Angular:将查询参数附加到URL

Question

我用这个:

import { HttpParams } from '@angular/common/http';
let params = new HttpParams();
  params.append('newOrdNum','123');

但这不起作用,我不会在网址中附加param.有什么建议吗？

Answer 1

这可以通过使用Router类来存档:

使用组件:

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

@Component({})
export class FooComponent {
   constructor(
     private _route: ActivatedRoute,
     private _router: Router
   ){}

   navigateToFoo(){
     // changes the route without moving from the current view or
     // triggering a navigation event,
     this._router.navigate([], {
      relativeTo: this._route,
      queryParams: {
        newOrdNum: '123'
      },
      queryParamsHandling: 'merge',
      // preserve the existing query params in the route
      skipLocationChange: true
      // do not trigger navigation
    });
   }
}

有关更多信息,请查看本书和角度路由器API

Answer 2

我必须调整Jota.Toledos一点回答，以便它对我有用，我必须取出extras的第二个和最后一个属性-object：

   navigateToFoo(){
     this._router.navigate([], {
      queryParams: {
        newOrdNum: '123'
      },
      queryParamsHandling: 'merge',
    });
   }

Answer 3

你应该写

let params = new HttpParams();
params = params.append('newOrdNum','123');