typescript - Angular2 - Http POST request parameters

Question

I'm trying to make a POST request but i can't get it working:

testRequest() {
      var body = 'username=myusername?password=mypassword';
      var headers = new Headers();
      headers.append('Content-Type', 'application/x-www-form-urlencoded');

      this.http
        .post('/api',
          body, {
            headers: headers
          })
          .subscribe(data => {
                alert('ok');
          }, error => {
              console.log(JSON.stringify(error.json()));
          });
}

I basically want to replicate this http request (not ajax) like it was originated by a html form:

URL: /api

Params: username and password

Answer 1

Update for Angualar 4.3+

Now we can use HttpClient instead of Http

Guide is here

Sample code

const myheader = new HttpHeaders().set('Content-Type', 'application/x-www-form-urlencoded')
let body = new HttpParams();
body = body.set('username', USERNAME);
body = body.set('password', PASSWORD);
http
  .post('/api', body, {
    headers: myheader),
  })
  .subscribe();

---

Deprecated

Or you can do like this:

let urlSearchParams = new URLSearchParams();
urlSearchParams.append('username', username);
urlSearchParams.append('password', password);
let body = urlSearchParams.toString()

---

Update Oct/2017

From angular4+, we don't need headers, or .toString() stuffs. Instead, you can do like below example

import { URLSearchParams } from '@angular/http';

POST/PUT method

let urlSearchParams = new URLSearchParams();
urlSearchParams.append('username', username);
urlSearchParams.append('password', password);
this.http.post('/api', urlSearchParams).subscribe(
      data => {
        alert('ok');
      },
      error => {
        console.log(JSON.stringify(error.json()));
      }
    )

GET/DELETE method

    let urlSearchParams = new URLSearchParams();
    urlSearchParams.append('username', username);
    urlSearchParams.append('password', password);
    this.http.get('/api', { search: urlSearchParams }).subscribe(
      data => {
        alert('ok');
      },
      error => {
        console.log(JSON.stringify(error.json()));
      }
    )

For JSON application/json Content-Type

this.http.post('/api',
      JSON.stringify({
        username: username,
        password: password,
      })).subscribe(
      data => {
        alert('ok');
      },
      error => {
        console.log(JSON.stringify(error.json()));
      }
      )