖项），对于 Angular 10，依赖项是ng-bootstrap - 8.xx和Bootstrap CSS - 4.5.0
```
 npm install bootstrap@4.5.0 npm install @ng-bootstrap/ng-bootstrap@8.0.0
```
Note: Use --legacy-peer-deps switch if you get dependency errors注意：如果出现依赖错误，请使用--legacy-peer-deps开关
Since I was using SCSS, added the below line in src/styles.scss由于我使用的是 SCSS，因此在src/styles.scss添加了以下行
```
@import "~bootstrap/scss/bootstrap";
```
Add ng-localize添加 ng-localize
```
 ng add @angular/localize
```
Regarding the NgbModule.forRoot() , I can confirm that it is not required in newer versions of ng-bootstrap(I tried 8.0.0) as I have got bootstrap working in my angular project without it as shown below:关于NgbModule.forRoot() ，我可以确认在较新版本的 ng-bootstrap 中不需要它（我尝试了 8.0.0），因为我的 angular 项目中没有引导程序，如下所示：
file: app.module.ts文件：app.module.ts
```
 import {NgbModule.NgbModule} from '@ng-bootstrap/ng-bootstrap'; @NgModule({ declarations:[AppComponent], imports: [NgbModule], providers: [], bootstrap: [AppComponent] }) export class AppModule { }
```

NgbModule.forRoot() 给出错误“属性 'forRoot' 在类型 'typeof NgbModule'.ts 上不存在”

问题描述

2 个解决方案

解决方案1
1 2020-11-20 04:49:50

解决方案2
1 2021-05-20 18:44:35

NgbModule.forRoot() 给出错误“属性 &#39;forRoot&#39; 在类型 &#39;typeof NgbModule&#39;.ts 上不存在”

问题描述

2 个解决方案

解决方案1 1 2020-11-20 04:49:50

解决方案2 1 2021-05-20 18:44:35

NgbModule.forRoot() 给出错误“属性 'forRoot' 在类型 'typeof NgbModule'.ts 上不存在”

解决方案1
1 2020-11-20 04:49:50

解决方案2
1 2021-05-20 18:44:35