ReactiveForms Angular 验证

Question

我有一些这样的反应形式：

this.form = this.formBuilder.group({
      filter: [''],
      filterReason: [''],
      documentsRequired: [''],
      urgencyReason: [''],
      reportRequestedDate: [''],
      urgencyDate: [''],
      urgencyRemarks: ['']
    });

还有一些像这样的值：

validation = false;

我遇到的问题是我需要在 html 中切换 validation 的值，并基于此 if validation = true 我需要向某些字段添加验证，如下所示：

this.form = this.formBuilder.group({
      filter: [''],
      filterReason: [''],
      documentsRequired: [''],
      urgencyReason: [''],
      reportRequestedDate: ['', Validation.required],
      urgencyDate: ['', Validation.required],
      urgencyRemarks: ['', Validation.required]
    });

即使我在渲染组件时有初始化表单，该怎么做？

Answer 1

Angular 在 AbstractControl 上公开了我们的 setValidators 方法，因此您可以根据您的条件更改验证器集：

onValidationChanged(validation: boolean) {
  ['reportRequestedDate', 'urgencyDate', 'urgencyRemarks'].forEach(name => {
    this.form.get(name).setValidators(validation ? Validators.required : null);
  });
}

Answer 2

在你的 html:

<button  (click)="toggleValidation();">toggle validation

</button>

在你的 ts 中：

    toggleValidation(validation : boolean)
Object.keys(this.form).forEach(key=> {
this.form.get(key).setValidators(validation && key.*your condition* ? Validators.required : null); });}

Answer 3

Here is a complete StackBlitz with ReactiveForms and dynamic validation.

我们的想法是在 validation 属性上设置一个 setter，这样您就可以在每次使用 myControl.setValidators(validate ? [Validators.required] : null) 设置属性时切换验证器然后通过调用 myControl.updateValueAndValidity()

更新其有效性状态

这里的 FormControl 有两种方法很重要：

setValidators()
updateValueAndValidity()

import { Component } from '@angular/core';
import { FormBuilder, FormControl, Validators } from '@angular/forms';

@Component({
  selector: 'my-app',
  templateUrl: './app.component.html',
  styleUrls: [ './app.component.css' ]
})
export class AppComponent  {
  form: any;
  private _validation = true;

  constructor(private formBuilder: FormBuilder) {
    this.form = this.formBuilder.group({
        filter: ['Hello'],
        filterReason: ['Test'],
        documentsRequired: ['Document'],
        urgencyReason: ['Nothing'],
        reportRequestedDate: [''],
        urgencyDate: ['Today'],
        urgencyRemarks: ['']
      });
      this.setValidators(this.validation);
  }

  set validation(validate: boolean) {
    this._validation = validate;
    this.setValidators(validate);
  }
  get validation(): boolean {
    return this._validation;
  }

  setValidators(validate: boolean): void {
    this.reportRequestedDate.setValidators(validate ? [Validators.required] : null);
    this.reportRequestedDate.updateValueAndValidity();

    this.urgencyDate.setValidators(validate ? [Validators.required] : null);
    this.reportRequestedDate.updateValueAndValidity();

    this.urgencyRemarks.setValidators(validate ? [Validators.required] : null);
    this.urgencyRemarks.updateValueAndValidity();
  }

  onSubmit(): void {
    if (this.form.valid) {
      console.log(this.form.value);
    }
  }

  get reportRequestedDate(): FormControl {
    return this.form.get('reportRequestedDate') as FormControl;
  }

  get urgencyDate(): FormControl {
    return this.form.get('urgencyDate') as FormControl;
  }

  get urgencyRemarks(): FormControl {
    return this.form.get('urgencyRemarks') as FormControl;
  }
}

希望对您有所帮助！

ReactiveForms Angular 验证

ReactiveForms Angular validation

validation

angular

angular-reactive-forms