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gris multilineselection limitaion

hi
thanks very much for all your help.
and now i have an issue in my multiselect grid that when i select like 100 or more from my grid and trying to do some database work for it it goes too slow so i decided that i need to put limit on how many rows they can select let's say 20 ,
but i couldn't find this ability to do that.

so i change my way and i added an avent that count the selected rows and when it exceeds the imit it should deselect that row
but i couldn't find this method also,so can you help please ,it is urgent,
thanks

>>they can select let's say 20 ,
var flag = false;
mygrid.attachEvent("onSelectStateChanged",function(ids){
   if (flag) return;
   flag = true;
 
   ids = ids.split(",");
   if (ids.length > 20 ) {
       mygrid.clearSelection();
       for (var i=0; i<20; i++)
          mygrid.selectRowById(ids[i],true);
   }

  flag = false;
});

      mygrid.unsele
})

>>but i couldn't find this method also,so can you help please ,it is urgent,
There is no method to deselect specific rows, but it possible to clear all selection and select necessary rows only, as in sample above

thank you ,that 's really helped me