Angular dynamic forms created with JSON data - json

Question

Dear reader. I am trying to make dynamic forms with Json data that has been red. The dynamic form is based on the example of Angular as seen here: https://angular.io/guide/dynamic-form
The edits I made are that I read data from an external Json file and try to load those instead of the hardcoded one in the file 'question.service.ts' as seen in the link.
This is how my Json file looks like:
{
"formInfo": {
"name": "test"
},
"fields": [
{
"controlType": "textbox",
"key": "firstName",
"label": "Voornaam",
"required": true,
"value": "Mark",
"order": 1
},
{
"controlType": "textbox",
"key": "surName",
"label": "Achternaam",
"required": true,
"order": 2
},
{
"controlType": "textbox",
"key": "emailAddress",
"label": "Email",
"required": false,
"order": 3
},
{
"controlType": "dropdown",
"key": "brave",
"label": "Beoordeling",
"required": "",
"order": 4,
"options": {
"solid": "Solid",
"great": "Great",
"good": "Good",
"unproven": "Unproven"
}
}
]
}
And my function to retrieve the data and return as observable (in question.service.ts) looks like:
getQuestions2() : Observable<QuestionBase<any>[]> {
let questions: QuestionBase<any>[] = [];
const exampleObservable = new Observable<QuestionBase<any>[]>((observer) =>
{
let url = "../assets/exampleData.json"
this.http.get(url).subscribe((data) => {
for (let x of data['fields']){
if (x.controlType == "textbox"){
let textboxItem = new TextboxQuestion({
key: x.key,
label: x.label,
value: x.value,
order: x.order
})
questions.push(textboxItem);
}
else if (x.controlType == "dropdown"){
let dropDownItem = new DropdownQuestion({
key: x.key,
label: x.label,
value: x.value,
options: x.options,
order: x.order
})
questions.push(dropDownItem);
}
}
})
observer.next(questions.sort((a, b) => a.order - b.order));
})
return exampleObservable;
}
and the code that connects the service with the frontend looks like this:
export class AppComponent implements OnInit {
questions: any[];
constructor(private service: QuestionService) {
this.getaSyncData();
//this.questions = this.service.getQuestions();
//console.log(this.questions);
}
getaSyncData(){
this.service.getQuestions2()
.subscribe((data) => this.questions = data);
console.log(this.questions);
}

Answer 1

I solved this finally for those who will have similar issues in the future
I was not able to load forms into the html even though I was correctly reading the data out of the JSON file and printing it in the console. I added a *ngIf in the div where you load in your data. In the example of Angular.io its in the template on App.component.html. Yes, it was this simple.