JqGrid not always passing hidden parameters - jqgrid

Question

When I'm trying to save all rows from jqGrid table, hidden parameters are not always passed to controller. For example when I have 20 rows to save, 3 are without hidden parameters and the rest 17 are ok. I have 4.8.0 version of jqGrid. My question is if it is something wrong in my code or just some error in jqGrid
$.each($(gridObject.TableId).jqGrid('getDataIDs'), function (i, val) {
$(gridObject.TableId).jqGrid('editRow', val, true);
$(gridObject.TableId).saveRow(val, undefined, gridObject.ControllerAddress + 'Edit', undefined);
});
Wrong passed parameters
Correct passed parameters
Table definition:
$(gridObject.TableId).jqGrid({
url: gridObject.ControllerAddress + 'Get',
postData:
{
forSessionId: gridObject.PostData.ForSessionId,
pepper: Math.random()
},
colNames: ['Participant',
'Attended <input type="checkbox" id="allAttended" />',
'Passed <input type="checkbox" id="allPassed" />',
'Id', 'UserId', 'SessionId'],
colModel: [
// displayed always
{ name: 'ParticipantName' },
{
name: 'Attended', sortable: false, edittype: 'checkbox', formatter: 'checkbox', formatoptions: { disabled: false },editable: true,
editoptions: {
value: GridsDictionaries.Checkbox.Default.value,
dataEvents: [{
type: 'change', fn: function (e) {
if ($(this).prop('checked')==false) {
var passedCheckbox = $(this).closest('tr').find('td[aria-describedby=participations_table_Passed] input[type=checkbox]');
$(passedCheckbox).removeProp('checked');
}
}
}]
}
},
{
name: 'Passed', sortable: false, edittype: 'checkbox', formatter: 'checkbox', formatoptions: { disabled: false }, editable: true,
editoptions: {
value: GridsDictionaries.Checkbox.Default.value,
dataEvents: [{
type: 'change', fn: function (e) {
if ($(this).prop('checked')) {
var attendedCheckbox = $(this).closest('tr').find('td[aria-describedby=participations_table_Attended] input[type=checkbox]');
$(attendedCheckbox).prop('checked', true);
}
}
}]
}
},
// hidden
{ name: 'Id', hidden: true, key: true },
{ name: 'ParticipantId', hidden: true, editable: true },
{ name: 'SessionId', hidden: true, editable: true },
],
autowidth: true,
pager: "",
caption: "List of participants",
//ondblClickRow: gridObject.ToggleEdition, onPaging: gridObject.OnPaging,
loadComplete: function () {
$.each($(gridObject.TableId).jqGrid('getDataIDs'), function (i, val) {
$(gridObject.TableId).jqGrid('editRow', val, true);
$(gridObject.TableId + ' tr#' + val).unbind('keydown');
});
},
});

Answer 1

This is not a error in the code, but feature. As of the creation of jqGrid the hidden fields are not editable and its values are not posted a to the server (local data).
I highly recommend you to discover the documentation of Guriddo jqGrid.
In the link above is explained how to edit these fields.