grid.addListener('cellclick', cellclick);
function cellclick(grid, rowIndex, columnIndex, e) {
var record = grid.getStore().getAt(rowIndex);
var fieldName = grid.getColumnModel().getDataIndex(columnIndex);
var data = record.get(fieldName);
if(data==null){ //處理預覽
var alias=record.get("Alias");
window.open(url);
//window.location.href="DoIpcammera?dowith=preview&&alias="+alias;
}
}