getSelected Returns: string
Return the id of the selected record. If the multiple selection method is one this method is going to return only the id of the first selected record.
Examples
  
  <button id="btnShowSelection">Show Selection</button>
 <br/><br/>
 <table id="grid"></table>
 <script>
     var grid = $("#grid").grid({
         dataSource: "../Grid/GetPlayers",
         columns: [ { field: "ID" }, { field: "Name" }, { field: "PlaceOfBirth" } ],
         selectionMethod: "checkbox"
     });
     $("#btnShowSelection").on("click", function () {
         alert(grid.getSelected());
     });
 </script>