无法在 Angular 4 中读取 null 的属性“出口" [英] Cannot read property 'outlets' of null in Angular 4
问题描述
我有 Angular 4.3.6 项目,其中模板片段会产生此错误.
I have Angular 4.3.6 project where a template snippet produces this error.
模板块:
<a [routerLink]="['/article',article?.id]">{{article?.title}}</a>
错误堆栈跟踪:
ArticleSpComponent.html:26 ERROR TypeError: Cannot read property 'outlets' of null
at createNewSegmentGroup (router.es5.js:2967)
at updateSegmentGroup (router.es5.js:2896)
at router.es5.js:2914
at forEach (router.es5.js:593)
at updateSegmentGroupChildren (
错误原因似乎很明显.article 变量从 Http 异步获取并在页面呈现后初始化,因此首先它为空.但是我认为把?在这个变量之后可以避免这个问题.
The error cause seems to be obvious. article variable is fetched async from Http and initialized after page is rendered so firstly it's null. However I thought that putting ? after this variable allows to avoid this issue.
你能指点一下吗?
推荐答案
?
在 article?.id
工作正常,但 RouterLink
指令不喜欢获得 null代码>通过.
?
in article?.id
is working fine, but the RouterLink
directive doesn't like getting a null
passed.
您可以使用以下方法解决:
You could work around using something like:
<a *ngIf="article" [routerLink]="['/article',article?.id]">{{article?.title}}</a>
<a *ngIf="!article">{{article?.title}}</a>
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