>>Hi everybody,
>>
>>I have the following drop down
>>
>>

>><select class="form-control-inline"
>>                        ng-model="currentMatrixTemplate.rowAttributeId"
>>                        required
>>                        ng-change="changeAttribute('row', currentMatrixTemplate.rowAttributeId, {{currentMatrixTemplate.rowAttributeId}})"
>>                        ng-options="attribute.value as attribute.text for attribute in metaData.attributes |filter: { value: '!' + currentMatrixTemplate.columnAttributeId }">
>>                    <option value="" disabled>        @String.Format(Labels.selectX, Labels.attribute)...</option>
>>                </select>

>>
>>I want to make sure that user selected a value which will be a number greater than 0. I don't want the Add button to become enabled until it's done.
>>
>>I can, of course, make all the necessary checks in the Add button's code, but wondering if it somehow possible to treat 0 as 'empty' for required?
>>
>>
>>Thanks in advance.
>
>Not sure I understand but why not filter out the '0' option from the ng-options in the first place ? Failing that then you could use a custom validator,

There is no 0 option in the list. However, when the form starts in the new mode, the initial values are 0. I think that problem is not too important, I'll just add a check in the Add method.