Ng-submit doesn't work when enter key is pressed from focused input

For some reason, when I press the enter button after hiding the input, the function submit_form()

doesn't fire. Anyone have any ideas as to why this won't work?

<form name="theform" ng-submit="submit_form()" novalidate>

        <div ng-hide="show_form">
            <div ng-click="show_input()">Click me</div>
        </div>

        <div ng-show="show_form">
            <input type="text" class="md_input" ng-model="inputstuff" placeholder="name" required />   
        </div>

</form>

      

        
        
        
      

    

Internal controller:

$scope.show_form = false;
$scope.show_input = function() { $scope.show_form = true; }
$scope.submit_form = function() { console.log("TRIGGER"); }