Is there a way to transfer a variable from Angular 2 Frontend Express JS to an Angular 2 component?

After conducting thorough research, I have made specific modifications to my code. However, I am encountering some errors in my console that I cannot seem to resolve. Despite following a tutorial step by step.

Your assistance would be highly valued as I aim to export the variable "nameid" from my routes.js file for use in an Angular component.

angular-master/express/config/routes.js

var xmldoc = require('xmldoc');
var DOMParser = require('dom-parser');
module.exports = function (app, config, passport) {

  app.get('/', function (req, res) {
      res.redirect('/home')
  });

  app.get('/login',
    passport.authenticate(config.passport.strategy,
      {
        successRedirect: '/',
        failureRedirect: '/login'
      })
  );

  app.post('/', function(req, res) {
    console.log('body saml:', req.body.SAMLResponse);
    const body = req.body.SAMLResponse;
    var b = new Buffer(body, 'base64');
let text = b.toString('ascii');
    //var inflated = pako.inflateRaw(b, {to:'string'}); 
    console.log('formmatted saml',text);
     var document = new xmldoc.XmlDocument(text);
 console.log('formmatted document',document);
     var status = document.descendantWithPath("samlp:Status").firstChild.attr;
    
   var attr = text.includes("AttributeStatement");
   var nameid = text.substring(text.lastIndexOf("<NameID>") + 8,text.lastIndexOf("</NameID>"));
   module.exports.nameid = nameid;
    console.log("status id:", status['Value']);
console.log(attr);
  console.log('LDAP DB username: ' + nameid);
  
  

};

angular-master/src/app/site/user-history/user-history.component.ts

import { Component, OnInit } from '@angular/core';
import { RouterLink } from '@angular/router';
import { FormArray, FormControl, FormGroup, Validators } from '@angular/forms';
import { Observable } from 'rxjs';
import { HttpClient } from '@angular/common/http';
import { element } from 'protractor';
import { ActivatedRoute } from '@angular/router';
import { Router } from '@angular/router';

var routes = require('./../../../../express/config/routes.js');
    

@Component({
  selector: 'app-user-history',
  templateUrl: './user-history.component.html',
  styleUrls: ['../style.css']
})
export class UserHistoryComponent implements OnInit {


  constructor(
    private route: ActivatedRoute,
    private router: Router
  ) {}


  ngOnInit() {
  console.log(routes.nameid); 


}

The errors displayed in my console are as follows:

xmldoc.js:5 Uncaught ReferenceError: global is not defined
    at xmldoc.js:5
    at Object../node_modules/xmldoc/lib/xmldoc.js (xmldoc.js:339)
    at __webpack_require__ (bootstrap:76)
    at Object../node_modules/xmldoc/index.js (index.js:3)
    at __webpack_require__ (bootstrap:76)
    at Object../express/config/routes.js (routes.js:1)
    at __webpack_require__ (bootstrap:76)
    at Object../src/app/site/user-history/user-history.component.ts (user-history.component.ts:23)
    at __webpack_require__ (bootstrap:76)
    at Object../src/app/site/site.module.ts (main.js:8001)
(anonymous) @ xmldoc.js:5
./node_modules/xmldoc/lib/xmldoc.js @ xmldoc.js:339
__webpack_require__ @ bootstrap:76
./node_modules/xmldoc/index.js @ index.js:3
__webpack_require__ @ bootstrap:76
./express/config/routes.js @ routes.js:1
__webpack_require__ @ bootstrap:76
./src/app/site/user-history/user-history.component.ts @ user-history.component.ts:23
__webpack_require__ @ bootstrap:76
./src/app/site/site.module.ts @ main.js:8001
__webpack_require__ @ bootstrap:76
./src/app/app.module.ts @ app.component.ts:13
__webpack_require__ @ bootstrap:76
./src/main.ts @ environmentLoader.ts:21
__webpack_require__ @ bootstrap:76
0 @ main.ts:16
__webpack_require__ @ bootstrap:43
webpackJsonpCallback @ bootstrap:30
(anonymous) @ main.js:1

Answer №1

Whoops, it seems like import should be used instead of require.

import * as routes from './../../../../express/config/routes.js';
ngOnInit() {
  console.log(routes.nameid); 
}

But why are you trying to access a backend variable in the frontend? Remember, they operate on separate servers.

Answer №2

It is essential to recognize that Node.js functions as a server-side framework while Angular operates as a frontend framework, both requiring compilation.

Although they are both written in JavaScript, attempting to import server code into the frontend will not work with Angular's package.json and angular.json files as they do not recognize routes.js for compilation.

Angular is designed to be loaded within browsers using plain HTML and JavaScript.

To successfully integrate these frameworks, it is necessary to create an API.

Answer №3

global is the global object in Node.js, similar to window in a browser environment. This distinction is crucial as Node.js and browsers have separate environments - thus, attempting to access variables from one environment in another will result in errors.

Node.js code operates within its server-side runtime, whereas Angular code functions within the client-side browser environment. These distinct environments are unable to directly interact with each other's variables. Attempting to do so is simply not feasible or practical.

Answer №4

If you haven't already, consider trying a different tactic by importing only the specific variable you need instead of everything in your current approach.

Here's an example:

import { nameid } from './../../../../express/config/routes.js'

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