stock:this.fb.array([]) },{validator: StockValidators.checkStockExist}); 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 ...
function customValidator(control: AbstractControl): ValidationErrors | null { if (control.value === 'something') { return { customError: true, message: 'Invalid value' }; } return null; } 确保你的自定义验证器函数正确地返回验证结果。 表单控件的状态未正确更新:Angular的表单控件有多种状态,如...
mkdir src/shared 然后,在这个新目录中,创建一个新的url.validator.ts文件。在代码编辑器中打开此文件并添加以下代码: import { AbstractControl } from '@angular/forms';export function ValidateUrl(control: AbstractControl) {if (!control.value.startsWith('https') || !control.value.includes('.io')) {...
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 用来构建表单数据 2. formGroup 表示表单类型 3....
</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。具体的 UI 效果图如下: ...
import {AbstractControl, NG_VALIDATORS, Validator} from'@angular/forms'; @Directive({ selector: `[formControl][no-special-chars], [formControlName][no-special-chars], [ngModel][no-special-chars]`, providers: [ { multi:true, provide: NG_VALIDATORS, ...
// 基于controlsConfig、extra信息,创建FormGroup对象 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, ...
{provide: NG_VALIDATORS, useExisting: CustomValidatorDirective, multi: true}] }) export class CustomValidatorDirective implements Validator { @Input('customValidator') customValidation: string; validate(control: AbstractControl): {[key: string]: any} | null { const value = control.value; // ...
See step-by-step how to create a custom validator in a reactive Angular form with a login screen that requires a confirmation password to match the original password.
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]; const matchingContro...