What is the best method for saving information from a service to a class or interface in Angular 2?

Question

What is the best method for saving information from a service to a class or interface in Angular 2?

I am currently in the process of developing a new web application and I am fairly inexperienced with Angular2. I am encountering an issue with one of my components that acts as a form for users to update their data.

The problem lies in accessing specific data within my JSON file. I have attempted to store the data in an object of a class but it seems like my implementation might be incorrect, as it is not achieving the desired functionality. Below is my UserDetailsComponent:

UserDetailsComponents.ts

import { Component, OnInit, OnDestroy, ViewChild  } from '@angular/core';
import { Router, ActivatedRoute, Params } from '@angular/router';
import { FormControl, FormGroup, FormBuilder, Validators } from '@angular/forms';
import { ModalDirective } from 'ng2-bootstrap/modal/modal.component';

import { ApiService } from '../../assets/services/api.service';

import { UserDetails } from '../../assets/classes/user-details';

@Component({
  selector: 'app-user-details',
  templateUrl: './user-details.component.html',
  styleUrls: ['./user-details.component.scss']
})
export class UserDetailsComponent implements OnInit, OnDestroy {

    id: any;
    data: UserDetails;

    private sub: any;

    constructor(
      private route: ActivatedRoute,
      private apiService: ApiService,
      private fb: FormBuilder) {}

    ngOnInit() {
      this.createForm();
      this.sub = this.route.params.subscribe(params =>{
        this.id = params['id']; //console.log(this.id);
        this.apiService.getUserById(this.id).subscribe(values => 
          this.data = values[0];
         ) 
      })
    }
}

And below is my userDetails class

UserDetails.ts

export class UserDetails {
    id: string;
    first_name: string;
    last_name: string;
    status: boolean;
}

My goal is to simply use this.data to access the id, first_name, last_name, and status within the component.

Example

createForm(data){
      this.userDetailForm = this.fb.group({
        id: [this.data.id],
        first_name: [this.data.first_name, Validators.required],
        last_name: [this.data.last_name, Validators.required],
        status: [this.data.status, Validators.required]
      });
}

Any assistance or guidance on resolving this issue would be greatly appreciated. Thank you.

angular typescript

Answer 1

Answer №1

To ensure the form is populated correctly, it is important to create the form after retrieving data or initialize and then set values upon receiving the data. Here's an example of how you can build the form after fetching data:

ngOnInit() {
  this.sub = this.route.params.subscribe(params =>{
    this.id = params['id']; //console.log(this.id);
    this.apiService.getUserById(this.id).subscribe(values => {
      this.data = values[0];
      this.createForm();  // create form after fetching data
    }) 
  })
}

createForm(){
      this.userDetailForm = this.fb.group({
        id: [this.data.id],
        first_name: [this.data.first_name, Validators.required],
        last_name: [this.data.last_name, Validators.required],
        status: [this.data.status, Validators.required]
      });
}

Remember to use *ngIf in your template to prevent rendering the form before it is created, thus avoiding any errors in your app.

<form [formGroup]="userDetailForm" *ngIf="userDetailForm">

Answer 2

To ensure the form is populated correctly, it is important to create the form after retrieving data or initialize and then set values upon receiving the data. Here's an example of how you can build the form after fetching data:

ngOnInit() {
  this.sub = this.route.params.subscribe(params =>{
    this.id = params['id']; //console.log(this.id);
    this.apiService.getUserById(this.id).subscribe(values => {
      this.data = values[0];
      this.createForm();  // create form after fetching data
    }) 
  })
}

createForm(){
      this.userDetailForm = this.fb.group({
        id: [this.data.id],
        first_name: [this.data.first_name, Validators.required],
        last_name: [this.data.last_name, Validators.required],
        status: [this.data.status, Validators.required]
      });
}

Remember to use *ngIf in your template to prevent rendering the form before it is created, thus avoiding any errors in your app.

<form [formGroup]="userDetailForm" *ngIf="userDetailForm">

Answer 3

Answer №2

update your ngOnInit function

 ngOnInit() {

      this.sub = this.route.params.subscribe(params =>{
        this.userID = params['id']; //console.log(this.id);
        this.userService.fetchUserById(this.userID).subscribe(info => 
          this.userData = info[0];
          this.setupForm(this.userData);
         ) 
      })

modify your setupForm function as follows:

setupForm(userData){
      this.userProfileForm = this.fb.group({
        id: [userData.id],
        first_name: [userData.first_name, Validators.required],
        last_name: [userData.last_name, Validators.required],
        status: [userData.status, Validators.required]
      });
}

Answer 4

update your ngOnInit function

 ngOnInit() {

      this.sub = this.route.params.subscribe(params =>{
        this.userID = params['id']; //console.log(this.id);
        this.userService.fetchUserById(this.userID).subscribe(info => 
          this.userData = info[0];
          this.setupForm(this.userData);
         ) 
      })

modify your setupForm function as follows:

setupForm(userData){
      this.userProfileForm = this.fb.group({
        id: [userData.id],
        first_name: [userData.first_name, Validators.required],
        last_name: [userData.last_name, Validators.required],
        status: [userData.status, Validators.required]
      });
}

What is the best method for saving information from a service to a class or interface in Angular 2?

Answer №1

Answer №2

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