Using checkboxes and required with AngularJS

If you want the submit button disabled if no choice is selected the easiest way is to check the length of the array in the ng-disabled attribute, without setting the required attribute

<input type="submit" value="Send" ng-click="submitSurvey(survey)" 
 ng-disabled="value.length==0" />

See here for updated fiddle

Another way to do this would be to check the array length in the ng-required attribute of the checkboxes

<input type="checkbox" value="{{choice.id}}" ng-click="updateQuestionValue(choice)"
  ng-model="choice.checked" name="group-one" id="{{choice.id}}" 
  ng-required="value.length==0" />

Second fiddle