在Grid上增加键盘监听事件
1 首先定义gridview id

onListsgridviewItemKeydown: function(dataview, record, item, index, e, eOpts) {        var key = e.getKey();        var store = record.store;        if(key>=e.A && key<=e.Z){            var initial = String.fromCharCode(key);            var localIndex = index;            do{                localIndex++;                record = store.getAt(localIndex);            }while(record && record.get('name').indexOf(initial.toLowerCase()) !== 0 && localIndex<=store.data.length-1);            if(record && record.get('name').indexOf(initial.toLowerCase()) === 0 && localIndex<=store.data.length-1){                dataview.select(localIndex);            }        }        return false;    },

用户在表格里面按键后可以定位到具体的行（首字母为按键字母）