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我有一个服务可以获取路由列表,这些路由用于使用下面的代码构建Bootstrap 4下拉菜单。角度4 - 路由值不可访问
我面临的挑战是我无法弄清楚如何捕捉路线值并将其插入到“家”和“细节”的链接中。任何帮助将不胜感激!
import { Component, Injectable, OnInit, Pipe, PipeTransform } from '@angular/core';
import { Http, URLSearchParams } from '@angular/http';
import { Router, ActivatedRoute, Params } from '@angular/router';
import { Observable } from 'rxjs/Observable';
import { sitesService } from '../services/sites.service';
@Component({
selector: 'app-header',
templateUrl: './header.component.html',
styleUrls: ['./header.component.css']
})
export class HeaderComponent implements OnInit {
sites: any;
filteredsiteTitle = '';
selectedsite: { name: string };
// selectedsite: any;
constructor(private sitesService: sitesService, private router: Router, private route: ActivatedRoute) { }
ngOnInit() {
// All sites
this.sitesService.getsites().subscribe(
(response) => this.updatesites(response),
(error) => console.log(error)
);
// Selected site
this.selectedsite = {
name: this.route.snapshot.params['name']
};
this.route.params.subscribe(
(params: Params) => {
this.selectedsite.name = params['name'];
console.log(params);
return this.selectedsite.name;
}
);
}
updatesites(sitesResponse) {
this.sites = sitesResponse;
this.sites = JSON.parse(this.sites._body);
}
}
HTML Template code is:
<nav class="navbar navbar-toggleable-md navbar-inverse fixed-top bg-inverse">
<button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbarCollapse" aria-controls="navbarCollapse" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<a class="navbar-brand" href="index.html">
<span class="navbar-brand-heavy">DEMO</span><span class="navbar-brand-light">sites</span> {{selectedSite.name}}
</a>
<div class="collapse navbar-collapse" id="navbarCollapse" *ngIf="sites">
<ul class="navbar-nav mr-auto">
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle selectedSite" href="#" id="dropdown01" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">{{selectedSite.name}}</a>
<div class="dropdown-menu" aria-labelledby="sites dropdown" id="sitesdropdown">
<a class="dropdown-item">
<input type="text" class="form-control" [(ngModel)]="filteredSites">
</a>
<a *ngFor="let site of sites"
class="dropdown-item"
[routerLink]="['/home', site.Title]"
>
{{ site.Title }}
</a>
</div>
</li>
<li class="nav-item">
<a class="nav-link" routerLinkActive="active" [routerLink]="['/home', 'selectedSite']">Home</a>
</li>
<li class="nav-item">
<a class="nav-link" routerLinkActive="active" [routerLink]="['/details', selectedSite.name]">Details</a>
</li>
</ul>
<form class="form-inline mt-2 mt-md-0">
<input class="form-control mr-sm-2" type="text" placeholder="Search">
</form>
</div>
</nav>
这并不提供答案的问题。要批评或要求作者澄清,请在其帖子下方留言。 - [来自评论](/ review/low-quality-posts/17577206) – bob
不确定你在说什么?问题是如何捕捉路线值,我的答案显示如何。 – JohanP
这不起作用。它看起来像ngOnit()触发一次,永远不会再次,所以我似乎无法获得路由值。你能提供一个更清晰的例子吗? –