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How to get query parameters from URL in Angular 5?


Question

I'm using angular 5.0.3, I would like to start my application with a bunch of query parameters like /app?param1=hallo&param2=123. Every tip given in How to get query params from url in Angular 2? does not work for me.

Any ideas how to get query parameters work?

private getQueryParameter(key: string): string {
  const parameters = new URLSearchParams(window.location.search);
  return parameters.get(key);
}

This private function helps me to get my parameters, but I don't think it is the right way in new Angular environment.

[update:] My main app looks like

@Component({...})
export class AppComponent implements OnInit {

  constructor(private route: ActivatedRoute) {}

  ngOnInit(): void {
    // would like to get query parameters here...
    // this.route...
  }
}
2020/01/23
1
197
1/23/2020 2:33:53 PM


This is the cleanest solution for me

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

export class MyComponent {
  constructor(
    private route: ActivatedRoute
  ) {}

  ngOnInit() {
    const firstParam: string = this.route.snapshot.queryParamMap.get('firstParamKey');
    const secondParam: string = this.route.snapshot.queryParamMap.get('secondParamKey');
  }
}
2018/06/23

I know that OP asked for Angular 5 solution, but yet for all of you who stumbles upon this question for newer (6+) Angular versions. Citing the Docs, regarding ActivatedRoute.queryParams (which most of other answers are based on):

Two older properties are still available. They are less capable than their replacements, discouraged, and may be deprecated in a future Angular version.

params — An Observable that contains the required and optional parameters specific to the route. Use paramMap instead.

queryParams — An Observable that contains the query parameters available to all routes. Use queryParamMap instead.

According to the Docs, the simple way to get the query params would look like this:

constructor(private route: ActivatedRoute) { }

ngOnInit() {
    this.param1 = this.route.snapshot.paramMap.get('param1');
    this.param2 = this.route.snapshot.paramMap.get('param2');
}

For more advanced ways (e.g. advanced component re-usage) see this Docs chapter.

EDIT:

As it correctly stated in comments below, this answer is wrong - at least for the case specified by OP.

OP asks to get global query parameters (/app?param1=hallo&param2=123); in this case you should use queryParamMap (just like in @dapperdan1985 answer).

paramMap, on the other hand, is used on parameters specific to the route (e.g. /app/:param1/:param2, resulting in /app/hallo/123).

Thanks to @JasonRoyle and @daka for pointing it out.

2019/08/27

You can also Use HttpParams, such as:

  getParamValueQueryString( paramName ) {
    const url = window.location.href;
    let paramValue;
    if (url.includes('?')) {
      const httpParams = new HttpParams({ fromString: url.split('?')[1] });
      paramValue = httpParams.get(paramName);
    }
    return paramValue;
  }
2018/09/28

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

constructor(private route: ActivatedRoute) {}

ngOnInit() {
    console.log(this.route.snapshot.queryParamMap);
}

UPDATE

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

export class LoginComponent {
    constructor(private router: Router) {
        const snapshot: RouterStateSnapshot = router.routerState.snapshot;
        console.log(snapshot);  // <-- hope it helps
    }
}
2017/11/30

its work for me:

constructor(private route: ActivatedRoute) {}

ngOnInit()
{
    this.route.queryParams.subscribe(map => map);
    this.route.snapshot.queryParams; 
}

look more options How get query params from url in angular2?

2018/01/06