"" (empty space) in a length parameter

[k.ronniger]

Hello dear members of the Autodesk forum,

I'm using Revit 2021.1.6 and trying to create a multifunctional annotation for multiple air terminals. So far I've used calculated parameters with IF-THEN-ELSE functions. Now I am faced with the challenge that an empty field or no content should be output for a parameter with the type for the length if case "false" is outputed. As "". But "" is usable only in a text parameter and I need a space in a length parameter. I've tried outputting 0 in case of false and making 0 invisible, but I have no idea how that's supposed to work. Are there other options for this challenge?

Thanks in advance: Konrad

[barthbradley]

What about "OR" and/or "AND" conditional statements?  Maybe nested conditional statements? 

https://www.revitforum.org/node/1126

[ToanDN]

No you can't. Numeric parameters don't support blank value.

[barthbradley]

Can you explain - with examples - what it is that you are trying to do exactly? I've read your post a few times and I still don't get it, but I refuse to believe there's no way to get there - wherever "there" is.    

[k.ronniger]

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@barthbradley  schrieb:

Can you explain - with examples - what it is that you are trying to do exactly? I've read your post a few times and I still don't get it, but I refuse to believe there's no way to get there - wherever "there" is.    

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Hello @barthbradley,

now I got a new idea how I can probably solve the problem without using the " " property.

My aim is to create one anotation for 7 several air terminal families. So I created several labels for the specific families of the air terminals in one anotation familie and connected their property "visible" withe a parameter of visibility to switch on and of the several labels if the specific air terminal is labeled. But the labels are shown for all labels or for none. What can I do to associate each label with the air terminal it belongs to?

[ToanDN]

You cannot. You would need to create 7 tag types and choose which one to tag.

[k.ronniger]

Means that I create 7 tag types and after taging all air terminals I need to select the special typ by using throug mouse clicking on the typebrowser at the side in the modeling view?

[ToanDN · Accepted solution]

Yeah.

[k.ronniger]

Thanks. Not that the solution I strived but better than labeling with a textfield for every singel air terminal and editing it unique.