Angular2 Http请求

沃纳·斯瓦特（Werner Swart）

嗨，我正在尝试使用中的HTTP模块发出get请求Angular2。

在Typescript（1.5）中一切都可以正常编译，但是Chrome在控制台中显示以下错误：

EXCEPTION: Error during instantiation of EntryList!. ORIGINAL
EXCEPTION: TypeError: Cannot read property 'merge' of undefined
ORIGINAL STACKTRACE: TypeError: Cannot read property 'merge' of undefined
at mergeOptions (angular2.dev.js:27991)  
at execute.Http.get (angular2.dev.js:28052)  
at EntryService.getEntries (services.js:17)
at new EntryList (entry-list.js:20)

服务

/// <reference path="../typings/angular2/angular2.d.ts" />
import { Http, Observable } from "angular2/angular2"

export class EntryService {
    private _entries: Array<string>;
    private _http : Http;

    constructor() {     
        this._entries = ["test1", "test2", "test3"];
        this._http = new Http;      
    }

    get Entries() : Array<string> {
        return this._entries;
    }

    getEntries()
    {
        console.log(this._http);
        return this._http.get('http://localhost:53338/api/decisions')       
            .toRx()
            .map((response) => { 
                response.json()
            });     
    }
}

entry-list.ts

/// <reference path="../typings/angular2/angular2.d.ts" />
/// <reference path="../modules/services.ts" />

import { Component, View, NgFor } from "angular2/angular2"
import { EntryService } from "modules/services"

@Component({
    selector: 'entry-list'  
})
@View({
    directives: [ NgFor ],
    templateUrl: "../views/entry-list.html" 
})
export class EntryList {
    entries: Array<string>; 

    constructor(public service: EntryService) {     
        this.entries = this.service.Entries;
        this.service.getEntries().subscribe((response) => {     
            console.log(response);
        }); 
    }
}

应用程序

/// <reference path="typings/angular2/angular2.d.ts" />
/// <reference path="components/entry-list.ts" />
/// <reference path="modules/services.ts" />

import { Component, View, bootstrap, NgFor } from "angular2/angular2"
import { EntryList } from "components/entry-list"
import { EntryService } from "modules/services"

@Component({
    selector : "app",
    bindings: [ EntryService ]  
})
@View({
    directives: [ EntryList ],
    templateUrl: "views/app.html"   
})
class App { 
    constructor() {
        console.log('hit');
    }
}

bootstrap(App);

index.html

<html>
    <head>
        <title>SCM</title>
        <script src="https://github.jspm.io/jmcriffey/[email protected]/traceur-runtime.js"></script>
        <script src="https://jspm.io/[email protected]"></script>      
        <script src="https://code.angularjs.org/2.0.0-alpha.34/angular2.dev.js"></script>
    </head>
    <body>
        <app></app>
        <script>System.import('app')</script>
    </body>
</html>

我确实查看了angular.io网站上的API文档，但看不到出了什么问题。

更新

服务

/// <reference path="../typings/angular2/angular2.d.ts" />
import { Http, Observable, httpInjectables } from "angular2/angular2"

export class EntryService {
    private _entries: Array<string>;    

    constructor(private http: Http) {       
        this._entries = ["test1", "test2", "test3"];            
    }

    get Entries() : Array<string> {
        return this._entries;
    }

    getEntries()
    {
        console.log(this.http);
        return this.http.get('http://localhost:53338/api/decisions')        
            .toRx()
            .map((response) => { 
                response.json()
            });     
    }
}

entry-list.ts

/// <reference path="../typings/angular2/angular2.d.ts" />
/// <reference path="../modules/services.ts" />

import { Component, View, NgFor, Http, httpInjectables } from "angular2/angular2"
import { EntryService } from "modules/services"

@Component({
    selector: 'entry-list',
    bindings : [ Http, httpInjectables ]
})
@View({
    directives: [ NgFor ],
    templateUrl: "../views/entry-list.html" 
})
export class EntryList {
    entries: Array<string>; 

    constructor(public service: EntryService) {     
        this.entries = this.service.Entries;
        this.service.getEntries().subscribe((response) => {     
            console.log(response);
        }); 
    }
}

应用程序

/// <reference path="typings/angular2/angular2.d.ts" />
/// <reference path="components/entry-list.ts" />
/// <reference path="modules/services.ts" />

import { Component, View, bootstrap, NgFor, Http, httpInjectables } from "angular2/angular2"
import { EntryList } from "components/entry-list"
import { EntryService } from "modules/services"

@Component({
    selector : "app",
    bindings: [ EntryService, Http, httpInjectables ]   
})
@View({
    directives: [ EntryList ],
    templateUrl: "views/app.html"   
})
class App { 
    constructor() {
        console.log('hit');
    }
}

bootstrap(App);

不作任何改变 index.html

编辑：我的services.ts文件更改为使此工作：

/// <reference path="../typings/angular2/angular2.d.ts" />
import { Injector, Http, httpInjectables } from "angular2/angular2"

export class EntryService {
    private _entries: Array<string>;    
    private http: Http;

    constructor() {     
        this._entries = ["test1", "test2", "test3"];        

        var injector = Injector.resolveAndCreate([
                httpInjectables,
                Http
            ]);
        this.http = injector.get(Http);                 
    }

    get Entries() : Array<string> {
        return this._entries;
    }

    getEntries()
    {       
        return this.http.get('http://localhost:53338/api/decisions')        
            .toRx()
            .map(response => response.json());      
    }
}

Arnaud Boeglin

您不应该自己实例化Http，而应该注入它：

public constructor(http : Http) {
    this.http = http;
}

该文件说：

Http作为可注入类提供，带有执行http请求的方法。

因此，我不确定如果您自己实例化结果是什么，但是由于某些内部未定义，因此由于某种原因它无法管理get请求。

编辑：添加更多源。

@Injectable()
export class Http {
    constructor(protected _backend: ConnectionBackend, protected _defaultOptions: RequestOptions) {}

    /**
     * Performs a request with `get` http method.
     */
    get(url: string, options?: RequestOptionsArgs): EventEmitter {
        return httpRequest(this._backend, new Request(mergeOptions(this._defaultOptions, options, RequestMethods.GET, url)));
  }
}

在这里，我从github存储库中添加了Http类的一小部分。您会看到_backend和_defaultOptions是在您不提供的构造函数中给出的，并且get（）方法将基于该构造函数中提供的options参数和_defaultOptions为请求构建选项。，我相信它会在您可以在此处找到的mergeOptions调用中崩溃：

function mergeOptions(defaultOpts, providedOpts, method, url): RequestOptions {
  var newOptions = defaultOpts;
  if (isPresent(providedOpts)) {
    // Hack so Dart can used named parameters
    newOptions = newOptions.merge(new RequestOptions({
      method: providedOpts.method,
      url: providedOpts.url,
      search: providedOpts.search,
      headers: providedOpts.headers,
      body: providedOpts.body,
      mode: providedOpts.mode,
      credentials: providedOpts.credentials,
      cache: providedOpts.cache
    }));
  }
  if (isPresent(method)) {
    return newOptions.merge(new RequestOptions({method: method, url: url}));
  } else {
    return newOptions.merge(new RequestOptions({url: url}));
  }
}