1. Put the additional message to the returning row, such as:
{
"name":"myname","language":"en","msg":"other message"
}
2. Retrieve this message in 'onSave' event that will be triggered after saving a row.
$('#dg').edatagrid({
onSave:function(index,row){
if (row.msg){
alert(row.msg)
}
}
});