javascript - $myform.textinput.$isvalid is true when it should not -

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the whole form should not valid until stuff[] has @ least 1 item added it. when user enters in value text box , clicks add adds value stuff[], @ point when value has been added stuff[] should submit button enabled. however, user types text box without clicking add, , nothing in stuff[], makes form valid , enables submit button. 

<form ng-app="myapp" ng-controller="myctrl" name="myform" ng-submit="submit()" novalidate>     <div ng-repeat="things in stuff">         <table><tr><td>{{things}}</td></tr></table>     </div>      <input type="text" name="app" ng-model="input" ng-required="!stuff[0]" />      <button ng-disabled="!input" ng-click="add()">         <span> add</span>     </button>      <input type="submit" value="submit" ng-disabled="myform.$invalid" />      <script>         angular.module('myapp', []).controller('myctrl', function ($scope) {             $scope.stuff = [];             $scope.input = null;              $scope.add = function () {                 var l = $scope.stuff.length;                 $scope.stuff[l] = $scope.input;                               $scope.input = null;              };             $scope.submit = function () {};                     });     </script> </form>

[edit] answer question directly: !stuff[0] true when there nothing in array, , false otherwise. when true, input required, making form 'initially' invalid. type input, requirement fulfilled, meaning form valid, , can click submit button. condition has nothing putting array.

this fixable attaching condition stuff.length proposed answer below. won't make form invalid (which can condition elsewhere) @ least disable submit button. [/edit]

i don't understand why have ng-required there, wanting disable submit button, meaning logic should attached submit button, not input text box.

i instead:

<input type="text" name="app" ng-model="input"/>  <button ng-disabled="!input" ng-click="add()">     <span> add</span> </button>  <input type="submit" value="submit" ng-disabled="stuff.length == 0" />

which disable submit button if there nothing in stuff.


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