Question

在我的项目中，我有两个组件

component1.ts

import { Component, OnInit } from '@angular/core';
import { MyserviceService } from '../myservice.service';

@Component({
selector: 'app-component1',
templateUrl: './component1.component.html',
styleUrls: ['./component1.component.css']
})
export class Component1Component implements OnInit {

constructor(private Service: MyserviceService) { }
 employee = [
 { id: '001', name: 'michael' },
 { id: '002', name: 'john' },
 { id: '003', name: 'james' },
 { id: '004', name: 'joe' },
 ];
 ngOnInit() {
 }

 onSelect(name) {
  alert(name);
  this.Service.setValue(name);
 }
 }

HTML

<div *ngFor="let emp of employee" (click)="onSelect(emp.name)">
Id: {{emp.id}} <br />
Name:  {{emp.name}}
</div>

此处onclick emp.name通过onselect（）

传递给服务

我需要将此值传递给第二个组件

component2.ts

import { Component, OnInit } from '@angular/core';


@Component({
selector: 'app-component2',
 templateUrl: './component2.component.html',
 styleUrls: ['./component2.component.css']
 })
 export class Component2Component implements OnInit {
 private selectedName: string;
 constructor() { }

  ngOnInit() {
  }
  }

HTML

<p>
selected name is: {{selectedName}}
</p>

服务代码是：

import { Injectable } from '@angular/core';

@Injectable()
export class MyserviceService {
 private myValue;
  constructor() { }
   setValue(val) {
    this.myValue = val;

  }

  getValue() {
    return this.myValue;
 }
 }

我需要在component2 html代码中将name显示为变量selectedName。

Answer 1

最好使用observable主动通知订阅者有关价值变化的信息：

@Injectable()
export class MyserviceService {
  private myValue = new BehaviorSubject<String>(null);
  public myValue$ = this.myValue.asObservable();
}

 export class Component2Component implements OnInit {
 private selectedName: string;
   constructor(service:MyserviceService) { 
     this.service.myValue$.subscribe(val => this.selectedName = val);
   }
 }

Answer 2

Angular文档讨论了如何使用@Input绑定 [https://angular.io/docs/ts/latest/cookbook/component-communication.html#!#parent-to-child][1]

在您的组件中1 html格式id和方括号内的名称以及替换div标签，其名称为组件2选择器标记

<app-component2 *ngFor="let emp of employee" (click)="onSelect(emp.name)"
  [hero]="hero"
  [master]="master">
</app-component2>

在组件2 .ts文件中添加导入和输入变量

import { Component, Input } from '@angular/core';


export class Component2Component {
  @Input() Id: string;
  @Input() Name: string;
}

在你的组件2 html中

<p>
selected name is: {{Name}}
</p>

将数据从一个组件传递到另一个组件并在视图中反映

2 个答案: