Input elements returning value as undefined while submitting the form

I am trying to submit the auto selected or user selected value. While submitting the form, input elements are returning value as undefined.

I have tried binding the values in multiple ways as suggested on different sites but nothing helped.

HTML code

<div ng-switch-when="textinput" class="form-group">
              <label class="control-label col-xs-3" for="textInput"><b>:</b></label>
              <div class="col-xs-9">
                <input type="text" class="form-control" id="textInput" pattern="tag.validation" ng-required="tag.required" ng-readonly="!tag.editable" ng-model="inputText" ng-init="inputText=tag.autofill" />
              </div>
            </div

JS code

$scope.submitForm = function() {
    $scope.formMain = true;
    $scope.footerMessage = false;
    $scope.getError="";
    $scope.error="";
    alert($scope.textBox);
  };

Please help on this. Link to Plunkr

Thank you in advance.