表单验证不适用于 Angular 2 Ionic 2 中的 FormBuilder

Form validation is not working with Angular 2 FormBuilder in Ionic 2

我正在构建 Ionic 2 (typescript) 应用程序。在复选框(ion-checkbox 标签)中的简单模型驱动表单验证中有问题 ONLY

我正在使用 FormBuilder 构建表单模块。我希望根据复选框输入控件的选中状态验证/不验证表单。但它只能单向工作。这是我的代码:

reg.html

<ion-content padding>
    <form class="client_profile" [formGroup]="regForm">
        <div class="profile_pic" id="profile_pix">
            <img src="build/images/home.svg" id="client_camera_pic" />
        </div>
        <ion-item>
            <ion-label floating>What we would call you?</ion-label>
            <ion-input type="text" formControlName="client_name"></ion-input>
        </ion-item>
        <ion-item>
            <ion-label floating>Choose your username</ion-label>
            <ion-input type="text" name="client_username" value="" #client_username formControlName="client_username"></ion-input>
        </ion-item>
        <ion-item>
            <ion-label floating>Where we will drop your Email?</ion-label>
            <ion-input type="email" name="client_email" value="" #client_email formControlName="client_email"></ion-input>
        </ion-item>
        <ion-item>
            <ion-label floating>We also need your phone number</ion-label>
            <ion-input type="number" name="client_phone" value="" #client_phone formControlName="client_phone"></ion-input>
        </ion-item>
        <ion-item class="reg_terms">
            <ion-checkbox secondary #terms name="terms" value="" checked="false" formControlName="terms"></ion-checkbox>
            <ion-label>I accept the <a href="#">Terms & Conditions</a></ion-label>
        </ion-item>
    </form>
    <div>
        <ion-buttons right class="client_reg_done">
            <button danger class="reg_complete" (click)="process_client_reg()" [disabled]="!regForm.valid">NEXT</button>
        </ion-buttons>
    </div>
</ion-content>

reg.ts

import { Component, ViewChild, ElementRef } from '@angular/core';
import { FORM_PROVIDERS, FormBuilder, FormControl, FormGroup, AbstractControl, Validators, REACTIVE_FORM_DIRECTIVES } from '@angular/forms';
import { App, NavController, ViewController, ModalController, LoadingController, LoadingOptions } from 'ionic-angular';

@Component({
    templateUrl: "build/pages/registration/reg.html"
})
export class Registration {
    ngAfterViewInit(){

    }

    regForm: FormGroup;

    constructor(public app: App, public nav: NavController, public viewCtrl: ViewController, public elem: ElementRef, public modalCtrl: ModalController, public loading: LoadingController, public fb: FormBuilder){

    }

    ngOnInit() {
        this.regForm = this.fb.group({
            client_name: ['', Validators.compose([Validators.required, Validators.maxLength(30), Validators.pattern('^[a-zA-Z\. ]+$')])],
            client_username: ['', Validators.compose([Validators.required, Validators.maxLength(20), Validators.pattern('[a-zA-Z0-9-_\.]+')])],
            client_email: ['', Validators.compose([Validators.required, Validators.pattern('^[a-zA-Z0-9-_]+@[a-zA-Z]+\.[a-zA-Z]{2,4}$')])],
            client_phone: ['', Validators.compose([Validators.required, Validators.pattern('^[\+0-9]{10,12}$')])],
            terms: [null, Validators.required]      
        });
    }
}

实际浏览:

选中/取消选中“条款和条件”复选框不会更新验证逻辑,'NEXT' 按钮禁用状态不会更新。这是因为表单验证没有考虑这个复选框。感谢您的帮助。

null 初始化您的 terms 控件似乎会中断更改事件的发送。尝试添加此订阅:

this.regForm.valueChanges.subscribe(v => {
  console.log('Required validation failed: ' + this.form.controls['terms'].hasError('required'));
  console.log('Required validation touched: ' + this.form.controls['terms'].touched);
  console.log('Required validation status: ' + this.form.controls['terms'].status);
});

切换条款复选框不会导致任何日志记录。这可能是一个错误。

现在将您的控件更改为初始化为 false 并重试:terms: [false, Validators.required] 这次进行日志记录,您可以看到发生了什么。

不幸的是,现在控件一加载就处于有效状态。您可以在构建 FormGroup 后使用类似的日志记录进行检查。最好的解决方案是创建一个 is-true 自定义验证器,但快速而肮脏的解决方案是更改您的按钮:

[disabled]="!regForm.valid || !form.controls.terms.touched"