Angular2 - 导入组件时找不到模块

Question

我遇到了一个问题，而我打算在我的应用程序中使用的模块没有找到。我收到以下错误：

 GET http://product-admin.dev/node_modules/angular2-toaster/ 404 (Not Found)

模块是使用 NPM 安装的，模块 Github repo 在这里 (https://github.com/Stabzs/Angular2-Toaster)。

npm install angular2-toaster

应用程序似乎无法在 node_modules 文件夹中找到该文件，我不知道为什么。这是我的 Angular2 app.module.ts 文件的相关部分：

import { FileUploaderDirective } from "./components/directives/files/FileUploaderDirective";
import { TabsDirective } from "./components/directives/tabs/TabsDirective";
import { PaginationDirective } from "./components/directives/pagination/PaginationDirective";

import { APIUrlPipe } from "./pipes/apiurl.pipe";
import { ToasterModule } from "angular2-toaster";


@NgModule({
    imports: [
        BrowserModule,
        HttpModule,
        FormsModule,
        routing,
        ToasterModule,
        ReactiveFormsModule

我还可以看到，在 node_modules 文件夹中，模块位于名为“angular2-toaster”的文件夹中。我在想这可能是 SystemJS 配置问题，所以我在配置对象的 map 属性中添加了一行，如下所示：

/**
 * System configuration for Angular 2 samples
 * Adjust as necessary for your application needs.
 */
(function (global) {
    System.config({
        paths: {
            // paths serve as alias
            'npm:': 'node_modules/'
        },
        // map tells the System loader where to look for things
        map: {
            // our app is within the app folder
            app: 'app',
            // angular bundles
            '@angular/core': 'npm:@angular/core/bundles/core.umd.js',
            '@angular/common': 'npm:@angular/common/bundles/common.umd.js',
            '@angular/compiler': 'npm:@angular/compiler/bundles/compiler.umd.js',
            '@angular/platform-browser': 'npm:@angular/platform-browser/bundles/platform-browser.umd.js',
            '@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic/bundles/platform-browser-dynamic.umd.js',
            '@angular/http': 'npm:@angular/http/bundles/http.umd.js',
            '@angular/router': 'npm:@angular/router/bundles/router.umd.js',
            '@angular/forms': 'npm:@angular/forms/bundles/forms.umd.js',
            // other libraries
            'rxjs'                       : 'npm:rxjs',
            'angular2-toaster'           : 'npm:angular2-toaster',
            'angular2-in-memory-web-api' : 'npm:angular2-in-memory-web-api',
            "angular2-jwt"               : "npm:angular2-jwt/angular2-jwt.js"
        },

这似乎也没有任何区别。谁能明白为什么会出现这个问题？

谢谢

Answer 1

我设法让这个工作。我忘记在 Systemjs.config.js 文件的“包”属性中添加一个条目。这是该文件已修改并且现在可以使用。如果有人对包名称的差异感到困惑，我最终还使用了一个名为“ng2-toastr”的不同烤面包机包。

/**
 * System configuration for Angular 2 samples
 * Adjust as necessary for your application needs.
 */
(function (global) {
    System.config({
        paths: {
            // paths serve as alias
            'npm:': 'node_modules/'
        },
        // map tells the System loader where to look for things
        map: {
            // our app is within the app folder
            app: 'app',
            // angular bundles
            '@angular/core': 'npm:@angular/core/bundles/core.umd.js',
            '@angular/common': 'npm:@angular/common/bundles/common.umd.js',
            '@angular/compiler': 'npm:@angular/compiler/bundles/compiler.umd.js',
            '@angular/platform-browser': 'npm:@angular/platform-browser/bundles/platform-browser.umd.js',
            '@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic/bundles/platform-browser-dynamic.umd.js',
            '@angular/http': 'npm:@angular/http/bundles/http.umd.js',
            '@angular/router': 'npm:@angular/router/bundles/router.umd.js',
            '@angular/forms': 'npm:@angular/forms/bundles/forms.umd.js',
            // other libraries
            'rxjs'                       : 'npm:rxjs',
            'ng2-toastr'                 : 'npm:ng2-toastr',
            'angular2-in-memory-web-api' : 'npm:angular2-in-memory-web-api',
            "angular2-jwt"               : "npm:angular2-jwt/angular2-jwt.js"
        },
        // packages tells the System loader how to load when no filename and/or no extension
        packages: {
            app: {
                main: './main.js',
                defaultExtension: 'js'
            },
            rxjs: {
                defaultExtension: 'js'
            },
            'angular2-in-memory-web-api': {
                main: './index.js',
                defaultExtension: 'js'
            },
            'angular2-jwt': {
                'defaultExtension': 'js'
            },
            'npm:ng2-toastr': {
                main: './ng2-toastr.js',
                defaultExtension: 'js'
            }
        }
    });
})(this);