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This question was inspired by yode's question found here. I think yode asked the wrong question, so I am asking what I think is the right one.

Consider a situation in which the user has to choose two directories before a computation can move forward. We want to present the user with two file-name setters but have the code wait until the user has chosen one directory from each setter before proceeding. How can we do that?

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  • $\begingroup$ If you have time, could you please check this for grammar and clarity? $\endgroup$ – Szabolcs Apr 5 '17 at 11:35
  • $\begingroup$ @Szabolcs. I didn't find anything wrong with the grammar, but I have made what I hope is a clarification. Do you think it clear now? $\endgroup$ – m_goldberg Apr 7 '17 at 1:39
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Update

My answer is to use Dynamic with the option UpdateInterval -> 1 to hold the code that checks the completion condition.

DynamicModule[{from, to},
  Column[
   {Dynamic @
      Row[
        {FileNameSetter[Dynamic[from], "Directory", Appearance -> "From where"],
         FileNameSetter[Dynamic[to], "Directory", Appearance -> "To where"],
         Button["Reset", Clear[from, to]]}],
    Dynamic[
      If[And @@ {ValueQ[from], ValueQ[to]}, 
        StringJoin[{from, "  ", to}], "Waiting ..."],
      UpdateInterval -> 1]}]]

Before the condition is fulfilled, the user sees

before

After the condition is fulfilled, the user sees

after

The Reset button lets the code be reused to pick another pair of directories.

| improve this answer | |
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  • $\begingroup$ Thanks.Good workaround,I think the Column save me. :) $\endgroup$ – yode Dec 23 '16 at 6:22

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