We have two action buttons. When we click a button, we wish to generate a new plot.
However, dependencies within reactive
function are constructed dynamically as the
code is run. In the case below, because input$unif
is not executed, then it is not
included as a dependency.
actionButton("norm", "Normal") actionButton("unif", "Uniform") ## Reactive dependencies are dynamic rv1 = reactive({ if(input$norm) { rnorm(100) } else if(input$unif){ runif(100) } else { rnorm(100) } }) renderPlot(plot(rv1()))
Combine reactiveValues
and observeEvents
.
* reactiveValues
creates a list of reactive values that you can update in your code
* You can update the reactive values from inside a call to
rv2 = reactiveValues(data = rnorm(100)) observeEvent(input$norm, {rv2$data = rnorm(100)}) observeEvent(input$unif, {rv2$data = runif(100)}) renderPlot({plot(rv2$data)})
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