Angular NgUpgrade将AngularJS服务注入Angular服务;获取:未处理
我在这里看到了很多类似的问题,但还没有找到一个有效的解决方案.我认为正在发生的是,因为我们的Ng2App首先被引导,它还没有引用$injector,所以当我尝试在我的提供者声明(deps:[‘$injector’])中使用它时,它没有’存在.
什么是INSANELY奇怪的是我可以在Angular COMPONENT中使用此服务但由于某种原因无法在Angular SERVICE中使用它. app.js import UserService from './user.service'; angular.module('app',[]) .service('UserService',UserService) .config(/* config */) .run(/* run */); import './ng2app.module'; ng2app.module.ts: import { BrowserModule } from '@angular/platform-browser'; import { UpgradeModule } from '@angular/upgrade/static'; import { platformBrowserDynamic } from '@angular/platform-browser-dynamic'; @NgModule({ imports: [ BrowserModule,UpgradeModule,],declarations: [],entryComponents: [],providers: [ // angularJS service: { provide: 'UserService',useFactory: (i: any) => i.get('UserService'),// <---- this is the line all the errors point to. deps: ['$injector'] },] }) export default class Ng2AppModule { constructor(){} } platformBrowserDynamic() .bootstrapModule(Ng2AppModule) .then(platformRef => { const upgrade = platformRef.injector.get(UpgradeModule) as UpgradeModule; upgrade.bootstrap(document.documentElement,['app'],{strictDi: true}); }); 后来…在服务中(失败): import {Injectable,Inject} from "@angular/core"; import UserService from 'app/login/user.service'; @Injectable() export class AnAngularService{ constructor( // causes the error if I uncomment it wtf: <-------------- // @Inject('UserService') private userService: UserService ){} } 稍后……在一个组件中(正常工作): import { Component } from '@angular/core'; import {Inject} from "@angular/core"; import UserService from 'app/login/user.service'; import template from 'tmpl.html'; @Component({ selector: 'an-angular-component',template,}) export class AnAngularComponent{ constructor( @Inject('UserService') private userService: UserService ){ console.log(userService) // works just fine. wtf <-------------- } } 有谁知道为什么会这样,以及如何解决它? This question is almost exactly the same thing but for some reason it didnt work AngularJS版本:1.5.8 Here’s a link to the Github issue I opened in the Angular repo 堆栈跟踪: zone.js:522 Unhandled Promise rejection: Cannot read property 'get' of undefined ; Zone: <root> ; Task: Promise.then ; Value: TypeError: Cannot read property 'get' of undefined at useFactory (ng2app.module.ts:114) at _callFactory (core.es5.js:9604) at _createProviderInstance$1 (core.es5.js:9547) at initNgModule (core.es5.js:9498) at new NgModuleRef_ (core.es5.js:10606) at createNgModuleRef (core.es5.js:10590) at Object.debugCreateNgModuleRef [as createNgModuleRef] (core.es5.js:12874) at NgModuleFactory_.create (core.es5.js:13869) at core.es5.js:4556 at ZoneDelegate.invoke (zone.js:334) at Object.onInvoke (core.es5.js:3933) at ZoneDelegate.invoke (zone.js:333) at Zone.run (zone.js:126) at NgZone.run (core.es5.js:3801) at PlatformRef_._bootstrapModuleFactoryWithZone (core.es5.js:4554) at core.es5.js:4596 at ZoneDelegate.invoke (zone.js:334) at Zone.run (zone.js:126) at zone.js:713 at ZoneDelegate.invokeTask (zone.js:367) at Zone.runTask (zone.js:166) at drainMicroTaskQueue (zone.js:546) at <anonymous> TypeError: Cannot read property 'get' of undefined at useFactory (http://localhost:9000/app.bundle.js:4404:52) at _callFactory (http://localhost:9000/vendor.bundle.js:10600:26) at _createProviderInstance$1 (http://localhost:9000/vendor.bundle.js:10543:26) at initNgModule (http://localhost:9000/vendor.bundle.js:10494:13) at new