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Angular 2+和Observables:无法绑定到“ ngModel”

Angular 2+和Observables:无法绑定到“ ngModel”

慕雪6442864 2019-10-12 10:46:13
编辑:更新的Plunkr:http://plnkr.co/edit/fQ7P9KPjMxb5NAhccYIq?p = preview这部分工作:<div *ngFor="let entry of entries | async">  Label: {{ entry.label }}<br>  Value: {{ entry.value }}</div>但是选择框出现问题,错误消息是:无法绑定到“ ngModel”,因为它不是“ select”的已知属性整个组件://our root app componentimport {Component} from '@angular/core';import {NgFor} from '@angular/common';import {HTTP_PROVIDERS, Http} from '@angular/http';import 'rxjs/Rx';import {Observable} from 'rxjs/Rx';@Component({  selector: 'my-app',  providers: [HTTP_PROVIDERS],  template: `  <select [(ngModel)]="selectValue" name="selectValue">    <option *ngFor="let entry of entries | async"     [value]="entry.value">{{entry.label}}</option>  </select>    <div *ngFor="let entry of entries | async">      Label: {{ entry.label }}<br>      Value: {{ entry.value }}    </div>  `,  directives: [NgFor]})export class App {  entries: any = {};  selectValue:any;  constructor(private _http: Http) {    this.entries = this._http.get("./data.json")                            .map(res => res.json());  }}和data.json[  {    "timestamp": 0,    "label": "l1",    "value": 1  },  {    "timestamp": 0,    "label": "l2",    "value": 2  },  {    "timestamp": 0,    "label": "l3",    "value": 3      }]
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