html - Validate date field -

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i trying disable save button untill date not picked. disabled not able enbale untill dont press key keyboard.please tell me doing wrong , in advance.

<div class = "form-group" ng-class="{ 'has-error' : form.fromtime.$invalid && !form.fromtime.$pristine }">     <label = "fromtime"> time:         <img src = "images/required.gif" alt = "required" class = "required-star">     </label>      <div class='input-group date' id='fromtime'  >         <input type='text' class="form-control" name="fromtime" ng-model = "fromtime" required />                     <span class="input-group-addon">                         <span class="glyphicon glyphicon-calendar"></span>                     </span>     </div>     <p ng-show="form.fromtime.$invalid && !form.fromtime.$pristine" class="help-block">from time required.</p> </div>  <button type="button" class="col-sm-2 btn btn-primary" ng-click="schedulecall()" style="margin-left:10px;" ng-disabled="form.$invalid"> save </button>

change:

ng-disabled="form.$invalid"

to:

ng-disabled="form.fromtime.$invalid"

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