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Beginner’s Guide to Angular 4: HTTP

  • In this tutorial, you’ll learn how to communicate with web APIs and services from an Angular application using Angular .
  • Let’s create a separate file to create an Angular service for making the API call.
  • As seen in the above code, you need to provide the API post URL and the data to be posted as the second parameter.
  • Here is how the modified code from the   looks: – – Modify the variable in the file to create a non-existent URL which would cause an error when making the API call.
  • In this tutorial, you saw how to make use of the Angular to make API calls.

In the previous tutorial, you saw how to implement routing in Angular web applications using Angular routing. In this tutorial, you’ll learn how to communicate with web APIs and services from an…

In the previous tutorial, you saw how to implement routing in Angular web applications using Angular routing. 

object makes it possible to update a portion of the web page without reloading the entire page. You can send and receive data from the server once the web page has loaded.

object, making it easier to make API calls from the Angular application. 

From the official documentation:

include testability support, strong typing of request and response objects, request and response interceptor support, and better error handling via apis based on Observables.

You’ll start by cloning the source code from the first part of the tutorial series.

Once you have the source code, navigate to the project directory and install the required dependencies.

cd AngularComponent npm install

After the dependencies have been installed, start the application by typing the following command:

ng serve

You should have the application running on http://localhost:4200/.

file.

import {HttpClientModule} from ‘@angular/common/http’;

under the imports section.

imports: [ BrowserModule, FormsModule, HttpClientModule ]

file looks:

import { BrowserModule } from ‘@angular/platform-browser’; import { NgModule } from ‘@angular/core’; import { AppComponent } from ‘./app.component’; import { CalcComponent } from ‘./calc/calc.component’ import { FormsModule } from ‘@angular/forms’; import { HttpClientModule } from ‘@angular/common/http’; @NgModule({ declarations: [ AppComponent, CalcComponent ], imports: [ BrowserModule, FormsModule, HttpClientModule ], providers: [], bootstrap: [AppComponent] }) export class…

Beginner’s Guide to Angular 4: HTTP