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Re: about the use of button

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  • Subject: [mg115051] Re: about the use of button
  • From: John Fultz <jfultz at>
  • Date: Wed, 29 Dec 2010 05:59:26 -0500 (EST)

Evaluating Dynamic does not perform its action.  Only displaying the output of
Dynamic does that, but Button never displays its action.

Note that the documentation for Button has numerous examples which demonstrate
many of its usages.  Several of the examples point to the right way to do this
by using CompoundExpression...i.e., a semicolon-delimited expression.

Button[label, action1;action2]


John Fultz
jfultz at
User Interface Group
Wolfram Research, Inc.

On Tue, 28 Dec 2010 06:51:17 -0500 (EST), yang wrote:
> Hello, I'm a novice in Mathematica, now got a little puzzeled:
> I'm intend to create a button which take two actions while clicked:
> Button["A person enters",
> {Dynamic[car_weight+==60],Dynamic[person_number++}]]
> seems that this sentence won't work properly,
> There must be some error with the grammar, right?

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