I am trying to create a page which users can use to create custom forms. I will be giving the user a drop-down menu. From that drop-down menu, user will be able to select the type of question - like text box, radio button, check box, date and etc. - and then based on that selection, I want to add that type of input into my DOM form. On submit, I want to store the value of these questions in JSON format.
Any suggestions? What is best approach to tackle this or how I can implement it?
You don't need any package, the best way to do this is like this:
<div ngbDropdown class="nav-item dropdown cursor">
<a class="nav-link" ngbDropdownToggle>
DropDown
</a>
<div ngbDropdownMenu class="dropdown-menu">
<a class="dropdown-item" (click)="option1 = !option1">
Form 1
</a>
<a class="dropdown-item" (click)="option2 = !option2">
Form 2
</a>
</div>
</div>
<form #form="ngForm">
<div class="form-option1" *ngIf="option1Selected">
<!-- YOUR FORM 1 -->
</div>
<div class="form-option2" *ngIf="option2Selected">
<!-- YOUR FORM 2 -->
</div>
...
<button type="submit"></button>
</form>
And them in your component:
option1 = "false";
option2 = "false";
The doc of *ngIf is here
Have a look at ng-dynamic-forms. I've used it on a project before and it really helped creating forms dynamically.
It even provides an import / export functionality which you could use to store the form/questions including the provided answers in JSON format.
sidenote: I am in no way connected to the mentioned project.
EDIT: I feel an example like in this stackblitz shows how much control you have in terms of dynamic forms with the basic Angular utilities.
https://stackblitz.com/edit/deep-nested-reactive-form?file=app%2Fapp.component.html
Reactive Forms are your answer. There is no perfect way to do what you want. But I picked out a particular piece of an example from an old project. So, on one point I check for the type of comparators I have available due to my first choice. After that I check if I need a field that requires a simple input field or a datepicker. There are SO many ways to do this.
<div class="col-7">
<!-- Text Input Field for most cases that don't involve time comparisons -->
<div *ngIf="!doesRequireDateInput(i) && checkIfComparatorOptionIsEmptyOrNull(i)">
<div class="string-input-field" formArrayName="values">
<div [formGroupName]="j" *ngFor="let val of getValues(condition); let j = index">
<div class="input-group">
<input formControlName="value" type="text" class="form-control py-0" placeholder="Search for...">
</div>
</div>
</div>
</div>
<!-- Date Input Field -->
<div *ngIf="doesRequireDateInput(i) && checkIfComparatorOptionIsEmptyOrNull(i)">
<div class="string-input-field row" formArrayName="values">
<div [formGroupName]="j" *ngFor="let val of getValues(condition); let j = index">
<div *ngIf="j === 0" class="input-group mb-3">
<input type="text" formControlName="value" name="dateFrom" class="form-control py-0" style="text-align: center" [owlDateTimeTrigger]="dt3"
[owlDateTime]="dt3">
<owl-date-time [pickerType]="'calendar'" #dt3></owl-date-time>
<div class="input-group-append">
<span class="input-group-text" style="border-bottom-right-radius: 0px; border-top-right-radius: 0px" id="date-for-input">
<i class="fa fa-calendar" aria-hidden="true"></i>
</span>
</div>
</div>
<div *ngIf="j === 1" class="input-group mb-3">
<input type="text" formControlName="value" name="dateFrom" class="form-control py-0" style="text-align: center" [owlDateTimeTrigger]="dt3"
[owlDateTime]="dt3">
<owl-date-time [pickerType]="'calendar'" #dt3></owl-date-time>
</div>
</div>
</div>
</div>
</div>
