获取路线查询参数获取路线查询参数(Get route query params)

我试图从RC1到RC4迁移和我有麻烦的查询字符串参数。 ActivatedRoute对象总是空的。

hero.component.ts

import {Component, OnInit} from "@angular/core";
import {Control} from "@angular/common";
import {ROUTER_DIRECTIVES, ActivatedRoute} from '@angular/router';

@Component({
    template: '../partials/main.html',
    directives: [ROUTER_DIRECTIVES]
})

export class HeroComponent implements OnInit {

    constructor(private _activatedRoute: activatedRoute) {

    }

    ngOnInit() {
        this._activatedRoute.params.subscribe(params => {
            console.log(params);
        });
    }
}

main.ts

import {bootstrap} from '@angular/platform-browser-dynamic';
import {HTTP_PROVIDERS, RequestOptions, Http} from '@angular/http';
import {AppRouterProviders} from './app.routes';

bootstrap(AppComponent, [
    AppRouterProviders,
    HTTP_PROVIDERS
]);

app.component.ts

import {Component, OnInit} from '@angular/core';
import {HeroComponent} from './hero.component';
import {RouteConfig, Router, ROUTER_DIRECTIVES} from '@angular/router';


@Component({
    selector: 'my-app',
    templateUrl: '../partials/main.html',
    directives: [
        HeroComponent,
        ROUTER_DIRECTIVES
    ]
})

export class AppComponent {
}

谐音/ main.html中

<a class="nav-link" [routerLink]="['/']" [queryParams]="{st: 'new'}">New</a>

app.routes.ts

import {provideRouter, RouterConfig}  from '@angular/router';
import {HeroComponent} from './hero.component';
import {ErrorComponent} from './error.component';

const routes: RouterConfig = [
    {path:'', component: HeroComponent},
    {path:'**', component: ErrorComponent}
];

export const AppRouterProviders = [
    provideRouter(routes)
];

当我点击链接“新建”控制台打印出空对象

对象{}

更新

plunker

Answer 1:

更新（2.0.0最终）

（ somepath/:someparam/someotherpath ），你可以使用订阅这些_router.queryParams.subscribe(...)

export class HeroComponent implements OnInit {
  constructor(private _activatedRoute: ActivatedRoute, private _router:Router) {
    _activatedRoute.queryParams.subscribe(
      params => console.log('queryParams', params['st']));

原版的

如果你想queryParams代替路线PARAMS（ somepath/:someparam/someotherpath ），你可以使用订阅这些_router.routerState.queryParams.subscribe(...)

export class HeroComponent implements OnInit {
  constructor(private _activatedRoute: ActivatedRoute, private _router:Router) {
    _router.routerState.queryParams.subscribe(
      params => console.log('queryParams', params['st']));

Plunker例子

Answer 2:

我用了很长时间了同样的问题挣扎。 答案是棘手的，在文档中有人指出：

ActivatedRoute：被提供给一个包含路线特定信息，例如路由参数，静态数据，解析数据，全球查询参数，并且全局片段的每个路由组分A的服务。 这是中提到这里

诀窍答案是“路线组件”，这意味着ActivatedRoute将只对路由组件。 换句话说只部件在路由表中说明。

>阅读混淆官方文档在这里 。 它提到“与出口加载的组件相关联的路线”。 我们只能猜测是出口...

我写了一个小调查代码在单机app.module.ts研究这个问题：

import { Component, NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { RouterModule, Routes, ActivatedRoute } from '@angular/router';

@Component({
  selector: 'comp1',
  template: `<h4>comp1 works</h4>`,
})
export class Comp1 { }

@Component({
  selector: 'comp2',
  template: `<h4>comp2 works</h4>`,
})
export class Comp2 { }

@Component({
  selector: 'fail',
  template: `<div>Wrong URL:{{url | json}}</div> <h4>Failure page works</h4>`,
})
export class Fail {
  private url: any;
  constructor(public activeRoute: ActivatedRoute) {
    this.url = activeRoute.snapshot.url
  };

}

@Component({
  selector: 'app-root',
  template: `<div>Base URL:{{url | json}}</div> <router-outlet></router-outlet>`,
})
export class App {
  private url: any;
  constructor(public activeRoute: ActivatedRoute) {
    this.url = activeRoute.snapshot.url
  };
}

const appRoutes: Routes = [
  { path: '1', component: Comp1 },
  { path: '2', component: Comp2 },
  { path: '**', component: Fail }
];

@NgModule({
  imports: [BrowserModule, RouterModule.forRoot(appRoutes)],
  declarations: [App, Comp2, Comp1, Fail],
  bootstrap: [App]
})
export class AppModule { }

---

尝试运行以下URI的模块：

• HTTP：//本地主机：2分之4200
• HTTP：//本地主机：1分之4200
• HTTP：//本地主机：4200 / A / B / C

祝你好运，希望代码是示范。

Answer 3:

检查角文档，它都在那里： https://angular.io/docs/ts/latest/guide/router.html

constructor(
  private route: ActivatedRoute,
  private router: Router,
  private service: HeroService) {}

    ngOnInit() {
      this.sub = this.route.params.subscribe(params => {
         let id = +params['id']; // (+) converts string 'id' to a number
         this.service.getHero(id).then(hero => this.hero = hero);
       });

文章来源: Get route query params