Adding a drop down menu to a subvi as an intput terminal

[johnmountney]

Is it possible to add a drop down menu as an input to a subvi? For example, when using the "Build Waveform Function", when you pass your cursor over the block, a little finger appears that allows you to select which input you are passing to the block. This seems as though it should be straigh forward. My subvi contains a case structure with multiple states. I would like to be able to easily selct the functionaluty without having to go back and see which input value goes with which state. I would like to be able to just click and point to select the proper input.

[MrHappyAsthma]

Look into using a Ring Constant or a Enum Constant.

They are located on the Numeric Palatte. 

[crossrulz]

It is almost sounding like what you really want is a polymorphic VI.

[johnmountney]

Similar to a ploymorphic vi, but it is only a single vi with multiple functionailities, each of which is determined by a single input. I would like to be able select that input value from a drop down menu that will pass the appropriate value to the subvi.

[johnmountney]

This is the simplicity I am lookig for, but is it possible to make a ring constant a permenant input on a subvi. Currently, I have to create a new ring constant and connect it every time I place the subvi on the block diagram. I would like to be able to place the subvi in the block diagram with the ring constant already available.

[crossrulz]

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@johnmountney wrote:

This is the simplicity I am lookig for, but is it possible to make a ring constant a permenant input on a subvi. Currently, I have to create a new ring constant and connect it every time I place the subvi on the block diagram. I would like to be able to place the subvi in the block diagram with the ring constant already available.

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You can make a wrapper VI and put it in your function palette and make it as "Place VI Contents".

Or you could use scripting to create a plugin.

The Right-Click->Create Constant isn't that bad.  I normally just copy and paste or Control+Drag to do what you want.

[RavensFan]

Make sure to make that ring constant terminal as "Required".