Compare Old and New Values After Grid Refresh

[Matt]

I have a Grid instance that is being refreshed every X seconds and would like to compare the new data (remote) with the existing data, which then affect how the data is displayed within the grid.  I have looked through the documentation and the forums but can't seem to find a way to compare the two.  The "change" config seems to be for only inline editing... but maybe I am wrong.  Any help/links would be appreciated.  Here is an example of what is going on here (I would like to compare the values returned for "rate" and "high_rate"):

// KendoUI grid

var kgrid = $("#rate_grid").kendoGrid({

  dataSource: {

    data: get_rates(),

    pageSize: 100

  },

  height: 360,

  groupable: false,

  scrollable: {

    virtual: true

  },

  sortable: true,

  pageable: false,

  columns: [ {

    field: "rate_name",

    width: '65px',

    title: "Name"

  } , {

    field: "rate",

    title: "Rate"

  } , {

    field: "high_rate",

    title: "High"

  }],

  rowTemplate: kendo.template($("#rowTemplate").html()),

  dataBound: onDataBound

});

 

setInterval( function() {

  // if KendoUI grid instance, update it

  if (typeof kgrid !== "undefined")

  {

    $('#rates_load small').text();

    var re_grid = $("#rate_grid").data("kendoGrid");

    var new_grid_data = get_rates();

    re_grid.dataSource.data(new_grid_data);

    re_grid.refresh();         

  }

}, 5000);

[Vivek]

Have you tried using a separate dataSource and then using the data() event? You can then query the dataSource, grab the old data and then refresh and compare results.

[Matt]

@Vivek, thanks for the idea.  I feel like I'm not utilizing the inherit power of the DOM and Kendo's Grid this way but it's worth giving a shot.  I'm using the datasource: data: function() to update a "current" javascript global variable and the "new" javascript global variable, then have the dataBound callback compare them and dynamically modify the GUI as needed.  I feel like this is a bit of a round-about approach, but I'll let you know how it goes.