html - ng-maxlength $error message not showing -

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using ng-maxlength="80" in <input> field.

expected this: 

<span class="select2-container text-error resize" ng-show="myform.samplename.$error.maxlength">this can't longer 80 characters.</span>

to show if <input> field has more 80 characters.

however, error message not show. input field gets red border. nothing else.

here part of form:

 <form name="myform" class="form-horizontal" ng-show = "isformactive()" novalidate>     <div class="control-group">               <label class="control-label buffer-right"><h5>name:</h5></label>                <div class="input-prepend buffer-left">                 <span class="add-on"><i class="icon-pencil"></i></span>                 <input type="text" name="samplename" ng-model="person.name" ng-minlength="1" ng-maxlength="80" placeholder="enter comments here" required /></br>                 <span class="select2-container text-error resize" ng-show="myform.samplename.$error.maxlength">                   can't longer 80 characters.</span>               </div>     </div> </form>


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