function _onFormValidate(aErrors){
            _clearPopovers();

            // to avoid bootstrap bug
            if (aErrors.length <= 0) {
                return _clearPopovers();
            }

            var welTarget;
            aErrors.forEach(function(htError){
                welTarget = htElement.welFormPswd.find("input[name=" + htError.name + "]");

                if(welTarget){
                    _showPopover(welTarget, htError.message);
                }
            });
        }
on validate form

@param {Array} aErrors