Angular: append query parameters to URL

Im using this:

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

But this is not working, i dont append param in url. Any suggestion?

This could be archived by using the Router class:

Using a component:

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
    });
   }
}

For more info check this book and the angular Router API

I had to adjust Jota.Toledos answer a bit so that it works for me, I had to take out the second and the last property of the extras - object:

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

You should write

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

You'll want to take the current state of the query parameters from the Angular Router, modify those props (add / delete parameters), then reassign it using the Router:

// Make sure to import and define the Angular Router and current Route in your constructor
constructor(
  private router: Router,
  private route: ActivatedRoute
) {}

...
...
...

// Take current queryParameters from the activated route snapshot
const urlParameters = Object.assign({}, this.route.snapshot.queryParams); 

// Need to delete a parameter ?
delete urlParameters.parameterName;

// Need to add or updated a parameter ?
urlParameters.parameterName = newValue;

// Update the URL with the Angular Router with your new parameters
this.router.navigate([], { relativeTo: this.route, queryParams: urlParameters });

You could even go further and build a utility function to do this:

handleUrlParameters(paramsToAdd: {param: string}[], paramsToDelete?: string[]) {
  const urlParameters = Object.assign({}, this.route.snapshot.queryParams); 

  paramsToDelete.forEach(param => delete urlParameters[param]);

  Object.keys(paramsToAdd).forEach(param => urlParameters[param] = paramsToAdd[param]);

  this.router.navigate([], { relativeTo: this.route, queryParams: urlParameters });
}

And then you simply call handleUrlParameters with an object mapping a parameter to new values, or an array of parameter names to delete.

this.router.navigate(['.'], { relativeTo: this.route, queryParams: { 'a': 'b' }, queryParamsHandling: 'merge', skipLocationChange: true});

router: Router route: ActivatedRoute

You should use Router module. check this doc: https://angular.io/guide/router

You need import these modules: import { Router, ActivatedRoute, ParamMap } from '@angular/router';

Make sure while passing query params value should not be undefined.

      this.router.navigate([yourRoute,
         queryParams : 
              {
                key : (yourValue ? yourValue : '')
              },
         queryParamsHandling: 'merge'
            ]);