<div>
    <ng-form name="prevalueRequiredFieldForm">
        <input name="requiredfield" type="text" class="umb-property-editor umb-textstring"
               ng-model="model.value"
               required />

        <span ng-messages="prevalueRequiredFieldForm.requiredfield.$error" show-validation-on-submit >
            <span class="help-inline" ng-message="required">Required</span>
        </span>
        
    </ng-form>    
</div>
