Kendo Context Menu's disabled menu's are getting enabled after page postback - Asp.Net [ Web Forms ]

[Aravindan]

I have disabled Add and Delete always .. But after postback of the page . The options are automatically enabled on rightclick

 

This is my code : 

 

function detailInitKendoCostGrid(e) {
    if (e.data.Id > 0) {
        var ds = new kendo.data.DataSource({
            schema: {
                id: "jobCodeID",
                data: "d",
                total: "d.length",
                model: {
                    fields: {
                        Cost: { type: "string" },
                        Total: { type: "string" },
                        Desc: { type: "string" },
                        Quantity: { type: "string" },
                  }
                }
            },
            pageSize: 500,
            transport: {
                read: {
                    url: "Cost.aspx/CostPart",
                    contentType: "application/json; charset=utf-8",
                    dataType: 'JSON',
                    type: "POST",
                    complete: function (jqXhr, textStatus) {
                        if (textStatus === 'error') {
                            var message = $.parseJSON(jqXhr.responseText).Message;
                            ShowMessageDialog(message);
                        }
                    }
                },
                parameterMap: function (options, operation) {
                    // ////
                    switch (operation) {
                        case "read":
                            return JSON.stringify({
                                "jobcodeId": e.data.Id,
                            });
                            break;
                        default:
                            return JSON.stringify(options);
                            break;
                    }
                }
            }
        });
        $("<div style='height: 400px'/>").appendTo(e.detailCell).kendoGrid({
            dataSource: ds,
            columns: [
                { field: "Cost", title: "Task", width: "500px" },
                { field: "Total", title: " Part Number", width: "100px" },
                { field: "Desc", title: "Part Description", width: "100px" },
                { field: "Quantity", title: "Quantity", width: "100px" },
               
            ],
              selectable: true
        });
    }
}
function SetContextMenuforCost()
{
    var taskPartGridId = "#Kendo_CostGrid";
    $("#E_ContextMenu").kendoContextMenu({
        dataSource: [{ text: "Add Cost" },
                     { text: "Edit Cost" },
                      { text: "Delete Cost" }],
        target: CostGridId,
        filter: ".k-detail-row tbody tr.k-state-selected[role='row']",
        open: function (e) {
            showopen(e);
        },
        select: function (e) {
            ShowGridPopup(e);
        },
    });
      $("#E_ContextMenu").kendoMenu().data("kendoMenu").enable("li:eq(1)", true);
            $("#E_ContextMenu").kendoMenu().data("kendoMenu").enable("li:eq(0)", false);
            $("#E_ContextMenu").kendoMenu().data("kendoMenu").enable("li:eq(2)", false);
}
function showopen(e) {
    var menu = e.sender;
    if (menu != null) {
        var total= e.target.childNodes[3].textContent;
           if (quantity > 0) {
            $("#E_ContextMenu").kendoMenu().data("kendoMenu").enable("li:eq(1)", true);
            $("#E_ContextMenu").kendoMenu().data("kendoMenu").enable("li:eq(0)", false);
            $("#E_ContextMenu").kendoMenu().data("kendoMenu").enable("li:eq(2)", false);
        }
    }
}

[Ivan Danchev]

Hello Aravindan,

Your code is not runnable, so I attached a sample runnable page that simulates your scenario. The code in the showopen function is commented because it is not clear where the "quantity" variable is defined and what are its expected values.
At my end selecting a row then right-clicking on it shows the Add and Delete items disabled. Above the Grid there is a button that initiates postback on click. After the postback the ContextMenu items are still disabled. Could you modify the page accordingly so that the issue is reproduced and attach it back for further review?

Regards,
Ivan Danchev
Telerik by Progress