如何将表单提交数据推送到数组

Question

我正在使用 Angular 版本 9。我创建了一个包含 5 个字段的表单，称为全名、电子邮件、电话、公司、地址。我在表单中使用 ngForm 指令来获取每次提交时提交的数据，并处理 ngSubmit 事件来获取表单数据。但我无法将该对象添加到数组中。如何实现这一目标？这是我的代码...import { Component, OnInit } from '@angular/core';import { NgForm, EmailValidator } from '@angular/forms';import { ContactListService } from '../contact-list.service';import { JsonPipe } from '@angular/common';@Component({  selector: 'app-new-contact',  templateUrl:'./new-contact.component.html',  styleUrls: ['./new-contact.component.css']})export class NewContactComponent implements OnInit {  constructor(private contactList: ContactListService) { }  arraydata:formData[];  ngOnInit(): void {  }  data(f:NgForm){  this.arraydata.push(f.value);  }}interface formData{  fullName:string;  email:string;  phone:number;  company:string;  address:string;}<form #f="ngForm" (ngSubmit)="data(f)">    <div class="form-group row">        <label for="fullName" class="col-sm-2 col-form-label">Full Name</label>        <div class="col-sm-10">            <input type="text" required ngModel name="fullName" name="fullName" class="form-control"                id="fullName" placeholder="Please Enter Your Full Name">        </div>    </div>    <div class="form-group row">        <label for="email" class="col-sm-2 col-form-label">Email</label>        <div class="col-sm-10">            <input type="email" required ngModel name="email" name="email" class="form-control" id="email"                placeholder="Please Enter Your Email">        </div>    </div>    <div class="form-group row">        <label for="phone" class="col-sm-2 col-form-label">Phone</label>        <div class="col-sm-10">            <input type="number" required ngModel name="phone" name="phone" class="form-control" id="phone"                placeholder="Please Enter Your Phone Number">        </div>

Answer 1

您尚未初始化数组 arraydata。因此它在您的组件中未定义。

只需将 arraydata 初始化为一个空数组，如下所示

arraydata:formData[] =[]

Answer 2

工作演示StackBlitz 链接

只需分配formData空数组...

  arraydata:FormData [] = [];

然后一切正常..