How to get the values of multiple checkboxes in Angular 8 - html

Question

I am trying to get the values of the checkboxes that are selected. I have the following code:
<div style="background-color:lightblue;" >
<div class="content">
<label class="label">Province</label>
<div class="form-check form-check-inline" *ngFor = "let province of utilities.Provinces; let i of index">
<label class="form-check-label" for="inlineCheckbox1" >{{province}}</label>
<input class="form-check-input" [formControl]= "province" (change)="getSelectedProvinces()" type="checkbox" id="inlineCheckbox{{i}}" value="option1">
</div>
</div>
In .ts I have the following
import { Component, OnInit } from '#angular/core';
import { UtilitiesService } from '../_services/utilities.service';
import { Utilities } from '../models/utilities';
import { forEach } from '#angular/router/src/utils/collection';
#Component({
selector: 'app-filtering',
templateUrl: './filtering.component.html',
styleUrls: ['./filtering.component.css']
})
export class FilteringComponent implements OnInit {
utilities: Utilities;
provinces: string[] = [];
selectedProvinces: string[] = [];
selectedCategories: string[] = [];
constructor(private utilityService: UtilitiesService) { }
ngOnInit() {
this.loadUtilities();
}
loadUtilities() {
this.utilityService.getJSON().subscribe((utilities: Utilities) => {
this.utilities = utilities;
});
for (const province of this.utilities.Provinces) {
this.provinces.push(province);
}
}
getSelectedProvinces() {
this.selectedProvinces = [];
this.utilities.Provinces.forEach((_province, i) => {
if (_province.value) {
this.selectedProvinces.push(this.provinces[i]);
}
});
console.log(this.selectedProvinces);
}
}
In my utilities.ts I have the following:
export interface Utilities {
Provinces: Array<string>;
}
My service is written as follows:
import { Injectable } from '#angular/core';
import { HttpClient } from '#angular/common/http';
import { Utilities } from '../models/utilities';
import { Observable } from 'rxjs';
#Injectable({
providedIn: 'root'
})
export class UtilitiesService {
constructor(private http: HttpClient) {}
public getJSON(): Observable<Utilities> {
return this.http.get<Utilities>('./assets/utilities.json');
}
}
The Json that is has the following content:
{
"Provinces":["East","North West","North"]
}
When I try that, I have the following error:
TypeError: Cannot read property 'Provinces' of undefined.
The thing is, when I remove [formControl]= "province" (change)="getSelectedProvinces()", at least I am able to display the provinces on my page.
How can I go about this?

Answer 1

I finally solved my problem using this code below:
<div class="content">
<label class="label">Province</label>
<div class="form-check form-check-inline" *ngFor="let province of utilities.Provinces">
<label class="form-check-label" for="{{province}}">{{province}}</label>
<input class="form-check-input" (change)="onChangeCategory(province, $event.target.checked)"name="{{ province}}" type="checkbox" id="{{province}}">
</div>
In my .ts, I have the following:
onChangeProvince(province: string, isChecked: boolean) {
if (isChecked) {
this.selectedProvinces.push(province);
} else {
const index = this.selectedProvinces.indexOf(province);
this.selectedProvinces.splice(index, 1);
}
console.log(this.selectedProvinces);
}