在一个零部件中工作但在另一个零部件上不工作的有角度的材料

Question

我第一次在Angular从事与学校相关的项目。我试图通过使用表单输入材料而不是普通的HTML表单来让我的页面看起来更好，并在我的大多数组件中取得了巨大成功。然而，有一个组件特别没有识别出material标记是有效的，尽管它们在其他组件中工作得很好，在.HTML文件实现或.ts文件声明和导入中没有明显的差异(对我来说(。

它们在我的登录组件中工作，如下所示。

登录.component.html

<form [formGroup]="signInForm" (ngSubmit)="onSubmit(signInForm.value)">
<mat-form-field>
<mat-label>Employee ID:</mat-label>
<input matInput type="number" formControlName="employeeId">
</mat-form-field>
<br>
<mat-form-field>
<mat-label>Password:</mat-label>
<input matInput type="password" formControlName="password">
</mat-form-field>
<br>
<button mat-raised-button type="submit">Sign In</button>
<br>
</form>

相关的.ts文件在这里。这并不是全部，只是进口和报关。

登录组件.ts

import { Component, OnInit} from '@angular/core';
import { Router, ActivatedRoute } from '@angular/router';
import { FormGroup, FormControl } from '@angular/forms';
import { HttpClient, HttpHeaders } from '@angular/common/http';
import { environment } from '../../../environments/environment';
import { EmployeeService } from 'src/app/employee/employee.service';
import { Employee } from 'src/app/employee/employee';
@Component({
selector: 'sign-in',
templateUrl: './signin.component.html',
styleUrls: ['./signin.component.css']
})
export class SigninComponent implements OnInit{
private apiUrl = environment.baseUrl + "/api/auth";
signInForm = new FormGroup({
employeeId: new FormControl(''),
password: new FormControl(''),
});
errorMsg = null
constructor(
private employeeService: EmployeeService,
private activatedRoute: ActivatedRoute,
private router: Router,
private http: HttpClient
){}
}

当我试图在另一个组件中实现几乎完全相同的代码时，它无法识别标签。

产品详细信息.component.html

<h1><b>PRODUCT DETAILS</b></h1>
<form [formGroup]="productDetailsForm" (ngSubmit)="onSubmit(productDetailsForm.value)">
<div>    
<mat-form-field>
<mat-label for="name">Name</mat-label>
<input matInput id="name" type="text" formControlName="name">
</mat-form-field>
</div>
<div>
<mat-form-field>
<mat-label for="price">Price</mat-label>
<input matInput id="price" type="number" formControlName="price">
</mat-form-field>
</div>
<div>    
<mat-form-field>
<mat-label for="lookupCode">Name</mat-label>
<input matInput id="lookupCode" type="text" formControlName="lookupCode">
</mat-form-field>
</div>
<div>
<mat-form-field>
<mat-label for="count">Price</mat-label>
<input matInput id="count" type="number" formControlName="count">
</mat-form-field>
</div>
<button *ngIf="isManager" class="button" type="submit">Save</button>
</form>
<button mat-raised-button *ngIf="isManager" class="button" (click)="deleteClicked()">Delete</button>

相关的.ts文件如下。

产品详细信息.组件.ts

import { Component, OnInit, Input } from '@angular/core';
import { FormBuilder, FormGroup, Validators, FormControl } from '@angular/forms';
import { Product } from '../product';
import { ProductService } from '../product.service';
import { ActivatedRoute, Router } from '@angular/router';
import { UserService } from '../../services/user.service';
import { MatFormFieldModule } from '@angular/material/form-field';
@Component({
selector: 'product-detail-t',
templateUrl: './product-detail.component.html',
styleUrls: ['./product-detail.component.css'],
providers: [ProductService, UserService]
})
export class ProductDetailComponent implements OnInit {
@Input() id: string;
productDetailsForm: FormGroup;
isManager: boolean;
constructor(
private productService: ProductService,
private userService: UserService,
private formBuilder: FormBuilder,
private activatedRoute: ActivatedRoute,
private router: Router
) {
this.id = this.activatedRoute.snapshot.paramMap.get("id");
this.productDetailsForm = this.formBuilder.group({
lookupCode: new FormControl({value: '', disabled: true}),
price: new FormControl({value: '', disabled: true}),
name: new FormControl({value: '', disabled: true}),
count: new FormControl({value: '', disabled: true})
});
this.userService.isManager()
.then((isManager: boolean) => {
this.isManager = isManager;
if(isManager) {
this.productDetailsForm.controls["name"].enable();
this.productDetailsForm.controls["lookupCode"].enable();
this.productDetailsForm.controls["count"].enable();
this.productDetailsForm.controls["price"].enable();
}
});
}
}

如果有帮助的话，下面是我的app.module.ts文件。

import { BrowserModule } from '@angular/platform-browser';
import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
import { NgModule } from '@angular/core';
import { HttpClientModule, HTTP_INTERCEPTORS } from '@angular/common/http';
import { ReactiveFormsModule } from '@angular/forms';
import { MatButtonModule } from '@angular/material/button';
import { MatCardModule } from '@angular/material/card';
import { MatInputModule } from '@angular/material/input';
import { MatFormFieldModule } from '@angular/material/form-field';
import { MatToolbarModule } from '@angular/material/toolbar';
import { AppRoutingModule } from './app-routing.module';
import { AppComponent } from './app.component';
import { EmployeeModule } from './employee/employee.module';
import { ProductModule } from './product/product.module';
import { TransactionModule } from './transaction/transaction.module';
import { SigninComponent } from './components/signin/signin.component';
import { MainMenuComponent } from './components/main-menu/main-menu.component';
import { PageHeaderComponent } from './components/page-header/page-header.component';
import { HttpRequestInterceptor } from './HttpInterceptor';
import { TransactionPageComponent } from './transaction/transaction-page/transaction-page.component';
@NgModule({
declarations: [
AppComponent,
SigninComponent,
MainMenuComponent,
SigninComponent,
PageHeaderComponent,
TransactionPageComponent
],
imports: [
BrowserModule,
ReactiveFormsModule,
HttpClientModule,
EmployeeModule,
AppRoutingModule,
BrowserModule,
BrowserAnimationsModule,
ProductModule,
MatButtonModule,
MatCardModule,
MatInputModule,
MatFormFieldModule
],
exports: [
MatButtonModule,
MatCardModule,
MatInputModule,
MatFormFieldModule
],
providers: [
{ provide: HTTP_INTERCEPTORS, useClass: HttpRequestInterceptor, multi: true }
],
bootstrap: [AppComponent]
})
export class AppModule { }

我应该提到，登录组件中的表单是由我的一个小组成员创建的，但他似乎也找不到我的代码有问题。任何帮助都将不胜感激！

Answer 1

您出现该错误可能是因为您没有在ProductModule中导入MatInputModule或任何其他角度材料模块，我相信您的ProductDetailComponent是在其中声明的。