Set Integer Parameter as Null

Revit
1

Is it possible to make an integer parameter blank by setting it as null?

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image1136×540 117 KB

2

Have a look at this thread: Reset / Set Parameter to Empty / Blank / Null - #15 by sovitek

1 Like
3

I’m just getting Null

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image1270×548 105 KB

4

Open the custom node, copy the contents, switch back to the main workspace and paste them into it. Wire them up and see if you get a meaningful error.

5

I had to convert it to Cpython but i get an error on line 26

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image802×466 68.5 KB

# Copyright(c) 2018, Dimitar Venkov
# @5devene, dimitar.ven@gmail.com
# www.badmonkeys.net

import clr

clr.AddReference('RevitAPI')
from Autodesk.Revit.DB import ElementId

clr.AddReference('RevitServices')
from RevitServices.Persistence import DocumentManager
from RevitServices.Transactions import TransactionManager
doc = DocumentManager.Instance.CurrentDBDocument

def tolist(x):
        if hasattr(x,'__iter__'): return x
        else : return [x]

inv = ElementId.InvalidElementId

items = tolist(IN[0])
param = IN[1]
OUT = []

TransactionManager.Instance.EnsureInTransaction(doc)
for i in items:
        itm = None
        par = i.InternalElement.LookupParameter(param)
        if par is not None:
                try:
                        par.Set(inv)
                        itm = i
                except:
                        pass
        OUT.append(itm)
TransactionManager.Instance.TransactionTaskDone()
6

Can’t help without you showing the error, but if I had to guess it expects a list of elements, you are providing a single element.