首先为 form 标签添加 formGroup 指令: 并且为 input 标签添加 formControlName 指令: 复制代码 代码如下: 3、在代码中定义验证规则: 从内置表单模块中导入以下类: import { FormBuilder, FormGroup, Validators } from '@angular/forms'; 其中: 1. formBuilder 用来构建表单
formGroup.controls['username'].setValue('john'); const validatorFn = CustomValidator.usernameValidator(); const result = validatorFn(formGroup.controls['username']); expect(result).toBeNull(); }); it('should return an error object if username is invalid', () => { formGroup.controls['use...
We put two custom validators into this form, one is for formControl StockValidators.checkBranch Another is for formGroup: {validator: StockValidators.checkStockExist} Notice that for formControl validators, it takes array of validator. For formGroup, it take object. And here is the validators, ...
<form novalidate [formGroup]="form"> ... </form> 接下来我们来介绍一下如何自定义 validator 指令。 Building a custom validator directive 在实际开发前,我们先来介绍一下具体需求:我们有一个新增用户的表单页面,里面包含 4 个输入框,分为用于保存用户输入的username、email、password、confirmPassword信息。具...
通过代码可以看出,验证逻辑是通过一个自定义验证器来实现的,CustomFormValidators.passwordsMustMatch是一个静态方法,它接收两个控件的名称: passwordsMustMatch(password: string, confirmPassword: string) { return (formGroup: FormGroup) => { const control = formGroup.controls[password]; ...
接下来我们来看一下group()方法的内部实现: group(controlsConfig: {[key:string]:any},extra: {[key:string]:any} =null):FormGroup{// 创建controls对象集合constcontrols =this._reduceControls(controlsConfig);// 获取同步验证器constvalidator:ValidatorFn= extra !=null? extra['validator'] :null;// ...
import { Component, OnInit } from '@angular/core';import { FormBuilder, FormGroup, Validators } from '@angular/forms';import { ValidateUrl } from '../shared/url.validator';@Component({selector: 'app-root',templateUrl: './app.component.html',styleUrls: ['./app.component.css']})export...
this.fb.array([]), }, { validators: CustomFormValidators.passwordsMustMatch( 'password', 'passwordconf' ), } ); 这个注册表单具体是由 FormBuilder 实例fb 创建的。FormBuilder 是Angular 提供的一个帮助类,它旨在简化表单的创建。 使用fb.group 创建表单组: this.fb.group 方法用来创建一个 FormGroup...
import { FormControl, FormGroup, Validators } from '@angular/forms'; const form = new FormGroup({ username: new FormControl('', Validators.required, customAsyncValidator) }); 在上面的示例中,我们将customAsyncValidator作为第三个参数传递给FormControl的构造函数,这样就会在表单控件的值发生变化时进行...
group(controlsConfig: {[key: string]: any}, extra: {[key: string]: any} = null): FormGroup {} // 基于formState、validator、asyncValidator创建FormControl对象 control( formState: Object, validator: ValidatorFn|ValidatorFn[] = null,