// service.ts import { Injectable, Inject } from '@angular/core'; import { Http } from '@angular/http'; import { Observable } from 'rxjs/Observable'; import 'rxjs/add/operator/map'; @Injectable() export class FoodService { constructor( private http:…

Angular 2 已经正式 Release 了,Thoughtram 已经发布了一系列的文档,对 Angular 2 的各个方面进行深入的阐释和说明. 我计划逐渐将这个系列翻译出来,以便对大家学习 Angular 2 提供一些方便. Getting Started Building a Zippy component in Angular 2 Developing a Tabs component in Angular 2 Angular 2 Template Syntax demystifi…

Dependecies aren’t always objects created by classes or factory functions. Sometimes, all we really want is inject a simple value, which can be a primitive, or maybe just a configuration object. For these cases, we can use value providers and in this…

In this lesson, we’re going to take a look at how add a class to the providers property of a component creates an actual providers. We’ll learn what a provider specifically does and how we can provide different dependencies with the same token. impor…

官方文档Providers Each web application you build is composed of objects that collaborate to get stuff done.(每一个web应用都是由一些对象“组装”成的,这些对象共同合作,来完成特定的任务)These objects need to be instantiated and wired together for the app to work.(这些对象需要被实例化,然后“组装”在一起来使web应用能…

转自:https://segmentfault.com/a/1190000010700308 有时,你需要在 Angular 应用中创建一个共享模块,该模块定义了功能模块和lazy-loaded模块可以使用的服务,管道与指令.一个小问题就是服务,通常应该作为单例的服务可能会被多次提供.幸运的是,对于我们来说,通过在共享模块中定义一个返回ModuleWithProviders对象的静态方法forRoot,就可以轻松解决这个问题. 这是一个示例的实现,首先是我们定义的共享模块 //: ./share…

Artical --> BYPASSING PROVIDERS IN ANGULAR 2 Here trying to solve one problem: On the left hand side of tree, there are 4 green blocks and 1 blue block. Meaning that three green dataService will use 'OtherProvider' which in an instance of DataService…

In this example, we are going to see how to use Pipe as providers inject into component. We have the pipe: import {Pipe, PipeTransform} from '@angular/core'; @Pipe({ name: 'filesize' }) export class FileSizePipe implements PipeTransform{ transform(va…

在Angular中使用依赖注入(DI)的时候,我们一般会使用providers.其实要做同样的事我们还有另外一个选择:viewProviders. viewProviders允许我们定义只对组件的view可见的provider.下面我们用例子详细的说明这一点. 假设我们有一个简单的服务: // myService.service.ts import { Injectable } from '@angular/core'; @Injectable() export class MyService{…

For example we have a component: class TodoList { private todos: Todo[] = []; add(todo: Todo) {} remove(todo: Todo) {} set(todo: Todo, index: number) {} get(index: number) {} getAll() {} } @Component({ // ... viewProviders: [TodoList] // ... }) class…