@query对继承的类不起作用 [英] @query is not working on inherited classes

问题描述

假设我有: ConcreteClass扩展了BaseClass {}

Suppose I have : ConcreteClass extends BaseClass{}

当尝试使用@Query(BaseClass)时， Angular什么也没找到. 只有当我查询ConcreteClass时，我才能得到结果； 有什么主意吗?

When trying to use @Query(BaseClass) , Angular don't find anything. Only when I am querying for ConcreteClass I get results; any idea?

推荐答案

不支持按@ViewChild(SubClass)中的子类查找.

Finding by subclass in @ViewChild(SubClass) is not supported.

请参见 https://github.com/angular/angular/issues/1828

https://github.com/angular/angular/issues/8580#issuecomment-218525425

@Component({
  selector: 'my-fancy-item',
  providers: [{provide: MyItem, useExisting: MyFancyItem}]
})
class MyFancyItem extends MyItem {}

查询MyItem的

查找MyItem和MyFancyItem.我还没有尝试过.

which makes a query for MyItem looks for MyItem and MyFancyItem. I haven't tried it though.

这篇关于@query对继承的类不起作用的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！