Angular 角度6反应形式,同步交叉场验证
@angular/forms:6.1.7 我正在尝试创建一个自定义验证器,用于检查2formControl的不一致性 按照以下步骤操作时,我在将值输入到两个表单之一时出错:Angular 角度6反应形式,同步交叉场验证,angular,angular-reactive-forms,angular-forms,Angular,Angular Reactive Forms,Angular Forms,@angular/forms:6.1.7 我正在尝试创建一个自定义验证器,用于检查2formControl的不一致性 按照以下步骤操作时,我在将值输入到两个表单之一时出错: Uncaught Error: Expected validator to return Promise or Observable. at toObservable (forms.js:596) at Array.map (<anonymous>) at FormControl.asyn
Uncaught Error: Expected validator to return Promise or Observable.
at toObservable (forms.js:596)
at Array.map (<anonymous>)
at FormControl.asyncValidator (forms.js:584)
at FormControl.push../node_modules/@angular/forms/fesm5/forms.js.AbstractControl._runAsyncValidator (forms.js:2454)
at FormControl.push../node_modules/@angular/forms/fesm5/forms.js.AbstractControl.updateValueAndValidity (forms.js:2427)
at FormControl.push../node_modules/@angular/forms/fesm5/forms.js.FormControl.setValue (forms.js:2764)
at updateControl (forms.js:1699)
at DefaultValueAccessor.onChange (forms.js:1684)
at DefaultValueAccessor.push../node_modules/@angular/forms/fesm5/forms.js.DefaultValueAccessor._handleInput (forms.js:741)
at Object.eval [as handleEvent] (ChangePasswordComponent.html:13)
实施:
import { FormGroup, ValidationErrors, ValidatorFn } from '@angular/forms';
export const passwordMatchValidator: ValidatorFn = (control: FormGroup): ValidationErrors | null => {
const password = control.get('password');
const confirmPassword = control.get('confirmPassword');
if (!password || !confirmPassword) {
return null;
}
return password === confirmPassword ? null : { passwordMismatch: true };
};
this.formGroup = this.formBuilder.group(
{
password: ['', Validators.required, Validators.minLength(6)],
confirmPassword: ['', Validators.required, Validators.minLength(6)]
},
{
validators: passwordMatchValidator
}
问题:
如何创建自定义同步跨域验证器
旁白
是否可以将formControl名称传递给函数而不是硬编码
更新:最终解决方案
实施:
this.formGroup = this.formBuilder.group(
{
password: ['', [Validators.required, Validators.minLength(6)]],
confirmPassword: ['', [Validators.required, Validators.minLength(6)]],
currentPassword: ['', Validators.required]
},
{
validator: matchValidator('password', 'confirmPassword')
}
根据文档,您应该将
验证程序
属性传递到FormBuilder
中的组
函数的额外
参数中。看见第二个问题是,在创建表单控件时,应将数组作为第二个参数传递,并直接使用formBuilder
设置验证器:
密码:[''[Validators.required,Validators.minLength(6)]
因为当前,minLength
验证器作为第三个参数被视为asyncValidator
附带问题
您可以创建一个验证器工厂函数,该函数为您创建验证器并接受2个控件:
export const passwordMatchValidator=(passwordControl:AbstractControl,confirmPasswordControl:AbstractControl):ValidatorFn=>{
返回(控件:FormGroup):ValidationErrors | null=>{
const password=passwordControl.value;
const confirmPassword=confirmPasswordControl.value;
如果(!password | |!confirmPassword){
返回null;
}
返回密码===confirmPassword?null:{passwordMismatch:true};
}
};
使用方法:
passwordMatchValidator(this.formGroup.get('password')、this.formGroup.get('confirmPassword'))
或者,工厂函数可以只获取字符串参数而不是控件,并提取表单控件本身。非常感谢!
this.formGroup = this.formBuilder.group(
{
password: ['', [Validators.required, Validators.minLength(6)]],
confirmPassword: ['', [Validators.required, Validators.minLength(6)]],
currentPassword: ['', Validators.required]
},
{
validator: matchValidator('password', 'confirmPassword')
}