How to reload a jqGrid with new query string value - jqgrid

Question

I load jqgrid with drop down values using onchange event.
But when i again choose some other value in drop down i need the jqgrid to show the corresponding values.
Here s how i load the jqgrid
function getGrid() {
var mOptometrist = $('#optOptometristList').val();// Drop down value
alert(mOptometrist);
//jQuery("#list").jqGrid().setGridParam({ url: 'Schedule.ashx?mOptometristId=' + mOptometrist + '' }).trigger("reloadGrid");
jQuery("#jQGridDemo").jqGrid({
url: 'Schedule.ashx?mOptometristId=' + mOptometrist + '',
datatype: "json",
colNames: ['Id', 'Day', 'Start Time', 'End Time', 'Interval', 'Session', "Patient", 'Slots', 'Room Number'],
colModel: [
{ name: 'SlNo', index: '_id', width: 20, stype: 'text', editable: true, editoptions: { disabled: true} },
{ name: 'DayOfWeek', index: 'Day', width: 150, stype: 'text', sortable: true, editable: true, edittype: "select", formatter: 'select', editoptions: { value: getAllSelectOptions()} },
{ name: 'StartTime', index: 'StartTime', width: 150, editable: true, formatter: 'date', formatoptions: { srcformat: 'u', newformat: 'H:i:s'} },
{ name: 'EndTime', index: 'EndTime', width: 60, editable: true, formatter: 'date', formatoptions: { srcformat: 'u', newformat: 'H:i:s'} },
{ name: 'Interval', index: 'Interval', width: 80, align: "right", editable: true },
{ name: 'Session', index: 'Session', width: 40, align: "right", editable: true },
{ name: 'PatientsPerSlot', index: 'Patient', width: 80, align: "right", editable: true },
{ name: 'Slots', index: 'Slots', width: 150, sortable: false, editable: true },
{ name: 'RoomID', index: 'RoomNumber', width: 100, sortable: false, editable: true }
],
rowNum: 10,
mtype: 'GET',
loadonce: false,
rowList: [10, 20, 30],
pager: '#jQGridDemoPager',
sortname: '_id',
viewrecords: true,
sortorder: 'desc',
caption: "List Employee Details",
editurl: 'Schedule.ashx?mOptometristId= ' + mOptometrist,
loadComplete: function () {
$("#jQGridDemo").setColProp('Day', { editoptions: { value: "1:Sunday;2:Monday;3:Tuesday"} });
}
});

Answer 1

You can use
url: "",
postData: {
mOptometristId: function () {
return $('#optOptometristList').val();
}
}
instead of
url: 'Schedule.ashx?mOptometristId=' + mOptometrist + ''
Inside of onchange event you need just call $("#jQGridDemo").trigger("reloadGrid");. See the answer for more details.