进入新创建的项目目录: cd angular-reactive-forms-custom-validator-example 为了使用响应式表单,您将使用ReactiveFormsModule而不是FormsModule。 在代码编辑器中打开app.module.ts并添加ReactiveFormsModule: import { BrowserModule } from '@angular/p
这段代码使用的是响应式表单(Reactive Forms),因为它更灵活,可以通过代码完全控制表单的状态和数据。响应式表单通常借助 FormBuilder 类来创建和管理表单。 代码解析 这里有两个主要部分需要解释:表单元素的创建和验证逻辑。 表单元素的创建 registerForm: UntypedFormGroup = this.fb.group( { additionalConsents: ...
创建FormGroup时,第二个参数是配置对象,用于配置表单级别的验证器,这里有一个自定义的验证器CustomFormValidators.passwordsMustMatch,它确保password和passwordconf两个控件的值必须匹配。 自定义验证器passwordsMustMatch 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...
Basic validator is just a function. import { ValidatorFn, AbstractControl, ValidationErrors }from'@angular/forms'; export function nameValidator(name:string): ValidatorFn {return(control: AbstractControl): ValidationErrors |null=>{constisValid = control.value ===''|| control.value ===name;if(is...
Custom validation properties Custom validation Object hook What is a FormGroup 我们先来看一下Angular 4.x Reactive Forms中,使用FormBuilder的示例: signup-form.component.ts import{Component,OnInit}from'@angular/core';import{FormBuilder,FormGroup,Validators}from'@angular/forms';import{User}from'./sign...
2.导入 ReactiveFormsModule app.module.ts import { NgModule, CUSTOM_ELEMENTS_SCHEMA } from '@angular/core'; import { BrowserModule } from '@angular/platform-browser'; import { ReactiveFormsModule } from '@angular/forms'; import { AppComponent } from './app.component'; ...
Angular 表单概述在 Angular 中,表单有两种主要形式:模板驱动的表单和响应式表单。这段代码使用的是响应式表单(Reactive Forms...
Reactive forms Template-driven forms This post will teach you to implement custom cross-control validator in a reactive form. One example of cross-validation could bepassword-confirm password validation, which we will implement. Let us start with creating a login form. To do that: ...
Define a custom validator: import {FormControl}from"@angular/forms"; export function validateDuration(ctrl:FormControl){constnumValue =parseInt(ctrl.value);constvalid = numValue <10;returnvalid ?null: { validateDuration: { valid:false,
Implement a global IP validator: app.module.ts: import { BrowserModule }from'@angular/platform-browser'; import { NgModule }from'@angular/core'; import { AppComponent }from'./app.component'; import { ReactiveFormsModule, FormControl, ValidationErrors }from'@angular/forms'; ...