Question

您好我使用的是角度6，我的代码如下：

import { BrowserModule } from '@angular/platform-browser';
import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';
import { RouterModule, Routes } from '@angular/router';




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


import { MatButtonModule, MatFormFieldModule, MatInputModule, MatRippleModule } from '@angular/material';
//import { MaterialModule } from 'src/app/et-shared/material.module';


const modules = [
  MatButtonModule,
  MatFormFieldModule,
  MatInputModule,
  MatRippleModule
];

@NgModule({
  declarations: [
    AppComponent,
  ],
  imports: [
    BrowserModule,
    BrowserAnimationsModule,
    CommonModule,
    RouterModule,
    AppRoutingModule,
   // MaterialModule,
   ...modules

  ],
  exports:[
    ...modules
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

和html一样

<div class="example-container">
  <mat-form-field>
    <input matInput placeholder="Input">
  </mat-form-field>

  <mat-form-field>
    <textarea matInput placeholder="Textarea"></textarea>
  </mat-form-field>

  <mat-form-field>
    <mat-select placeholder="Select">
      <mat-option value="option">Option</mat-option>
    </mat-select>
  </mat-form-field>
</div>

我的包裹

"dependencies": {
    "@angular/animations": "^6.0.0",
    "@angular/cdk": "^6.0.1",
    "@angular/common": "^6.0.0",
    "@angular/compiler": "^6.0.0",
    "@angular/core": "^6.0.0",
    "@angular/forms": "^6.0.0",
    "@angular/http": "^6.0.0",
    "@angular/material": "^6.0.1",
    "@angular/platform-browser": "^6.0.0",
    "@angular/platform-browser-dynamic": "^6.0.0",
    "@angular/router": "^6.0.0",
    "core-js": "^2.5.4",
    "hammerjs": "^2.0.8",
    "rxjs": "^6.0.0",
    "zone.js": "^0.8.26"
  },

我遇到了这个错误

'mat-form-field' is not a known element:
1. If 'mat-form-field' is an Angular component, then verify that it is part of this module.
2. If 'mat-form-field' is a Web Component then add 'CUSTOM_ELEMENTS_SCHEMA' to the '@NgModule.schemas' of this component to suppress this message. ("

<div class="example-container">
  [ERROR ->]<mat-form-field>
    <input matInput placeholder="Input">
  </mat-form-field>
"): ng:///AppRoutingModule/LoginComponent.html@7:2
'mat-form-field' is not a known element:
1. If 'mat-form-field' is an Angular component, then verify that it is part of this module.
2. If 'mat-form-field' is a Web Component then add 'CUSTOM_ELEMENTS_SCHEMA' to the '@NgModule.schemas' of this component to suppress this message. ("
  </mat-form-field>

  [ERROR ->]<mat-form-field>
    <textarea matInput placeholder="Textarea"></textarea>
  </mat-form-field>
"): ng:///AppRoutingModule/LoginComponent.html@11:2
'mat-option' is not a known element:
1. If 'mat-option' is an Angular component, then verify that it is part of this module.
2. If 'mat-option' is a Web Component then add 'CUSTOM_ELEMENTS_SCHEMA' to the '@NgModule.schemas' of this component to suppress this message. ("
  <mat-form-field>
    <mat-select placeholder="Select">
      [ERROR ->]<mat-option value="option">Option</mat-option>
    </mat-select>
  </mat-form-field>
"): ng:///AppRoutingModule/LoginComponent.html@17:6
'mat-select' is not a known element:
1. If 'mat-select' is an Angular component, then verify that it is part of this module.
2. If 'mat-select' is a Web Component then add 'CUSTOM_ELEMENTS_SCHEMA' to the '@NgModule.schemas' of this component to suppress this message. ("

为什么我得到这个错误我必须花费太多次来解决这个问题，但没有得到任何解决方案，我错了我也搜索堆栈溢出这里找到解决方案，但没有解决我的问题，请你帮忙我发现了这个错误

感谢您解决我的问题

Answer 1

尝试导入

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

在你的模块中然后注入

@NgModule({
//..your other property,
   schemas: [CUSTOM_ELEMENTS_SCHEMA]
 });

Answer 2

查看您的错误ng:///AppRoutingModule/LoginComponent.html@11:2

我可以断定您在LoginComponent中声明了AppRoutingModule但未导入MatFormFieldModule。

将LoginComponent移至decrations数组AppModule：

@NgModule({
  declarations: [
    AppComponent,
    LoginComponent
  ],
  ...
})
export class AppModule { }

或在MatFormFieldModule中导入SharedModule或某些AppRoutingModule：

@NgModule({
  declarations: [
    LoginComponent,
    ...
  ],
  imports: [
    MatFormFieldModule // or SharedModule that exports MatFormFieldModule
    ...
  ]
  ...
})
export class AppRoutingModule { }

另见：

Angular 2 Use component from another module

Answer 3

我遇到了同样的问题，对我来说，解决方法是将MatFormFieldModule，MatInputModule，MatSelectModule添加到我的材料模块中

import { MatFormFieldModule, MatInputModule } from '@angular/material';

@NgModule({
    imports: [
        MatFormFieldModule,
        MatInputModule
    ]
})
export class AppModule { }

Answer 4

您需要导入MatSelectModule：

{MatSelectModule} from '@angular/material/select';

然后将其添加到导入数组：

 imports: [
    BrowserModule,
    BrowserAnimationsModule,
    CommonModule,
    RouterModule,
    AppRoutingModule,
   // MaterialModule,
   ...modules,
   MatSelectModule
  ]

Answer 5

如果您有2个App Module示例：app-routing.module.ts和app.module.ts 导入CommonModule到第二个模块（app-routing.module.ts）

Answer 6

我也有这个问题，这取决于重新安装材料的过时安装/为我修复了该问题。

ng添加@ angular / material

Answer 7

如果您使用的是 material-ui 组件，则有一个 api 选项卡可让您知道需要将哪个模块导入到 app.module.ts 文件中。 https://material.angular.io/components/autocomplete/api

Answer 8

尽管加载了所有正确的模块，但我也看到了这一点。

原来我忘记添加新组件，请确保将其添加到模块的 declarations 数组中。

“mat-form-field”中的Angular 6错误显示不是已知元素：

8 个答案: