Angular 6 Material form reset使验证错误出现[重复]

Question

当我第一次加载页面时，表单是这样的

但在我成功创建公告后，我使用this.announcementCreateForm.reset() 代码重置页面，并通过以下方式重置

我在ngOnInit()期间调用下面的方法buildAnnouncementForm()

 private buildAnnouncementForm() {
    this.announcementCreateForm = this.fb.group({
      announcementTitle: ['', [Validators.required]],
      announcementText: '',
      announcementFor: ['', [Validators.required]],
      announcementType: ['', [Validators.required]],
      announcementFromDate: [this.announcementFromDate, Validators.required],
      announcementToDate: [this.announcementToDate, Validators.required]
    });
  }

我在success之后调用reset方法

resetAnnouncementPage() {
    if (this.announcementCreateForm.valid) {
      console.log("Reset...");
      this.announcementCreateForm.reset();
      this.announcementCreateForm.markAsPristine();
      //this.announcementCreateForm.markAsUntouched();
    }
  }

我的重置，希望我在加载过程中将表单带入..怎么做？

Answer 1

如果您想将表单恢复为初始状态，则将该状态存储在一个值中，并在您想重置表单时使用它来设置表单值， 不要这样做form.reset()，它甚至会从 from 控件中删除空字符串。

initialFormValue = {
    announcementTitle: '',
    announcementText: '',
    announcementFor: '',
    announcementType: '',
    announcementFromDate: this.announcementFromDate,
    announcementToDate: this.announcementToDate
}

resetAnnouncementPage() {
    if (this.announcementCreateForm.valid) {
      console.log("Reset...");
      this.announcementCreateForm.setValue(this.initialFormValue);
      this.announcementCreateForm.markAsPristine();
    }
}

编辑

您还可以在执行reset() 表单时传递要重置的值。

private _initialValue

private buildAnnouncementForm() {

    this.announcementCreateForm = this.fb.group({
      announcementTitle: ['', [Validators.required]],
      announcementText: '',
      announcementFor: ['', [Validators.required]],
      announcementType: ['', [Validators.required]],
      announcementFromDate: [this.announcementFromDate, Validators.required],
      announcementToDate: [this.announcementToDate, Validators.required]
    });

    this._initialValue = this.announcementCreateForm.value

}

resetAnnouncementPage() {

    if (this.announcementCreateForm.valid) {
      this.announcementCreateForm.reset(this._initialValue);
    }

}

Answer 2

我按照这些步骤完成了它

将 formDirective 添加到表单并将其传递给我的onSubmit 方法

 <form #formDirective="ngForm" (ngSubmit)="onSubmit(formDirective)" [formGroup]="announcementCreateForm">

首先将formDirective 参数传递给我的reset 方法，然后将reset formDirective 传递给reset form

resetAnnouncementPage(formDirective:FormGroupDirective) {
    if (this.announcementCreateForm.valid) {
      formDirective.resetForm();
      this.announcementCreateForm.reset();
    }
  }