Angular 表单不断返回 false（Angular 2）

Question

我在 Angular 2 中有一个表单，我正在通过模型驱动的方式对其进行验证。我想知道如何将状态从 false 更改为 true，因为我有验证规则，即使用户正确填写所有内容，它也会不断返回无效 (false)。这是 HTML 代码。

<div class="wrap-page">
  <form [formGroup]="myForm" novalidate class="form-contato" (ngSubmit)="enviarMensagem(myForm.value, myForm.valid)">
    <div class=row>
      <div class="col s12">
        <h4> Contato </h4>
      </div>
      <div class="col s12 m12 l6">
        <label> Nome: </label>
        <input type="text" name="nome" formControlName="nome" class="forms-econ" required placeholder="ex: José Silva">
        <div class="div-validar">
          <span [hidden]="myForm.controls.nome.valid || (myForm.controls.nome.pristine && !submitted)">
            Nome Inválido (mínimo 3 caracteres).
          </span>
        </div>
      </div>
      <div class="col s12 l6">
        <label> E-mail: </label>
        <input type="email" class="forms-econ" formControlName="email" required name="email" pattern="^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$"
          placeholder="exemplo@exemplo.com">
        <div class="div-validar">
          <span [hidden]="myForm.controls.email.valid || (myForm.controls.email.pristine && !submitted)">
            E-Mail inválido
          </span>
        </div>
      </div>


      <div class="col s12 l6">
        <label>Telefone: </label>
        <input type="tel" class="forms-econ" name="telefone" formControlName="telefone" pattern="[0-9]" placeholder="(xx)9 9999-99999">
      </div>
      <div class="col s12 l6">
        <label> Motivo do Contato: </label>
        <select name="assunto" formControlName="assunto" class="forms-econ">
          <option value="motivo_01">Motivo 01</option>
          <option value="motivo_02">Motivo 02</option>
          <option value="motivo_03">Motivo 03</option>
          <option value="motivo_03">Motivo 04</option>
        </select>

      </div>
      <div class="col s12">
        <label> Mensagem: </label>
        <textarea name="mensagem" formControlName="mensagem" placeholder="Mensagem..." rows="15"> 
        </textarea>
        <div class="div-validar">
          <span [hidden]="myForm.controls.mensagem.valid || (myForm.controls.mensagem.pristine && !submitted)">
            O campo mensagem é obrigatório
          </span>
        </div>
      </div>
       <div class="col s12">
        <label> ID: </label>
        <textarea name="id" formControlName="id" placeholder="Mensagem..." rows="15"> 
        </textarea>
      </div>
      <h1> {{myForm.valid | json}} </h1> // <-- Here is where I'm printing the status of the form (always return false)
      <div class="col s12 right-align">
        <input type="submit" value="Enviar" class="btn-form">
      </div>

    </div>
  </form>
</div>

这是组件。

import { Component, Input } from '@angular/core';
import {FormGroup, FormControl, FormBuilder, Validators} from '@angular/forms';
import {formContato} from './contato.interface';
import {ContatoService} from './contato.service';

@Component({
  moduleId: module.id,
  selector: 'contato',
  templateUrl: `contato.component.html`,
  providers: [ContatoService]
})
export class ContatoComponent  { 

  public contato:formContato;
  public myForm: FormGroup;
  public submitted: boolean; 
  public events: any[] = []; 

  constructor(private _fb: FormBuilder, private mensagemContato:ContatoService) { } 

    ngOnInit() {  
      this.myForm = this._fb.group({
        nome: ['', [<any>Validators.required, <any>Validators.minLength(3)]],
        email: ['', <any>Validators.required],
        telefone: ['', <any>Validators.required],
        assunto: ['', <any>Validators.required],
        mensagem: ['', <any>Validators.required],
        id: ['']
      })      
    }


    enviarMensagem(model: formContato, isValid: boolean) {
        this.submitted = true;      
        console.log(model, isValid); // -< another way to print the status of the form (always false)
    }
}

提前致谢:)

Answer 1

在 Angular 2 中，它不需要在 (ngSubmit) 上传递 valid 实体，只需将所需的表单名称传递给表单组指令。

(ngSubmit)="enviarMensagem(myForm)"


enviarMensagem({model, valid }: {model: Object, valid: boolean}) {
    this.submitted = true;      
    console.log(model, valid); 
}

Answer 2

您的问题在于电子邮件和电话验证。它们始终验证为false。

由于您使用的是响应式表单，我建议您将 pattern 检查移至您的表单构建中，例如：

email: ['', [<any>Validators.required, Validators.pattern(....)]],

然后我会假设您想从一开始就告知需要字段。这可以通过多种方式完成，这里我展示了两种可能的解决方案：

<span *ngIf="myForm.get('nome').hasError('required')">
   Name required!
</span><br>

或：

<span *ngIf="!myForm.controls.nome.pristine">
   Name required!
</span><br>

如其他答案所述，您无需在提交中传递myForm.valid。

我为你做了一个Plunker，我在其中设置了另一个电子邮件验证：

EMAIL_REGEXP = '^[a-z0-9]+(\.[_a-z0-9]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,15})$';

只是一个随机的电话号码验证，因为我不确定您需要什么样的号码验证。这一项检查电话号码是否仅包含数字。

如果您愿意，也可以在表单无效时禁用提交按钮：

<input [disabled]="!myForm.valid" type="submit" value="Enviar" class="btn-form">

但这当然取决于您！ :)

希望这会有所帮助！