Jqgrid Export to Excel

[iamarshad]

I am using Jqgrid 4.4 version for my codeigniter website. I have been trying to export the Jqgrid values to excel, When i Use this function

("#export").on("click", function(){
grid.jqGrid("excelExport",{
includeLabels : true,
includeGroupHeader : true,
includeFooter: true,
fileName : "ship-to-attention.xlsx",
maxlength : 40 // maxlength for visible string data
})
})

It shows an error in console stating that
uncaught type error: cannot read property 'indexOf' null

excelExport : function(o) {
o = $.extend({
exptype : "remote",
url : null,
oper: "oper",
tag: "excel",
exportOptions : {}
}, o || {});
return this.each(function(){
if(!this.grid) { return;}
var url;
if(o.exptype == "remote") {
var pdata = $.extend({},this.p.postData);
pdata[o.oper] = o.tag;
var params = jQuery.param(pdata);
if(o.url.indexOf("?") != -1) { url = o.url+"&"+params; }****//

Here on the above line.

                else { url = o.url+"?"+params; }
                window.location = url;
            }
        });
    }
});

Do anyone know about this, Anyone who can solve this