如何在反应式表单中设置模型数据，Angular 9

Posted 2023-03-05

【中文标题】如何在反应式表单中设置模型数据，Angular 9

【英文标题】：How to set model data in Reactive Forms, Angular 9

【发布时间】：2020-11-07 05:29:12

【问题描述】：

我开始研究 Angular，我使用 Angular 9 和 Spring boot 创建了一个单一的 crud，但我有一个问题，我想要做的是获取下表的数据并将其移动为反应形式上传数据。 如何解决问题？

enter image description here . enter image description here

 <form [formGroup]="form" (ngSubmit)="submit()">
        <div class="form-group">
          <label for="">Nome</label>
          <input type="text" formControlName="nome" class="form-control">
        </div>
        
        <div class="form-group">
          <label for="">email</label>
          <input type="text" formControlName="email" class="form-control">
        </div>
        <div class="form-group">
          <label for="">username</label>
          <input type="text" formControlName="username" class="form-control">
        </div>

        <button  class="btn btn-outline-primary"> Salvar</button>
        <button [routerLink]="['/']" style="margin-left: 1%;"  class="btn btn-outline-warning"> Voltar</button>

      </form>

我的 app-routing.module.ts：

import  NgModule  from '@angular/core';
import  Routes, RouterModule  from '@angular/router';
import  ShowContactComponent  from './Componets/contact/show-contact/show-contact.component'
import  CreateContactComponent  from './Componets/contact/create-contact/create-contact.component'

const routes: Routes = [
  path:'', component:ShowContactComponent,
  path:'create', component:CreateContactComponent,
  path:'create/:id', component:CreateContactComponent
];

@NgModule(
  imports: [RouterModule.forRoot(routes)],
  exports: [RouterModule]
)
export class AppRoutingModule  

import  Component, OnInit  from '@angular/core';
import  FormBuilder, FormGroup, Validators  from '@angular/forms';
import  Contact  from '../contact-model/Contact';
import  ContactService  from '../../contact.service';
import  Router, ActivatedRoute  from '@angular/router';

@Component(
  selector: 'app-create-contact',
  templateUrl: './create-contact.component.html',
  styleUrls: ['./create-contact.component.css']
)
export class CreateContactComponent implements OnInit 

  form:FormGroup;
  contacts:Contact[] = []
  contact:Contact
  constructor(private service:ContactService, private router:Router, private fb:FormBuilder, private AR:ActivatedRoute)  

  ngOnInit() 
    // this.paramService();
    this.validateForms();
  

  submit()
    const formValue = this.form.value;
    const contact:Contact = new Contact(formValue.nome,  formValue.email ,formValue.username );  
    this.service.create(contact).subscribe(response =>
      this.contacts.push(response);
      this.router.navigate([''])
      console.log(response);
    )
  


  paramService()
    const formValue = this.form.value;
    const contact:Contact = new Contact(formValue.nome,  formValue.email ,formValue.username ); 
    console.log(contact);
    this.service.readOne(this.contact.id).subscribe(response =>
      
      
      this.form.patchValue(
        nome: contact.nome,
        email: contact.email,
        username: contact.username
      );
    );
  
    
  

  validateForms()
    this.form = this.fb.group(
      nome: ['', Validators.required],
      email: ['', Validators.required],
      username: ['', Validators.required]
    )
  

【参考方案1】：

你可以这样做：

validateForms(data?: Contact)
   this.form = this.fb.group(
     nome: [data.name || '', Validators.required],
     email: [data.email || '', Validators.required],
     username: [data.username || '', Validators.required]
   )

现在您应该传递数据以显示在您的表单中：

ngOnInit() 
   // const contact: Contact = ...
   this.validateForms(contact);

请将“validateForms”名称更改为“initForm”。