In running the following code in Shiny in R :
client_report_type = reactive({ input$report_type })
if ( is.element(client_report_type,"Enterprise_user"))
...
I encountered the following error message:
Error in match(el, set, 0L) : 'match' requires vector arguments
Does anyone know what does it mean, and how to resolve the problem? Thanks!
You don't need to put an input inside a reactive to get the value, but the input should be inside of a reactive expression. Anything outside a reactive expression will be execute only once when the shiny app starts. And if you try to use an input
value outside a reactive expression there will be an error. Depending of what you are going to do with input$report_type
you can put it in a reactive
(of course), observe
, or observeEvent
.
Here are some basic examples:
reactive:
dat <- reactive({
if ( is.element(input$report_type,"Enterprise_user")) {
...
myData
} else {
NULL
}
})
observe:
observe({
if (is.null(input$report_type))
return()
if ( is.element(input$report_type,"Enterprise_user"))
...
})
observeEvent:
observeEvent(input$report_type, {
if ( is.element(input$report_type,"Enterprise_user"))
...
})
Here is great tutorial about shiny and reactivity: http://deanattali.com/blog/building-shiny-apps-tutorial/#reactivity-101
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