Question

如何检查儿童路由器是否有效，显示角度4中的状态为true或false，
现在我正在使用： / * @ angular / cli：1.4.4 节点：8.6.0 打字稿：2.3.4 @ angular / router：4.4.4 * /

我的父路线是：

const routes:Routes=[
    {
        path: '', component: SummaryOfFindingsComponent,
        children:[
            {
                path:'data-time-frame', component: DataTimeFrameComponent
            },
            {
                path:'email-address', component: EmailAddressesComponent
            },
            {
                path:'repair-orders', component: RepairOrdersComponent
            },
            {
                path:'total-records', component:TotalRecordsComponent
            },
            {
                path:'unique-households', component: UniqueHouseholdsComponent
            },
            {
                path:'unique-vins', component: UniqueVinsComponent
            }
        ]
    }
]

父组件是：

export class SummaryOfFindingsComponent implements OnInit {
    isUserSelected;
    constructor() { this.isUserSelected=false; }
    ngOnInit() { }
    isUserItemSelect(){
        this.isUserSelected=true;
    }
}

Answer 1

导入您的父组件.ts

import { ActivatedRoute } from '@angular/router';

和生命周期挂钩ngOnInit（）并创建ActivatedRoute的Refarence

constructor(private activeRouter:ActivatedRoute) {}

并在此处写入ngOnInit函数中的一些代码..

ngOnInit() {
    var _activeChild = this.activeRouter.children.length;
    if (_activeChild!=0) {
        //your active children 1 or more than children then active 1,otherwise it is 0
    }
}

注意：此代码正在运行我的应用程序（谢谢）

Answer 2

这是一种观察Observable中儿童的方法......

this.router.events.pipe(
  filter(event => event instanceof ActivationEnd),
  filter(event => (event as ActivationEnd).snapshot.component === SearchFeatureComponent),
  map(event => (event as ActivationEnd).snapshot.children.length),
  distinctUntilChanged()
).subscribe(children => console.warn('route children', children))

如何从父路由器或父路由器检查活动子路由器？

2 个答案: