我们正试图在我们公司建立我们自己的形式场组件。我们试图这样包装材料设计的组件:

字段:

<mat-form-field>
    <ng-content></ng-content>
    <mat-hint align="start"><strong>{{hint}}</strong> </mat-hint>
    <mat-hint align="end">{{message.value.length}} / 256</mat-hint>
    <mat-error>This field is required</mat-error>
</mat-form-field>

文本框:

<field hint="hint">
    <input matInput 
    [placeholder]="placeholder" 
    [value]="value"
    (change)="onChange($event)" 
    (keydown)="onKeydown($event)" 
    (keyup)="onKeyup($event)" 
    (keypress)="onKeypress($event)">
</field>

用法:

<textbox value="test" hint="my hint"></textbox>

结果大致如下:

<textbox  placeholder="Personnummer/samordningsnummer" value="" ng-reflect-placeholder="Personnummer/samordningsnummer">
  <field>
    <mat-form-field class="mat-input-container mat-form-field">
      <div class="mat-input-wrapper mat-form-field-wrapper">
        <div class="mat-input-flex mat-form-field-flex">
          <div class="mat-input-infix mat-form-field-infix">
            <input _ngcontent-c4="" class="mat-input-element mat-form-field-autofill-control" matinput="" ng-reflect-placeholder="Personnummer/samordningsnummer" ng-reflect-value="" id="mat-input-2" placeholder="Personnummer/samordningsnummer" aria-invalid="false">
            <span class="mat-input-placeholder-wrapper mat-form-field-placeholder-wrapper"></span>
          </div>
        </div>
        <div class="mat-input-underline mat-form-field-underline">
          <span class="mat-input-ripple mat-form-field-ripple"></span>
        </div>
        <div class="mat-input-subscript-wrapper mat-form-field-subscript-wrapper"></div>
      </div>
    </mat-form-field>
  </field>
</textbox>

但是我在控制台得到“mat-form-field必须包含MatFormFieldControl”。我猜这与mat-form-field不直接包含matinput字段有关。但它包含了它,只是在ng-content投影中。

以下是闪电战: https://stackblitz.com/edit/angular-xpvwzf


当前回答

我也有同样的问题

问题很简单

只有两个模块必须导入到项目中

MatFormFieldModule MatInputModule

其他回答

你可以尝试按照这个指南来实现/提供你自己的MatFormFieldControl

我也有这个问题,我有<mat-select>元素在我的模板,当我导入MatSelectModule到模块,它的工作,它没有意义,但我仍然希望它能帮助你。

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

imports: [
    BrowserModule,
    BrowserAnimationsModule,
    MatSidenavModule,
    MatButtonModule,
    MatIconModule,
    MatToolbarModule,
    MatFormFieldModule,
    MatProgressSpinnerModule,
    MatInputModule,
    MatCardModule,
    MatSelectModule
],

<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>

未捕获错误:mat-form-field必须包含MatFormFieldControl。

此错误发生在导入中遗漏'MatInputModule'时,

import { MatInputModule } from '@angular/material/input'
import { MatFormFieldModule } from '@angular/material/form-field'

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

在模块中导入MatInputModule。t文件将有助于摆脱这个问题。

你需要将MatInputModule导入到app.module.ts文件中 import {MatInputModule} from '@angular/material';

import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';
import { FormsModule } from '@angular/forms';
import { IonicModule } from '@ionic/angular';
import { CustomerPage } from './components/customer/customer';
import { CustomerDetailsPage } from "./components/customer-details/customer-details";
import { CustomerManagementPageRoutingModule } from './customer-management-routing.module';
import { MatAutocompleteModule } from '@angular/material/autocomplete'
import { ReactiveFormsModule } from '@angular/forms';
import { MatFormFieldModule } from '@angular/material/form-field';
import { MatInputModule} from '@angular/material';

@NgModule({
  imports: [
    CommonModule,
    FormsModule,
    IonicModule,
    CustomerManagementPageRoutingModule,
    MatAutocompleteModule,
    MatInputModule,
    ReactiveFormsModule,
    MatFormFieldModule
  ],

我导入了模块并设置了指令,在再次执行'ng add @angular/material'后,它开始工作了。也许用ng serve重启应用就足够了