function _onKeyInput(eEvt){
        eEvt = eEvt || window.event;

        var charCode = eEvt.which || eEvt.keyCode;
        if(charCode === 64 || charCode === 35 || charCode === 58) { // 64 = @, 35 = #, 58 = :
            if(htVar.doesNotDataLoaded) {
                _findMentionList();
            }
        }
    }
Event handler on KeyInput event

@param {Event} eEvt