代码之家 › 专栏 › 技术社区 › Miomir Dancevic

反应式角度验证

angular-reactive-forms validation angular

Miomir Dancevic · 技术社区 · 6 年前

我有一些像这样的反应形式:

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

像这样的价值观:

validation = false;

我的问题是我需要切换它的值验证在HTML中,基于该if 验证=真 我需要向如下字段添加验证:

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

如何实现这一点,即使我在呈现组件时有init表单?

3 回复 | 直到 6 年前

yurzui 6 年前

角度暴露我们 setValidators 方法对 AbstractControl 因此,您可以根据您的条件更改验证程序集:

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

jo_va 6 年前

这里是一个 complete StackBlitz 具有 反应形式 和 动态验证 .

我们的想法是在 validation 属性,以便在每次设置属性时使用 myControl.setValidators(validate ? [Validators.required] : null) 然后通过调用更新其有效性状态 myControl.updateValueAndValidity()

两种方法对您的 FormControl 在这里:

StValueActuffScript()
更新值和有效性()

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;
  }
}

希望有帮助!

Baruch G. 6 年前

在HTML中:

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

</button>

在你的TS:

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