What is the best way to make a POST request and pass two parameters when calling an API in Ionic?

Struggling to implement API calls in Ionic for the purpose of signing in. Unsure of the correct method to make the call.

Previous attempts to call the API have been unsuccessful.

signin.ts

import { Component } from '@angular/core';
import { NavController, NavParams } from 'ionic-angular';
import { HTTP } from '@ionic-native/http'

@Component({
  selector: 'page-sign-in',
  templateUrl: 'sign-in.html',
})
export class SignInPage {

  private signinUrl:"*someurl*";

  email="";
  password="";

  constructor(public navCtrl: NavController, public navParams: NavParams,
  private http:HTTP) {
  }

  ionViewDidLoad() {
    console.log('ionViewDidLoad SignInPage');
  }

  signinClick(){
    this.callSignInApi(this.email,this.password);
  }

  callSignInApi(email:string,password:string){
    console.log('api email',email);
    console.log('api pass',password);

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

    this.http.post(this.signinUrl,urlSearchParams.toString(),{})
    .then(data => {

      console.log("data status",data.status);
      console.log("data data",data.data); // data received by server
      console.log("data headers",data.headers);

    })
    .catch(error => {

      console.error("catching error",error);
      console.log("error status",error.status);
      console.log("error error",error.error); // error message as string
      console.log("error headers",error.headers);

    });
  }

}

Encountering an error when trying to call the API on button click, with the error being null. Unsure of the specific error message or how to correctly pass parameters.

Answer №1

If you want to make an API call in Angular, you can use the Http module from @angular/http.

Start by adding the HttpModule to your app.module.ts file:

import { HttpModule } from '@angular/http';
  imports: [
    ..,
    HttpModule,

Then, in your component file, inject the Http module:

constructor(public http: Http,.....

To make the API call, you can use the following code:

this.http.post(this.signinUrl,urlSearchParams.toString(), 
     {}).subscribe(
        data=>{
        ......
       },error=>{
        .....
       });

Answer №2

Give this a shot:

let userCredentials = {
      'username': email,
      'password': password
  };

this.http.post(this.signinUrl,userCredentials,{})
    .then(result => {
         // response from server
     })
     .catch(err => {
         // error message in string format
     });

Hopefully this solution works for you. If not, consider adding headers like this:

this.http.post(this.signinUrl,userCredentials,{'Content-Type': 'application/x-www-form-urlencoded'})
.then(result => {
  // response from server
})
.catch(err => {
  // error message in string format
});

Answer №3

To successfully send parameters in an HTTP request without using a JSON object, you can convert the parameter object to a URI and then pass it as shown in the following working example:

this.http.post(this.signinUrl, this.formData(urlSearchParams), {'Content-Type': 'application/x-www-form-urlencoded'})
.then(data => {
 // Server response data
})
.catch(error => {
// Error message as a string
});



/** Function to convert Object to URL parameters for HTTP request */
 formData(myFormData) {
   return Object.keys(myFormData).map(function (key) {
     return encodeURIComponent(key) + '=' + encodeURIComponent(myFormData[key]);
 }).join('&');
}

Answer №4

Bring in Angular's HTTP module.

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

Eliminate the use of toString() when making an HTTP POST request:

this.http.post(this.signinUrl, urlSearchParams).subscribe(
    data=>{
    ......
   },error=>{
    .....
   });

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