我试图复制这个:
http://plnkr.co/edit/OB2YTMJyeY3h9FOaztak?p=preview(这个plunker是有效的例子,我希望得到相同的结果,但我的代码,这是行不通的)
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@H_502_1@我有这个简单的双向绑定,我正在尝试更新父类和子节点上的字符串属性
@H_502_1@问题:当单击“从父级更新”时,两个绑定都会更新.但是当点击“从孩子更新”时,只有孩子更新!
@H_502_1@这看起来很简单,我可以做错什么?
@H_502_1@(注意:我使用了角度CLI来运行项目)
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@H_502_1@父组件:
import { Component,OnInit } from '@angular/core'; @Component({ selector: 'app-my-dad',templateUrl: './my-dad.component.html',styleUrls: ['./my-dad.component.css'] }) export class MyDadComponent { parentModel: string; constructor() {} updateModel(){ this.parentModel += ' parent'; } }@H_502_1@父模板
<h2>Parent: {{ parentModel }} </h2> <button (click)="updateModel()"> update from parent </button> <app-my-child [(model)]="parentModel"></app-my-child>@H_502_1@儿童组件
import { Component,OnInit,Input } from '@angular/core'; @Component({ selector: 'app-my-child',templateUrl: './my-child.component.html',styleUrls: ['./my-child.component.css'] }) export class MyChildComponent { @Input() model: string; constructor() { } updateModel(){ this.model += ' child'; } }@H_502_1@儿童模板:
<h2>Child: {{ model }} </h2> <button (click)="updateModel()"> update from child </button>
对于使用[(xxx)](banana-in-a-Box)语法的双向绑定,您需要和@Input()以及匹配名称的@Output()
> https://github.com/angular/angular/issues/11073#issuecomment-242563788
原文链接:https://www.f2er.com/angularjs/240438.html@Input() myProp:String; @Output() myPropChange:EventEmitter<String> = new EventEmitter<String>;@H_502_1@另见https://angular.io/docs/dart/latest/guide/template-syntax.html#!#two-way @H_502_1@要使用ngModel进行双向绑定,您的组件需要实现ControlValueAccessor @H_502_1@也可以看看 @H_502_1@> https://angular.io/docs/ts/latest/api/forms/index/NgModel-directive.html
> https://github.com/angular/angular/issues/11073#issuecomment-242563788