Angular 2에서 제출 한 후 양식을 지우는 방법은 무엇입니까?

Angular 2에서 제출 한 후 양식을 지우는 방법은 무엇입니까?

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템플릿이있는 간단한 각도 2 구성 요소가 있습니다. 제출 후 양식 및 모든 필드를 지우는 방법은 무엇입니까? 페이지를 새로 고침 할 수 없습니다. date.setValue('')필드 와 함께 설정된 데이터 는 stil touched입니다.

import {Component} from 'angular2/core';
import {FORM_DIRECTIVES, FormBuilder, ControlGroup, Validators, Control} from 'angular2/common';

@Component({
    selector: 'loading-form',
    templateUrl: 'app/loadings/loading-form.component.html',
    directives: [FORM_DIRECTIVES]
})

export class LoadingFormComponent {
    private form:ControlGroup;
    private date:Control;
    private capacity:Control;

    constructor(private _loadingsService:LoadingsService, fb:FormBuilder) {
        this.date = new Control('', Validators.required);
        this.capacity = new Control('', Validators.required);
        this.form = fb.group({
            'date': this.date,
            'capacity': this.capacity
        });
    }

    onSubmit(value:any):void {
        //send some data to backend
    }
}

loading-form.component.html

<div class="card card-block">
    <h3 class="card-title">Loading form</h3>

    <form (ngSubmit)="onSubmit(form.value)" [ngFormModel]="form">
        <fieldset class="form-group" [class.has-danger]="!date.valid && date.touched">
            <label class="form-control-label" for="dateInput">Date</label>
            <input type="text" class="form-control form-control-danger form-control-success" id="dateInput"
                   min="0" placeholder="Enter loading date"
                   [ngFormControl]="form.controls['date']">
        </fieldset>
        <fieldset class="form-group" [class.has-danger]="!capacity.valid && capacity.touched">
            <label class="form-control-label" for="capacityInput">Capacity</label>
            <input type="number" class="form-control form-control-danger form-control-success" id="capacityInput"
                   placeholder="Enter capacity"
                   [ngFormControl]="form.controls['capacity']">
        </fieldset>
        <button type="submit" class="btn btn-primary" [disabled]="!form.valid">Submit
        </button>
    </form>
</div>

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https://angular.io/docs/ts/latest/guide/reactive-forms.html ( "양식 플래그 재설정"섹션) 도 참조 하십시오.

> = RC.6

RC.6에서는 양식 모델 업데이트가 지원되어야합니다. 새 양식 그룹 생성 및 할당myForm

[formGroup]="myForm"

또한 지원됩니다 ( https://github.com/angular/angular/pull/11051#issuecomment-243483654 )

> = RC.5

form.reset();

새 양식 모듈 (> = RC.5) NgForm에는 reset()메소드가 있으며 양식 reset이벤트 도 지원합니다 . https://github.com/angular/angular/blob/6fd5bc075d70879c487c0188f6cd5b148e72a4dd/modules/%40angular/forms/src/directives/ng_form.ts#L179

<= RC.3

이것은 작동합니다.

onSubmit(value:any):void {
  //send some data to backend
  for(var name in form.controls) {
    (<Control>form.controls[name]).updateValue('');
    /*(<FormControl>form.controls[name]).updateValue('');*/ this should work in RC4 if `Control` is not working, working same in my case
    form.controls[name].setErrors(null);
  }
}

또한보십시오

• https://github.com/angular/angular/issues/6196
• https://github.com/angular/angular/issues/6169
• https://github.com/angular/angular/issues/4933
• https://github.com/angular/angular/issues/4914
• https://github.com/angular/angular/issues/6371

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Angular2 RC5 myFormGroup.reset()에서 트릭을 수행하는 것 같습니다.

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제출 후 양식을 재설정하려면을 호출하기 만하면 this.form.reset()됩니다. reset()그것을 호출 하면 :

1. 컨트롤과 자식 컨트롤을 원래 대로 표시합니다 .
2. 컨트롤 및 자식 컨트롤을 변경되지 않은 것으로 표시 합니다.
3. 컨트롤 및 자식 컨트롤의 값 을 사용자 지정 값 또는 null로 설정 합니다.
4. 영향을받는 당사자의 가치 / 유효성 / 오류 를 업데이트 합니다 .

