How to bundle Angular $http.get() calls?

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Is it possible to bundle $http.get() calls and elegantly set the $scope variables for both returned arrays, without having to write state logic for both scenarios, e.g. a returns before b, b returns before a?,Connect and share knowledge within a single location that is structured and easy to search., Can sanitary pads be a better alternate to gauze to reduce or stop bleeding? , 1 FYI - the question title says "chain" but the body describes a join. Not sure if an edit is appropriate here. – Kevin Hakanson Nov 5 '15 at 0:59

You can use $q.all to "join" the results of your http calls, with code similar to:

app.controller("AppCtrl", function($scope, $http, $q) {

         $q.all([
            $http.get('/someUrl1'),
            $http.get('/someUrl2')
         ]).then(function(results) {
            /* your logic here */
         });
      }
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When the observable completes, it will call the complete() callback. There is no need for this call back as the subscription completes when the data is received.,When we subscribe to any observable, we optionally pass the three callbacks. next(),  error()  &  complete().,Next() callback is where we get the result of the observable. In this example the list of repositories for the given user.,We inject the HttpClient using the Dependency Injection

This guide explains how to make HTTP GET requests using the HttpClient module in Angular. The Angular introduced the HttpClient Module in Angular 4.3. It is part of the package @angular/common/http.  In this tutorial, let us build an HTTP GET example app, which sends the HTTP Get request to GitHub repository using the GitHub API.

HttpClient

This guide explains how to make HTTP GET requests using the HttpClient module in Angular. The Angular introduced the HttpClient Module in Angular 4.3. It is part of the package @angular/common/http.  In this tutorial, let us build an HTTP GET example app, which sends the HTTP Get request to GitHub repository using the GitHub API.

HttpClient

This guide explains how to make HTTP GET requests using the HttpClient module in Angular. The Angular introduced the HttpClient Module in Angular 4.3. It is part of the package @angular/common/http.  In this tutorial, let us build an HTTP GET example app, which sends the HTTP Get request to GitHub repository using the GitHub API.

@angular / common / http
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If responseType is the default json, you can pass a type interface for the resulting object as a type parameter to the call.,Constructs an observable for a generic HTTP request that, when subscribed, fires the request through the chain of registered interceptors and on to the server.,Constructs a request where response type and requested observable are not known statically.,Constructs a PUT request that interprets the body as an ArrayBuffer and returns an observable of the full HTTP response.

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We are using the new HttpClient client module, and injecting it in the constructor,then we are calling the get() method, which is returning an Observable,This syntax is more generic because we are passing in an initial argument which defines the HTTP method that we are using, in this case GET.,Instead, a call to set will return a new HttpParams object containing the new value properties. So this means that the following will NOT work:

The HTTP GET can also receive parameters, that correspond to the parameters in the HTTP url. Let's take for example the following URL with some pagination parameters:

https: //angular-http-guide.firebaseio.com/courses.json?orderBy="$key"&limitToFirst=1
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In this tutorial, you've learned to use Angular 7/8 and HttpClient to send HTTP requests to the server.,Throughout this tutorial, you'll learn, by example, to use Angular 7/8 and HttpClient to send HTTP requests or make API calls to RESTful endpoints of remote servers in order to fetch data.,Angular provides the HttpClient module which allows developers to send HTTP requests and make API calls to remote HTTP servers.,Importing HttpClient and sending Http get, post, put and delete requests to the server,

$ npm install - g @angular / cli
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Let's start with a simple HTTP request using the Angular Http service.,In this example, we will use the mergeMap operator. Let's take a look at the code example first.,Learn the basics of using Http Interceptors to handle Http requests in Angular.,When we get the character back, we then need to fetch that character's homeworld from the same API but a different REST endpoint. This example is sequential. Make one request then the next.

Let's start with a simple HTTP request using the Angular Http service.

import {
   Component
} from '@angular/core';
import {
   HttpClient
} from '@angular/common/http';
@Component({
   selector: 'app-root',
   templateUrl: 'app/app.component.html'
}) export class AppComponent {
   constructor(private http: HttpClient) {}
   ngOnInit() {
      this.http.get('/api/people/1').subscribe(json => console.log(json));
   }
}
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Then, just run npm or yarn install inside of both the public and server folders to get started.,This will navigate to the server folder and start our API server.,That's all we need to do to start using the new HttpClient, so let's get started updating our services!,Progress collects the Personal Information set out in our Privacy Policy and Privacy Policy for California Residents and uses it for the purposes stated in that policy.

To follow along, clone the sample project for my course, Upgrading AngularJS (a comprehensive video course all about upgrading from AngularJS to Angular). You can check out this commit:

git checkout 6e09 b071be9badd5bf3d0140f4a76c7ee0e880f6
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For more information about the Observable object, see the ReactiveX documentation.,The Observable classes in Angular 2 are provided by the ReactiveX library.,You explained well, better than the documentation. ,Now that we have seen the entire lifetime of an Observable object, we can refactor part of the logic into a Service for reusability.

<html>
  <head>
    <title>Angular2 Http Demo</title>
    <script src="node_modules/zone.js/dist/zone.js"></script>
    <script src="node_modules/reflect-metadata/Reflect.js"></script>
    <script src="node_modules/systemjs/dist/system.src.js"></script>
    <script src="systemjs.config.js"></script>
    <script>
      System.import('app').catch(function(err){ console.error(err); });
    </script>
  </head>
  <body>
    <demo-app>Loading...</demo-app>
  </body>
</html>
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