jQuery(document).ready(function () {

var grid = $("#list");

    var AllCategory={"1":"Computing","2":"Cooking","10":"Fiction","3":"Finance","6":"Language","4":"Medical","11":"News","8":"Philosophy","9":"Religion","7":"Sport","5":"Travel"};


    grid.jqGrid({
        url: '/SupplierOrder/Select_SupplierOrderDetailByX/',
        editurl: "clientArray",
        datatype: 'json',
        mtype: 'GET',
        colNames: ['Category', 'Qty'],
        colModel: [
                      {
                          name: 'Category', index: 'CategoryID', align: 'left', editable: true, edittype: "select", formatter: 'select',
                          editoptions: { value: AllCategory }, editrules: { required: true }
                      },
                      { name: 'Qty', index: 'Qty', width: 40, align: 'left', editable: true, edittype: "text", editoptions: { size: "35", maxlength: "50"} }
                 ],
        pager: jQuery('#pager'),
        rowNum: 10,
        rowList: [5, 10, 20, 50],
        sortname: '',
        sortorder: '',
        viewrecords: true,
        autowidth: true,
        autoheight: true,
        imgpath: '/scripts/themes/black-tie/images',
        caption: 'Supplier Order Detail'
    })
    grid.jqGrid('navGrid', '#pager', { edit: false, add: false, del: true, refresh: false, search: false }, {}, {}, {}, {});
    grid.jqGrid('inlineNav', '#pager', {
        addtext: "Add",
        edittext: "Edit",
        savetext: "Save",
        canceltext: "Cancel"
    });

}); 

It is my JQGrid.

Then, I remove below code ...

var AllCategory={"1":"Computing","2":"Cooking","10":"Fiction","3":"Finance","6":"Language","4":"Medical","11":"News","8":"Philosophy","9":"Religion","7":"Sport","5":"Travel"};

Replace with below code so that i can get dynamic data ...

var AllCategory = (function () {
var list = null;

$.ajax({
async: false,
global: false,
type: "POST",
url: 'Category_Lookup',
dataType: 'json',
data: {},
success: function (response, textStatus, jqXHR) {
    list = response;
},
error: function (jqXHR, textStatus, errorThrown) {
    alert("jqXHR.responseText --> " + jqXHR.responseText + "\njqXHR --> " + jqXHR + "\ntextStatus --> " + textStatus + " \nerrorThrown --> " + errorThrown);
}
});
alert(list);

return list;
})();

Firstly, I get below message box ...

Then I get Error

Could anyone please tell me how to make it correct ? Every suggestion will be appreciated.