hello everyone,
I want to select all of the specific family in a level. Please correct me.
thanks
your mask must have a booleen as input
true or fals
Get the family type from your elements from the AllElementsAtLevel node, then get the ID from the resulting family type. Then get the ID of the family type in your drop down. Ask if the ID from the drop down is the same as the ID of the instance types with an == node. The resulting true/false values are your mask.
^ that, but I used Element IDs instead of names.
Good job. 
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thanks for your reply. But where i find list.equals node. And i am getting the following error.
Warning: Elements.Type operation failed.
The call is ambiguous between the following methods or properties: âRevit.Elements.ElementWrapper.Wrap(Autodesk.Revit.DB.CurtainSystem, bool)â and 'Revit.Elements.ElementWrapper.Wrap(Autodesk.Revit.DB.FamilyInstance, bool)
thanks
Element.name not Element.Type
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ok . where i will find list.equal node?
it can help you
https://dictionary.dynamobim.com/#/BuiltIn/Action/Equals
Equals in the wish list
if not:
== should also work.
totally not getting this:
I am using the sample project.
HVAC_E.rvt
using == i get 3 out of 41 devices on that level.
using list.equals i get⌠pretty much nothing? (see pic)
also tried Jacobâs Variant, still does not work.
I also tried getting the IDs and i tried using list intersect but it was always empty so i exported the ID lists to excel and they were differentâŚ
The âAll Elements at Levelâ node will give you instances.
You have to turn them into Types (âElement.ElementTypeâ node) before you can compare them with other Types.
thank you for the suggestion but that didnât work either.
for == it says Dereferencing a non pointer.
I think this approach was made by Jacob higher up.
you can see the results in the attached pic.
*should find 41 devices at 2. floor.
I managed to get it to find the 41 elements but i cannot post more than 1 pic.
I got it by using a âhelperâ text parameter - i used a specific value for that parameter at level 2 (select all devices in view and set the parameter) and that is how i got around the issue.
Not all elements have Element.Types (example: ModelCurve outputs null, which triggers the âdereferencing a non-pointerâ warning).
I recommend using Jacobâs method of Element.Id instead of Element.Name. ID is unique, Name is not (Too many âStandardâ type names, for instanceâŚ)
Hi, I tried using the exact thing Jacob posted, still did not work.
When i saw IDs i was sure it will be a breeze. For some reason it did not work 
This may be a silly double-check, but worth verifying:
All Elements at Level uses the Reference Level as the collection methodâŚis there any chance your other 38 fixtures are either using a non-relevant Reference Level or have lost their hosting? This could occur if the fixtures are copied in non-typical methods, if linked model associations are broken, etcâŚ
A quick way to diagnose is to find the 3 fixtures that were properly collected, then go find a fixture that isnât one of the 3 but should have shown up. Start querying the properties.
If either of these are the case, and for some reason you are not able to fix the model relationships, you may need to do an elevation-based filtering method instead.
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oh. my. God.
just checked and boy, was I in for a surprise: âjustâ those 3 sockets it found?
Turns out they were the only ones having as host the level i was looking at!!
The other ones (totalling 41! ) had as host cable tray, and were not constrained to level â2. floorâ.
I take all âit does not workâ words back, I am sorry! I am a Noob i will lay low with the âdoes not workâ and try harder to investigateâŚ)
I am working on the sample revit project so i expected it all to be as i was imaginig it⌠WRONG!!!
managed to easily get all 44 using select model elements and boolean filter by category name 
canât add more than 1 pic though.