NgModuleRef_ (http://localhost:9000/vendor.bundle.js:11602:9) at createNgModuleRef (http://localhost:9000/vendor.bundle.js:11586:12) at Object.debugCreateNgModuleRef [as createNgModuleRef] (http://localhost:9000/vendor.bundle.js:13870:12) at NgModuleFactory_.create (http://localhost:9000/vendor.bundle.js:14865:25) at http://localhost:9000/vendor.bundle.js:5552:61 at ZoneDelegate.invoke (http://localhost:9000/vendor.bundle.js:289131:26) at Object.onInvoke (http://localhost:9000/vendor.bundle.js:4929:37) at ZoneDelegate.invoke (http://localhost:9000/vendor.bundle.js:289130:32) at Zone.run (http://localhost:9000/vendor.bundle.js:288923:43) at NgZone.run (http://localhost:9000/vendor.bundle.js:4797:62) at PlatformRef_._bootstrapModuleFactoryWithZone (http://localhost:9000/vendor.bundle.js:5550:23) at http://localhost:9000/vendor.bundle.js:5592:59 at ZoneDelegate.invoke (http://localhost:9000/vendor.bundle.js:289131:26) at Zone.run (http://localhost:9000/vendor.bundle.js:288923:43) at http://localhost:9000/vendor.bundle.js:289510:57 at ZoneDelegate.invokeTask (http://localhost:9000/vendor.bundle.js:289164:31) at Zone.runTask (http://localhost:9000/vendor.bundle.js:288963:47) at drainMicroTaskQueue (http://localhost:9000/vendor.bundle.js:289343:35) at <anonymous> consoleError @ zone.js:522 handleUnhandledRejection @ zone.js:527 _loop_1 @ zone.js:562 drainMicroTaskQueue @ zone.js:566 Promise resolved (async) scheduleQueueDrain @ zone.js:505 scheduleMicroTask @ zone.js:513 ZoneDelegate.scheduleTask @ zone.js:356 Zone.scheduleTask @ zone.js:196 Zone.scheduleMicroTask @ zone.js:207 scheduleResolveOrReject @ zone.js:711 ZoneAwarePromise.then @ zone.js:800 PlatformRef_._bootstrapModuleWithZone @ core.es5.js:4596 PlatformRef_.bootstrapModule @ core.es5.js:4581 (anonymous) @ ng2app.module.ts:140 __webpack_require__ @ bootstrap 2f644bad14cb0bb324ab:691 fn @ bootstrap 2f644bad14cb0bb324ab:110 (anonymous) @ app.js:116 __webpack_require__ @ bootstrap 2f644bad14cb0bb324ab:691 fn @ bootstrap 2f644bad14cb0bb324ab:110 (anonymous) @ util (ignored):1 __webpack_require__ @ bootstrap 2f644bad14cb0bb324ab:691 webpackJsonpCallback @ bootstrap 2f644bad14cb0bb324ab:23 (anonymous) @ app.bundle.js:1 解决方法
这似乎是调整@NgModule({providers:[]})和upgrade.bootstrap解决方案的问题.
在这里你需要$injector,但它在被请求时没有被注入. 在docs中它说你应该使用ngDoBootstrap钩子. export function userServiceFactory(i: any) { return i.get('UserService'); } export const userServiceProvider = { provide: 'UserService',useFactory: userServiceFactory,deps: ['$injector'] }; import { BrowserModule } from '@angular/platform-browser'; import { UpgradeModule } from '@angular/upgrade/static'; import { platformBrowserDynamic } from '@angular/platform-browser-dynamic'; @NgModule({ imports: [ BrowserModule,providers: [ userServiceProvider ] }) export default class Ng2AppModule { constructor(private upgrade: UpgradeModule) { } ngDoBootstrap() { this.upgrade.bootstrap(document.body,{ strictDi: true }); } } platformBrowserDynamic().bootstrapModule(Ng2AppModule); 由安德鲁·卢林编辑为后代 import { forwardRef } from '@angular/core'; useFactory: (forwardRef(() => '$injector')i: any) => i.get('UserService') 而这似乎比这更接近答案.这也不起作用 – 但这似乎是因为TypeScript不认为语法是正确的. 更新: 我们对useFactory如此着迷,以至于我们没有看到修复只是将forwardRef添加到服务中. @Injectable() export class AnAngularService{ constructor(@Inject(forwardRef(() => 'UserService')) private userService: UserService ){} } (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |