javascript - Angular 2 Release "Unexpected value ' ElementRef' 由模块导入”

Question

我升级到了 Angular 2 版本，并且正在尝试使用 ElementRef。首先，我收到错误 Angular2 RC5 error:zone.js: Unhandled Promise Rejection: No provider for ElementRef ，如下所示:Angular2 RC5 error:zone.js: Unhandled Promise rejection: No provider for ElementRef所以我将代码更改为:

import { NgModule, CUSTOM_ELEMENTS_SCHEMA, ElementRef }       from '@angular/core';
@NgModule({
    declarations: [DashboardComponent, WidgetBankComponent, DataTableDirectives, OrderBy],
    exports: [DashboardComponent, WidgetBankComponent],
    imports: [BrowserModule, HttpModule, FormsModule, ChartsModule, ElementRef],
    providers: [ChartService, GridService, WidgetsControlService, GridViewService, ApplicationSettingsService, DataService, ToolsService, LocalStorageService, RuntimeCompiler, COMPILER_PROVIDERS, NgGrid, NgGridItem],
    schemas: [CUSTOM_ELEMENTS_SCHEMA]
})

现在我收到错误(SystemJS)模块“DashboardModule”导入的意外值“ElementRef”

有什么想法吗？

提前谢谢您!

编辑

下面的答案中建议的修复是否已完成，现在出现了此错误 - 这是完整的错误 - 有没有办法告诉我需要从该错误中向提供者提供何处？

zone.js:355 Unhandled Promise rejection: No provider for ElementRef! ; Zone: <root> ; Task: Promise.then ; Value: NoProviderError {_nativeError: Error: No provider for ElementRef!
    at NoProviderError.Error (native)
    at NoProviderError.Base…, keys: Array[1], injectors: Array[1]}_nativeError: Error: No provider for ElementRef!
    at NoProviderError.Error (native)
    at NoProviderError.BaseError [as constructor] (http://localhost:56159/node_modules/@angular/core//bundles/core.umd.js:1248:38)
    at NoProviderError.AbstractProviderError [as constructor] (http://localhost:56159/node_modules/@angular/core//bundles/core.umd.js:1703:20)
    at new NoProviderError (http://localhost:56159/node_modules/@angular/core//bundles/core.umd.js:1734:20)
    at ReflectiveInjector_._throwOrNull (http://localhost:56159/node_modules/@angular/core//bundles/core.umd.js:3331:23)
    at ReflectiveInjector_._getByKeyDefault (http://localhost:56159/node_modules/@angular/core//bundles/core.umd.js:3359:29)
    at ReflectiveInjector_._getByKey (http://localhost:56159/node_modules/@angular/core//bundles/core.umd.js:3322:29)
    at ReflectiveInjector_.get (http://localhost:56159/node_modules/@angular/core//bundles/core.umd.js:3131:25)
    at NgModuleInjector.AppModuleInjector.createInternal (AppModule.ngfactory.js:310:75)
    at NgModuleInjector.create (http://localhost:56159/node_modules/@angular/core//bundles/core.umd.js:7192:80)constructResolvingMessage: (keys)injectors: Array[1]keys: Array[1]message: (...)name: (...)stack: (...)__proto__: AbstractProviderError Error: No provider for ElementRef!
    at NoProviderError.Error (native)
    at NoProviderError.BaseError [as constructor] (http://localhost:56159/node_modules/@angular/core//bundles/core.umd.js:1248:38)
    at NoProviderError.AbstractProviderError [as constructor] (http://localhost:56159/node_modules/@angular/core//bundles/core.umd.js:1703:20)
    at new NoProviderError (http://localhost:56159/node_modules/@angular/core//bundles/core.umd.js:1734:20)
    at ReflectiveInjector_._throwOrNull (http://localhost:56159/node_modules/@angular/core//bundles/core.umd.js:3331:23)
    at ReflectiveInjector_._getByKeyDefault (http://localhost:56159/node_modules/@angular/core//bundles/core.umd.js:3359:29)
    at ReflectiveInjector_._getByKey (http://localhost:56159/node_modules/@angular/core//bundles/core.umd.js:3322:29)
    at ReflectiveInjector_.get (http://localhost:56159/node_modules/@angular/core//bundles/core.umd.js:3131:25)
    at NgModuleInjector.AppModuleInjector.createInternal (AppModule.ngfactory.js:310:75)
    at NgModuleInjector.create (http://localhost:56159/node_modules/@angular/core//bundles/core.umd.js:7192:80)consoleError @ zone.js:355_loop_1 @ zone.js:382drainMicroTaskQueue @ zone.js:386ZoneTask.invoke @ zone.js:308
zone.js:357 Error: Uncaught (in promise): Error: No provider for ElementRef!(…)consoleError @ zone.js:357_loop_1 @ zone.js:382drainMicroTaskQueue @ zone.js:386ZoneTask.invoke @ zone.js:308

Answer 1

尝试从 imports 数组中删除 ElementRef 并将其粘贴到 providers 数组中:

import { NgModule, CUSTOM_ELEMENTS_SCHEMA, ElementRef } from '@angular/core';
@NgModule({
    declarations: [DashboardComponent, WidgetBankComponent, DataTableDirectives, OrderBy],
    exports: [DashboardComponent, WidgetBankComponent],
    imports: [BrowserModule, HttpModule, FormsModule, ChartsModule],
    providers: [ChartService, GridService, WidgetsControlService, GridViewService, ApplicationSettingsService, DataService, ToolsService, LocalStorageService, RuntimeCompiler, COMPILER_PROVIDERS, NgGrid, NgGridItem, ElementRef],
    schemas: [CUSTOM_ELEMENTS_SCHEMA]
})