This example demonstrates a core feature of Shiny: reactivity. In the server
function, a reactive called datasetInput
is declared.
Notice that the reactive expression depends on the input expression input$dataset
, and that it's used by two output expressions: output$summary
and output$view
. Try changing the dataset (using Choose a dataset) while looking at the reactive and then at the outputs; you will see first the reactive and then its dependencies flash.
Notice also that the reactive expression doesn't just update whenever anything changes--only the inputs it depends on will trigger an update. Change the "Caption" field and notice how only the output$caption
expression is re-evaluated; the reactive and its dependents are left alone.
Any scripts or data that you put into this service are public.
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