Angular 反应式表单设置和清除验证器 [英] Angular reactive forms set and clear validators

问题描述

请协助，我想删除表单中的所有验证器，请告知是否可行，如果不可行，如果您有一个包含 20 个或更多表单控件的表单组，则删除验证器的更好方法是什么，请参见下面的示例.

Please assist, i want to remove all validators in form, Please advise if its possible or not and if not whats the better way to remove validators if you have a form Group of 20 or more form controls, see example below.

 ngOnInit() {
    this.exampleFormGroup = this.formBuilder.group({
     surname: ['', [Validators.required, Validators.pattern('^[\\w\\s/-/(/)]{3,50}$')]],
     initials: ['', [Validators.required, Validators.maxLength(4)]]
     });
  }

 public removeValidators() {
    this.exampleFormGroup.get('surname').clearValidators();
    this.exampleFormGroup.get('initials').clearValidators();
    this.exampleFormGroup.updateValueAndValidity();
 }

 public addValidators() { 
  this.exampleFormGroup .get('surname').setValidators([Validators.required,Validators.pattern('^[\\w\\s/-/(/)]{3,50}$')]);
  this.exampleFormGroup.get('initials').setValidators([Validators.required, Validators.maxLength(4)]);
  this.exampleFormGroup.updateValueAndValidity(); 
 }

上述方法 addValidators() 将添加验证器，removeValidators() 将在执行时删除验证器.但我遇到的问题是，我必须指定我试图清除验证器的表单控件.有没有办法只执行 this.exampleFormGroup.clearValidators(); 并清除表单中的所有内容，然后再次 this.exampleFormGroup.setValidators() 将它们设置回来.我知道我可能需要一个独角兽，但在 formGroup 有 20 个或更多控件清除和设置验证器的情况下可能会很痛苦，因此非常感谢有关如何处理此类情况的地图.

The above method addValidators() will add validators and removeValidators() will remove validators when executed. but the problem i have is, i have to specify the form control im trying to clear validators. is there a way to just do this.exampleFormGroup.clearValidators(); and clear all in the form and again this.exampleFormGroup.setValidators() to set them back. i know i may be asking for a unicorn but in a scenario where the formGroup has 20 or more controls clearing and setting validators can be painful so a map on how to handle such scenarios will be much appreciated.

推荐答案

你可以这样做:

validationType = {
    'surname': [Validators.required, Validators.pattern('^[\\w\\s/-/(/)]{3,50}$')],
    'initials': [Validators.required, Validators.maxLength(4)]
}

ngOnInit() {
    this.exampleFormGroup = this.formBuilder.group({
        surname: ['', [Validators.required, Validators.pattern('^[\\w\\s/-/(/)]{3,50}$')]],
        initials: ['', [Validators.required, Validators.maxLength(4)]]
    });
}

    public removeValidators(form: FormGroup) {
    for (const key in form.controls) {
        form.get(key).clearValidators();
        form.get(key).updateValueAndValidity();
    }
}
     

    public addValidators(form: FormGroup) {
    for (const key in form.controls) {
        form.get(key).setValidators(this.validationType[key]);
        form.get(key).updateValueAndValidity();
    }
}

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