How to modify field values programatically before saving using saveAllEdits()

[yohyoung]

Hi, I am using SmartClient Version 11.0p build 2016-12-25 Enterprise edition.
I am looking for the way I change some values in a ListGrid before saving using saveAllEdits();
For example, I want to change a field say "Time_elapsed" in a ListGrid to some value which users don't provide/enter.

I have tried this in a save button. I have successfully saved. However, I found there are 2 RPC requests per 1 change which I think I am not doing it proper way.
Can anybody enlighten me with the proper way???
----------------------
click: function(){
var editrows = theListGrid.getAllEditRows();
if (editrows.length == 0 ) return;
for (i=0;i<editrows.length;i++) {
if (record != null ) {
record.time_elapsed = global_var.time_elapsed;
theListGrid.updateData(record);
}

}
theListGrid.saveAllEdits();
}
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[Isomorphic]

See the Grid Editing overview. You can use editValues to programmatically define changes that should be saved along with user changes.