I have this select which i need the default value to be empty, tried adding a option with value="?" and selected="selected" but it wont work, any ideas?
<select class="form-control"
id="Select7"
name="grossweightmeasurementunitcode"
ng-model="itemForm.grossweightmeasurementunitcode"
ng-required="true">
<option ng-repeat="unidadepeso in unidadespeso" value="{{unidadepeso.commoncode}}">{{unidadepeso.sigla}}</option>
</select>