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var gridId  = "clientList"; //set to the ID of the grid
var fieldId = "lastName";  //set to the ID of the field in grid

//set click event handler when the DynaForm loads for any existing rows in the grid:
var nRows = $("#"+gridId).getNumberRows();

for (var i = 1; i <= nRows; i++) { 
  $("#\\["+gridId+"\\]\\["+i+"\\]\\["+fieldId+"\\]").click(clickHandler);
}

//set click event handler when a new row is added:
$("#"+gridId).onAddRow(function(aNewRow, oGrid, rowIndex) {
  $("#\\["+gridId+"\\]\\["+rowIndex+"\\]\\["+fieldId+"\\]").click(clickHandler);  
});

//click event handler function to display an alert if the field is left empty:
function clickHandler() {
  var rowNo = $(this).prop("id").match(/\]\[(\d+)\]\[/)[1]
  var val = $(this).find("input.form-control").val();
  if (val == '') {     
     alert("Row "+rowNo+" needs to be filled.");
  }
}