자세한 답변을 보려면이 풀 리퀘스트 를 찾으십시오 . 참고로이 PR은 이미 2.0.0으로 병합되었습니다.

이 정보가 도움이되기를 바라며 Angular2 Forms와 관련하여 다른 질문이 있으면 알려주세요.

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import {Component} from '@angular/core';
import {NgForm} from '@angular/forms';
@Component({
    selector: 'example-app',
    template: '<form #f="ngForm" (ngSubmit)="onSubmit(f)" novalidate>
        <input name="first" ngModel required #first="ngModel">
        <input name="last" ngModel>
        <button>Submit</button>
    </form>
    <p>First name value: {{ first.value }}</p>
    <p>First name valid: {{ first.valid }}</p>
    <p>Form value: {{ f.value | json }}</p>
    <p>Form valid: {{ f.valid }}</p>',
})
export class SimpleFormComp {
    onSubmit(f: NgForm) {

        // some stuff

        f.resetForm();
    }
}

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Angular 버전 4에는 다음을 사용할 수 있습니다.

this.heroForm.reset();

그러나 다음과 같은 초기 값이 필요할 수 있습니다.

ngOnChanges() {
 this.heroForm.reset({
  name: this.hero.name, //Or '' to empty initial value. 
  address: this.hero.addresses[0] || new Address()
 });
}

개체 참조에서 null 문제를 해결하는 것이 중요합니다.

참조 링크 , "양식 플래그 재설정"을 검색하십시오.

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clearForm();.ts 파일에서 전화 걸기

Try like below example code snippet to clear your form data.

clearForm() {

this.addContactForm.reset({
      'first_name': '',
      'last_name': '',
      'mobile': '',
      'address': '',
      'city': '',
      'state': '',
      'country': '',
       'zip': ''
     });
}

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There is a new discussion about this (https://github.com/angular/angular/issues/4933). So far there is only some hacks that allows to clear the form, like recreating the whole form after submitting: https://embed.plnkr.co/kMPjjJ1TWuYGVNlnQXrU/

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I found another solution. It's a bit hacky but its widely available in angular2 world.

Since *ngIf directive removes the form and recreates it, one can simply add an *ngIf to the form and bind it to some sort of formSuccessfullySentvariable. => This will recreate the form and therefore reset the input control statuses.

Of course, you have to clear the model variables also. I found it convenient to have a specific model class for my form fields. This way i can reset all fields as simple as creating a new instance of this model class. :)

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Hm, now (23 Jan 2017 with angular 2.4.3) I made it work like this:

newHero() {
    return this.model = new Hero(42, 'APPLIED VALUE', '');
}
<button type="button" class="btn btn-default" (click)="heroForm.resetForm(newHero())">New Hero</button>

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Here is how I do it in Angular 7.3

// you can put this method in a module and reuse it as needed
resetForm(form: FormGroup) {

    form.reset();

    Object.keys(form.controls).forEach(key => {
      form.get(key).setErrors(null) ;
    });
}

There was no need to call form.clearValidators()

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Below code works for me in Angular 4

import { FormBuilder, FormGroup, Validators } from '@angular/forms';
export class RegisterComponent implements OnInit {
 registerForm: FormGroup; 

 constructor(private formBuilder: FormBuilder) { }   

 ngOnInit() {
    this.registerForm = this.formBuilder.group({
      empname: [''],
      empemail: ['']
    });
 }

 onRegister(){
    //sending data to server using http request
    this.registerForm.reset()
 }

}

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Here's how I do it Angular 8:

Get a local reference of your form:

<form name="myForm" #myForm="ngForm"></form>

@ViewChild('myForm', {static: false}) myForm: NgForm;

And whenever you need to reset the form, call resetForm method:

this.myForm.resetForm();

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You will need FormsModule from @angular/forms for it to work. Be sure to add it to your module imports.

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resetForm(){
    ObjectName = {};
}

참고URL : https://stackoverflow.com/questions/34742023/how-to-clear-form-after-submit-in-angular-2