如何重置 Angular 响应式表单

Question

我已经尝试过但未能找到重置我的 angular 表单的方法。

有人可以帮忙吗？

<form #thisIsAForm>
  <mat-form-field class="full-width">
    <input matInput placeholder="Weather">
  </mat-form-field>
</form>
<button mat-raised-button (click)="resetForm()">Reset</button>

export class Example{
  @ViewChild('thisIsAForm') thisIsAForm;

  resetForm() {
    this.thisIsAForm.reset();
  }
}

Answer 1

差不多！为此使用反应形式：

<form [formGroup]="myForm">
  <mat-form-field class="full-width">
    <input matInput placeholder="Weather" formControlName="weather">
  </mat-form-field>
</form>
<button mat-raised-button (click)="myForm.reset()">Reset</button>


export class Example{
  myForm: FormGroup;

  constructor(private fb: FormBuilder) { 
    this.myForm = fb.group({
      weather: ''
    });
  }

  // If the HTML code doesn't work, simply call this function
  reset() {
    this.myForm.reset();
  }
}

Answer 2

<form [formGroup]="thisIsAForm" (ngSubmit)="onSubmit()">
  <mat-form-field class="full-width">
    <input formControlName="weather" placeholder="Weather">
  </mat-form-field>
</form>
<button mat-raised-button (click)="resetForm()">Reset</button>


export class Example{
  thisIsAForm: FormGroup;

  constructor() {
    this.thisIsAForm = new FormGroup(
      weather: new FormControl('')
    ); 
  }

  resetForm() {
    this.thisIsAForm.reset();
  }
}

Answer 3

这里我要重置 template-driven 表单而不会使表单变脏。

    <form class="example-form" #charreplaceform="ngForm">
          <mat-form-field class="example-full-width">
            <input matInput #codepointSel="ngModel" (change)="createReplacementChar()" (keyup)="checkForNumber()"
              required [(ngModel)]="charReplaceInfo.codePoint" name="code-point" placeholder="Code Point (Only number)"
              [disabled]="isDisabled">
          </mat-form-field>

          <a (click)="refreshCharRecord(charreplaceform)">
            <i class="material-icons">
              loop
            </i>
          </a>
    </form>

    // in .ts
    refreshCharRecord(form: NgForm) { // getting the form reference from template 
    form.form.reset();   // here we are resetting the form without making form dirty
  }

Answer 4

在Angular8，如果你这样做

<form #form="ngForm" (ngSubmit)="process(form)">

process(form: NgForm) { ...

使用 --prod

构建时会出现以下错误

Argument of type 'FormGroupDirective' is not assignable to parameter of type 'NgForm'.

在 (ngSubmit)

我所做的是将 form 模板引用注入为 FormGroupDirective 然后调用 resetForm().

<form #form (ngSubmit)="process(form)">

@ViewChild('form', { static: false }) FormGroupDirective formDirective;

见FormGroupDirective

Answer 5

我认为您需要在 html 代码中添加 ngForm 指令，如下所述，stackbliz 示例还将名称和 ngModel ngControl 添加到表单元素中。

Stackbliz: Template Driven Form Reset

Answer 6

对我来说，向重置按钮添加 type="reset" 解决了问题

<button **type = "reset"** mat-raised-button (click)="resetForm()">Reset</button>

如何重置 Angular 响应式表单

How can I reset Angular Reactive Form

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angular-reactive-forms