小编nyk*_*yks的帖子

现在,我有一个初始页面,其中有三个链接.点击最后的"朋友"链接后,会启动相应的朋友组件.在那里,我想获取/获取我的朋友的列表进入friends.json文件.直到现在一切正常.但我仍然是使用RxJs的observables,map,subscribe concept的angular2的HTTP服务的新手.我试图理解它并阅读一些文章,但在我开始实际工作之前,我不会理解这些概念.

在这里,我已经制作了除HTTP相关工作之外的plnkr.

Plnkr

myfriends.ts

 import {Component,View,CORE_DIRECTIVES} from 'angular2/core';
 import {Http, Response,HTTP_PROVIDERS} from 'angular2/http';
 import 'rxjs/Rx';
 @Component({
    template: `
    <h1>My Friends</h1>
    <ul>
      <li *ngFor="#frnd of result">
          {{frnd.name}} is {{frnd.age}} years old.
      </li>
    </ul>
    `,
    directive:[CORE_DIRECTIVES]
  })

  export class FriendsList{

      result:Array<Object>; 
      constructor(http: Http) { 
        console.log("Friends are being called");

       // below code is new for me. So please show me correct way how to do it and please explain about .map and .subscribe functions and observable pattern.

        this.result = http.get('friends.json')
                      .map(response => …

开始学习angular2 beta组件路由.到目前为止我已经这样做了.

http://plnkr.co/edit/4YWWGhuBWd2CoWpC3GeY?p=preview

我复制了以下必需的CDN.请看看这里.

    <script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/2.0.0-beta.0/angular2-polyfills.js"></script>
    <script src="https://rawgithub.com/systemjs/systemjs/0.19.6/dist/system.js"></script>
    <script src="https://code.angularjs.org/tools/typescript.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/2.0.0-beta.0/Rx.js"></script>


    <script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/2.0.0-beta.0/angular2.dev.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/2.0.0-beta.0/router.dev.js"></script>

SRC/boot.ts

import {Component} from 'angular2/core';
import {ROUTER_PROVIDERS,RouteConfig, ROUTER_DIRECTIVES,LocationStrategy} 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>
      <a [routerLink]="['ComponentOne']">One</a><hr/>
      <a [routerLink]="['ComponentTwo']">Two</a>
    </nav>
    <router-outlet></router-outlet>
  `,
  directives: [ROUTER_DIRECTIVES]
})
@RouteConfig([
  {path:'/component-one', name: 'ComponentOne', component: ComponentOne},
  {path:'/component-two', name: 'ComponentTwo', component: ComponentTwo}
])
export class AppComponent { }

    bootstrap(AppComponent, [
      ROUTER_PROVIDERS
]);

SRC /锥

 import {Component,View} from …

我有一个模板,其中包含文本框,一个'span'标记和一个'div'标记.

'div'标签有'selectedColor'自定义指令.当输入值改变时,我想更改'span'和'div'标签的背景颜色.

所以最后我希望我的指令对输入变化做出反应并设置'div'标签的背景颜色.

我还想在输入值更改事件中更改"span"背景颜色.

Plunker

boot.ts

import {Component,bind} from 'angular2/core';

import {bootstrap} from 'angular2/platform/browser';
import {FORM_DIRECTIVES} from 'angular2/form';
import {selectedColorDirective} from 'src/directive';
import {Directive, ElementRef, Renderer, Input} from 'angular2/core';

@Component({
  selector: 'my-app',
  template: `
      <input type="text" [(ngModel)]="color"  />
      <br>
      <span > I'm {{color}} color <span>
      <div [mySelectedColor]="color"> I'm {{color}} color </div>
    `,
    directives: [selectedColorDirective]
})

export class AppComponent{

  color:string;
  constructor(el:ElementRef,renderer:Renderer)
  {
    this.color="Yellow";
    renderer.setElementStyle(el, 'backgroundColor', this.color);
  }
 }

    bootstrap(AppComponent, []);

directive.ts

import {Directive, ElementRef, Renderer, Input} from 'angular2/core';

@Directive({

  selector:"[mySelectedColor]", 
    host: …

在 Angular2 中，我正面临这个问题。当您刷新页面时。URL 保持不变，但它不会在RouterOutlet.

除了刷新页面问题外，一切正常。

应用程序

import {Component,bind} from 'angular2/core';

import {bootstrap} from 'angular2/platform/browser';
import {FORM_DIRECTIVES} from 'angular2/form';
import{HomeCmp} from 'Angular/src/Home/home.ts';
import {ContactUsCmp} from 'Angular/src/ContactUs/contactus.ts';

import {Router,ROUTER_PROVIDERS,RouteConfig, ROUTER_DIRECTIVES,APP_BASE_HREF,LocationStrategy,RouteParams,ROUTER_BINDINGS} from 'angular2/router';
@Component({
selector: 'micropuppy-app',
templateUrl: "ANGULAR/Templates/home.html",
directives:[HomeCmp,ROUTER_DIRECTIVES,ContactUsCmp],
template: ` <nav>
                    <ul class="nav navbar-nav">
                    **<li><a [routerLink]="['Home']">One</a><hr/></li>
                     <li><a [routerLink]="['ContactUs']">Contact Us</a></li>**
                    <li class="dropdown">
                        <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">Technologies <span class="caret"></span></a>
                        <ul class="dropdown-menu">
                            <li><a href="#">Angular</a></li>
                            <li><a href="#">.NET</a></li>
                        </ul>
                    </li>
            </ul>
        </nav>

    <router-outlet></router-outlet>`
 })

@RouteConfig([
  {path:'/Home', name: 'Home', component: HomeCmp}
  {path:'/ContactUs', name: …