mat-form-field必须包含MatFormFieldControl

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

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
  ],

2020-04-18 13:59:12

其他回答

你可以在你的mat-form-field标签中设置appearance="fill"，这对我来说很有用

<form class="example-form">
  <mat-form-field class="example-full-width" appearance="fill">
    <mat-label>Username Or Email</mat-label>
    <input matInput placeholder="Username Or Email" type="text">
  </mat-form-field>

  <mat-form-field class="example-full-width" appearance="fill">
    <mat-label>Password</mat-label>
    <input matInput placeholder="Password" type="password">
  </mat-form-field>
</form>

2020-06-04 11:36:33

我不小心从输入字段中删除了matInput指令，这导致了同样的错误。

eg.

<mat-form-field>
   <input [readOnly]="readOnly" name="amount" formControlName="amount" placeholder="Amount">
</mat-form-field>

固定的代码

 <mat-form-field>
   <input matInput [readOnly]="readOnly" name="amount" formControlName="amount" placeholder="Amount">
</mat-form-field>

2019-05-21 14:05:20

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
  ],

2020-04-18 13:59:12

每个人都解释了他是如何解决这个问题的，但没有一个答案解决了我的问题，当我发现在做这些答案中解释的所有事情之前，

你必须安装(添加)角材料到你的项目

ng add @angular/material

对我来说，这就是问题的原因。

2021-12-12 10:13:19

对我来说，错误是由于在<mat-form-field></mat-form-field>中缺少<input>和formControl属性

<form [formGroup]="FormName">
    <mat-form-field>
    <mat-label>Name</mat-label>
    </mat-form-field>
</form>

哪个是错误的… 正确的如下所示

<form [formGroup]="FormName">
    <mat-form-field>
    <mat-label>Name</mat-label>
    <input matInput formControlName="name">
    </mat-form-field>
</form>

2021-05-10 14:51:55

mat-form-field必须包含MatFormFieldControl

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