angular 8 service example stackblitz
How to open angular 8 in default browser?
Using that "--open" parameters, will automatically open the Angular 8 in your default web browser. Here's the Angular 8 default page look like. For this tutorial, we will use one of the Local JSON file or the remote REST API service that will consume or call by Angular HttpClient.
What is alert service in angular?
The alert service ( /src/app/_alert/alert.service.ts) acts as the bridge between any component in an Angular application and the alert component that actually displays the alert / toaster messages. It contains methods for sending, clearing and subscribing to alert messages.
What is angular 8 httpclient?
The Angular 8 HttpClient simplified the client HTTP API on the XMLHttpRequest interface exposed by browsers. The Angular HttpClient has features of testability features, typed request and response objects, request and response interception, Observable APIs, and streamlined error handling.
Preparation
We will start this tutorial by creating an Angular 8 app using Angular CLI. First, we will install Angular CLI using this command in the terminal or Node.js command line. Next, create a new Angular 8 app using Angular CLI by type this command. That command will create a new Angular 8 app with the name `angular-httpclient` and pass all questions as
Setup Local Json File Or Remote Rest API Service
For this tutorial, we will use one of the Local JSON file or the remote REST API service that will consume or call by Angular HttpClient. For local JSON file, simply, create a new folder inside `src/assets`. Open and edit `src/assets/data/smartphone.json` then add these lines of JSON data. Now, the local JSON file is ready to use with your Angular
Setup Angular 8 HttpClient
The Angular 8 HttpClient simplified the client HTTP API on the XMLHttpRequest interface exposed by browsers. The Angular HttpClient has features of testability features, typed request and response objects, request and response interception, Observable APIs, and streamlined error handling. This module already included when creating a new Angular app
Basic Local Json Or Resp API Request Example
We will put all REST API or JSON requests in the Angular Service. To do that, generate an Angular Service using this Angular Schematic command. Open and edit `src/app/api.service.ts` then add this import of HttpClient that part of @angular/common/http. Inject that HttpClient module to the constructor of the Angular service. Declare a constant varia
Angular HttpClient Error Handling
We have to add an error handling to handle any error on every HttpClient requests. To do that, simply open and edit `src/app/api.service.ts` then add this function that handles the error in a simple way. In the above codes, we are creating 2 functions for handle error and print log of error. There are the new required modules, so, add it to existin
Angular HttpHeaders
Almost in every HTTP requests including headers. Sometimes, REST API servers required additional headers parameters on every request. For example, the secured REST API endpoint only accessible with an Authorization header token, the specific REST API request use a different type of response by determining the type from the HTTP headers. To add the
HttpClient Post, Put, and Delete Request
To send data to the REST API is really simple with Angular HttpClient. Still, in the same API service file, add a function to POST data to the REST API. Back to the Angular component, declare the data variable with a type and a variable for the response. Add this function to perform POST data using ApiService. Where postdata variable is a typed obj
Angular HttpParams
We can add custom URL parameters using Angular HttpParams. Still, on the ApiService file, add this function of the HttpParams usage example. Don't forget to add or modify the import of HttpParams. Also, the HttpParams can be extracted from the string. Add this function to use get HttpParams from the string. djamware.com
Conclusion
As you see, this tutorial of Angular HttpClient example did not cover all Angular HttpClient features and related. It just regular daily use of accessing or consume REST API server using Angular HttpClient. We will show you more examples for each advance features of the Angular HttpClient in a separate tutorial. You can check the full source codes
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