FormControl在角度2中返回空值

import { Component } from '@angular/core';
import { FormControl } from '@angular/forms';

@Component({
  selector: 'app-example',
  templateUrl: './example.component.html',
  styleUrls: ['./example.component.css']
})
export class ExampleComponent {
  myControl = new FormControl(''); // 初始化 FormControl
}

<!-- example.component.html -->
<input [formControl]="myControl" />

import { Component, OnInit } from '@angular/core';
import { FormControl } from '@angular/forms';
import { DataService } from './data.service';

@Component({
  selector: 'app-example',
  templateUrl: './example.component.html',
  styleUrls: ['./example.component.css']
})
export class ExampleComponent implements OnInit {
  myControl = new FormControl('');

  constructor(private dataService: DataService) {}

  ngOnInit() {
    this.dataService.getData().subscribe(data => {
      this.myControl.setValue(data.value);
    });
  }
}

this.myControl.disable(); // 禁用控件
// 或者
this.myControl.markAsPending(); // 标记控件为 pending 状态

import { Component, ChangeDetectionStrategy } from '@angular/core';
import { FormControl } from '@angular/forms';

@Component({
  selector: 'app-example',
  templateUrl: './example.component.html',
  styleUrls: ['./example.component.css'],
  changeDetection: ChangeDetectionStrategy.OnPush // 使用 OnPush 策略
})
export class ExampleComponent {
  myControl = new FormControl('');

  updateValue(newValue: string) {
    this.myControl.setValue(newValue);
    // 如果需要手动触发变更检测，可以使用 ChangeDetectorRef
    // this.changeDetectorRef.detectChanges();
  }
}