Deleting subfields

[rutledj]

I have a need to remove all of the subfields past the 9th one in the OBR-28 segment.

Tried this but it doesn't work. It says the length of OBR-28 == 1 but there are move subfields that that

logger.info('obr ' + msg['OBR'].length().toString());
logger.info('28 length: ' + msg['OBR'][0]['OBR.28'].length().toString());

for (var i = msg['OBR'].length()-1;i>0;i++)
{
     for (var j = msg.children()[i]['OBR.28'].length() -1; j>9;j--)
     {
 
          delete msg.children()[i]['OBR.28'][j];
     }
}

message contains 1 obr :

OBR|1|725885585^HNAM_ORDERID|850612^EPIC_Filler_Or der_Id|006127^Lytes|||20210331101552|||||||2021033 1101500|&Blood|||||000002021090000005^HNA_ACCN~111 86305^HNA_ACCNID||20210331101710|||C||1^^^20210331 101300^^S|1740387760^VOINESCU^CATALINA^GENTIANA^^M D^MD^^NPI^Personnel^^^External Identifier

I need to remove everything past the OBR-28.9 (after 'NPI')

[upstart33]

I don't think you can delete segments like that. Why don't you just specifically set those segments to empty spaces if you need to always 'remove' them.

[rutledj]

I won't always know how many I actually have

[agermano]

There is only 1 OBR.28, because it is not repeating. You want to delete components (children) of OBR.28.

This should work

for each (var obr28 in msg.OBR['OBR.28']) {
    var first9 = new XMLList();
    for (var i = 1; i <= 9 ; i++) {
        first9 += obr28['OBR.28.'+i];
    }
    obr28.setChildren(first9);
}

I accessed the children by name rather than index because it is possible that there are gaps depending on how the message was created. A node that doesn't exist will be omitted from the final result as well (resulting in fewer than 9 children, but still the output that you need.)

[agermano]

This effectively does the same thing if you just want to list them individually rather than building the list in a loop.

for each (var obr28 in msg.OBR['OBR.28']) {
    obr28.setChildren(<>
        {obr28['OBR.28.1']}
        {obr28['OBR.28.2']}
        {obr28['OBR.28.3']}
        {obr28['OBR.28.4']}
        {obr28['OBR.28.5']}
        {obr28['OBR.28.6']}
        {obr28['OBR.28.7']}
        {obr28['OBR.28.8']}
        {obr28['OBR.28.9']}
    </>);
}

[jkrebs]

The below might be an option also:

function trimField(segmentField, endComponent) {
  var component = segmentField.name() + '.'
  for (var idx = segmentField.children().length(); idx > endComponent; idx--)
    delete segmentField[component + idx]
}
trimField(msg.OBR['OBR.28'], 9)

Just include the indexes and it should scale for repeating segments/fields.