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Loops in Precondition

Lauren_Froschauer
Lauren_Froschauer Member Posts: 10 EDU
in FeatureScript
Emily and I are trying to implement a variable amount of inputs in the precondition. 
We are trying to generate N amount of input boxes in the feature dialog that is based on the number N entered by the user in another dialog box. 
We have tried a for loop, and discovered that this is not possible. We get the error " nonconforming precondition: unexpected statement type (loop). 

Is there a way to have N boxes generated? Or a way for a user to input an array of values into one dialog box? 

Comments

  • dave_cowden
    dave_cowden Member, Developers Posts: 484 ✭✭✭
    Yeah, pretty sure you can't do that-- preconditions have to be predicates-- no loops are allowed.

    If you are writing a feature, you could try using the 'editing logic function', though, in which you can do arbitrary logic. You do that like this:

    annotation { "Feature Type Name" : "Your Feature" , "Editing Logic Function" : "yourEditLogicFunction" }

    Your function needs to be declared like this:

    export function yourEditLogicFunction(context is Context, id is Id, oldDefinition is map, definition is map,
                                  isCreating is boolean, specifiedParameters is map, hiddenBodies is Query) returns map { ... }

    It will be called whenever your feature inputs are edited, and there you can pretty much do whatever. 

    I used this approach as a work-around when I was needing to dynamically manipulate the inputs.

    HTH

  • john_f_carr
    john_f_carr Onshape Employees Posts: 74 image
    As far as the FeatureScript language is concerned preconditions can have loops, but preconditions with loops will not be recognized as feature specifications.
  • jacob_kingery
    jacob_kingery Member Posts: 39 EDU
    I'm also curious about this. What's the best way to allow the user to input N lengths, for example?
  • ilya_baran
    ilya_baran Onshape Employees, Developers, HDM Posts: 1,273 image
    There currently is no good way to do this.  You can't even condition visibility based on something other than an enum or a boolean.  You can imagine hacking hidden booleans set with editing logic, but that will not be a great user experience since round trips to the server will be required.  We intend to improve on this in the future.
    Ilya Baran \ VP, Architecture and FeatureScript \ Onshape Inc
  • darren_13
    darren_13 Member, Developers Posts: 120 PRO
    I'm also interested this, I need to define like 4 identical parameters 'n' number of times. Might use the above-described method by @dave_cowden. David could I somehow have an enum from say 1-5 and edit the properties for each enum individually? so I change the parameters for '1' then move onto setting up the parameters for '2'? 

    Thanks in advance,
    Darren

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