Problem with execution of TypeScript function from HTML

I have been facing an issue where I am attempting to click a button on an HTML page to trigger a TypeScript function called `getToken()`. Strangely, the function does not seem to get executed when the button is clicked. Surprisingly, I have tested the `getToken()` function separately by calling it from within the constructor, and it works perfectly fine without any errors or warnings being displayed in the browser's Console.

Below is the snippet of code from `app.module.ts` that contains the `getToken` method I am trying to invoke from the HTML file:

import { NgModule }      from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { HttpModule } from '@angular/http';
import { Injectable } from '@angular/core';
import { Http, Response } from '@angular/http';
import { RequestOptions, Request, RequestMethod } from '@angular/http';
import { Observable } from 'rxjs/Observable';
import 'rxjs/add/operator/map';


@NgModule({
    imports:      [ BrowserModule, HttpModule ],
    declarations: [AppComponent],
    bootstrap: [AppComponent]
})


@Injectable()
export class AppModule {

    constructor(private http: Http) {}

    private _token: string;

    public getToken() {
        let url = "https://my.domain.net/oauth/token";

        let urlSearchParams = new URLSearchParams();
        urlSearchParams.append('grant_type', 'password');
        urlSearchParams.append('username', 'myUserName');
        urlSearchParams.append('password', 'myPassword');
        let body = urlSearchParams.toString()

        this.http.post(url, body)
            .map(res => res.json())
            .subscribe(
            data => { this._token = data.access_token; alert("TOKEN: " + this._token); console.log(data); },
            err => console.log(err),
            () => console.log('Fetching complete for Server Metrics')
        );
    }
}

This is how I am trying to call the TypeScript function in the HTML file:

<button (click)="getToken()">Get Token</button>

Answer №1

It looks like there are some key issues in your code that need to be addressed. I recommend checking out the documentation available at https://angular.io for guidance.

  • One problem is that you have declared your AppModule as an @Injectable, which is incorrect.
  • You also seem to have logic embedded within your AppModule.
  • Additionally, it appears that you believe you can call a method from any template, when in fact this should only be done within the template of a component or within the templateUrl.

To resolve these issues, consider removing the @Injectable() and relocating your logic to the AppComponent. This change, assuming no other errors exist, should help improve your code.

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