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MathGroup Archive 2008

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Initialization of a dynamic module

  • To: mathgroup at smc.vnet.net
  • Subject: [mg89869] Initialization of a dynamic module
  • From: Hannes Kessler <HannesKessler at hushmail.com>
  • Date: Mon, 23 Jun 2008 02:48:10 -0400 (EDT)

Hello,

I have a problem with an incorrect context and context path after
loading a dynamic module initialized with Needs.
Consider the following example:

1. Execute the code given below in a fresh notebook. The dynamic
elements work as expected.
2. Save and re-open the notebook. The dynamic elements still work as
expected.

However, a check of $ContextPath and $Context gives {"Units`",
"System`"} and Units`.
The Global` context disappeared, and new symbols will be created in
the Units` context.

Here is the code:

Needs["Units`"];
DynamicModule[{a = 10 Newton},
 {
  PopupMenu[Dynamic  @  a, {10 Newton, 20 Newton}],
  Refresh[Dynamic  @  a, TrackedSymbols -> {a}],
  Context  @  Newton
  },
 Initialization :> Needs["Units`"]]

How the dynamic module has to be modified in order to recover a normal
state with Global` set as current context and being part of the
context path after initialization?

Best regards,
Hannes Kessler


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