Ladda is a JavaScript library for ...

$("#btnSearch").click(function (e) {
        e.preventDefault();
       // create a new instance of Ladda
        var l = Ladda.create(document.querySelector("#btnSearch"));
        l.start();
        $('#lifeGrid').data('kendoGrid').dataSource.read();
        $('#lifeGrid').data('kendoGrid').refresh();
 });  
 $("#lifeGrid").kendoGrid({
        dataSource: {
            requestStart: function () {
            },
            requestEnd: function () {
                // get the instance of Ladda
                var l = Ladda.create(document.querySelector("#btnSearch"));
                // check if it is still loading
              if (l.isLoading) {
                    l.stop();
                }
            },  
  ...