从父组件访问子组件

Question

我有一个标头组件和注册组件以及一个登录组件。 标头组件的选择器在登录组件和注册组件中都使用。 标题中有一个按钮。 如果用户在url ... / registration中，它将显示为登录按钮。 然后单击该按钮，路由将更改为登录

this.router.navigate(['/Login']);

当用户移至登录页面时，我想将该按钮更改为``注册''。 如何从登录组件和注册组件控制该按钮。

Answer 1

我已经使用@Input API完成了它。

Boot.ts

import {Component,bind} from 'angular2/core';
import {ROUTER_PROVIDERS,RouteConfig, ROUTER_DIRECTIVES,APP_BASE_HREF,LocationStrategy,RouteParams,ROUTER_BINDINGS} from 'angular2/router';
import {bootstrap}  from 'angular2/platform/browser';

import{ComponentOne} from 'src/cone';
import{ComponentTwo} from 'src/ctwo';

@Component({
  selector: 'my-app',
  template: `
    <h1>Component Router</h1>
    <nav>
    <hr>
      <a [routerLink]="['ComponentOne']">Login</a><hr/>
      <a [routerLink]="['ComponentTwo']">Registartion</a>
    </nav>
    <hr>
    <router-outlet></router-outlet>
  `,
  directives: [ROUTER_DIRECTIVES]
})
@RouteConfig([
  {path:'/component-one', name: 'ComponentOne', component: ComponentOne useAsDefault:true},
  {path:'/component-two', name: 'ComponentTwo', component: ComponentTwo}
])
export class AppComponent { }

    bootstrap(AppComponent, [
      ROUTER_PROVIDERS,bind(APP_BASE_HREF).toValue(location.pathname)
    ]);

Login.ts或锥体

 import {Component,View,ViewChild} from 'angular2/core';
 import {HeaderCmp} from 'src/header';


 @Component({
    template: `

    <header text="Registration"></header>
    <hr>
    <h1>Login</h1>
    `,
    directives:[HeaderCmp] 
  })

  export class ComponentOne {

      constructor(){ 
             console.log("first component being called");
      }

  }

Registartion.ts或ctwo.ts

import {Component,View} from 'angular2/core';
 import {HeaderCmp} from 'src/header';

 @Component({
    template: `
    <header text="Login"></header>
    <h1>Registration </h1>
    `,
    directives:[HeaderCmp]
  })

  export class ComponentTwo{
    constructor(){

      console.log("Second component being called");
    }
  }

Header.ts

import {Component,View,Input} from 'angular2/core';
 import {sharedService} from 'src/sharedService';

 @Component({
   selector:'header',
    template: `
    <h4>Header </h4>
    <button>{{text}}</button>
    `
  })

  export class HeaderCmp{
     @Input() text: string='myText';

      constructor(){
               console.log("Header being called");
      }

 }

工作演示