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Custom message for empty filter results

I have filtering options setup outside of the grid which a javascript file then feeds into .php file that compiles the xml.

Is it possible to setup a custom message if there are no results found? I would like to insert a "no results found" type of message underneath the headers. Currently what appears are the headers with no rows.

To detect if no rows was found you can use "onFilterEnd" event and getRowsNum() method;
mygrid.attachEvent("onFilterEnd",function(a,b,c){
  var num=mygrid.getRowsNum();

  if (!num) {document.getElementById("some_container").style.display="block";} // showing some container which will conatin message that no rows was found;

else document.getElementById("some_container").style.display="none";

  })

This did not work (I'm using the standard version).

What is the purpose of function(a,b,c)?  What is 'a,b,c'?

The event does not fire if I put in a test alert:

mygrid.attachEvent("onFilterEnd",function(a,b,c){
  alert("test");
  var num=mygrid.getRowsNum();
  if (!num) {document.getElementById("some_container").style.display="block";} // showing some container which will conatin message that no rows was found;
lse document.getElementById("some_container").style.display="none";
})

Please see example at the attachment