javascript - Angular2 - 未捕获尝试使用已销毁的 View : detectChanges

Question

所以我的应用程序一直给我这个错误:

extensions::uncaught_exception_handler:8 Error in event handler for runtime.onMessage: Attempt to use a destroyed view: detectChanges
at ViewDestroyedException.BaseException [as constructor] (chrome-extension://npblbblmbmcjbldhcneoocaobkkicbno/node_modules/@angular/core/core.umd.js:3776:27)
at new ViewDestroyedException (chrome-extension://npblbblmbmcjbldhcneoocaobkkicbno/node_modules/@angular/core/core.umd.js:6957:20)
at DebugAppView.AppView.throwDestroyedError (chrome-extension://npblbblmbmcjbldhcneoocaobkkicbno/node_modules/@angular/core/core.umd.js:10041:76)
at DebugAppView.AppView.detectChanges (chrome-extension://npblbblmbmcjbldhcneoocaobkkicbno/node_modules/@angular/core/core.umd.js:9994:22)
at DebugAppView.detectChanges (chrome-extension://npblbblmbmcjbldhcneoocaobkkicbno/node_modules/@angular/core/core.umd.js:10084:48)
at ViewRef_.detectChanges (chrome-extension://npblbblmbmcjbldhcneoocaobkkicbno/node_modules/@angular/core/core.umd.js:9397:69)
at SafeSubscriber.eval [as _next] (chrome-extension://npblbblmbmcjbldhcneoocaobkkicbno/scripts/components/product-card.component.js:63:54)
at SafeSubscriber.__tryOrUnsub (chrome-extension://npblbblmbmcjbldhcneoocaobkkicbno/node_modules/rxjs/Subject/../bundles/Rx.umd.js:1408:16)
at SafeSubscriber.next (chrome-extension://npblbblmbmcjbldhcneoocaobkkicbno/node_modules/rxjs/Subject/../bundles/Rx.umd.js:1357:22)
at Subscriber._next (chrome-extension://npblbblmbmcjbldhcneoocaobkkicbno/node_modules/rxjs/Subject/../bundles/Rx.umd.js:1307:26)
at Subscriber.next (chrome-extension://npblbblmbmcjbldhcneoocaobkkicbno/node_modules/rxjs/Subject/../bundles/Rx.umd.js:1271:18)
at Subject._finalNext (chrome-extension://npblbblmbmcjbldhcneoocaobkkicbno/node_modules/rxjs/Subject/../bundles/Rx.umd.js:1063:30)
at Subject._next (chrome-extension://npblbblmbmcjbldhcneoocaobkkicbno/node_modules/rxjs/Subject/../bundles/Rx.umd.js:1055:18)
at Subject.next (chrome-extension://npblbblmbmcjbldhcneoocaobkkicbno/node_modules/rxjs/Subject/../bundles/Rx.umd.js:1012:14)handler @ extensions::uncaught_exception_handler:8(anonymous function) @ extensions::uncaught_exception_handler:100EventImpl.dispatch_ @ extensions::event_bindings:376EventImpl.dispatch @ extensions::event_bindings:393target.(anonymous function) @ extensions::SafeBuiltins:19publicClass.(anonymous function) @ extensions::utils:94messageListener @ extensions::messaging:189target.(anonymous function) @ extensions::SafeBuiltins:19EventImpl.dispatchToListener @ extensions::event_bindings:387target.(anonymous function) @ extensions::SafeBuiltins:19publicClass.(anonymous function) @ extensions::utils:94EventImpl.dispatch_ @ extensions::event_bindings:371EventImpl.dispatch @ extensions::event_bindings:393target.(anonymous function) @ extensions::SafeBuiltins:19publicClass.(anonymous function) @ extensions::utils:94dispatchOnMessage @ extensions::messaging:320

在组件的 ChangeDetectorReference 上调用 detectChanges 时:this._changeDetectorRef.detectChanges();

我遇到了类似的堆栈问题:

What is a dehydrated detector and how am I using one here?

和一些github问题:

https://github.com/angular/angular/issues/6786 https://github.com/angular/angular/issues/6786#issuecomment-185429140

这导致我这样调用 detectChanges:

setTimeout( () => this._changeDetectorRef.detectChanges(), 10);

将错误更改为:

zone.js:260 Uncaught Attempt to use a destroyed view: detectChanges
Zone.runTask @ zone.js:260
ZoneTask.invoke @ zone.js:423

但它仍在发生。它没有破坏我的应用程序(在使用 setTimeout 之前)，但我想弄清楚如何摆脱它。

我调用 detectChanges() 是因为后台发生的事情改变了应用程序的状态(不是用户输入的结果)。调用 detectChanges() 时，组件不是新创建的或将被销毁。组件的样式会因后台发生的事情而发生变化。

Answer 1

在你的类的构造函数中给出:

setTimeout( () => this._changeDetectorRef.markForCheck(), 10);

在@component中:

changeDetection: ChangeDetectionStrategy.OnPush,