You might consider just using transclusion or macros rather than store 
duplicative information. 

You can then just use something like {{!!firstname}} {{!!lastname}} or 
<<fullname>> where you need to.

You might be able to do what you want to do by hooking action widgets into 
a separate button or the system/tiddler save button but it might end up 
being an awkward and error-prone way of doing things.

/Mike

On Saturday, February 20, 2021 at 12:51:05 AM UTC-4 switchplayer wrote:

> Hello, 
>
> I am wanting to find a way to have a field populated/updated each time I 
> save the tiddler. This field should take values from two other fields. 
>
> Simple example:
>
> (Field 1) First Name: DA
> (Field 2) Last Name: Carson
>
> (Field 3) Full Name: DA Carson
>
>
> I want Field 3 to be populated with the values from Field 1 and Field 2 
> each time the tiddler is saved.
>
> Definitely appreciate any input here...still a newbie with TiddlyWiki!
>
>
>
>
>

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