MVC3 Razor Page using jqGrid not rebinding - asp.net-mvc-3

Question

I have a jqGrid on a view page and it is loaded based on gathering data from a few select lists.
The first time through all is fine. If I change one of the select lists the .change function is triggered but the .jqGrid doesnt fire so the Controller method isnt hit.
My jqGrid code
$("#Builds").change(function () {
var programID = $("#ProgramID").val();
var buildID = $('#Builds').val();
$("#UpdateBuild").show();
// Set up the jquery grid
$("#jqTable").jqGrid({
// Ajax related configurations
url: '#Url.Action("_CustomBinding")',
datatype: "json",
mtype: "POST",
postData: {
programID: programID,
buildID: buildID
},
// Specify the column names
colNames: ["Assembly ID", "Assembly Name", "Cost", "Order", "Budget Report", "Partner Request", "Display"],
// Configure the columns
colModel: [
{ name: "AssemblyID", index: "AssemblyID", width: 40, align: "left", editable: false },
{ name: "AssemblyName", index: "AssemblyName", width: 100, align: "left", editable: false },
{ name: "AssemblyCost", index: "AssemblyCost", width: 40, align: "left", formatter: "currency", editable: true },
{ name: "AssemblyOrder", index: "AssemblyOrder", width: 30, align: "left", editable: true },
{ name: "AddToBudgetReport", index: "AddToBudgetReport", width: 40, align: "left", formatter: "checkbox", editable:true, edittype:'checkbox'},
{ name: "AddToPartnerRequest", index: "AddToPartnerRequest", width: 45, align: "left", formatter: "checkbox", editable:true, edittype:'checkbox'},
{ name: "Show", index: "Show", width: 20, align: "left", formatter: "checkbox", editable:true, edittype:'checkbox'}],
// Grid total width and height and formatting
width: 650,
height: 200,
altrows: true,
// Paging
toppager: true,
pager: $("#jqTablePager"),
rowNum: 10,
rowList: [10, 20, 30],
viewrecords: true, // Specify if "total number of records" is displayed
emptyrecords: 'No records to display',
// Default sorting
sortname: "AssemblyID",
sortorder: "asc",
// Grid caption
caption: "Build Template"
}).navGrid("#jqTablePager",
{ refresh: true, add: true, edit: true, del: true },
{}, // settings for edit
{}, // settings for add
{}, // settings for delete
{sopt: ["cn"]} // Search options. Some options can be set on column level
);
});
My controller Code:
[HttpPost]
public JsonResult _CustomBinding(string programID, string buildID, int page, int rows)
{
/* Variable Declarations */
BuildsRepository br = new BuildsRepository();
IEnumerable<ProgramsAssemblyBuilds> pab = br.GetProgramAssembliesBuilds(Convert.ToInt32(programID), Convert.ToInt32(buildID));
// Calculate the total number of pages
var totalRecords = pab.Count();
var totalPages = (int)Math.Ceiling((double)totalRecords / (double)rows);
var data = (from s in pab
select new
{
AssemblyID = s.AssemblyID,
cell = new object[] { s.AssemblyID, s.AssemblyName, s.AssemblyCost, s.AssemblyOrder, s.AddToBudgetReport, s.AddToPartnerRequest, s.Show}
}).ToArray();
var jsonData = new
{
total = totalPages,
page = page,
records = totalRecords,
rows = data.Skip((page - 1) * rows).Take(rows)
};
return Json(jsonData, JsonRequestBehavior.AllowGet);
}
Anyone have any ideas on this one?
Thanks

Answer 1

You should create the grid only once. So you should place the code
$("#jqTable").jqGrid({ ... });
outside of the change event handler.
To reload the grid you should use
$("#Builds").change(function () {
$("#jqTable").trigger("reloadGrid", [{page: 1}]);
$("#UpdateBuild").show();
});
At the end to have actual values from "#ProgramID" and '#Builds' you should use functions (methods) as the programID and buildID properties of postData:
// Set up the jquery grid
$("#jqTable").jqGrid({
// Ajax related configurations
url: '#Url.Action("_CustomBinding")',
datatype: "json",
mtype: "POST",
postData: {
programID: function() { return $("#ProgramID").val(); },
buildID: function() { return $('#Builds').val(); }
},
...
});
See more information here.