[英]Angular 2 *ngFor error: Can't bind to 'menuitemtype' since it isn't a known property of 'div'
[英]Angular: ternary operator in ngFor throw error Can't bind to 'ngFor' since it isn't a known property of 'div'
我的代碼中的div中有一個ngFor循環,如下所示:
<div formArrayName="i===0 ? 'viaOut' : 'viaIn' " fxLayout="row" fxLayoutGap="20px" *ngIf="viaOut">
<div *ngFor="i===0 ? 'let via of newRequest.controls.roundway.controls[i].controls.viaOut.controls; let j=index' : 'let via of newRequest.controls.roundway.controls[i].controls.viaIn.controls; let j=index' ">
在使用三元運算符之前,我只有一個簡單的ngFor和一個正常的formArrayName,它可以正常工作,但是當我更改為它時,它停止工作,並且在瀏覽器控制台中出現錯誤:
Uncaught Error: Template parse errors:
Can't bind to 'ngFor' since it isn't a known property of 'div'. ("me="i===0 ? 'viaOut' : 'viaIn' " fxLayout="row" fxLayoutGap="20px" *ngIf="viaOut">
<div [ERROR ->]*ngFor="i===0 ? 'let via of newRequest.controls.roundway.controls[i].controls.viaOut.controls; let j="): ng:///AppModule/NouvelledemandeComponent.html@132:17
Property binding ngFor not used by any directive on an embedded template. Make sure that the property name is spelled correctly and all directives are listed in the "@NgModule.declarations".
另外,我已經導入了BrowserModule(它在使用三元運算符之前可以正常工作)
謝謝
您無法將字符串或代碼分配給*ngFor
循環,盡管它看起來像是一個for循環,但實際上只需要一個NgIterable ,任何像數組一樣可迭代的東西,而不是代碼。 因此,您不能使用三元運算符。
例如,如果您將其輸入一個數組,它將起作用
let a of list
即使加上括號,它也會中斷
(let a of list)
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