Angular 2 declare global variable Typescript

What is the Best way to Declare and Access a Global Variable in Angular 2?

This post helps us to learn “Declare and Access a Global Variable in Angular 2” using “Typescript” and also share the steps to create and use of this global variables.

Steps –
1.     Create Global Variables.
2.     Import and Use the Global Variables in the Component.
3.     Result

Create Global Variables :- “app.global.ts”

import { Injectable } from '@angular/core';

@Injectable()
export class AppGlobals {
    readonly baseAppUrl: string = 'http://localhost:57431/';
    readonly baseAPIUrl: string = 'https://api.github.com/';
}

Import and Use the Global Variables in the Component:- “user.component.ts”

import { Component, Injectable} from '@angular/core';
import { CommonModule } from '@angular/common';
import { HttpModule, Http } from '@angular/http';
import { UserService } from '../service/user.service';
import { AppGlobals } from '../shared/app.globals';


@Component({
    selector: 'user',
    templateUrl: './user.component.html',
    styleUrls: ['./user.component.css'],
    providers: [UserService, AppGlobals]
})

export class UserComponent {
    //USERS DECLARATIONS.
    users = [];

    //HOME COMPONENT CONSTRUCTOR
    constructor(private userService: UserService, private _global: AppGlobals) { }

    //GET USERS SERVICE ON PAGE LOAD.
    ngOnInit() {
        this.userService.getAPIUsers(this._global.baseAPIUrl + 'users/hadley/orgs').subscribe(data => this.users = data);
        this.userService.getAppUsers(this._global.baseAppUrl + 'api/User/GetUsers').subscribe(data => console.log(data));  
    }
}
//END BEGIN – USERCOMPONENT

“user.server.ts” :-

import { Injectable, InjectionToken } from '@angular/core';
import { Http, Response } from '@angular/http';
import 'rxjs/add/operator/map';

//BEGIN-REGION - USERSERVICE
@Injectable()
export class UserService {
    constructor(private _http: Http) {
    }

    getAPIUsers(apiUrl) {
        return this._http.get(apiUrl).map((data: Response) => data.json());
    }

    getAppUsers(apiUrl) {
        return this._http.get(apiUrl).map((data: Response) => data);
    }
}
//END BEGIN – USERSERVICE

Result:-




ANIL SINGH

Anil Singh is an author, tech blogger, and software programmer. Book writing, tech blogging is something do extra and Anil love doing it. For more detail, kindly refer to this link..
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