Question

How to add row after gridunload/gridReload and then appear row with empty data?

Answer 1

To add new empty row in the grid after loading/reloading you can call addRowData inside of loadComplete. Because we need get an unique id for the new row I suggest to use $.jgrid.randId() introduced in 4.0.0 version of jqGrid. So the code can looks like the following

$('#list').jqGrid({
    ...
    loadComplete: function() {
        // we can include some default value
        // in the case the value will be { colName: "my default value" }
        var newRowData = {},
            newRowId = $.jgrid.randId(),
            myGrid = $(this);

        myGrid.jqGrid('addRowData', newRowId, newRowData);
        myGrid.jqGrid('setSelection', newRowId);  // select new row
        myGrid.jqGrid('editRow', newRowId, true); // editing the row
    }
});

In the above example I selected additionally new added row and then started the editing of the row with respect of inline editing. There lines are just examples for some actions which you can additionally do with the new empty row.