• To: mathgroup at smc.vnet.net
• Subject: [mg122487] Re: PopupMenu Problems
• From: A Retey <awnl at gmx-topmail.de>
• Date: Sun, 30 Oct 2011 04:20:16 -0500 (EST)
• Delivered-to: l-mathgroup@mail-archive0.wolfram.com
• References: <j8gnvh\$5ig\$1@smc.vnet.net>

```Am 29.10.2011 13:27, schrieb Don:
> Below is the code for a simple PopupMenu
>
> The purpose is to present the user with a PopupMenu that
> gives two options:  "Linear" or "NonLinear".
>
> There are two problems with this code:
>
> (1) The word "Linear" (the default)  is suppose to show up in
> the window next to the right of the word " Function:".
> Right now, it's just left as a blank.  It was thought
> that setting the inital value of the variable "fnc1" to Linear
> would solve that problem.
>
> (2) After the user makes a choice by clicking on the down arrow and
> clicking on an option (Linear or NonLinear) the
> code should then "fall through" and Print "999" to show
> it is positioned to determine which option the user chose by
> executing the following Which function, but this never happens.
> The act of choosing an option by the user  should  result in executing the Which function and subsequent functions.
>
> How can this code be modified to fix those two problems?
>

Honestly I'm not sure what exactly you try to achieve, your description
is quite different from what one could guess from the code...

here is a minimal solution which does what you seem to describe:

linear\$FE[] := Print["run linear FE"]

nonLinear\$FE[] := Print["run nonlinear FE"]

master\$FE[] := DynamicModule[{fnc1 = "Linear"},
Dynamic[fnc1], {
"Linear" :> linear\$FE[],
"NonLinear" :> nonLinear\$FE[]
}
]
]

I think you should have a look at the various possibilities to construct
a gui that mathematica provides and choose the one most appropriate for
formatting. If the above is what you want you can start adding features,
e.g. the AutoAction -> True option, or more important the Method ->
"Queued" which is a good idea if your real (non)linear\$FE take some time
to evaluate. Only after that I'd start to care about formatting details...

hth,

albert

```

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