Create a directive to check no special characters allowed: import {Directive, forwardRef} from '@angular/core'; import {AbstractControl, NG_VALIDATORS, Validator} from'@angular/forms'; @Directive({ selector: `[
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....
我还在我的form group中添加了一个form group,并附上了form controls的required验证。My use case is:我想根据单个表单控件的值触发custom validation,如果自定义验证器返回为invalid,则将表单控件标记为有错误。My issue is that:一旦将form controls标记为错误,自定义< 浏览1提问于2018-04-11得票数 1 回答已...
打开app.component.ts并用以下代码替换内容: 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',sty...
this.fb.array([]):这个方法创建了一个空的FormArray。FormArray允许你动态管理一个数组形式的控件集合。可以想象成表单中一组动态添加的复选框或输入框。 表单验证逻辑 { validators: CustomFormValidators.passwordsMustMatch( 'password', 'passwordconf' ...
: DateTimePickerComponent; public formObject?: FormValidator; ngOnInit() { // custom validator function. let customFn: (args: { [key: string]: string }) => boolean = (args: { [key: string]: string }) => { return (((this.ejDateTime as DateTimePickerComponent ).value).getFull...
[Angular] Custom directive Form validator Create a directive to check no special characters allowed: import {Directive, forwardRef} from '@angular/core'; import {AbstractControl, NG_VALIDATORS, Validator} from'@angular/forms'; @Directive({
}export function IpValidator(control: FormControl): ValidationErrors {return!control.value || /(\d{1,3}\.){3}\d{1,3}/.test(control.value) ?null: { ip:true}; }@NgModule({ declarations: [AppComponent], imports: [ BrowserModule, ...
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,
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.passwordsMu...