如何在角度 4 中实现自动保存反应形式? [英] How to implement auto save a reactive form in angular 4?

问题描述

我想在表单有效时自动以反应形式保存内容而无需单击保存按钮.

I want to auto save content in reactive form when form is valid without clicking save button.

推荐答案

您将需要订阅 FormGroup 的 statusChanges() 方法，并且在该 Observable 中您可以确定 FormGroup 是否为有效，然后触发保存事件.

You will want to subscribe to the statusChanges() method of your FormGroup, and in that Observable you can determine whether the FormGroup is valid and then trigger a save event.

import 'rxjs/add/operator/takeWhile';
import { FormBuilder, FormGroup } from '@angular/forms';

@Component({...})
export class MyComponent {

  private form: FormGroup;
  private alive: boolean;

  constructor(private formBuilder: FormBuilder) {}

  public ngOnInit(): void {
    this.alive = true;
    this.form = this.formBuilder.group({
      // your form configuration
    });

    this.form.statusChanges()
      .takeWhile(this.alive) // only subscribe while this component is alive
      .subscribe((status) => {
        // if status is valid, auto-save
      });
  }

  public void ngOnDestroy() {
    this.alive = false;
  }
}

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