Angular 2 http.get with params

Question

I want to send query parameters within a GET request. My class looks like this:

 @Injectable()
 export class Loader implements TranslateLoader{
  constructor(private http: Http){
   }
   getTranslation(lang: string): Observable<any>
   {
     return this.http.get(routes.Localization.Get) ;// in that place I need to pass params
   }
 }

How can I do this?

Answer 1

You can leverage the URLSearchParams class for this:

getTranslation(lang: string): Observable<any> {
  let params = new URLSearchParams();
  params.set('param1', 'value1');

  return this.http.get(routes.Localization.Get, { search: params });
}

This will result to an URL like this (parameters are added in the query string): http://...?param1=value1.

See the documentation of this class:

• https://angular.io/docs/ts/latest/api/http/index/URLSearchParams-class.html

It now providers support for encoding / decoding parameters.

Answer 2

This is pretty simple - you can define your URLSearchParams and pass them in the second parameter of the http.get method:

import { URLSearchParams } from '@angular/http'

let params: URLSearchParams = new URLSearchParams();
params.set('param1', 'someValue');
params.set('param2', 'someValue');

return this.http.get(routes.Localization.Get, { search: params });

Answer 3

When an URL like this http://stackoverflow.com?param1=value

You can get the param1 by code follow:

import { Component, OnInit } from '@angular/core';
import { Router, ActivatedRoute, Params } from '@angular/router';

@Component({
    selector: '',
    templateUrl: './abc.html',
    styleUrls: ['./abc.less']
})
export class AbcComponent implements OnInit {
    constructor(private route: ActivatedRoute) { }

    ngOnInit() {
        // get param
        let param1 = this.route.snapshot.queryParams["param1"];
    }
}