I am facing an issue where the data is not being populated in my form even though I am using ng

Here is a form with grouped inputs using the ngModelGroup directive:

<form #form="ngForm" (ngSubmit)="submit(form.value)">
    <fieldset ngModelGroup="user">
        <div>
            <label>Firstname:</label>
            <input type="text" name="firstname" [(ngModel)]="firstname">
        </div>
        <div>
            <label>Lastname:</label>
            <input type="text" name="lastname" [(ngModel)]="lastname">
        </div>
    </fieldset>
    <fieldset ngModelGroup="address">
        <div>
            <label>Street:</label>
            <input type="text" name="street" [(ngModel)]="street">
        </div>
        <div>
            <label>Zip:</label>
            <input type="text" name="zip" [(ngModel)]="zip">
        </div>
        <div>
            <label>City:</label>
            <input type="text" name="city" [(ngModel)]="city">
        </div>
    </fieldset>

    <button type="submit">Submit</button>
</form>

Is it necessary to use ngModelGroup when mapping [(ngModel)] to nested objects like user.firstname or user.lastname? This approach may raise questions about the need for ngModelGroup altogether.

Can you provide clarity on how to effectively utilize ngModelGroup for nested objects?

Check out the Plunker for reference: https://plnkr.co/edit/Y4bjFh6sjtvdzkUWciid?p=preview

Answer №1

ngModelGroup allows you to organize the data collected from a form by creating "subproperties".

When using ngModelGroup="user" in your template, the structure of form.value will be like this:

{
  "user": {
    "firstname": "foo",
    "lastname": "bar"
  },
  // ...
}

If you do not use ngModelGroup="user" in your template, the structure of form.value will be:

{
  "firstname": "foo",
  "lastname": "bar",
  // ...
}

ngModelGroup can be beneficial in aligning the form data with your data models. However, it does not affect the properties bound to [(ngModel)] (these properties can be named as you wish).

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