Angular2如何将参数传递给自定义表单控件验证器?
发布时间:2020-12-17 09:57:27 所属栏目:安全 来源:网络整理
导读:我写了一个非常简单的表单控件验证器: import { Directive } from '@angular/core';import { AbstractControl,NG_VALIDATORS } from '@angular/forms';function checkboxRequiredValidator(c: AbstractControl) { return c.value ? null : { required: true
我写了一个非常简单的表单控件验证器:
import { Directive } from '@angular/core'; import { AbstractControl,NG_VALIDATORS } from '@angular/forms'; function checkboxRequiredValidator(c: AbstractControl) { return c.value ? null : { required: true }; } @Directive({ selector: '[checkbox-required-validator]',providers: [ { provide: NG_VALIDATORS,multi: true,useValue: checkboxRequiredValidator } ] }) export class CheckboxRequiredValidator { } 我想传递一个消息参数给我,我可以返回.我试过这个,但它不起作用: function checkboxRequiredValidator(c: AbstractControl,msg) { return c.value ? null : { message: msg }; } @Directive({ selector: '[checkbox-required-validator]',useValue: checkboxRequiredValidator } ] }) export class CheckboxRequiredValidator { @Input('checkbox-required-validator') msg: = 'default message'; } 任何帮助,将不胜感激
您可以将指令本身作为验证器.这样您就可以使用消息输入.
import { forwardRef } from '@angular/core'; import { Validator } from '@angular/forms'; @Directive({ selector: '[checkbox-required-validator]',providers: [ { provide: NG_VALIDATORS,useExisting: forwardRef(() => CheckboxRequiredValidator ) } ] }) export class CheckboxRequiredValidator implements Validator { @Input('checkbox-required-validator') msg = 'default message'; validate(c: AbstractControl) { return c.value ? null : { required: this.msg }; } } (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |