shiny selectInput question

[Runner923]

I have a shiny app that reads a csv file containing stock quotes and plots the tick data by stock symbol. I select the stock symbol from a list. I would like prefer to select the stock symbol for that column csv file after I have selected and read the csv into the app. I haven't been able to figure out how to populate the stock symbol list in this way. I am sure there's something I'm misunderstanding about ui/server functions and reactivity.

[sckott]

good idea @Runner923 :)

we'll put this on the list for things to discuss at aggregate this week