AngularJS - How to trigger submit in a nested form - forms

Question

I'm building a form that generates an invitation when submitted. The invitation has several fields, one of which is an email address input with an 'add' button, which when clicked should add that address to a list of email addresses that should receive the invite.
This can be done with a single form, however if the user hits the enter key while typing an email then it triggers submit on the whole form. I'd like to have the enter key result - when the email input field is focused - have the same effect as clicking the 'add' button. I expected that the proper way to solve this would be to nest an email entry form within the invitation form, something like this:
<ng-form ng-submit="sendInvite()">
<input type="text" placeholder="Title" ng-model="invitation.title"/>
<ng-form ng-submit="addInvitee()">
<input type="email" placeholder="Title" ng-model="inviteeEmail"/>
<button class="btn" type="submit">add</button>
</ng-form>
<button class="btn" type="submit">Send</button>
</ng-form>
With the following javascript in the controller:
$scope.addInvitee = function() {
$scope.invitation.emails.push($scope.inviteeEmail);
$scope.inviteeEmail = '';
}
$scope.sendInvite = function() {
//code to send out the invitation
}
My problem is that having nested the forms (and in doing so converted from <form> to <ng-form>, submitting either one no longer works.
Plunker here

Answer 1

I've similar requirement - wizard driven multi-step form. When user clicks 'Next' button, I've to validate the current step form.
We can trigger validation by firing '$validate' event on the scope bound to the form.
isFormValid = function($scope, ngForm) {
$scope.$broadcast('$validate');
if(! ngForm.$invalid) {
return true;
}
}
When ever I want to check if the form values are correct, I'll call isFormValid with the scope & form instance.
Working code: Plunker link
It is also useful to have few additional logic in isFormValid (included in the above Plunker) which makes the form & form fields $dirty as we would be showing/hiding validation messages based on their $dirty state.

Answer 2

You can use one of the following two ways to specify what javascript method should be called when a form is submitted:
* ngSubmit directive on the form element
* ngClick directive on the first button or input field of type submit (input[type=submit])
-- form docs
<ng-form>
<input type="text" placeholder="Title" ng-model="invitation.title"><br>
<ng-form>
<input type="email" placeholder="Title" ng-model="inviteeEmail">
<button class="btn" ng-click="addInvitee()">add</button><br>
</ng-form>
<ul class="unstyled">
<li ng-repeat="invitee in invitation.invitees">
<span>{{invitee.email}}</span>
</li>
</ul>
<button class="btn" ng-click="sendInvite()">Send</button>
</ng-form>
Plunker

Answer 3

When the form is submitted, you can find all nested forms using some thing like below
forms = []
forms.push(form)
nestedForms = _.filter(_.values(form), (input) -> (input instanceof form.constructor) and (input not in forms))
Here, form is the outer form controller which was submitted. You can hook this code on ur onsubmit, and find all nested forms and do whatever you have to.
Note: This is coffeescript