如何重置 Angular Reactive Form

Question

我尝试过但未能找到重置我的角度形式的方法。

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

在 Angular 8 中，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

“FormGroupDirective”类型的参数不可分配给“NgForm”类型的参数。

在(ngSubmit)

我所做的是将form模板引用作为FormGroupDirective注入，然后调用resetForm() 。

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

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

见FormGroupDirective

Answer 4

我认为您需要在 html 代码中添加 ngForm 指令，如下面提到的 stackbliz 示例还添加 name 和 ngModel ngControl 以形成元素。

Stackbliz：模板驱动表单重置

Answer 5

在这里，我正在重置模板驱动的表单，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 6

清除表格及其错误状态（脏污，原始等）的最简单，最干净的方法

this.formName.reset();

有关此处表单读取的更多信息

https://angular.io/docs/ts/latest/guide/forms.html

要么

只需重置特定控件（在这种情况下为“单选按钮”）

this.myForm.get('radioButtonControl').reset()

Answer 7

对我来说，将 type="reset" 添加到重置按钮解决了问题

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