Angular Form Validation $invalid not working -


i trying disable submit button, when fields empty. not working. don't know why not working. saw many blogs, could't figure whats issue.

<form name="createform">      <div class="form-group col-md-6">       <label for="createname">student</label>       <select class="form-control" name="student" id="createname" ng-       model="createstudent.studentid" ng-options="item.name item in         allstudent"  required>       <option value="" selected disabled>select</option>     </select>   </div>   <div class="form-group col-md-6">     <label for="createclass">class</label>     <select class="form-control" name="class" id="createclass" ng-      model="createstudent.classid" ng-options="item.number item in       allclass"  required>       <option value="" selected disabled>select</option>     </select>   </div> </div>   <div class="form-group col-md-6 text-md-center">     <label for="createcategory">type of category</label>     <select class="form-control" name="category" id="createcategory"       ng-model="createstudent.type" ng-options="item.category_type        item in allcategoriestypes" required>       <option value="" selected disabled>select</option>     </select>   </div> </div> <div class="row align-items-end justify-content-center">   <div class="form-group col-md-6 text-md-center">     <label for="createteachername">teacher name</label>     <input type="text" class="form-control" name="teacher"       id="createteachername" ng-model="createstudent.name"       placeholder="enter teacher name" required>   </div> </div> </div> <div class="text-center pt-1"> <button type="submit" class="btn btn-info px-5" ng-   click="create(createstudent)" ng-   disabled="createform.$invalid">save</button> </div> </form>

please find working plunker code :

http://plnkr.co/edit/h1loahfnwrxyhwtvmrcw?p=preview

 <form name="createform">      <div class="form-group col-md-6">       <label for="createname">student</label>       <select class="form-control" name="student" id="createname" ng-       model="createstudent.studentid"  required>        <option value="studentvalue">student name</option>     </select>   </div><br/>   <div class="form-group col-md-6">     <label for="createclass">class</label>     <select class="form-control" name="class" id="createclass" ng-      model="createstudent.classid"  required>        <option value="classvalue">class</option>     </select>   </div><br/>   <div class="form-group col-md-6 text-md-center">     <label for="createcategory">type of category</label>     <select class="form-control" name="category" id="createcategory"       ng-model="createstudent.type" required>       <option value="typevalue">category</option>     </select>   </div><br/> <div class="row align-items-end justify-content-center">   <div class="form-group col-md-6 text-md-center">     <label for="createteachername">teacher name</label>     <input type="text" class="form-control" name="teacher"       id="createteachername" ng-model="createstudent.name"       placeholder="enter teacher name" required>   </div> </div><br/> <div class="text-center pt-1"> <label>value returned $invalid :: {{createform.$invalid}}</label><br/><br/> <button type="submit" class="btn btn-info px-5" ng-click="create(createstudent)" ng-disabled="createform.$invalid">save</button> </div> </form>

make sure tags closed , none of fields empty.


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