如何在angular 6的编辑页面上创建动态下拉式表单

import { Component, OnInit } from '@angular/core';
import { FormBuilder, FormGroup, FormControl, Validators } from '@angular/forms';

export class EditComponent implements OnInit {
  form: FormGroup;
  dropdownOptions: any[] = [
    { id: 1, name: 'Option 1' },
    { id: 2, name: 'Option 2' },
    { id: 3, name: 'Option 3' }
  ];

  constructor(private formBuilder: FormBuilder) { }

  ngOnInit() {
    this.form = this.formBuilder.group({
      dropdown: new FormControl('', Validators.required)
    });
  }
}

<form [formGroup]="form">
  <div class="form-group">
    <label for="dropdown">Dropdown:</label>
    <select formControlName="dropdown" class="form-control">
      <option *ngFor="let option of dropdownOptions" [value]="option.id">{{ option.name }}</option>
    </select>
  </div>
</form>

export class EditComponent implements OnInit {
  // ...

  onSubmit() {
    if (this.form.valid) {
      // 处理表单提交逻辑
    }
  }
}