The response of the Typescript Subscription function

Question

The response of the Typescript Subscription function

I'm struggling with retrieving the subscribe array in NG2.

Being new to typescript, I find it difficult to understand how to pass variables between functions and constructors.

This is what my code currently looks like:

export class RosterPage extends Page {

    roster:Roster[];
    players:Players[];

    roster_data:any;

    constructor(private location: Location, private playersService: PlayersService) {
        super(location);

        this.players = [];
        this.roster = [];

        this.roster_data = this.getRoster();

        for (let i of this.roster_data) {
            console.log(i); // I need to iterate through
   }

   getRoster() {
        return this.playersService.getRoster("2017","MUZ").subscribe(roster => {
            this.roster = roster["soupiska"];
        });
    }
}

arrays angular typescript constructor

Answer 1

Answer №1

Check out How to Handle Asynchronous Calls on Stack Overflow for tips on managing async calls. This guide will help you understand how to work with asynchronous operations, such as fetching or sending data to a server.

Make sure to implement OnInit and move any data retrieval tasks that need to be performed upon loading to that method instead of the constructor.
I've edited out irrelevant parts to focus on the core issue and provide a clearer explanation of what's happening in your code.

Sample Code:

// Import OnInit
import { OnInit } from '@angular/core';

// Implement OnInit
export class RosterPage extends Page implements OnInit {

    roster: Roster[] = [];

    constructor(private location: Location, private playersService: PlayersService) {
        super(location);
    }

    // Initiate any async/server calls in ngOnInit, NOT in the constructor
    ngOnInit() {
        this.loadRoster();
    }

    // Fetch data from the service
    loadRoster() {
        // Initiate an async call to get the roster from the service
        this.playersService.getRoster("2017", "MUZ").subscribe(roster => {
            // Upon completion of the call, access the retrieved data
            // The following is a callback function
            // You now have the data available
            // Copy necessary data to your component/page using this.xxxx
            this.roster = roster["soupiska"];
        });
    }
}

Answer 2

Check out How to Handle Asynchronous Calls on Stack Overflow for tips on managing async calls. This guide will help you understand how to work with asynchronous operations, such as fetching or sending data to a server.

Make sure to implement OnInit and move any data retrieval tasks that need to be performed upon loading to that method instead of the constructor.
I've edited out irrelevant parts to focus on the core issue and provide a clearer explanation of what's happening in your code.

Sample Code:

// Import OnInit
import { OnInit } from '@angular/core';

// Implement OnInit
export class RosterPage extends Page implements OnInit {

    roster: Roster[] = [];

    constructor(private location: Location, private playersService: PlayersService) {
        super(location);
    }

    // Initiate any async/server calls in ngOnInit, NOT in the constructor
    ngOnInit() {
        this.loadRoster();
    }

    // Fetch data from the service
    loadRoster() {
        // Initiate an async call to get the roster from the service
        this.playersService.getRoster("2017", "MUZ").subscribe(roster => {
            // Upon completion of the call, access the retrieved data
            // The following is a callback function
            // You now have the data available
            // Copy necessary data to your component/page using this.xxxx
            this.roster = roster["soupiska"];
        });
    }
}

Answer 3

Answer №2

The logic should be implemented within the getRoster() function.

export class RosterPage extends Page {

roster:Roster[];
players:Players[];


roster_data:any;

constructor(private location: Location, private playersService: PlayersService) {
    super(location);

    this.players = [];
    this.roster = [];


    this.roster_data = this.getRoster();

    getRoster() {
       return this.playersService.getRoster("2017","MUZ").subscribe(roster => {
           this.roster = roster["soupiska"];
           for (let i of this.roster) console.log(i); // It is necessary to iterate through
       });
}

Answer 4

The logic should be implemented within the getRoster() function.

export class RosterPage extends Page {

roster:Roster[];
players:Players[];


roster_data:any;

constructor(private location: Location, private playersService: PlayersService) {
    super(location);

    this.players = [];
    this.roster = [];


    this.roster_data = this.getRoster();

    getRoster() {
       return this.playersService.getRoster("2017","MUZ").subscribe(roster => {
           this.roster = roster["soupiska"];
           for (let i of this.roster) console.log(i); // It is necessary to iterate through
       });
}

The response of the Typescript Subscription function

Answer №1

Answer №2

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