javascript - ngFor 中的 Angular2 组件抛出错误(viewFactory 不是函数)

Question

我在 Angular 2 应用程序(测试版 1)中有一个 ComponentB。在我将它放在 ComponentA 的 ngFor 循环中之前，它工作得很好。我收到了一个相当神秘的错误:

EXCEPTION: TypeError: viewFactory_ComponentB0 is not a function in [numbers in ComponentA@1:23]BrowserDomAdapter.logError @ angular2.dev.js:22690BrowserDomAdapter.logGroup @ angular2.dev.js:22701ExceptionHandler.call @ angular2.dev.js:1163(anonymous function) @ angular2.dev.js:12416NgZone._notifyOnError @ angular2.dev.js:13324collection_1.StringMapWrapper.merge.onError @ angular2.dev.js:13228run @ angular2-polyfills.js:141(anonymous function) @ angular2.dev.js:13247NgZone.run @ angular2.dev.js:13209(anonymous function) @ angular2.dev.js:12499schedulerFn @ angular2.dev.js:12742tryCatcher @ Rx.js:31Subscriber.next @ Rx.js:9500Subject._next @ Rx.js:9999Subject.next @ Rx.js:9963EventEmitter.emit @ angular2.dev.js:12723(anonymous function) @ angular2.dev.js:13140run @ angular2-polyfills.js:138NgZone._notifyOnTurnDone @ angular2.dev.js:13139(anonymous function) @ angular2.dev.js:13254zoneBoundFn @ angular2-polyfills.js:111lib$es6$promise$asap$$flush @ angular2-polyfills.js:1305 angular2.dev.js:22690 ORIGINAL EXCEPTION: TypeError: viewFactory_ComponentB0 is not a functionBrowserDomAdapter.logError @ angular2.dev.js:22690ExceptionHandler.call @ angular2.dev.js:1172(anonymous function) @ angular2.dev.js:12416NgZone._notifyOnError @ angular2.dev.js:13324collection_1.StringMapWrapper.merge.onError @ angular2.dev.js:13228run @ angular2-polyfills.js:141(anonymous function) @ angular2.dev.js:13247NgZone.run @ angular2.dev.js:13209(anonymous function) @ angular2.dev.js:12499schedulerFn @ angular2.dev.js:12742tryCatcher @ Rx.js:31Subscriber.next @ Rx.js:9500Subject._next @ Rx.js:9999Subject.next @ Rx.js:9963EventEmitter.emit @ angular2.dev.js:12723(anonymous function) @ angular2.dev.js:13140run @ angular2-polyfills.js:138NgZone._notifyOnTurnDone @ angular2.dev.js:13139(anonymous function) @ angular2.dev.js:13254zoneBoundFn @ angular2-polyfills.js:111lib$es6$promise$asap$$flush @ angular2-polyfills.js:1305 angular2.dev.js:22690 ORIGINAL STACKTRACE:BrowserDomAdapter.logError @ angular2.dev.js:22690ExceptionHandler.call @ angular2.dev.js:1175(anonymous function) @ angular2.dev.js:12416NgZone._notifyOnError @ angular2.dev.js:13324collection_1.StringMapWrapper.merge.onError @ angular2.dev.js:13228run @ angular2-polyfills.js:141(anonymous function) @ angular2.dev.js:13247NgZone.run @ angular2.dev.js:13209(anonymous function) @ angular2.dev.js:12499schedulerFn @ angular2.dev.js:12742tryCatcher @ Rx.js:31Subscriber.next @ Rx.js:9500Subject._next @ Rx.js:9999Subject.next @ Rx.js:9963EventEmitter.emit @ angular2.dev.js:12723(anonymous function) @ angular2.dev.js:13140run @ angular2-polyfills.js:138NgZone._notifyOnTurnDone @ angular2.dev.js:13139(anonymous function) @ angular2.dev.js:13254zoneBoundFn @ angular2-polyfills.js:111lib$es6$promise$asap$$flush @ angular2-polyfills.js:1305 angular2.dev.js:22690 TypeError: viewFactory_ComponentB0 is not a function at AppElement.viewFactory_ComponentA1 [as embeddedViewFactory] (viewFactory_ComponentA:388) at AppViewManager_.createEmbeddedViewInContainer (angular2.dev.js:9185) at ViewContainerRef_.createEmbeddedView (angular2.dev.js:5890) at NgFor._bulkInsert (angular2.dev.js:14608) at NgFor._applyChanges (angular2.dev.js:14567) at NgFor.ngDoCheck (angular2.dev.js:14552) at AbstractChangeDetector.ChangeDetector_ComponentA_0.detectChangesInRecordsInternal (viewFactory_ComponentA:45) at AbstractChangeDetector.detectChangesInRecords (angular2.dev.js:7825) at AbstractChangeDetector.runDetectChanges (angular2.dev.js:7808) at AbstractChangeDetector._detectChangesInViewChildren (angular2.dev.js:7892)

组件A:

@Component({
  selector: 'component-a'
  , directives: [
    FORM_DIRECTIVES
    , ComponentB
  ]
  , template: `
    <!-- works --><component-b [(ngFormControl)]="_formControl"></component-b>
    <!-- fails --><component-b *ngFor="#number of numbers" [(ngFormControl)]="_formControls[number]"></component-b>
  `
})

export class ComponentA {}

非常感谢任何提示/帮助。

Answer 1

根据@TylerDurden 的建议

此错误消息是由循环检测中引入的错误产生的(请参阅 #6404)。

master 中已经有一个修复程序(参见 #6474)尚未发布。这肯定会出现在 beta.2 中。

建议降级到 beta.0，直到 Storm 结束。

更新

此问题已在 beta.2 中修复(缩小问题仍然存在)。参见 changelog了解更多详情。