function _onClickLabelOnList(weEvt) {
            weEvt.preventDefault();

            var link = $(this);
            var targetQuery = "[data-search=labelIds]";
            var target = htElement.welForm.find(targetQuery);

            var labelId = link.data("labelId");
            var newValue;

            if(target.prop("multiple")){
                newValue = (target.val() || []);
                newValue.push(labelId);
            } else {
                newValue = labelId;
            }

            target.data("select2").val(newValue, true); // triggerChange=true
            console.log("labelId", labelId);
        }
"click" event handler of labels on the list.
Add clicked label to search form condition.

@param event
@private