Ionic2使用FormBuilder和Validators进行表单验证

原文出处：https://blog.csdn.net/u010730897/article/details/53301931

ionic2中的form表单是验证方式是基于angular2的form验证，在angular2的form经过更新后，从以前的

import { FormBuilder, Control, ControlGroup, Validators, FORM_DIRECTIVES } from '@angular/common';

更新成了从forms中引入

import { FormBuilder, Validators, FormGroup } from '@angular/forms';

并且之前form使用的名字也存在一些变化

变化后	变化前
formGroup	ngFormModel
formControl	ngFormControl
formControlName	ngControl
formGroupName	ngControlGroup
formArrayName	ngControlGroup
FormControl()	Control
FormGroup()	ControlGroup
FormArray()	ControlArray

具体变化可以参看详情

以下为最新的使用FormBuilder进行表单验证的代码

—-login.ts—–

import { TabsPage } from './../tabs/tabs';
import { StorageService } from './../../providers/storage-service';//这里引入了一个自己创建的服务，主要用于存储用户信息
import { Component } from '@angular/core';
import { NavController } from 'ionic-angular';

import { FormBuilder, Validators, FormGroup } from '@angular/forms';


@Component({
  selector: 'page-login',
  templateUrl: 'login.html',
  providers: [StorageService]
})
export class LoginPage {

  loginForm: FormGroup;
  username: any;
  password: any;
  constructor(public navCtrl: NavController, private formBuilder: FormBuilder, public storage: StorageService) {
    this.loginForm = formBuilder.group({
      username: ['', Validators.compose([Validators.minLength(11), Validators.maxLength(11), Validators.required, Validators.pattern("^(13[0-9]|15[012356789]|17[03678]|18[0-9]|14[57])[0-9]{8}$")])],
      password: ['', Validators.compose([Validators.required, Validators.minLength(6)])]
    })
    this.username = this.loginForm.controls['username'];
    this.password = this.loginForm.controls['password'];
  }


  login(value) {
    if (value.username == "手机号码" && value.password == 123456) {
      this.storage.setUser(value);
      this.navCtrl.push(TabsPage);
    } else {
      console.log("登录失败");
    }

  }

}

—-login.html—-

<ion-header>
    <ion-navbar hideBackButton>
        <ion-title>用户登录</ion-title>
    </ion-navbar>
</ion-header>

<ion-content padding>
    <form [formGroup]="loginForm" (ngSubmit)="login(loginForm.value)" novalidate>
        <ion-item [class.error]="!username.valid && username.touched">
            <ion-label>用户名：</ion-label>
            <ion-input type="tel" placeholder="请输入用户名" value="" [formControl]="username" clearInput=true></ion-input>
        </ion-item>
        <div *ngIf="username.hasError('required') && username.touched" class="error-message">* 请输入用户名</div>
        <div *ngIf="(username.hasError('minlength')||username.hasError('maxlength')||username.hasError('pattern')) && username.touched" class="error-message">* 请输入正确的电话号码</div>
        <ion-item>
            <ion-label>密 码：</ion-label>
            <ion-input type="password" placeholder="请输入密码" value="" [formControl]="password" clearInput=true></ion-input>
        </ion-item>
        <div *ngIf="password.hasError('required') && password.touched" class="error-message">* 请输入密码</div>
        <div *ngIf="(password.hasError('minlength')) && password.touched" class="error-message">* 密码长度最少为六位</div>
        <button ion-button block color="secondary" type="submit" [disabled]="!loginForm.valid">登录</button>
    </form>
</ion-content>