从Angular 8的下拉列表中获取选定值

Question

我正在开发一个单页应用程序，在前端使用 Angular 8，在后端使用 Laravel。我有一个包含输入文本字段和下拉列表的表单。文本输入字段上的值在打字稿文件中被很好地捕获，但在捕获从下拉列表中选择的值时遇到问题，以便我可以在后端提交..

~请帮忙？

Create.component.html

<form #createForm=ngForm (ngSubmit)="onSubmit()">
    <div class="form-group row">
     <div class="col-sm-6">
        <label for="formGroupExampleInput">Child SurName</label>
        <input 
            type="text" 
            name="childSurName" 
            class="form-control" 
            id="childSurName" 
            placeholder="ChildSurName"
            [(ngModel)]="form.childSurName">
    </div>

    <div class="col-sm-6">
        <label for="child-gender">Child Gender</label>
        <select class="form-control" id="childGender" name="child-gender" required>
        <option value="" selected disabled> Child's Gender</option>
            <option value="Male"> Male</option>
            <option value="Female"> Female </option>
        </select>
    </div>
    </div>

    <div class="form-group row">
        <div class="col-sm-12">
            <button 
                type="submit" 
                class="btn btn-lg btn-success btn-block" 
                [disabled]="!createForm.valid">Save Details </button>
        </div>
    </div>
</form>

Create.component.ts

import { Component, OnInit } from '@angular/core';
import { AuthService } from 'src/app/Services/auth.service';
import { Router } from '@angular/router';
import { AuthCheckService } from 'src/app/Services/auth-check.service';

@Component({
  selector: 'app-create',
  templateUrl: './create.component.html',
  styleUrls: ['./create.component.css']
})

export class CreateComponent implements OnInit {

  public form = {
    childSurName: null,
    child-gender: null
  };

  public error = null;

  constructor(
       private Auth:AuthService,
       private router: Router,
       private AuthCheck : AuthCheckService) 
  { }

   //Submit form data to the backend via a function in he service file
   onSubmit(){
    this.Auth.submitFormData(this.form).subscribe(
      data => console.log(data),
      error => console.log(error)
    );
  }

  ngOnInit() {
  }

}

Answer 1

您的select 元素上似乎缺少[(ngModel)] 指令。

Answer 2

将以下内容添加到<select>

[(ngModel)]="form.childGender"

为了保持一致性，将表单的键重命名为：

public form = {
   childSurName: null,
   childGender: null
};

这是一个同样有效的stackblitz。 （请注意，提交时仅将表单记录到控制台）